From 1896cf783e5adc300ad745911f8c6e5e98b0830b Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Mon, 21 Jan 2019 16:18:00 +0300
Subject: [PATCH 01/59] prod: add bandwidthEstimate method

---
 src/hls.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/hls.js b/src/hls.js
index 6ea973996e7..6b0a3fe28b1 100644
--- a/src/hls.js
+++ b/src/hls.js
@@ -616,4 +616,14 @@ export default class Hls extends Observer {
       subtitleTrackController.subtitleDisplay = value;
     }
   }
+
+  /**
+   * get bandwidth estimate
+   * @type {number}
+   */
+  get bandwidthEstimate () {
+    const hls = this;
+    const bwEstimator = hls.abrController._bwEstimator;
+    return bwEstimator ? bwEstimator.getEstimate() : NaN;
+  }
 }

From 16685b3c04f928ec8417f0b239a387b1a50e61b4 Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Mon, 21 Jan 2019 16:29:15 +0300
Subject: [PATCH 02/59] docs: add bandwidthEstimate

---
 docs/API.md |  7 +++++++
 src/hls.js  | 20 ++++++++++----------
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/docs/API.md b/docs/API.md
index 69b018ceb2c..e897e5dcbe2 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -89,6 +89,7 @@
   - [`hls.startLevel`](#hlsstartlevel)
   - [`hls.autoLevelEnabled`](#hlsautolevelenabled)
   - [`hls.autoLevelCapping`](#hlsautolevelcapping)
+  - [`hls.bandwidthEstimate`](#bandwidthestimate)
 - [Version Control](#version-control)
   - [`Hls.version`](#hlsversion)
 - [Network Loading Control API](#network-loading-control-api)
@@ -1053,6 +1054,12 @@ Default value is `hls.firstLevel`.
 
 Default value is `-1` (no level capping).
 
+### `hls.bandwidthEstimate`
+
+- get: Return bandwidth estimate.
+  - if estimator is available: current bandwidth
+  - if `NaN`: estimator is not available
+
 ## Version Control
 
 ### `Hls.version`
diff --git a/src/hls.js b/src/hls.js
index 6b0a3fe28b1..cc75a47179f 100644
--- a/src/hls.js
+++ b/src/hls.js
@@ -453,6 +453,16 @@ export default class Hls extends Observer {
     return this._autoLevelCapping;
   }
 
+  /**
+   * get bandwidth estimate
+   * @type {number}
+   */
+  get bandwidthEstimate () {
+    const hls = this;
+    const bwEstimator = hls.abrController._bwEstimator;
+    return bwEstimator ? bwEstimator.getEstimate() : NaN;
+  }
+
   /**
    * Capping/max level value that should be used by automatic level selection algorithm (`ABRController`)
    * @type {number}
@@ -616,14 +626,4 @@ export default class Hls extends Observer {
       subtitleTrackController.subtitleDisplay = value;
     }
   }
-
-  /**
-   * get bandwidth estimate
-   * @type {number}
-   */
-  get bandwidthEstimate () {
-    const hls = this;
-    const bwEstimator = hls.abrController._bwEstimator;
-    return bwEstimator ? bwEstimator.getEstimate() : NaN;
-  }
 }

From c4e802ce36f26c212e8acb7ddc3cc9f5eb968a5e Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Mon, 21 Jan 2019 16:51:19 +0300
Subject: [PATCH 03/59] test: add autotest

---
 tests/unit/hls.js | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 tests/unit/hls.js

diff --git a/tests/unit/hls.js b/tests/unit/hls.js
new file mode 100644
index 00000000000..62953000d9e
--- /dev/null
+++ b/tests/unit/hls.js
@@ -0,0 +1,18 @@
+import Hls from '../../src/hls';
+
+const assert = require('assert');
+
+describe('Hls', () => {
+  it('should return bandwidth estimate', () => {
+    let hls = new Hls({ maxStarvationDelay: 4 });
+    hls.levelController._levels = [
+      { bitrate: 105000, name: '144', details: { totalduration: 4, fragments: [{}] } },
+      { bitrate: 246440, name: '240', details: { totalduration: 10, fragments: [ {} ] } },
+      { bitrate: 460560, name: '380', details: { totalduration: 10, fragments: [ {} ] } },
+      { bitrate: 836280, name: '480', details: { totalduration: 10, fragments: [ {} ] } },
+      { bitrate: 2149280, name: '720', details: { totalduration: 10, fragments: [ {} ] } },
+      { bitrate: 6221600, name: '1080', details: { totalduration: 10, fragments: [ {} ] } }
+    ];
+    assert.equal(isNaN(hls.bandwidthEstimate), true);
+  });
+});

From ea3e1f07755bc33ab1de168e640ae0e4f94f1bca Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Wed, 9 Jan 2019 16:27:29 -0400
Subject: [PATCH 04/59] Convert buffer-controller.js to TypeScript

Thank you to Tom Jenkinson for acting as a reviewer for this work, including writing some suggestions via the GitHub PR github.com/video-dev/hls.js/pull/2073. The commit history has been squashed as it was a fairly lengthly process to get everything working to support the conversion to TypeScript.

Early in the history of this commit, we converted properties to be initialized to `null`. This was incorrect, as it changes the behaviour of code that uses `Object.keys` calls to check if an object has any keys on it. Before, they would be empty, but if the properties are set to null, this check is no longer valid and it changes the behaviour. This is something to look out for in the future of other conversions, as the values themselves are often times reset to the `null`, but begin as undefined.

Added a common `types` folder for interfaces where the ownership of the type wasn't clear for the individual file. The default no-op logger which is the inferred usage did not have any arguments in it's method signature. By adding an argument, TypeScript is able to infer the correct interface. As well the Karma and Webpack configuration had to be updated to enable building TypeScript, and getting testing coverage information from Istanbul.

Define lib "es2015" and "dom" to add HTMLMediaElement, SourceBuffer and Number.isFinite definitions to the TypeScript binary when it is doing type-checking.

When attempting to lint the older version of `typescript-eslint-parser` would emit `no-undef` errors for TypeScript interfaces. Updating the package fixes this issue.

Tom pointed out that we should not use global module declarations to extend default HTML types since users will eventually be importing *.d.ts files from the hls.js project and this would also extend their types. Due to this feedback switched to defining a module local type `ExtendedSourceBuffer`. Which instead extends with the `ended` prop.

Event Handlers were set to be part of the private scope. While this has no effect now, it will be important to ensure other modules do not directly invoke the event handlers. Other methods that were prefixed with a `_` were also set into the private scope.

Where possible, code was switched to early-exit to lower the cognitive load in conditional statements, an example of this was the doAppend method. Another cleanup statement was switching handling of error codes and the comments to be closer to the conditional to which they applied.

Switched to using the Record<Key, Value> type to help support access via the index signature [key: T] syntax in the future.

An issue that was fixed in this commit was that The controller previous exposed the local `pendingTracks` property through the event and did not set the buffer on `this.tracks` instead opting to set it on the individual track, which bubbled up to the pendingTracks object, whose reference was lost in the buffer-controller module. This commit changes this behaviour so that the controller publishes `tracks` from the public variable on the controller rather than the pendingTracks which are passed into createSourceBuffers. This also means that this fixes the `.buffer.buffered` being undefined on the demo page. Added unit tests to cover the new behaviour of throwing an error if createSourceBuffer is called without an attached media element.
---
 karma.conf.js                                 | 129 +++--
 package-lock.json                             |  29 +-
 package.json                                  |   2 +-
 ...fer-controller.js => buffer-controller.ts} | 515 ++++++++++--------
 src/types/segment.ts                          |   6 +
 src/types/track.ts                            |  20 +
 src/utils/logger.js                           |   2 +-
 tests/unit/controller/buffer-controller.js    |  34 +-
 tsconfig.json                                 |  14 +-
 9 files changed, 462 insertions(+), 289 deletions(-)
 rename src/controller/{buffer-controller.js => buffer-controller.ts} (55%)
 create mode 100644 src/types/segment.ts
 create mode 100644 src/types/track.ts

diff --git a/karma.conf.js b/karma.conf.js
index 321d576a056..6b0940eed1c 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -6,56 +6,65 @@ const webpack = require('webpack');
 const path = require('path');
 
 module.exports = function(config) {
-	config.set({
-		// base path that will be used to resolve all patterns (eg. files, exclude)
-		basePath: '',
+  config.set({
+    // base path that will be used to resolve all patterns (eg. files, exclude)
+    basePath: '',
 
-		// frameworks to use
-		// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-		frameworks: ['mocha', 'sinon', 'should'],
+    // frameworks to use
+    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
+    frameworks: ['mocha', 'sinon', 'should'],
 
-		// list of files / patterns to load in the browser
-		files: [
+    // list of files / patterns to load in the browser
+    files: [
       'tests/unit/**/*.js'
     ],
 
-		// list of files to exclude
-		exclude: [],
+    // list of files to exclude
+    exclude: [],
 
-		// preprocess matching files before serving them to the browser
-		// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
-		preprocessors: {
-		  '**/*.js': ['webpack', 'sourcemap']
-		},
+    // preprocess matching files before serving them to the browser
+    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
+    preprocessors: {
+      'tests/**/*.js': ['webpack', 'sourcemap']
+    },
 
-		// test results reporter to use
-		// possible values: 'dots', 'progress'
-		// available reporters: https://npmjs.org/browse/keyword/karma-reporter
-		reporters: ['mocha', 'coverage-istanbul'],
+    // test results reporter to use
+    // possible values: 'dots', 'progress'
+    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
+    reporters: ['mocha', 'coverage-istanbul'],
 
-		coverageIstanbulReporter: {
-			reports: ['lcov', 'text-summary'],
-			fixWebpackSourcePaths: true
-		},
+    coverageIstanbulReporter: {
+      reports: ['lcov', 'text-summary'],
+      fixWebpackSourcePaths: true
+    },
 
-		webpack: {
+    webpack: {
       mode: 'development',
-			devtool: 'inline-source-map',
-			module: {
-				rules: [
-					// instrument only testing sources with Istanbul
-					{
-						test: /\.js$/,
-						include: path.resolve('src/'),
-						exclude: path.resolve(__dirname, 'node_modules'),
-						use: [
-							{
-								loader: 'istanbul-instrumenter-loader',
-								options: { esModules: true }
-							}
-						]
-					}
-				]
+      devtool: 'inline-source-map',
+      resolve: {
+        extensions: ['.ts', '.js']
+      },
+      module: {
+        rules: [
+          {
+            test: /\.(ts|js)$/,
+            include: path.resolve(__dirname, 'src'),
+            exclude: path.resolve(__dirname, 'node_modules'),
+            loader: 'ts-loader'
+          },
+          // instrument only testing sources with Istanbul
+          {
+            test: /\.(ts|js)$/,
+            exclude: path.resolve(__dirname, 'node_modules'),
+            enforce: 'post',
+            use: [
+              {
+                loader: 'istanbul-instrumenter-loader',
+                options: { esModules: true }
+              }
+            ]
+          }
+        ]
       },
       plugins: [
         new webpack.DefinePlugin({
@@ -65,31 +74,31 @@ module.exports = function(config) {
           __USE_EME_DRM__: JSON.stringify(true)
         })
       ]
-		},
+    },
 
-		// web server port
-		port: 9876,
+    // web server port
+    port: 9876,
 
-		// enable / disable colors in the output (reporters and logs)
-		colors: true,
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
 
-		// level of logging
-		// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
-		logLevel: config.LOG_INFO,
+    // level of logging
+    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+    logLevel: config.LOG_INFO,
 
-		// enable / disable watching file and executing tests whenever any file changes
-		autoWatch: false,
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: false,
 
-		// start these browsers
-		// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-		browsers: ['ChromeHeadless'],
+    // start these browsers
+    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
+    browsers: ['ChromeHeadless'],
 
-		// Continuous Integration mode
-		// if true, Karma captures browsers, runs the tests and exits
-		singleRun: true,
+    // Continuous Integration mode
+    // if true, Karma captures browsers, runs the tests and exits
+    singleRun: true,
 
-		// Concurrency level
-		// how many browser should be started simultaneous
-		concurrency: Infinity
-	});
+    // Concurrency level
+    // how many browser should be started simultaneous
+    concurrency: Infinity
+  });
 };
diff --git a/package-lock.json b/package-lock.json
index 9ef1af29eac..6df348cc3d4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13130,9 +13130,32 @@
       "dev": true
     },
     "typescript-eslint-parser": {
-      "version": "16.0.1",
-      "resolved": "https://registry.npmjs.org/typescript-eslint-parser/-/typescript-eslint-parser-16.0.1.tgz",
-      "integrity": "sha512-IKawLTu4A2xN3aN/cPLxvZ0bhxZHILGDKTZWvWNJ3sLNhJ3PjfMEDQmR2VMpdRPrmWOadgWXRwjLBzSA8AGsaQ==",
+      "version": "21.0.2",
+      "resolved": "https://registry.npmjs.org/typescript-eslint-parser/-/typescript-eslint-parser-21.0.2.tgz",
+      "integrity": "sha512-u+pj4RVJBr4eTzj0n5npoXD/oRthvfUCjSKndhNI714MG0mQq2DJw5WP7qmonRNIFgmZuvdDOH3BHm9iOjIAfg==",
+      "dev": true,
+      "requires": {
+        "eslint-scope": "^4.0.0",
+        "eslint-visitor-keys": "^1.0.0",
+        "typescript-estree": "5.3.0"
+      },
+      "dependencies": {
+        "eslint-scope": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.0.tgz",
+          "integrity": "sha512-1G6UTDi7Jc1ELFwnR58HV4fK9OQK4S6N985f166xqXxpjU6plxFISJa2Ba9KCQuFa8RCnj/lSFJbHo7UFDBnUA==",
+          "dev": true,
+          "requires": {
+            "esrecurse": "^4.1.0",
+            "estraverse": "^4.1.1"
+          }
+        }
+      }
+    },
+    "typescript-estree": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/typescript-estree/-/typescript-estree-5.3.0.tgz",
+      "integrity": "sha512-Vu0KmYdSCkpae+J48wsFC1ti19Hq3Wi/lODUaE+uesc3gzqhWbZ5itWbsjylLVbjNW4K41RqDzSfnaYNbmEiMQ==",
       "dev": true,
       "requires": {
         "lodash.unescape": "4.0.1",
diff --git a/package.json b/package.json
index 7d33718ad3b..2b0a4de6202 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,7 @@
     "ts-loader": "^4.4.2",
     "ts-node": "^6.1.0",
     "typescript": "^2.9.1",
-    "typescript-eslint-parser": "^16.0.0",
+    "typescript-eslint-parser": "^21.0.2",
     "webpack": "^4.11.1",
     "webpack-bundle-analyzer": "^2.9.1",
     "webpack-cli": "^3.0.2",
diff --git a/src/controller/buffer-controller.js b/src/controller/buffer-controller.ts
similarity index 55%
rename from src/controller/buffer-controller.js
rename to src/controller/buffer-controller.ts
index eb6b006faa1..a5eb9c5c8bc 100644
--- a/src/controller/buffer-controller.js
+++ b/src/controller/buffer-controller.ts
@@ -1,55 +1,100 @@
 /*
  * Buffer Controller
-*/
+ */
 
-import Event from '../events';
+import Events from '../events';
 import EventHandler from '../event-handler';
 import { logger } from '../utils/logger';
 import { ErrorTypes, ErrorDetails } from '../errors';
 import { getMediaSource } from '../utils/mediasource-helper';
 
+import { TrackSet } from '../types/track';
+import { Segment } from '../types/segment';
+
+// Add extension properties to SourceBuffers from the DOM API.
+type ExtendedSourceBuffer = SourceBuffer & {
+  ended?: boolean
+};
+
+type SourceBufferName = 'video' | 'audio';
+type SourceBuffers = Partial<Record<SourceBufferName, ExtendedSourceBuffer>>;
+
+interface SourceBufferFlushRange {
+  start: number;
+  end: number;
+  type: SourceBufferName
+}
+
 const MediaSource = getMediaSource();
 
 class BufferController extends EventHandler {
-  constructor (hls) {
+  // the value that we have set mediasource.duration to
+  // (the actual duration may be tweaked slighly by the browser)
+  private _msDuration: number | null = null;
+  // the value that we want to set mediaSource.duration to
+  private _levelDuration: number | null = null;
+  // the target duration of the current media playlist
+  private _levelTargetDuration: number = 10;
+  // current stream state: true - for live broadcast, false - for VoD content
+  private _live: boolean | null = null;
+  // cache the self generated object url to detect hijack of video tag
+  private _objectUrl: string | null = null;
+
+  // signals that the sourceBuffers need to be flushed
+  private _needsFlush: boolean = false;
+
+  // signals that mediaSource should have endOfStream called
+  private _needsEos: boolean = false;
+
+  // this is optional because this property is removed from the class sometimes
+  public audioTimestampOffset?: number;
+
+  // The number of BUFFER_CODEC events received before any sourceBuffers are created
+  public bufferCodecEventsExpected: number = 0;
+
+  // A reference to the attached media element
+  public media: HTMLMediaElement | null = null;
+
+  // A reference to the active media source
+  public mediaSource: MediaSource | null = null;
+
+  // List of pending segments to be appended to source buffer
+  public segments: Segment[] = [];
+
+  public parent?: string;
+
+  // A guard to see if we are currently appending to the source buffer
+  public appending: boolean = false;
+
+  // counters
+  public appended: number = 0;
+  public appendError: number = 0;
+  public flushBufferCounter: number = 0;
+
+  public tracks: TrackSet = {};
+  public pendingTracks: TrackSet = {};
+  public sourceBuffer: SourceBuffers = {};
+  public flushRange: SourceBufferFlushRange[] = [];
+
+  constructor (hls: any) {
     super(hls,
-      Event.MEDIA_ATTACHING,
-      Event.MEDIA_DETACHING,
-      Event.MANIFEST_PARSED,
-      Event.BUFFER_RESET,
-      Event.BUFFER_APPENDING,
-      Event.BUFFER_CODECS,
-      Event.BUFFER_EOS,
-      Event.BUFFER_FLUSHING,
-      Event.LEVEL_PTS_UPDATED,
-      Event.LEVEL_UPDATED);
-
-    // the value that we have set mediasource.duration to
-    // (the actual duration may be tweaked slighly by the browser)
-    this._msDuration = null;
-    // the value that we want to set mediaSource.duration to
-    this._levelDuration = null;
-    // the target duration of the current media playlist
-    this._levelTargetDuration = 10;
-    // current stream state: true - for live broadcast, false - for VoD content
-    this._live = null;
-    // cache the self generated object url to detect hijack of video tag
-    this._objectUrl = null;
-    // The number of BUFFER_CODEC events received before any sourceBuffers are created
-    this.bufferCodecEventsExpected = 0;
-
-    // Source Buffer listeners
-    this.onsbue = this.onSBUpdateEnd.bind(this);
-    this.onsbe = this.onSBUpdateError.bind(this);
-    this.pendingTracks = {};
-    this.tracks = {};
+      Events.MEDIA_ATTACHING,
+      Events.MEDIA_DETACHING,
+      Events.MANIFEST_PARSED,
+      Events.BUFFER_RESET,
+      Events.BUFFER_APPENDING,
+      Events.BUFFER_CODECS,
+      Events.BUFFER_EOS,
+      Events.BUFFER_FLUSHING,
+      Events.LEVEL_PTS_UPDATED,
+      Events.LEVEL_UPDATED);
   }
 
   destroy () {
     EventHandler.prototype.destroy.call(this);
   }
 
-  onLevelPtsUpdated (data) {
+  onLevelPtsUpdated (data: { type: SourceBufferName, start: number }) {
     let type = data.type;
     let audioTrack = this.tracks.audio;
 
@@ -62,6 +107,10 @@ class BufferController extends EventHandler {
 
     if (type === 'audio' && audioTrack && audioTrack.container === 'audio/mpeg') { // Chrome audio mp3 track
       let audioBuffer = this.sourceBuffer.audio;
+      if (!audioBuffer) {
+        throw Error('Level PTS Updated and source buffer for audio uninitalized');
+      }
+
       let delta = Math.abs(audioBuffer.timestampOffset - data.start);
 
       // adjust timestamp offset if time delta is greater than 100ms
@@ -84,7 +133,7 @@ class BufferController extends EventHandler {
     }
   }
 
-  onManifestParsed (data) {
+  onManifestParsed (data: { altAudio: boolean }) {
     // in case of alt audio 2 BUFFER_CODECS events will be triggered, one per stream controller
     // sourcebuffers will be created all at once when the expected nb of tracks will be reached
     // in case alt audio is not used, only one BUFFER_CODEC event will be fired from main stream controller
@@ -93,18 +142,15 @@ class BufferController extends EventHandler {
     logger.log(`${this.bufferCodecEventsExpected} bufferCodec event(s) expected`);
   }
 
-  onMediaAttaching (data) {
+  onMediaAttaching (data: { media: HTMLMediaElement }) {
     let media = this.media = data.media;
     if (media) {
       // setup the media source
       let ms = this.mediaSource = new MediaSource();
       // Media Source listeners
-      this.onmso = this.onMediaSourceOpen.bind(this);
-      this.onmse = this.onMediaSourceEnded.bind(this);
-      this.onmsc = this.onMediaSourceClose.bind(this);
-      ms.addEventListener('sourceopen', this.onmso);
-      ms.addEventListener('sourceended', this.onmse);
-      ms.addEventListener('sourceclose', this.onmsc);
+      ms.addEventListener('sourceopen', this._onMediaSourceOpen);
+      ms.addEventListener('sourceended', this._onMediaSourceEnded);
+      ms.addEventListener('sourceclose', this._onMediaSourceClose);
       // link video and media Source
       media.src = window.URL.createObjectURL(ms);
       // cache the locally generated object url
@@ -127,14 +173,16 @@ class BufferController extends EventHandler {
           logger.warn(`onMediaDetaching:${err.message} while calling endOfStream`);
         }
       }
-      ms.removeEventListener('sourceopen', this.onmso);
-      ms.removeEventListener('sourceended', this.onmse);
-      ms.removeEventListener('sourceclose', this.onmsc);
+      ms.removeEventListener('sourceopen', this._onMediaSourceOpen);
+      ms.removeEventListener('sourceended', this._onMediaSourceEnded);
+      ms.removeEventListener('sourceclose', this._onMediaSourceClose);
 
       // Detach properly the MediaSource from the HTMLMediaElement as
       // suggested in https://github.com/w3c/media-source/issues/53.
       if (this.media) {
-        window.URL.revokeObjectURL(this._objectUrl);
+        if (this._objectUrl) {
+          window.URL.revokeObjectURL(this._objectUrl);
+        }
 
         // clean up video tag src only if it's our own url. some external libraries might
         // hijack the video tag and change its 'src' without destroying the Hls instance first
@@ -156,23 +204,13 @@ class BufferController extends EventHandler {
       this.segments = [];
       this.appended = 0;
     }
-    this.onmso = this.onmse = this.onmsc = null;
-    this.hls.trigger(Event.MEDIA_DETACHED);
-  }
 
-  onMediaSourceOpen () {
-    logger.log('media source opened');
-    this.hls.trigger(Event.MEDIA_ATTACHED, { media: this.media });
-    let mediaSource = this.mediaSource;
-    if (mediaSource) {
-      // once received, don't listen anymore to sourceopen event
-      mediaSource.removeEventListener('sourceopen', this.onmso);
-    }
-    this.checkPendingTracks();
+    this.hls.trigger(Events.MEDIA_DETACHED);
   }
 
   checkPendingTracks () {
     let { bufferCodecEventsExpected, pendingTracks } = this;
+
     // Check if we've received all of the expected bufferCodec events. When none remain, create all the sourceBuffers at once.
     // This is important because the MSE spec allows implementations to throw QuotaExceededErrors if creating new sourceBuffers after
     // data has been appended to existing ones.
@@ -187,18 +225,30 @@ class BufferController extends EventHandler {
     }
   }
 
-  onMediaSourceClose () {
+  private _onMediaSourceOpen = () => {
+    logger.log('media source opened');
+    this.hls.trigger(Events.MEDIA_ATTACHED, { media: this.media });
+    let mediaSource = this.mediaSource;
+    if (mediaSource) {
+      // once received, don't listen anymore to sourceopen event
+      mediaSource.removeEventListener('sourceopen', this._onMediaSourceOpen);
+    }
+    this.checkPendingTracks();
+  }
+
+  private _onMediaSourceClose = () => {
     logger.log('media source closed');
   }
 
-  onMediaSourceEnded () {
+  private _onMediaSourceEnded = () => {
     logger.log('media source ended');
   }
 
-  onSBUpdateEnd () {
+  private _onSBUpdateEnd = () => {
     // update timestampOffset
-    if (this.audioTimestampOffset) {
+    if (this.audioTimestampOffset && this.sourceBuffer.audio) {
       let audioBuffer = this.sourceBuffer.audio;
+
       logger.warn(`change mpeg audio timestamp offset from ${audioBuffer.timestampOffset} to ${this.audioTimestampOffset}`);
       audioBuffer.timestampOffset = this.audioTimestampOffset;
       delete this.audioTimestampOffset;
@@ -218,13 +268,17 @@ class BufferController extends EventHandler {
     let pending = this.segments.reduce((counter, segment) => (segment.parent === parent) ? counter + 1 : counter, 0);
 
     // this.sourceBuffer is better to use than media.buffered as it is closer to the PTS data from the fragments
-    let timeRanges = {};
-    const sourceBuffer = this.sourceBuffer;
-    for (let streamType in sourceBuffer) {
-      timeRanges[streamType] = sourceBuffer[streamType].buffered;
+    const timeRanges: Partial<Record<SourceBufferName, TimeRanges>> = {};
+    const sbSet = this.sourceBuffer;
+    for (let streamType in sbSet) {
+      const sb = sbSet[streamType as SourceBufferName];
+      if (!sb) {
+        throw Error(`handling source buffer update end error: source buffer for ${streamType} uninitilized and unable to update buffered TimeRanges.`);
+      }
+      timeRanges[streamType as SourceBufferName] = sb.buffered;
     }
 
-    this.hls.trigger(Event.BUFFER_APPENDED, { parent, pending, timeRanges });
+    this.hls.trigger(Events.BUFFER_APPENDED, { parent, pending, timeRanges });
     // don't append in flushing mode
     if (!this._needsFlush) {
       this.doAppending();
@@ -238,23 +292,27 @@ class BufferController extends EventHandler {
     }
   }
 
-  onSBUpdateError (event) {
+  private _onSBUpdateError = (event: Event) => {
     logger.error('sourceBuffer error:', event);
     // according to http://www.w3.org/TR/media-source/#sourcebuffer-append-error
     // this error might not always be fatal (it is fatal if decode error is set, in that case
     // it will be followed by a mediaElement error ...)
-    this.hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_APPENDING_ERROR, fatal: false });
+    this.hls.trigger(Events.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_APPENDING_ERROR, fatal: false });
     // we don't need to do more than that, as accordin to the spec, updateend will be fired just after
   }
 
   onBufferReset () {
-    let sourceBuffer = this.sourceBuffer;
+    const sourceBuffer = this.sourceBuffer;
     for (let type in sourceBuffer) {
-      let sb = sourceBuffer[type];
+      const sb = sourceBuffer[type];
       try {
-        this.mediaSource.removeSourceBuffer(sb);
-        sb.removeEventListener('updateend', this.onsbue);
-        sb.removeEventListener('error', this.onsbe);
+        if (sb) {
+          if (this.mediaSource) {
+            this.mediaSource.removeSourceBuffer(sb);
+          }
+          sb.removeEventListener('updateend', this._onSBUpdateEnd);
+          sb.removeEventListener('error', this._onSBUpdateError);
+        }
       } catch (err) {
       }
     }
@@ -264,7 +322,7 @@ class BufferController extends EventHandler {
     this.appended = 0;
   }
 
-  onBufferCodecs (tracks) {
+  onBufferCodecs (tracks: TrackSet) {
     // if source buffer(s) not created yet, appended buffer tracks in this.pendingTracks
     // if sourcebuffers already created, do nothing ...
     if (Object.keys(this.sourceBuffer).length) {
@@ -275,39 +333,48 @@ class BufferController extends EventHandler {
       this.pendingTracks[trackName] = tracks[trackName];
     });
 
-    const { mediaSource } = this;
     this.bufferCodecEventsExpected = Math.max(this.bufferCodecEventsExpected - 1, 0);
-    if (mediaSource && mediaSource.readyState === 'open') {
+    if (this.mediaSource && this.mediaSource.readyState === 'open') {
       this.checkPendingTracks();
     }
   }
 
-  createSourceBuffers (tracks) {
-    let sourceBuffer = this.sourceBuffer, mediaSource = this.mediaSource;
+  createSourceBuffers (tracks: TrackSet) {
+    const { sourceBuffer, mediaSource } = this;
+    if (!mediaSource) {
+      throw Error('createSourceBuffers called when mediaSource was null');
+    }
 
     for (let trackName in tracks) {
       if (!sourceBuffer[trackName]) {
-        let track = tracks[trackName];
+        let track = tracks[trackName as keyof TrackSet];
+        if (!track) {
+          throw Error(`source buffer exists for track ${trackName}, however track does not`);
+        }
         // use levelCodec as first priority
         let codec = track.levelCodec || track.codec;
         let mimeType = `${track.container};codecs=${codec}`;
         logger.log(`creating sourceBuffer(${mimeType})`);
         try {
           let sb = sourceBuffer[trackName] = mediaSource.addSourceBuffer(mimeType);
-          sb.addEventListener('updateend', this.onsbue);
-          sb.addEventListener('error', this.onsbe);
-          this.tracks[trackName] = { codec: codec, container: track.container };
-          track.buffer = sb;
+          sb.addEventListener('updateend', this._onSBUpdateEnd);
+          sb.addEventListener('error', this._onSBUpdateError);
+          this.tracks[trackName] = {
+            buffer: sb,
+            codec: codec,
+            container: track.container,
+            levelCodec: track.levelCodec
+          };
         } catch (err) {
           logger.error(`error while trying to add sourceBuffer:${err.message}`);
-          this.hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_ADD_CODEC_ERROR, fatal: false, err: err, mimeType: mimeType });
+          this.hls.trigger(Events.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_ADD_CODEC_ERROR, fatal: false, err: err, mimeType: mimeType });
         }
       }
     }
-    this.hls.trigger(Event.BUFFER_CREATED, { tracks: tracks });
+    this.hls.trigger(Events.BUFFER_CREATED, { tracks: this.tracks });
   }
 
-  onBufferAppending (data) {
+  onBufferAppending (data: Segment) {
     if (!this._needsFlush) {
       if (!this.segments) {
         this.segments = [ data ];
@@ -319,47 +386,44 @@ class BufferController extends EventHandler {
     }
   }
 
-  onBufferAppendFail (data) {
-    logger.error('sourceBuffer error:', data.event);
-    // according to http://www.w3.org/TR/media-source/#sourcebuffer-append-error
-    // this error might not always be fatal (it is fatal if decode error is set, in that case
-    // it will be followed by a mediaElement error ...)
-    this.hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_APPENDING_ERROR, fatal: false });
-  }
-
   // on BUFFER_EOS mark matching sourcebuffer(s) as ended and trigger checkEos()
-  onBufferEos (data) {
-    let sb = this.sourceBuffer;
-    let dataType = data.type;
-    for (let type in sb) {
-      if (!dataType || type === dataType) {
-        if (!sb[type].ended) {
-          sb[type].ended = true;
+  // an undefined data.type will mark all buffers as EOS.
+  onBufferEos (data: { type?: SourceBufferName }) {
+    for (const type in this.sourceBuffer) {
+      if (!data.type || data.type === type) {
+        const sb = this.sourceBuffer[type as SourceBufferName];
+        if (sb && !sb.ended) {
+          sb.ended = true;
           logger.log(`${type} sourceBuffer now EOS`);
         }
       }
     }
+
     this.checkEos();
   }
 
   // if all source buffers are marked as ended, signal endOfStream() to MediaSource.
   checkEos () {
-    let sb = this.sourceBuffer, mediaSource = this.mediaSource;
+    const { sourceBuffer, mediaSource } = this;
     if (!mediaSource || mediaSource.readyState !== 'open') {
       this._needsEos = false;
       return;
     }
-    for (let type in sb) {
-      let sbobj = sb[type];
-      if (!sbobj.ended) {
+
+    for (let type in sourceBuffer) {
+      const sb = sourceBuffer[type as SourceBufferName];
+      if (!sb) continue;
+
+      if (!sb.ended) {
         return;
       }
 
-      if (sbobj.updating) {
+      if (sb.updating) {
         this._needsEos = true;
         return;
       }
     }
+
     logger.log('all media data are available, signal endOfStream() to MediaSource and stop loading fragment');
     // Notify the media element that it now has all of the media data
     try {
@@ -370,7 +434,7 @@ class BufferController extends EventHandler {
     this._needsEos = false;
   }
 
-  onBufferFlushing (data) {
+  onBufferFlushing (data: { startOffset: number, endOffset: number, type: SourceBufferName }) {
     this.flushRange.push({ start: data.startOffset, end: data.endOffset, type: data.type });
     // attempt flush immediately
     this.flushBufferCounter = 0;
@@ -378,6 +442,10 @@ class BufferController extends EventHandler {
   }
 
   flushLiveBackBuffer () {
+    if (!this.media) {
+      throw Error('flushLiveBackBuffer called without attaching media');
+    }
+
     // clear back buffer for live only
     if (!this._live) {
       return;
@@ -394,19 +462,22 @@ class BufferController extends EventHandler {
     const targetBackBufferPosition = currentTime - Math.max(liveBackBufferLength, this._levelTargetDuration);
 
     for (let index = bufferTypes.length - 1; index >= 0; index--) {
-      const bufferType = bufferTypes[index], buffered = sourceBuffer[bufferType].buffered;
-
-      // when target buffer start exceeds actual buffer start
-      if (buffered.length > 0 && targetBackBufferPosition > buffered.start(0)) {
-        // remove buffer up until current time minus minimum back buffer length (removing buffer too close to current
-        // time will lead to playback freezing)
-        // credits for level target duration - https://github.com/videojs/http-streaming/blob/3132933b6aa99ddefab29c10447624efd6fd6e52/src/segment-loader.js#L91
-        this.removeBufferRange(bufferType, sourceBuffer[bufferType], 0, targetBackBufferPosition);
+      const bufferType = bufferTypes[index];
+      const sb = sourceBuffer[bufferType as SourceBufferName];
+      if (sb) {
+        const buffered = sb.buffered;
+        // when target buffer start exceeds actual buffer start
+        if (buffered.length > 0 && targetBackBufferPosition > buffered.start(0)) {
+          // remove buffer up until current time minus minimum back buffer length (removing buffer too close to current
+          // time will lead to playback freezing)
+          // credits for level target duration - https://github.com/videojs/http-streaming/blob/3132933b6aa99ddefab29c10447624efd6fd6e52/src/segment-loader.js#L91
+          this.removeBufferRange(bufferType, sb, 0, targetBackBufferPosition);
+        }
       }
     }
   }
 
-  onLevelUpdated ({ details }) {
+  onLevelUpdated ({ details }: { details: { totalduration: number, targetduration?: number, averagetargetduration?: number, live: boolean, fragments: any[] } }) {
     if (details.fragments.length > 0) {
       this._levelDuration = details.totalduration + details.fragments[0].start;
       this._levelTargetDuration = details.averagetargetduration || details.targetduration || 10;
@@ -422,7 +493,7 @@ class BufferController extends EventHandler {
    */
   updateMediaElementDuration () {
     let { config } = this.hls;
-    let duration;
+    let duration: number;
 
     if (this._levelDuration === null ||
       !this.media ||
@@ -434,7 +505,8 @@ class BufferController extends EventHandler {
     }
 
     for (let type in this.sourceBuffer) {
-      if (this.sourceBuffer[type].updating === true) {
+      const sb = this.sourceBuffer[type];
+      if (sb && sb.updating === true) {
         // can't set duration whilst a buffer is updating
         return;
       }
@@ -484,7 +556,10 @@ class BufferController extends EventHandler {
       let sourceBuffer = this.sourceBuffer;
       try {
         for (let type in sourceBuffer) {
-          appended += sourceBuffer[type].buffered.length;
+          const sb = sourceBuffer[type];
+          if (sb) {
+            appended += sb.buffered.length;
+          }
         }
       } catch (error) {
         // error could be thrown while accessing buffered, in case sourcebuffer has already been removed from MediaSource
@@ -492,80 +567,80 @@ class BufferController extends EventHandler {
         logger.error('error while accessing sourceBuffer.buffered');
       }
       this.appended = appended;
-      this.hls.trigger(Event.BUFFER_FLUSHED);
+      this.hls.trigger(Events.BUFFER_FLUSHED);
     }
   }
 
   doAppending () {
-    let { hls, segments, sourceBuffer } = this;
-    if (Object.keys(sourceBuffer).length) {
-      if (this.media.error) {
-        this.segments = [];
-        logger.error('trying to append although a media error occured, flush segment and abort');
+    let { hls, segments, sourceBuffer, media } = this;
+    if (!Object.keys(sourceBuffer).length) {
+      // early exit if no source buffers have been initialized yet
+      return;
+    }
+
+    if (!this.media || this.media.error) {
+      this.segments = [];
+      logger.error('trying to append although a media error occured, flush segment and abort');
+      return;
+    }
+
+    if (this.appending) {
+      // logger.log(`sb appending in progress`);
+      return;
+    }
+
+    const segment = segments.shift();
+    if (!segment) { // handle undefined shift
+      return;
+    }
+
+    try {
+      const sb = sourceBuffer[segment.type];
+      if (!sb) {
+        // in case we don't have any source buffer matching with this segment type,
+        // it means that Mediasource fails to create sourcebuffer
+        // discard this segment, and trigger update end
+        this._onSBUpdateEnd();
         return;
       }
-      if (this.appending) {
-        // logger.log(`sb appending in progress`);
+
+      if (sb.updating) {
+        // if we are still updating the source buffer from the last segment, place this back at the front of the queue
+        segments.unshift(segment);
         return;
       }
-      if (segments && segments.length) {
-        let segment = segments.shift();
-        try {
-          let type = segment.type, sb = sourceBuffer[type];
-          if (sb) {
-            if (!sb.updating) {
-              // reset sourceBuffer ended flag before appending segment
-              sb.ended = false;
-              // logger.log(`appending ${segment.content} ${type} SB, size:${segment.data.length}, ${segment.parent}`);
-              this.parent = segment.parent;
-              sb.appendBuffer(segment.data);
-              this.appendError = 0;
-              this.appended++;
-              this.appending = true;
-            } else {
-              segments.unshift(segment);
-            }
-          } else {
-            // in case we don't have any source buffer matching with this segment type,
-            // it means that Mediasource fails to create sourcebuffer
-            // discard this segment, and trigger update end
-            this.onSBUpdateEnd();
-          }
-        } catch (err) {
-          // in case any error occured while appending, put back segment in segments table
-          logger.error(`error while trying to append buffer:${err.message}`);
-          segments.unshift(segment);
-          let event = { type: ErrorTypes.MEDIA_ERROR, parent: segment.parent };
-          if (err.code !== 22) {
-            if (this.appendError) {
-              this.appendError++;
-            } else {
-              this.appendError = 1;
-            }
-
-            event.details = ErrorDetails.BUFFER_APPEND_ERROR;
-            /* with UHD content, we could get loop of quota exceeded error until
-              browser is able to evict some data from sourcebuffer. retrying help recovering this
-            */
-            if (this.appendError > hls.config.appendErrorMaxRetry) {
-              logger.log(`fail ${hls.config.appendErrorMaxRetry} times to append segment in sourceBuffer`);
-              this.segments = [];
-              event.fatal = true;
-              hls.trigger(Event.ERROR, event);
-            } else {
-              event.fatal = false;
-              hls.trigger(Event.ERROR, event);
-            }
-          } else {
-            // QuotaExceededError: http://www.w3.org/TR/html5/infrastructure.html#quotaexceedederror
-            // let's stop appending any segments, and report BUFFER_FULL_ERROR error
-            this.segments = [];
-            event.details = ErrorDetails.BUFFER_FULL_ERROR;
-            event.fatal = false;
-            hls.trigger(Event.ERROR, event);
-          }
+
+      // reset sourceBuffer ended flag before appending segment
+      sb.ended = false;
+      // logger.log(`appending ${segment.content} ${type} SB, size:${segment.data.length}, ${segment.parent}`);
+      this.parent = segment.parent;
+      sb.appendBuffer(segment.data);
+      this.appendError = 0;
+      this.appended++;
+      this.appending = true;
+    } catch (err) {
+      // in case any error occured while appending, put back segment in segments table
+      logger.error(`error while trying to append buffer:${err.message}`);
+      segments.unshift(segment);
+      let event = { type: ErrorTypes.MEDIA_ERROR, parent: segment.parent, details: '', fatal: false };
+      if (err.code === 22) {
+        // QuotaExceededError: http://www.w3.org/TR/html5/infrastructure.html#quotaexceedederror
+        // let's stop appending any segments, and report BUFFER_FULL_ERROR error
+        this.segments = [];
+        event.details = ErrorDetails.BUFFER_FULL_ERROR;
+      } else {
+        this.appendError++;
+        event.details = ErrorDetails.BUFFER_APPEND_ERROR;
+        /* with UHD content, we could get loop of quota exceeded error until
+          browser is able to evict some data from sourcebuffer. retrying help recovering this
+        */
+        if (this.appendError > hls.config.appendErrorMaxRetry) {
+          logger.log(`fail ${hls.config.appendErrorMaxRetry} times to append segment in sourceBuffer`);
+          this.segments = [];
+          event.fatal = true;
         }
       }
+      hls.trigger(Events.ERROR, event);
     }
   }
 
@@ -574,38 +649,41 @@ class BufferController extends EventHandler {
     return true once range has been flushed.
     as sourceBuffer.remove() is asynchronous, flushBuffer will be retriggered on sourceBuffer update end
   */
-  flushBuffer (startOffset, endOffset, typeIn) {
-    let sb;
+  flushBuffer (startOffset: number, endOffset: number, sbType: SourceBufferName): boolean {
     const sourceBuffer = this.sourceBuffer;
-    if (Object.keys(sourceBuffer).length) {
-      logger.log(`flushBuffer,pos/start/end: ${this.media.currentTime.toFixed(3)}/${startOffset}/${endOffset}`);
-      // safeguard to avoid infinite looping : don't try to flush more than the nb of appended segments
-      if (this.flushBufferCounter < this.appended) {
-        for (let type in sourceBuffer) {
-          // check if sourcebuffer type is defined (typeIn): if yes, let's only flush this one
-          // if no, let's flush all sourcebuffers
-          if (typeIn && type !== typeIn) {
-            continue;
-          }
+    // exit if no sourceBuffers are initialized
+    if (!Object.keys(sourceBuffer).length) {
+      return true;
+    }
 
-          sb = sourceBuffer[type];
-          // we are going to flush buffer, mark source buffer as 'not ended'
-          sb.ended = false;
-          if (!sb.updating) {
-            if (this.removeBufferRange(type, sb, startOffset, endOffset)) {
-              this.flushBufferCounter++;
-              return false;
-            }
-          } else {
-            logger.warn('cannot flush, sb updating in progress');
-            return false;
-          }
+    let currentTime: string = 'null';
+    if (this.media) {
+      currentTime = this.media.currentTime.toFixed(3);
+    }
+    logger.log(`flushBuffer,pos/start/end: ${currentTime}/${startOffset}/${endOffset}`);
+
+    // safeguard to avoid infinite looping : don't try to flush more than the nb of appended segments
+    if (this.flushBufferCounter >= this.appended) {
+      logger.warn('abort flushing too many retries');
+      return true;
+    }
+
+    const sb = sourceBuffer[sbType];
+    // we are going to flush buffer, mark source buffer as 'not ended'
+    if (sb) {
+      sb.ended = false;
+      if (!sb.updating) {
+        if (this.removeBufferRange(sbType, sb, startOffset, endOffset)) {
+          this.flushBufferCounter++;
+          return false;
         }
       } else {
-        logger.warn('abort flushing too many retries');
+        logger.warn('cannot flush, sb updating in progress');
+        return false;
       }
-      logger.log('buffer flushed');
     }
+
+    logger.log('buffer flushed');
     // everything flushed !
     return true;
   }
@@ -613,14 +691,14 @@ class BufferController extends EventHandler {
   /**
    * Removes first buffered range from provided source buffer that lies within given start and end offsets.
    *
-   * @param type Type of the source buffer, logging purposes only.
-   * @param sb Target SourceBuffer instance.
-   * @param startOffset
-   * @param endOffset
+   * @param {string} type Type of the source buffer, logging purposes only.
+   * @param {SourceBuffer} sb Target SourceBuffer instance.
+   * @param {number} startOffset
+   * @param {number} endOffset
    *
    * @returns {boolean} True when source buffer remove requested.
    */
-  removeBufferRange (type, sb, startOffset, endOffset) {
+  removeBufferRange (type: string, sb: ExtendedSourceBuffer, startOffset: number, endOffset: number): boolean {
     try {
       for (let i = 0; i < sb.buffered.length; i++) {
         let bufStart = sb.buffered.start(i);
@@ -634,7 +712,12 @@ class BufferController extends EventHandler {
           only flush buffer range of length greater than 500ms.
         */
         if (Math.min(removeEnd, bufEnd) - removeStart > 0.5) {
-          logger.log(`sb remove ${type} [${removeStart},${removeEnd}], of [${bufStart},${bufEnd}], pos:${this.media.currentTime}`);
+          let currentTime: string = 'null';
+          if (this.media) {
+            currentTime = this.media.currentTime.toString();
+          }
+
+          logger.log(`sb remove ${type} [${removeStart},${removeEnd}], of [${bufStart},${bufEnd}], pos:${currentTime}`);
           sb.remove(removeStart, removeEnd);
           return true;
         }
diff --git a/src/types/segment.ts b/src/types/segment.ts
new file mode 100644
index 00000000000..e4633220cbd
--- /dev/null
+++ b/src/types/segment.ts
@@ -0,0 +1,6 @@
+export interface Segment {
+  type: string;
+  data: ArrayBuffer;
+  parent: string;
+  content: string;
+}
diff --git a/src/types/track.ts b/src/types/track.ts
new file mode 100644
index 00000000000..324ccbc7229
--- /dev/null
+++ b/src/types/track.ts
@@ -0,0 +1,20 @@
+export interface TrackSet {
+  audio?: AudioTrack
+  video?: VideoTrack
+}
+
+export interface AudioTrack {
+  buffer: SourceBuffer;
+  container: string;
+  codec: string;
+  initSegment?: Uint8Array;
+  levelCodec: string;
+}
+
+export interface VideoTrack {
+  buffer: SourceBuffer;
+  container: string;
+  codec: string;
+  initSegment?: Uint8Array;
+  levelCodec: string;
+}
diff --git a/src/utils/logger.js b/src/utils/logger.js
index a9a041d1f04..6ca0e0a51be 100644
--- a/src/utils/logger.js
+++ b/src/utils/logger.js
@@ -1,6 +1,6 @@
 import { getSelfScope } from './get-self-scope';
 
-function noop () {}
+function noop (...args) {}
 
 const fakeLogger = {
   trace: noop,
diff --git a/tests/unit/controller/buffer-controller.js b/tests/unit/controller/buffer-controller.js
index f7ccbef047e..92f52f53607 100644
--- a/tests/unit/controller/buffer-controller.js
+++ b/tests/unit/controller/buffer-controller.js
@@ -107,12 +107,12 @@ describe('BufferController tests', function () {
 
       sandbox.stub(bufferController, 'doAppending');
 
-      bufferController.onSBUpdateEnd();
+      bufferController._onSBUpdateEnd();
 
       assert(flushSpy.notCalled, 'clear live back buffer was called');
 
       bufferController.segments = [];
-      bufferController.onSBUpdateEnd();
+      bufferController._onSBUpdateEnd();
 
       assert(flushSpy.calledOnce, 'clear live back buffer was not called once');
     });
@@ -131,6 +131,32 @@ describe('BufferController tests', function () {
       assert.strictEqual(bufferController.bufferCodecEventsExpected, 0);
     });
 
+    it('should throw if no media element has been attached', function () {
+      bufferController.createSourceBuffers.restore();
+      bufferController.pendingTracks = { video: {} };
+
+      assert.throws(bufferController.checkPendingTracks);
+    });
+
+    it('exposes tracks from buffer controller through BUFFER_CREATED event', function (done) {
+      bufferController.createSourceBuffers.restore();
+
+      let video = document.createElement('video');
+      bufferController.onMediaAttaching({ media: video });
+
+      hls.on(Hls.Events.BUFFER_CREATED, (_, data) => {
+        const tracks = data.tracks;
+        assert.notStrictEqual(bufferController.pendingTracks, tracks);
+        assert.strictEqual(bufferController.tracks, tracks);
+        done();
+      });
+
+      bufferController.pendingTracks = { video: { codec: 'testing' } };
+      bufferController.checkPendingTracks();
+
+      video = null;
+    });
+
     it('expects one bufferCodec event by default', function () {
       bufferController.onManifestParsed({});
       assert.strictEqual(bufferController.bufferCodecEventsExpected, 1);
@@ -158,7 +184,7 @@ describe('BufferController tests', function () {
     });
 
     it('checks pending tracks in onMediaSourceOpen', function () {
-      bufferController.onMediaSourceOpen();
+      bufferController._onMediaSourceOpen();
       assert.strictEqual(checkPendingTracksSpy.calledOnce, true);
     });
 
@@ -181,7 +207,7 @@ describe('BufferController tests', function () {
       bufferController.mediaSource = { readyState: 'open', removeEventListener: sandbox.stub() };
 
       bufferController.onManifestParsed({ altAudio: true });
-      bufferController.onMediaSourceOpen();
+      bufferController._onMediaSourceOpen();
       bufferController.onBufferCodecs({ audio: {} });
       bufferController.onBufferCodecs({ video: {} });
 
diff --git a/tsconfig.json b/tsconfig.json
index 8ba77248e1d..9d6fc6833c9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,15 +4,21 @@
     "allowJs": true,
     "module": "commonjs",
     "target": "ES5",
-    "strict": false
+    "strict": false,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "lib": [
+      "dom",
+      "es2015",
+    ],
+    "outDir": "./dist/",
   },
   "include": [
-    "demo/**/*",
-    "src/**/*",
-    "tests/**/*"
+    "src/**/*"
   ],
   "exclude": [
     "node_modules",
+    "dist/**/*",
     "**/*.spec.*"
   ]
 }

From 20ac9cbef7c3e00cb924d5bdf07ea937cb637e2f Mon Sep 17 00:00:00 2001
From: Alexey Berezin <beraliv.spb@gmail.com>
Date: Mon, 21 Jan 2019 20:17:22 +0300
Subject: [PATCH 05/59] test: review changes

---
 tests/unit/controller/abr-controller.js |  5 +++++
 tests/unit/hls.js                       | 10 +---------
 2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/tests/unit/controller/abr-controller.js b/tests/unit/controller/abr-controller.js
index c3f5ee711b1..68ce976fde4 100644
--- a/tests/unit/controller/abr-controller.js
+++ b/tests/unit/controller/abr-controller.js
@@ -5,6 +5,11 @@ import Hls from '../../../src/hls';
 const assert = require('assert');
 
 describe('AbrController', () => {
+  it('should return correct _bwEstimator', () => {
+    let hls = new Hls();
+    assert.strictEqual(hls.abrController._bwEstimator, null);
+  });
+
   it('should return correct next auto level', () => {
     let hls = new Hls({ maxStarvationDelay: 4 });
     hls.levelController._levels = [
diff --git a/tests/unit/hls.js b/tests/unit/hls.js
index 62953000d9e..cdf26f6d1ef 100644
--- a/tests/unit/hls.js
+++ b/tests/unit/hls.js
@@ -4,15 +4,7 @@ const assert = require('assert');
 
 describe('Hls', () => {
   it('should return bandwidth estimate', () => {
-    let hls = new Hls({ maxStarvationDelay: 4 });
-    hls.levelController._levels = [
-      { bitrate: 105000, name: '144', details: { totalduration: 4, fragments: [{}] } },
-      { bitrate: 246440, name: '240', details: { totalduration: 10, fragments: [ {} ] } },
-      { bitrate: 460560, name: '380', details: { totalduration: 10, fragments: [ {} ] } },
-      { bitrate: 836280, name: '480', details: { totalduration: 10, fragments: [ {} ] } },
-      { bitrate: 2149280, name: '720', details: { totalduration: 10, fragments: [ {} ] } },
-      { bitrate: 6221600, name: '1080', details: { totalduration: 10, fragments: [ {} ] } }
-    ];
+    let hls = new Hls();
     assert.equal(isNaN(hls.bandwidthEstimate), true);
   });
 });

From 982f309809bb50cf6f80fe920825c16538f93458 Mon Sep 17 00:00:00 2001
From: Alexey Berezin <beraliv.spb@gmail.com>
Date: Mon, 21 Jan 2019 20:17:38 +0300
Subject: [PATCH 06/59] docs: review fix

---
 docs/API.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/API.md b/docs/API.md
index e897e5dcbe2..a9798a8896e 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -1057,8 +1057,8 @@ Default value is `-1` (no level capping).
 ### `hls.bandwidthEstimate`
 
 - get: Return bandwidth estimate.
-  - if estimator is available: current bandwidth
-  - if `NaN`: estimator is not available
+  - number in Kb/s: current bandwidth if estimator is available
+  - `NaN`: estimator is not available
 
 ## Version Control
 

From 3eaa870385f1d8de35c6226edea5e7667a169b5a Mon Sep 17 00:00:00 2001
From: Alexey Berezin <beraliv.spb@gmail.com>
Date: Mon, 21 Jan 2019 20:20:28 +0300
Subject: [PATCH 07/59] prod: add review fix

---
 src/hls.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/hls.js b/src/hls.js
index cc75a47179f..48b95825965 100644
--- a/src/hls.js
+++ b/src/hls.js
@@ -458,8 +458,7 @@ export default class Hls extends Observer {
    * @type {number}
    */
   get bandwidthEstimate () {
-    const hls = this;
-    const bwEstimator = hls.abrController._bwEstimator;
+    const bwEstimator = this.abrController._bwEstimator;
     return bwEstimator ? bwEstimator.getEstimate() : NaN;
   }
 

From a0465f60ef703ec7f0b0f3fcf9351ab0de67f1f1 Mon Sep 17 00:00:00 2001
From: John Bartos <jbartos7@gmail.com>
Date: Mon, 21 Jan 2019 22:26:35 +0300
Subject: [PATCH 08/59] docs: update

Co-Authored-By: Beraliv <beraliv.spb@gmail.com>
---
 docs/API.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/API.md b/docs/API.md
index a9798a8896e..3f44a1d504d 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -1055,6 +1055,7 @@ Default value is `hls.firstLevel`.
 Default value is `-1` (no level capping).
 
 ### `hls.bandwidthEstimate`
+get: If Returns the current bandwidth estimate, in Kb/s, if available. Otherwise, NaN is returned.
 
 - get: Return bandwidth estimate.
   - number in Kb/s: current bandwidth if estimator is available

From 86ec3355a044e641fb53c0310110cadf903a87c8 Mon Sep 17 00:00:00 2001
From: Alexey Berezin <beraliv.spb@gmail.com>
Date: Mon, 21 Jan 2019 22:30:29 +0300
Subject: [PATCH 09/59] docs: update 2

---
 docs/API.md | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/docs/API.md b/docs/API.md
index 3f44a1d504d..0a8b7a2e6e0 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -1055,11 +1055,8 @@ Default value is `hls.firstLevel`.
 Default value is `-1` (no level capping).
 
 ### `hls.bandwidthEstimate`
-get: If Returns the current bandwidth estimate, in Kb/s, if available. Otherwise, NaN is returned.
 
-- get: Return bandwidth estimate.
-  - number in Kb/s: current bandwidth if estimator is available
-  - `NaN`: estimator is not available
+get: Returns the current bandwidth estimate, in Kb/s, if available. Otherwise, `NaN` is returned.
 
 ## Version Control
 

From 938eaba9dae64487be1f934fe6dc0ab085372435 Mon Sep 17 00:00:00 2001
From: Alexey Berezin <beraliv.spb@gmail.com>
Date: Mon, 21 Jan 2019 22:35:30 +0300
Subject: [PATCH 10/59] docs: fix link

---
 docs/API.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/API.md b/docs/API.md
index 0a8b7a2e6e0..50c39716695 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -89,7 +89,7 @@
   - [`hls.startLevel`](#hlsstartlevel)
   - [`hls.autoLevelEnabled`](#hlsautolevelenabled)
   - [`hls.autoLevelCapping`](#hlsautolevelcapping)
-  - [`hls.bandwidthEstimate`](#bandwidthestimate)
+  - [`hls.bandwidthEstimate`](#hlsbandwidthestimate)
 - [Version Control](#version-control)
   - [`Hls.version`](#hlsversion)
 - [Network Loading Control API](#network-loading-control-api)

From 77be93dd01082b77262270186571fe434b51907b Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Tue, 22 Jan 2019 10:13:55 +0300
Subject: [PATCH 11/59] test: equal => strictEqual

---
 tests/unit/hls.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/unit/hls.js b/tests/unit/hls.js
index cdf26f6d1ef..b686396f5a4 100644
--- a/tests/unit/hls.js
+++ b/tests/unit/hls.js
@@ -5,6 +5,6 @@ const assert = require('assert');
 describe('Hls', () => {
   it('should return bandwidth estimate', () => {
     let hls = new Hls();
-    assert.equal(isNaN(hls.bandwidthEstimate), true);
+    assert.strictEqual(isNaN(hls.bandwidthEstimate), true);
   });
 });

From 4af7ed99134ea5e91afdf6480a5f91a969527920 Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Tue, 22 Jan 2019 10:21:15 +0300
Subject: [PATCH 12/59] test: add mocked _bwEstimator

---
 tests/unit/hls.js | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tests/unit/hls.js b/tests/unit/hls.js
index b686396f5a4..047570406af 100644
--- a/tests/unit/hls.js
+++ b/tests/unit/hls.js
@@ -3,8 +3,19 @@ import Hls from '../../src/hls';
 const assert = require('assert');
 
 describe('Hls', () => {
-  it('should return bandwidth estimate', () => {
-    let hls = new Hls();
+  it('should return a bandwidth estimate if the estimator exists', () => {
+    const MOCKED_ESTIMATE = 2000;
+    const hls = new Hls();
+    hls.abrController = {
+      _bwEstimator: {
+        getEstimate: () => MOCKED_ESTIMATE
+      }
+    };
+    assert.strictEqual(hls.bandwidthEstimate, MOCKED_ESTIMATE);
+  });
+
+  it('should return NaN if the estimator does not exist', () => {
+    const hls = new Hls();
     assert.strictEqual(isNaN(hls.bandwidthEstimate), true);
   });
 });

From 946ed075a14479dfe150752dff35c576987a91cb Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Tue, 22 Jan 2019 10:25:54 +0300
Subject: [PATCH 13/59] test: change description

---
 tests/unit/controller/abr-controller.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/unit/controller/abr-controller.js b/tests/unit/controller/abr-controller.js
index 68ce976fde4..4605aa3ea16 100644
--- a/tests/unit/controller/abr-controller.js
+++ b/tests/unit/controller/abr-controller.js
@@ -5,7 +5,7 @@ import Hls from '../../../src/hls';
 const assert = require('assert');
 
 describe('AbrController', () => {
-  it('should return correct _bwEstimator', () => {
+  it('should return null if _bwEstimator is not specified', () => {
     let hls = new Hls();
     assert.strictEqual(hls.abrController._bwEstimator, null);
   });

From fee36fd17bc54c7e7565f9cff6e3329e39d65a91 Mon Sep 17 00:00:00 2001
From: beraliv <beraliv@yandex-team.ru>
Date: Tue, 22 Jan 2019 18:05:56 +0300
Subject: [PATCH 14/59] test: (() => { ... }) => function () { ... }

---
 tests/unit/controller/abr-controller.js | 6 +++---
 tests/unit/hls.js                       | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tests/unit/controller/abr-controller.js b/tests/unit/controller/abr-controller.js
index 4605aa3ea16..96b7e8e1c59 100644
--- a/tests/unit/controller/abr-controller.js
+++ b/tests/unit/controller/abr-controller.js
@@ -4,13 +4,13 @@ import Hls from '../../../src/hls';
 
 const assert = require('assert');
 
-describe('AbrController', () => {
-  it('should return null if _bwEstimator is not specified', () => {
+describe('AbrController', function () {
+  it('should return null if _bwEstimator is not specified', function () {
     let hls = new Hls();
     assert.strictEqual(hls.abrController._bwEstimator, null);
   });
 
-  it('should return correct next auto level', () => {
+  it('should return correct next auto level', function () {
     let hls = new Hls({ maxStarvationDelay: 4 });
     hls.levelController._levels = [
       { bitrate: 105000, name: '144', details: { totalduration: 4, fragments: [{}] } },
diff --git a/tests/unit/hls.js b/tests/unit/hls.js
index 047570406af..d55c890bb2e 100644
--- a/tests/unit/hls.js
+++ b/tests/unit/hls.js
@@ -2,8 +2,8 @@ import Hls from '../../src/hls';
 
 const assert = require('assert');
 
-describe('Hls', () => {
-  it('should return a bandwidth estimate if the estimator exists', () => {
+describe('Hls', function () {
+  it('should return a bandwidth estimate if the estimator exists', function () {
     const MOCKED_ESTIMATE = 2000;
     const hls = new Hls();
     hls.abrController = {
@@ -14,7 +14,7 @@ describe('Hls', () => {
     assert.strictEqual(hls.bandwidthEstimate, MOCKED_ESTIMATE);
   });
 
-  it('should return NaN if the estimator does not exist', () => {
+  it('should return NaN if the estimator does not exist', function () {
     const hls = new Hls();
     assert.strictEqual(isNaN(hls.bandwidthEstimate), true);
   });

From 3fd4e2a051362c188f98fc22bed45ecd3164712f Mon Sep 17 00:00:00 2001
From: chun shang <springuper@gmail.com>
Date: Wed, 23 Jan 2019 00:24:35 +0800
Subject: [PATCH 15/59] Increase BufferHelper test coverage to 100% (#2052)

---
 tests/unit/utils/buffer-helper.js | 220 ++++++++++++++++++++++++------
 1 file changed, 179 insertions(+), 41 deletions(-)

diff --git a/tests/unit/utils/buffer-helper.js b/tests/unit/utils/buffer-helper.js
index 767fde0e19c..8240927abb6 100644
--- a/tests/unit/utils/buffer-helper.js
+++ b/tests/unit/utils/buffer-helper.js
@@ -12,8 +12,8 @@ function createMockBuffer (buffered) {
 
 describe('BufferHelper', function () {
   describe('isBuffered', function () {
-    // |////////|__________|////////////////|
-    // 0       0.5         1               2.0
+    // |////////|________|////////////////|
+    // 0       0.5       1                2
     const media = {
       get buffered () {
         return createMockBuffer([
@@ -23,20 +23,12 @@ describe('BufferHelper', function () {
           },
           {
             startPTS: 1,
-            endPTS: 2.0
+            endPTS: 2
           }
         ]);
       }
     };
 
-    it('should return true if media.buffered throw error', function () {
-      const invalidMedia = {
-        get buffered () {
-          throw new Error('InvalidStateError');
-        }
-      };
-      assert.equal(BufferHelper.isBuffered(invalidMedia, 0), false);
-    });
     it('should return true if some media.buffered includes the position', function () {
       assert.equal(BufferHelper.isBuffered(media, 0), true);
       assert.equal(BufferHelper.isBuffered(media, 0.1), true);
@@ -50,11 +42,22 @@ describe('BufferHelper', function () {
       assert.equal(BufferHelper.isBuffered(media, 0.9), false);
       assert.equal(BufferHelper.isBuffered(media, 2.1), false);
     });
+    it('should return false if media.buffered throws error', function () {
+      const invalidMedia = {
+        get buffered () {
+          throw new Error('InvalidStateError');
+        }
+      };
+      assert.equal(BufferHelper.isBuffered(invalidMedia, 0), false);
+    });
+    it('should return false if media does not exist', function () {
+      assert.equal(BufferHelper.isBuffered(null, 0), false);
+    });
   });
   describe('bufferInfo', () => {
-    it('should return found buffer info when maxHoleDuration is 0', function () {
-      // |////////|__________|////////////////|
-      // 0       0.5         1               2.0
+    it('should return found buffer info if some media.buffered includes pos with allowed error', function () {
+      // |////////|________|////////////////|
+      // 0       0.5       1                2
       const media = {
         get buffered () {
           return createMockBuffer([
@@ -64,7 +67,7 @@ describe('BufferHelper', function () {
             },
             {
               startPTS: 1,
-              endPTS: 2.0
+              endPTS: 2
             }
           ]);
         }
@@ -76,70 +79,205 @@ describe('BufferHelper', function () {
         end: 0.5,
         nextStart: 1
       });
-      assert.deepEqual(BufferHelper.bufferInfo(media, 0.5, maxHoleDuration), {
+    });
+    it('should return empty buffer info if media does not exist', function () {
+      const invalidMedia = {
+        get buffered () {
+          throw new Error('InvalidStateError');
+        }
+      };
+      const maxHoleDuration = 0;
+      assert.deepEqual(BufferHelper.bufferInfo(invalidMedia, 0, maxHoleDuration), {
+        len: 0,
+        start: 0,
+        end: 0,
+        nextStart: undefined
+      });
+    });
+    it('should return empty buffer info if media does not exist', function () {
+      const maxHoleDuration = 0;
+      assert.deepEqual(BufferHelper.bufferInfo(null, 0, maxHoleDuration), {
+        len: 0,
+        start: 0,
+        end: 0,
+        nextStart: undefined
+      });
+    });
+  });
+  describe('bufferedInfo', () => {
+    it('should return found buffer info when maxHoleDuration is 0', function () {
+      // |////////|________|////////////////|
+      // 0       0.5       1                2
+      const buffered = [
+        {
+          start: 0,
+          end: 0.5
+        },
+        {
+          start: 1,
+          end: 2
+        }
+      ];
+      const maxHoleDuration = 0;
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration), {
+        len: 0.5,
+        start: 0,
+        end: 0.5,
+        nextStart: 1
+      });
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration), {
         len: 0,
         start: 0.5,
         end: 0.5,
         nextStart: 1
       });
-      assert.deepEqual(BufferHelper.bufferInfo(media, 1, maxHoleDuration), {
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 1, maxHoleDuration), {
         len: 1,
         start: 1,
         end: 2,
         nextStart: undefined
       });
-      assert.deepEqual(BufferHelper.bufferInfo(media, 2, maxHoleDuration), {
-        len: 0,
-        start: 2,
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 1.5, maxHoleDuration), {
+        len: 0.5,
+        start: 1,
         end: 2,
         nextStart: undefined
       });
     });
     it('should return found buffer info when maxHoleDuration is 0.5', function () {
-      // |////////|__________|////////////////|
-      // 0       0.5         1               2.0
-      const media = {
-        get buffered () {
-          return createMockBuffer([
-            {
-              startPTS: 0,
-              endPTS: 0.5
-            },
-            {
-              startPTS: 1,
-              endPTS: 2.0
-            }
-          ]);
+      // |////////|________|////////////////|
+      // 0       0.5       1                2
+      const buffered = [
+        {
+          start: 0,
+          end: 0.5
+        },
+        {
+          start: 1,
+          end: 2
         }
-      };
+      ];
       const maxHoleDuration = 0.5;
-      assert.deepEqual(BufferHelper.bufferInfo(media, 0, maxHoleDuration), {
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration), {
         len: 0.5,
         start: 0,
         end: 0.5,
         nextStart: 1
       });
       // M: maxHoleDuration: 0.5
-      // |////////|__________|////////////////|
-      // 0     0.5 --- M --- 1               2.0
-      assert.deepEqual(BufferHelper.bufferInfo(media, 0.5, maxHoleDuration), {
+      // |////////|________|////////////////|
+      // 0       0.5 - M - 1                2
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration), {
         len: 1.5,
         start: 1,
         end: 2,
         nextStart: undefined
       });
-      assert.deepEqual(BufferHelper.bufferInfo(media, 1, maxHoleDuration), {
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 1, maxHoleDuration), {
         len: 1,
         start: 1,
         end: 2,
         nextStart: undefined
       });
-      assert.deepEqual(BufferHelper.bufferInfo(media, 2, maxHoleDuration), {
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 2, maxHoleDuration), {
         len: 0,
         start: 2,
         end: 2,
         nextStart: undefined
       });
     });
+    it('should be able to handle unordered buffered', function () {
+      // |////////|________|////////////////|
+      // 0       0.5      1.0              2.0
+      const buffered = [
+        {
+          start: 1,
+          end: 2
+        },
+        {
+          start: 0,
+          end: 0.5
+        }
+      ];
+      const maxHoleDuration = 0.5;
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration), {
+        len: 0.5,
+        start: 0,
+        end: 0.5,
+        nextStart: 1
+      });
+    });
+    it('should be able to merge adjacent time ranges with a small hole', function () {
+      // |////////|________|////////////////|
+      // 0       0.5       1                2
+      const buffered = [
+        {
+          start: 0,
+          end: 0.5
+        },
+        {
+          start: 1,
+          end: 2
+        }
+      ];
+      const maxHoleDuration = 1;
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.8, maxHoleDuration), {
+        len: 1.2,
+        start: 0,
+        end: 2,
+        nextStart: undefined
+      });
+    });
+    it('should be able to merge overlapping time ranges', function () {
+      // |////////|________|
+      // |////////|////////|
+      // 0       0.5       1
+      const buffered = [
+        {
+          start: 0,
+          end: 0.5
+        },
+        {
+          start: 0,
+          end: 1
+        }
+      ];
+      const maxHoleDuration = 0.5;
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration), {
+        len: 0.5,
+        start: 0,
+        end: 1,
+        nextStart: undefined
+      });
+    });
+    it('should return empty buffered if pos is out of range', function () {
+      const buffered = [
+        {
+          start: 0,
+          end: 0.5
+        },
+        {
+          start: 0,
+          end: 1
+        }
+      ];
+      const maxHoleDuration = 0;
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 5, maxHoleDuration), {
+        len: 0,
+        start: 5,
+        end: 5,
+        nextStart: undefined
+      });
+    });
+    it('should return empty buffered if buffered is empty', function () {
+      const buffered = [];
+      const maxHoleDuration = 0;
+      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 5, maxHoleDuration), {
+        len: 0,
+        start: 5,
+        end: 5,
+        nextStart: undefined
+      });
+    });
   });
 });

From d8be3dcc2ceb6561853d0665e0b42ca71b53b946 Mon Sep 17 00:00:00 2001
From: chun shang <springuper@gmail.com>
Date: Wed, 23 Jan 2019 00:34:28 +0800
Subject: [PATCH 16/59] Increase adts.js test coverage to 100% (#2053)

* Increase adts.js test coverage to 100%
---
 src/demux/adts.js          |   5 +-
 tests/unit/demuxer/adts.js | 416 +++++++++++++++++++++++++++++++++++++
 2 files changed, 419 insertions(+), 2 deletions(-)
 create mode 100644 tests/unit/demuxer/adts.js

diff --git a/src/demux/adts.js b/src/demux/adts.js
index c4d7db5dd61..ccbac365fe5 100644
--- a/src/demux/adts.js
+++ b/src/demux/adts.js
@@ -1,5 +1,6 @@
 /**
- *  ADTS parser helper
+ * ADTS parser helper
+ * @link https://wiki.multimedia.cx/index.php?title=ADTS
  */
 import { logger } from '../utils/logger';
 import { ErrorTypes, ErrorDetails } from '../errors';
@@ -160,7 +161,7 @@ export function isHeader (data, offset) {
 export function probe (data, offset) {
   // same as isHeader but we also check that ADTS frame follows last ADTS frame
   // or end of data is reached
-  if (offset + 1 < data.length && isHeaderPattern(data, offset)) {
+  if (isHeader(data, offset)) {
     // ADTS header Length
     let headerLength = getHeaderLength(data, offset);
     // ADTS frame Length
diff --git a/tests/unit/demuxer/adts.js b/tests/unit/demuxer/adts.js
new file mode 100644
index 00000000000..636cd1aa6d8
--- /dev/null
+++ b/tests/unit/demuxer/adts.js
@@ -0,0 +1,416 @@
+import {
+  getAudioConfig, isHeaderPattern, getHeaderLength, getFullFrameLength, isHeader, probe,
+  initTrackConfig, getFrameDuration, parseFrameHeader, appendFrame
+} from '../../../src/demux/adts';
+import { ErrorTypes } from '../../../src/errors';
+
+const assert = require('assert');
+const sinon = require('sinon');
+
+describe('getAudioConfig', () => {
+  it('should trigger a MEDIA_ERROR event if sample index is invalid', () => {
+    const observer = {
+      trigger: sinon.spy()
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x34; // sampling_frequency_index = 14, which is a reserved value
+
+    assert.equal(getAudioConfig(observer, data, 0, 'mp4a.40.29'), undefined);
+    assert.ok(observer.trigger.calledOnce);
+    assert.equal(observer.trigger.args[0][1].type, ErrorTypes.MEDIA_ERROR);
+  });
+
+  it('should return audio config for firefox if the specified sampling frequency > 24kHz', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'firefox')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x00; // sampling_frequency_index = 0
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+      config: [16, 0],
+      samplerate: 96000,
+      channelCount: 0,
+      codec: 'mp4a.40.2',
+      manifestCodec: 'mp4a.40.29'
+    });
+  });
+
+  it('should return audio config with a different extension sampling index for Firefox if sampling freq is low', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Firefox')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+      config: [45, 3, 136, 0],
+      samplerate: 11025,
+      channelCount: 0,
+      codec: 'mp4a.40.5',
+      manifestCodec: 'mp4a.40.29'
+    });
+  });
+
+  it('should return audio config for Android', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Android')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+      config: [21, 0],
+      samplerate: 11025,
+      channelCount: 0,
+      codec: 'mp4a.40.2',
+      manifestCodec: 'mp4a.40.29'
+    });
+  });
+
+  it('should return audio config for Chrome', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+      config: [45, 3, 136, 0],
+      samplerate: 11025,
+      channelCount: 0,
+      codec: 'mp4a.40.5',
+      manifestCodec: 'mp4a.40.29'
+    });
+  });
+
+  it('should return audio config for Chrome if there is no audio codec', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+
+    assert.deepEqual(getAudioConfig(observer, data, 0), {
+      config: [45, 3, 136, 0],
+      samplerate: 11025,
+      channelCount: 0,
+      codec: 'mp4a.40.5',
+      manifestCodec: undefined
+    });
+  });
+
+  it('should return audio config for Chrome if there is no audio codec and freq is high enough', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x08; // sampling_frequency_index = 2
+
+    assert.deepEqual(getAudioConfig(observer, data, 0), {
+      config: [41, 1, 8, 0],
+      samplerate: 64000,
+      channelCount: 0,
+      codec: 'mp4a.40.5',
+      manifestCodec: undefined
+    });
+  });
+
+  it('should return audio config for Chrome if audio codec is "mp4a.40.5"', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.5'), {
+      config: [45, 3, 136, 0],
+      samplerate: 11025,
+      channelCount: 0,
+      codec: 'mp4a.40.5',
+      manifestCodec: 'mp4a.40.5'
+    });
+  });
+
+  it('should return audio config for Chrome if audio codec is "mp4a.40.2"', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+    data[3] = 0x40; // channel = 1
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.2'), {
+      config: [21, 8],
+      samplerate: 11025,
+      channelCount: 1,
+      codec: 'mp4a.40.2',
+      manifestCodec: 'mp4a.40.2'
+    });
+  });
+
+  it('should return audio config for Vivaldi', () => {
+    const observer = {
+      trigger: sinon.stub(navigator, 'userAgent').get(() => 'Vivaldi')
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x08; // sampling_frequency_index = 2
+
+    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.2'), {
+      config: [17, 0],
+      samplerate: 64000,
+      channelCount: 0,
+      codec: 'mp4a.40.2',
+      manifestCodec: 'mp4a.40.2'
+    });
+  });
+});
+
+describe('isHeaderPattern', () => {
+  it('should return true if the specified data slot is of header pattern', () => {
+    const data = new Uint8Array(new ArrayBuffer(16));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[14] = 0xff;
+    data[15] = 0xf9; // ID = 1 (MPEG-2), layer = 00, protection_absent = 1
+    assert.ok(isHeaderPattern(data, 0));
+    assert.ok(isHeaderPattern(data, 14));
+  });
+
+  it('should return false if the specific data is not of header pattern', () => {
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[1] = 0xff;
+    data[2] = 0xff;
+    assert.equal(isHeaderPattern(data, 0), false);
+    assert.equal(isHeaderPattern(data, 2), false);
+  });
+});
+
+describe('getHeaderLength', () => {
+  it('should return 7 if there is no CRC', () => {
+    const data = new Uint8Array(new ArrayBuffer(2));
+    data[0] = 0xff;
+    data[1] = 0xf9; // ID = 1 (MPEG-2), layer = 00, protection_absent = 1
+    assert.equal(getHeaderLength(data, 0), 7);
+  });
+
+  it('should return 9 if there is CRC', () => {
+    const data = new Uint8Array(new ArrayBuffer(2));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    assert.equal(getHeaderLength(data, 0), 9);
+  });
+});
+
+describe('getFullFrameLength', () => {
+  it('should extract frame_length field and return its value', () => {
+    const data = new Uint8Array(new ArrayBuffer(8));
+    data[0] = 0xff;
+    data[1] = 0xf9;
+    data[2] = 0x00;
+    data[3] = 0x02; // the last 2 bits belong to frame_length
+    data[4] = 0x00; // all 8 bits belong to frame_length
+    data[5] = 0xE0; // the first 3 bits belong to frame_length
+    assert.equal(getFullFrameLength(data, 0), 4103);
+  });
+});
+
+describe('isHeader', () => {
+  it('should return true if there are enough data and it is of header pattern', () => {
+    const data = new Uint8Array(new ArrayBuffer(8));
+    data[0] = 0xff;
+    data[1] = 0xf9;
+    assert.ok(isHeader(data, 0));
+  });
+
+  it('should return false if there are not enough data', () => {
+    const data = new Uint8Array(new ArrayBuffer(1));
+    assert.equal(isHeader(data, 0), false);
+  });
+
+  it('should return false if it is not of header pattern', () => {
+    const data = new Uint8Array(new ArrayBuffer(8));
+    assert.equal(isHeader(data, 0), false);
+  });
+});
+
+describe('probe', () => {
+  it('should return false if `isHeader` fails', () => {
+    const data = new Uint8Array(new ArrayBuffer(8));
+    assert.equal(probe(data, 0), false);
+  });
+
+  it('should return true if it contains the entire ADTS frame', () => {
+    const data = new Uint8Array(new ArrayBuffer(16));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+    assert.ok(probe(data, 0));
+  });
+
+  it('should return true if it contains an valid following frame header', () => {
+    const data = new Uint8Array(new ArrayBuffer(18));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+    data[16] = 0xff;
+    data[17] = 0xf0;
+    console.log('hahah');
+    assert.ok(probe(data, 0));
+  });
+
+  it('should return false if it contains the entire ADTS frame with an incomplete following header', () => {
+    const data = new Uint8Array(new ArrayBuffer(17));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+    assert.equal(probe(data, 0), false);
+  });
+
+  it('should return false if it contains the entire ADTS frame with an invalid following frame header', () => {
+    const data = new Uint8Array(new ArrayBuffer(18));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+    assert.equal(probe(data, 0), false);
+  });
+
+  it('should return false if it does not contain the entire header', () => {
+    const data = new Uint8Array(new ArrayBuffer(2));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    assert.equal(probe(data, 0), false);
+  });
+});
+
+describe('initTrackConfig', () => {
+  it('should do nothing with track if track.samplerate is defined', () => {
+    const track = {
+      samplerate: 64000
+    };
+    initTrackConfig(track);
+
+    assert.deepEqual(track, {
+      samplerate: 64000
+    });
+  });
+
+  it('should call `getAudioConfig` and change track if track.samplerate is undefined', () => {
+    const track = {};
+    const observer = {
+      trigger: sinon.spy()
+    };
+    const data = new Uint8Array(new ArrayBuffer(4));
+    data[0] = 0xff;
+    data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
+    data[2] = 0x28; // sampling_frequency_index = 10
+
+    initTrackConfig(track, observer, data, 0, 'mp4a.40.29');
+
+    assert.deepEqual(track, {
+      config: [45, 3, 136, 0],
+      samplerate: 11025,
+      channelCount: 0,
+      codec: 'mp4a.40.5',
+      manifestCodec: 'mp4a.40.29'
+    });
+  });
+});
+
+describe('getFrameDuration', () => {
+  it('should compute frame duration from sample rate', () => {
+    assert.equal(getFrameDuration(64000), 1440);
+  });
+});
+
+describe('parseFrameHeader', () => {
+  it('should return parsed result if data contains the entire frame', () => {
+    const data = new Uint8Array(new ArrayBuffer(16));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+    assert.deepEqual(parseFrameHeader(data, 0, 0, 0, 0), {
+      headerLength: 9,
+      frameLength: 7,
+      stamp: 0
+    });
+  });
+
+  it('should return undefined if there is only the header part', () => {
+    const data = new Uint8Array(new ArrayBuffer(9));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x01;
+    data[5] = 0x40; // frame_length is 9
+    assert.equal(parseFrameHeader(data, 0, 0, 0, 0), undefined);
+  });
+
+  it('should return undefined if data does not contain the entire frame', () => {
+    const data = new Uint8Array(new ArrayBuffer(12));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+    assert.equal(parseFrameHeader(data, 0, 0, 0, 0), undefined);
+  });
+});
+
+describe('appendFrame', () => {
+  it('should append the found sample to track and return some useful information', () => {
+    const track = {
+      samplerate: 64000,
+      samples: [],
+      len: 0
+    };
+    const data = new Uint8Array(new ArrayBuffer(16));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+
+    assert.deepEqual(appendFrame(track, data, 0, 0, 0), {
+      sample: {
+        unit: data.subarray(9, 16),
+        pts: 0,
+        dts: 0
+      },
+      length: 16
+    });
+    assert.equal(track.samples.length, 1);
+    assert.equal(track.len, 7);
+  });
+
+  it('should not append sample if `parseFrameHeader` fails', () => {
+    const track = {
+      samplerate: 64000,
+      samples: [],
+      len: 0
+    };
+    const data = new Uint8Array(new ArrayBuffer(12));
+    data[0] = 0xff;
+    data[1] = 0xf0; // protection_absent = 0
+    data[4] = 0x02; // frame_length is 16
+
+    assert.equal(appendFrame(track, data, 0, 0, 0), undefined);
+    assert.equal(track.samples.length, 0);
+    assert.equal(track.len, 0);
+  });
+});

From 4e2ae386241131bedb854c1f51193c253c0da994 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Thu, 10 Jan 2019 18:16:53 -0400
Subject: [PATCH 17/59] Convert eme-controller to TypeScript.

Added TypeScript types to the code.

Handled media detached and removing the encrypted event listener.
---
 .eslintrc.js                                  |   1 +
 .../{eme-controller.js => eme-controller.ts}  | 332 +++++++++---------
 2 files changed, 176 insertions(+), 157 deletions(-)
 rename src/controller/{eme-controller.js => eme-controller.ts} (56%)

diff --git a/.eslintrc.js b/.eslintrc.js
index db84e90afd4..70e5a613c8a 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,5 +1,6 @@
 module.exports = {
   'env': {
+    'browser': true,
     'commonjs': true,
     'es6': true
   },
diff --git a/src/controller/eme-controller.js b/src/controller/eme-controller.ts
similarity index 56%
rename from src/controller/eme-controller.js
rename to src/controller/eme-controller.ts
index d387ff9c487..176577d9bcc 100644
--- a/src/controller/eme-controller.js
+++ b/src/controller/eme-controller.ts
@@ -10,17 +10,15 @@ import { ErrorTypes, ErrorDetails } from '../errors';
 
 import { logger } from '../utils/logger';
 
-const { XMLHttpRequest } = window;
-
 const MAX_LICENSE_REQUEST_FAILURES = 3;
 
 /**
  * @see https://developer.mozilla.org/en-US/docs/Web/API/Navigator/requestMediaKeySystemAccess
  */
-const KeySystems = {
-  WIDEVINE: 'com.widevine.alpha',
-  PLAYREADY: 'com.microsoft.playready'
-};
+enum KeySystems {
+  WIDEVINE = 'com.widevine.alpha',
+  PLAYREADY = 'com.microsoft.playready',
+}
 
 /**
  * @see https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemConfiguration
@@ -30,20 +28,18 @@ const KeySystems = {
  * @returns {Array<MediaSystemConfiguration>} An array of supported configurations
  */
 
-const createWidevineMediaKeySystemConfigurations = function (audioCodecs, videoCodecs, drmSystemOptions) { /* jshint ignore:line */
-  const baseConfig = {
+const createWidevineMediaKeySystemConfigurations = function (audioCodecs: string[], videoCodecs: string[]): MediaKeySystemConfiguration[] { /* jshint ignore:line */
+  const baseConfig: MediaKeySystemConfiguration = {
     // initDataTypes: ['keyids', 'mp4'],
     // label: "",
     // persistentState: "not-allowed", // or "required" ?
     // distinctiveIdentifier: "not-allowed", // or "required" ?
     // sessionTypes: ['temporary'],
-    videoCapabilities: [
-      // { contentType: 'video/mp4; codecs="avc1.42E01E"' }
-    ]
+    videoCapabilities: [] // { contentType: 'video/mp4; codecs="avc1.42E01E"' }
   };
 
   videoCodecs.forEach((codec) => {
-    baseConfig.videoCapabilities.push({
+    baseConfig.videoCapabilities!.push({
       contentType: `video/mp4; codecs="${codec}"`
     });
   });
@@ -57,22 +53,31 @@ const createWidevineMediaKeySystemConfigurations = function (audioCodecs, videoC
  * The idea here is to handle key-system (and their respective platforms) specific configuration differences
  * in order to work with the local requestMediaKeySystemAccess method.
  *
- * We can also rule-out platform-related key-system support at this point by throwing an error or returning null.
+ * We can also rule-out platform-related key-system support at this point by throwing an error.
  *
  * @param {string} keySystem Identifier for the key-system, see `KeySystems` enum
  * @param {Array<string>} audioCodecs List of required audio codecs to support
  * @param {Array<string>} videoCodecs List of required video codecs to support
- * @returns {Array<MediaSystemConfiguration> | null} A non-empty Array of MediaKeySystemConfiguration objects or `null`
+ * @throws will throw an error if a unknown key system is passed
+ * @returns {Array<MediaSystemConfiguration>} A non-empty Array of MediaKeySystemConfiguration objects
  */
-const getSupportedMediaKeySystemConfigurations = function (keySystem, audioCodecs, videoCodecs) {
+const getSupportedMediaKeySystemConfigurations = function (keySystem: KeySystems, audioCodecs: string[], videoCodecs: string[]): MediaKeySystemConfiguration[] {
   switch (keySystem) {
   case KeySystems.WIDEVINE:
     return createWidevineMediaKeySystemConfigurations(audioCodecs, videoCodecs);
   default:
-    throw Error('Unknown key-system: ' + keySystem);
+    throw new Error(`Unknown key-system: ${keySystem}`);
   }
 };
 
+interface MediaKeysListItem {
+  mediaKeys?: MediaKeys,
+  mediaKeysSession?: MediaKeySession,
+  mediaKeysSessionInitialized: boolean;
+  mediaKeySystemAccess: MediaKeySystemAccess;
+  mediaKeySystemDomain: KeySystems;
+}
+
 /**
  * Controller to deal with encrypted media extensions (EME)
  * @see https://developer.mozilla.org/en-US/docs/Web/API/Encrypted_Media_Extensions_API
@@ -81,6 +86,16 @@ const getSupportedMediaKeySystemConfigurations = function (keySystem, audioCodec
  * @constructor
  */
 class EMEController extends EventHandler {
+  private _widevineLicenseUrl: string;
+  private _licenseXhrSetup: (xhr: XMLHttpRequest, url: string) => void;
+  private _emeEnabled: boolean;
+  private _requestMediaKeySystemAccess: (keySystem: KeySystems, supportedConfigurations: MediaKeySystemConfiguration[]) => Promise<MediaKeySystemAccess>
+
+  private _mediaKeysList: MediaKeysListItem[] = []
+  private _media: HTMLMediaElement | null = null;
+  private _hasSetMediaKeys: boolean = false;
+  private _requestLicenseFailureCount: number = 0;
+
   /**
      * @constructs
      * @param {Hls} hls Our Hls.js instance
@@ -94,44 +109,21 @@ class EMEController extends EventHandler {
     this._widevineLicenseUrl = hls.config.widevineLicenseUrl;
     this._licenseXhrSetup = hls.config.licenseXhrSetup;
     this._emeEnabled = hls.config.emeEnabled;
-
     this._requestMediaKeySystemAccess = hls.config.requestMediaKeySystemAccessFunc;
-
-    this._mediaKeysList = [];
-    this._media = null;
-
-    this._hasSetMediaKeys = false;
-    this._isMediaEncrypted = false;
-
-    this._requestLicenseFailureCount = 0;
   }
 
   /**
-     *
-     * @param {string} keySystem Identifier for the key-system, see `KeySystems` enum
-     * @returns {string} License server URL for key-system (if any configured, otherwise causes error)
-     */
-  getLicenseServerUrl (keySystem) {
-    let url;
+   * @param {string} keySystem Identifier for the key-system, see `KeySystems` enum
+   * @returns {string} License server URL for key-system (if any configured, otherwise causes error)
+   * @throws if a unsupported keysystem is passed
+   */
+  getLicenseServerUrl (keySystem: KeySystems): string {
     switch (keySystem) {
     case KeySystems.WIDEVINE:
-      url = this._widevineLicenseUrl;
-      break;
-    default:
-      url = null;
-      break;
-    }
-
-    if (!url) {
-      logger.error(`No license server URL configured for key-system "${keySystem}"`);
-      this.hls.trigger(Event.ERROR, {
-        type: ErrorTypes.KEY_SYSTEM_ERROR,
-        details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
-        fatal: true
-      });
+      return this._widevineLicenseUrl;
     }
 
-    return url;
+    throw new Error(`no license server URL configured for key-system "${keySystem}"`);
   }
 
   /**
@@ -140,17 +132,14 @@ class EMEController extends EventHandler {
      * @param {string} keySystem System ID (see `KeySystems`)
      * @param {Array<string>} audioCodecs List of required audio codecs to support
      * @param {Array<string>} videoCodecs List of required video codecs to support
+     * @throws When a unsupported KeySystem is passed
      */
-  _attemptKeySystemAccess (keySystem, audioCodecs, videoCodecs) {
+  private _attemptKeySystemAccess (keySystem: KeySystems, audioCodecs: string[], videoCodecs: string[]) {
     // TODO: add other DRM "options"
 
+    // This can throw, but is caught in event handler callpath
     const mediaKeySystemConfigs = getSupportedMediaKeySystemConfigurations(keySystem, audioCodecs, videoCodecs);
 
-    if (!mediaKeySystemConfigs) {
-      logger.warn('Can not create config for key-system (maybe because platform is not supported):', keySystem);
-      return;
-    }
-
     logger.log('Requesting encrypted media key-system access');
 
     // expecting interface like window.navigator.requestMediaKeySystemAccess
@@ -173,16 +162,14 @@ class EMEController extends EventHandler {
 
   /**
      * Handles obtaining access to a key-system
-     *
+     * @private
      * @param {string} keySystem
      * @param {MediaKeySystemAccess} mediaKeySystemAccess https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemAccess
      */
-  _onMediaKeySystemAccessObtained (keySystem, mediaKeySystemAccess) {
+  private _onMediaKeySystemAccessObtained (keySystem: KeySystems, mediaKeySystemAccess: MediaKeySystemAccess) {
     logger.log(`Access for key-system "${keySystem}" obtained`);
 
-    const mediaKeysListItem = {
-      mediaKeys: null,
-      mediaKeysSession: null,
+    const mediaKeysListItem: MediaKeysListItem = {
       mediaKeysSessionInitialized: false,
       mediaKeySystemAccess: mediaKeySystemAccess,
       mediaKeySystemDomain: keySystem
@@ -204,52 +191,68 @@ class EMEController extends EventHandler {
   }
 
   /**
-     * Handles key-creation (represents access to CDM). We are going to create key-sessions upon this
-     * for all existing keys where no session exists yet.
-     */
-  _onMediaKeysCreated () {
+   * Handles key-creation (represents access to CDM). We are going to create key-sessions upon this
+   * for all existing keys where no session exists yet.
+   *
+   * @private
+   */
+  private _onMediaKeysCreated () {
     // check for all key-list items if a session exists, otherwise, create one
     this._mediaKeysList.forEach((mediaKeysListItem) => {
       if (!mediaKeysListItem.mediaKeysSession) {
-        mediaKeysListItem.mediaKeysSession = mediaKeysListItem.mediaKeys.createSession();
+        // mediaKeys is definitely initialized here
+        mediaKeysListItem.mediaKeysSession = mediaKeysListItem.mediaKeys!.createSession();
         this._onNewMediaKeySession(mediaKeysListItem.mediaKeysSession);
       }
     });
   }
 
   /**
-     *
+     * @private
      * @param {*} keySession
      */
-  _onNewMediaKeySession (keySession) {
+  private _onNewMediaKeySession (keySession: MediaKeySession) {
     logger.log(`New key-system session ${keySession.sessionId}`);
 
-    keySession.addEventListener('message', (event) => {
+    keySession.addEventListener('message', (event: MediaKeyMessageEvent) => {
       this._onKeySessionMessage(keySession, event.message);
     }, false);
   }
 
-  _onKeySessionMessage (keySession, message) {
+  /**
+   * @private
+   * @param {MediaKeySession} keySession
+   * @param {ArrayBuffer} message
+   */
+  private _onKeySessionMessage (keySession: MediaKeySession, message: ArrayBuffer) {
     logger.log('Got EME message event, creating license request');
 
-    this._requestLicense(message, (data) => {
+    this._requestLicense(message, (data: ArrayBuffer) => {
       logger.log('Received license data, updating key-session');
       keySession.update(data);
     });
   }
 
-  _onMediaEncrypted (initDataType, initData) {
-    logger.log(`Media is encrypted using "${initDataType}" init data type`);
-
-    this._isMediaEncrypted = true;
-    this._mediaEncryptionInitDataType = initDataType;
-    this._mediaEncryptionInitData = initData;
+  /**
+   * @private
+   * @param {string} initDataType
+   * @param {ArrayBuffer|null} initData
+   */
+  private _onMediaEncrypted = (e: MediaEncryptedEvent) => {
+    logger.log(`Media is encrypted using "${e.initDataType}" init data type`);
 
     this._attemptSetMediaKeys();
-    this._generateRequestWithPreferredKeySession();
+    this._generateRequestWithPreferredKeySession(e.initDataType, e.initData);
   }
 
-  _attemptSetMediaKeys () {
+  /**
+   * @private
+   */
+  private _attemptSetMediaKeys () {
+    if (!this._media) {
+      throw new Error('Attempted to set mediaKeys without first attaching a media element');
+    }
+
     if (!this._hasSetMediaKeys) {
       // FIXME: see if we can/want/need-to really to deal with several potential key-sessions?
       const keysListItem = this._mediaKeysList[0];
@@ -270,7 +273,10 @@ class EMEController extends EventHandler {
     }
   }
 
-  _generateRequestWithPreferredKeySession () {
+  /**
+   * @private
+   */
+  private _generateRequestWithPreferredKeySession (initDataType: string, initData: ArrayBuffer | null) {
     // FIXME: see if we can/want/need-to really to deal with several potential key-sessions?
     const keysListItem = this._mediaKeysList[0];
     if (!keysListItem) {
@@ -296,13 +302,10 @@ class EMEController extends EventHandler {
         details: ErrorDetails.KEY_SYSTEM_NO_SESSION,
         fatal: true
       });
+      return;
     }
 
-    const initDataType = this._mediaEncryptionInitDataType;
-    const initData = this._mediaEncryptionInitData;
-
     logger.log(`Generating key-session request for "${initDataType}" init data type`);
-
     keysListItem.mediaKeysSessionInitialized = true;
 
     keySession.generateRequest(initDataType, initData)
@@ -320,12 +323,14 @@ class EMEController extends EventHandler {
   }
 
   /**
-     * @param {string} url License server URL
-     * @param {ArrayBuffer} keyMessage Message data issued by key-system
-     * @param {function} callback Called when XHR has succeeded
-     * @returns {XMLHttpRequest} Unsent (but opened state) XHR object
-     */
-  _createLicenseXhr (url, keyMessage, callback) {
+   * @private
+   * @param {string} url License server URL
+   * @param {ArrayBuffer} keyMessage Message data issued by key-system
+   * @param {function} callback Called when XHR has succeeded
+   * @returns {XMLHttpRequest} Unsent (but opened state) XHR object
+   * @throws if XMLHttpRequest construction failed
+   */
+  private _createLicenseXhr (url: string, keyMessage: ArrayBuffer, callback: (data: ArrayBuffer) => void): XMLHttpRequest {
     const xhr = new XMLHttpRequest();
     const licenseXhrSetup = this._licenseXhrSetup;
 
@@ -345,15 +350,10 @@ class EMEController extends EventHandler {
       }
     } catch (e) {
       // IE11 throws an exception on xhr.open if attempting to access an HTTP resource over HTTPS
-      logger.error('Error setting up key-system license XHR', e);
-      this.hls.trigger(Event.ERROR, {
-        type: ErrorTypes.KEY_SYSTEM_ERROR,
-        details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
-        fatal: true
-      });
-      return;
+      throw new Error(`issue setting up KeySystem license XHR ${e}`);
     }
 
+    // Because we set responseType to ArrayBuffer here, callback is typed as handling only array buffers
     xhr.responseType = 'arraybuffer';
     xhr.onreadystatechange =
         this._onLicenseRequestReadyStageChange.bind(this, xhr, url, keyMessage, callback);
@@ -361,82 +361,88 @@ class EMEController extends EventHandler {
   }
 
   /**
-     * @param {XMLHttpRequest} xhr
-     * @param {string} url License server URL
-     * @param {ArrayBuffer} keyMessage Message data issued by key-system
-     * @param {function} callback Called when XHR has succeeded
-     *
-     */
-  _onLicenseRequestReadyStageChange (xhr, url, keyMessage, callback) {
+   * @private
+   * @param {XMLHttpRequest} xhr
+   * @param {string} url License server URL
+   * @param {ArrayBuffer} keyMessage Message data issued by key-system
+   * @param {function} callback Called when XHR has succeeded
+   */
+  private _onLicenseRequestReadyStageChange (xhr: XMLHttpRequest, url: string, keyMessage: ArrayBuffer, callback: (data: ArrayBuffer) => void) {
     switch (xhr.readyState) {
     case 4:
       if (xhr.status === 200) {
         this._requestLicenseFailureCount = 0;
         logger.log('License request succeeded');
+
+        if (xhr.responseType !== 'arraybuffer') {
+          logger.warn('xhr response type was not set to the expected arraybuffer for license request');
+        }
         callback(xhr.response);
       } else {
         logger.error(`License Request XHR failed (${url}). Status: ${xhr.status} (${xhr.statusText})`);
-
         this._requestLicenseFailureCount++;
-        if (this._requestLicenseFailureCount <= MAX_LICENSE_REQUEST_FAILURES) {
-          const attemptsLeft = MAX_LICENSE_REQUEST_FAILURES - this._requestLicenseFailureCount + 1;
-          logger.warn(`Retrying license request, ${attemptsLeft} attempts left`);
-          this._requestLicense(keyMessage, callback);
+        if (this._requestLicenseFailureCount > MAX_LICENSE_REQUEST_FAILURES) {
+          this.hls.trigger(Event.ERROR, {
+            type: ErrorTypes.KEY_SYSTEM_ERROR,
+            details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
+            fatal: true
+          });
           return;
         }
 
-        this.hls.trigger(Event.ERROR, {
-          type: ErrorTypes.KEY_SYSTEM_ERROR,
-          details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
-          fatal: true
-        });
+        const attemptsLeft = MAX_LICENSE_REQUEST_FAILURES - this._requestLicenseFailureCount + 1;
+        logger.warn(`Retrying license request, ${attemptsLeft} attempts left`);
+        this._requestLicense(keyMessage, callback);
       }
       break;
     }
   }
 
   /**
-     * @param {object} keysListItem
-     * @param {ArrayBuffer} keyMessage
-     * @returns {ArrayBuffer} Challenge data posted to license server
-     */
-  _generateLicenseRequestChallenge (keysListItem, keyMessage) {
-    let challenge;
-
-    if (keysListItem.mediaKeySystemDomain === KeySystems.PLAYREADY) {
-      logger.error('PlayReady is not supported (yet)');
-
-      // from https://github.com/MicrosoftEdge/Demos/blob/master/eme/scripts/demo.js
-      /*
-        if (this.licenseType !== this.LICENSE_TYPE_WIDEVINE) {
-            // For PlayReady CDMs, we need to dig the Challenge out of the XML.
-            var keyMessageXml = new DOMParser().parseFromString(String.fromCharCode.apply(null, new Uint16Array(keyMessage)), 'application/xml');
-            if (keyMessageXml.getElementsByTagName('Challenge')[0]) {
-                challenge = atob(keyMessageXml.getElementsByTagName('Challenge')[0].childNodes[0].nodeValue);
-            } else {
-                throw 'Cannot find <Challenge> in key message';
-            }
-            var headerNames = keyMessageXml.getElementsByTagName('name');
-            var headerValues = keyMessageXml.getElementsByTagName('value');
-            if (headerNames.length !== headerValues.length) {
-                throw 'Mismatched header <name>/<value> pair in key message';
-            }
-            for (var i = 0; i < headerNames.length; i++) {
-                xhr.setRequestHeader(headerNames[i].childNodes[0].nodeValue, headerValues[i].childNodes[0].nodeValue);
-            }
+   * @private
+   * @param {MediaKeysListItem} keysListItem
+   * @param {ArrayBuffer} keyMessage
+   * @returns {ArrayBuffer} Challenge data posted to license server
+   * @throws if KeySystem is unsupported
+   */
+  private _generateLicenseRequestChallenge (keysListItem: MediaKeysListItem, keyMessage: ArrayBuffer): ArrayBuffer {
+    switch (keysListItem.mediaKeySystemDomain) {
+    // case KeySystems.PLAYREADY:
+    // from https://github.com/MicrosoftEdge/Demos/blob/master/eme/scripts/demo.js
+    /*
+      if (this.licenseType !== this.LICENSE_TYPE_WIDEVINE) {
+        // For PlayReady CDMs, we need to dig the Challenge out of the XML.
+        var keyMessageXml = new DOMParser().parseFromString(String.fromCharCode.apply(null, new Uint16Array(keyMessage)), 'application/xml');
+        if (keyMessageXml.getElementsByTagName('Challenge')[0]) {
+            challenge = atob(keyMessageXml.getElementsByTagName('Challenge')[0].childNodes[0].nodeValue);
+        } else {
+            throw 'Cannot find <Challenge> in key message';
+        }
+        var headerNames = keyMessageXml.getElementsByTagName('name');
+        var headerValues = keyMessageXml.getElementsByTagName('value');
+        if (headerNames.length !== headerValues.length) {
+            throw 'Mismatched header <name>/<value> pair in key message';
         }
-        */
-    } else if (keysListItem.mediaKeySystemDomain === KeySystems.WIDEVINE) {
+        for (var i = 0; i < headerNames.length; i++) {
+            xhr.setRequestHeader(headerNames[i].childNodes[0].nodeValue, headerValues[i].childNodes[0].nodeValue);
+        }
+      }
+      break;
+    */
+    case KeySystems.WIDEVINE:
       // For Widevine CDMs, the challenge is the keyMessage.
-      challenge = keyMessage;
-    } else {
-      logger.error('Unsupported key-system:', keysListItem.mediaKeySystemDomain);
+      return keyMessage;
     }
 
-    return challenge;
+    throw new Error(`unsupported key-system: ${keysListItem.mediaKeySystemDomain}`);
   }
 
-  _requestLicense (keyMessage, callback) {
+  /**
+   * @private
+   * @param keyMessage
+   * @param callback
+   */
+  private _requestLicense (keyMessage: ArrayBuffer, callback: (data: ArrayBuffer) => void) {
     logger.log('Requesting content license for key-system');
 
     const keysListItem = this._mediaKeysList[0];
@@ -450,15 +456,23 @@ class EMEController extends EventHandler {
       return;
     }
 
-    const url = this.getLicenseServerUrl(keysListItem.mediaKeySystemDomain);
-    const xhr = this._createLicenseXhr(url, keyMessage, callback);
-
-    logger.log(`Sending license request to URL: ${url}`);
-
-    xhr.send(this._generateLicenseRequestChallenge(keysListItem, keyMessage));
+    try {
+      const url = this.getLicenseServerUrl(keysListItem.mediaKeySystemDomain);
+      const xhr = this._createLicenseXhr(url, keyMessage, callback);
+      logger.log(`Sending license request to URL: ${url}`);
+      const challenge = this._generateLicenseRequestChallenge(keysListItem, keyMessage);
+      xhr.send(challenge);
+    } catch (e) {
+      logger.error(`Failure requesting DRM license: ${e}`);
+      this.hls.trigger(Event.ERROR, {
+        type: ErrorTypes.KEY_SYSTEM_ERROR,
+        details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
+        fatal: true
+      });
+    }
   }
 
-  onMediaAttached (data) {
+  onMediaAttached (data: { media: HTMLMediaElement; }) {
     if (!this._emeEnabled) {
       return;
     }
@@ -468,14 +482,18 @@ class EMEController extends EventHandler {
     // keep reference of media
     this._media = media;
 
-    // FIXME: also handle detaching media !
+    media.addEventListener('encrypted', this._onMediaEncrypted);
+  }
 
-    media.addEventListener('encrypted', (e) => {
-      this._onMediaEncrypted(e.initDataType, e.initData);
-    });
+  onMediaDetached () {
+    if (this._media) {
+      this._media.removeEventListener('encrypted', this._onMediaEncrypted);
+      this._media = null; // release reference
+    }
   }
 
-  onManifestParsed (data) {
+  // TODO: Use manifest types here when they are defined
+  onManifestParsed (data: any) {
     if (!this._emeEnabled) {
       return;
     }

From 63db40fc87f05c850bcae23a4a0b4b461d836547 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <1956521+itsjamie@users.noreply.github.com>
Date: Wed, 23 Jan 2019 04:53:22 -0400
Subject: [PATCH 18/59] Listen to media detached

Clears the encrypted event listener from the HTMLMediaElement in controller, and releases the stored reference.
---
 src/controller/eme-controller.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/controller/eme-controller.ts b/src/controller/eme-controller.ts
index 176577d9bcc..df27575d5bc 100644
--- a/src/controller/eme-controller.ts
+++ b/src/controller/eme-controller.ts
@@ -103,6 +103,7 @@ class EMEController extends EventHandler {
   constructor (hls) {
     super(hls,
       Event.MEDIA_ATTACHED,
+      Event.MEDIA_DETACHED,
       Event.MANIFEST_PARSED
     );
 

From 3e43bf90da712a00260b7bac84a2d9f099c50833 Mon Sep 17 00:00:00 2001
From: beraliv <beraliv.spb@gmail.com>
Date: Thu, 24 Jan 2019 00:42:51 +0300
Subject: [PATCH 19/59] Choose bitrate in Bps (#2091)

Simplify bandwidth calculation by making; change docs to correctly reference bandwidth in bits/s
---
 docs/API.md                           |  8 ++++----
 src/utils/ewma-bandwidth-estimator.js | 13 +++++++------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/docs/API.md b/docs/API.md
index 50c39716695..e389d920df6 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -652,7 +652,7 @@ Note: If `fLoader` or `pLoader` are used, they overwrite `loader`!
       @param stats.tfirst {number} - performance.now() of first received byte
       @param stats.tload {number} - performance.now() on load complete
       @param stats.loaded {number} - nb of loaded bytes
-      @param [stats.bw] {number} - download bandwidth in bit/s
+      @param [stats.bw] {number} - download bandwidth in bits/s
       @param stats.total {number} - total nb of bytes
       @param context {object} - loader context
       @param networkDetails {object} - loader network details (the xhr for default loaders)
@@ -663,7 +663,7 @@ Note: If `fLoader` or `pLoader` are used, they overwrite `loader`!
       @param stats.tfirst {number} - performance.now() of first received byte
       @param stats.loaded {number} - nb of loaded bytes
       @param [stats.total] {number} - total nb of bytes
-      @param [stats.bw] {number} - current download bandwidth in bit/s (monitored by ABR controller to control emergency switch down)
+      @param [stats.bw] {number} - current download bandwidth in bits/s (monitored by ABR controller to control emergency switch down)
       @param context {object} - loader context
       @param data {string/arraybuffer/sharedarraybuffer} - onProgress data (should be defined only if context.progressData === true)
       @param networkDetails {object} - loader network details (the xhr for default loaders)
@@ -939,7 +939,7 @@ parameter should be a float greater than [abrEwmaFastVoD](#abrewmafastvod)
 
 (default: `500000`)
 
-Default bandwidth estimate in bits/second prior to collecting fragment bandwidth samples.
+Default bandwidth estimate in bits/s prior to collecting fragment bandwidth samples.
 
 parameter should be a float
 
@@ -1056,7 +1056,7 @@ Default value is `-1` (no level capping).
 
 ### `hls.bandwidthEstimate`
 
-get: Returns the current bandwidth estimate, in Kb/s, if available. Otherwise, `NaN` is returned.
+get: Returns the current bandwidth estimate in bits/s, if available. Otherwise, `NaN` is returned.
 
 ## Version Control
 
diff --git a/src/utils/ewma-bandwidth-estimator.js b/src/utils/ewma-bandwidth-estimator.js
index 0f20f16e50a..0f350758a86 100644
--- a/src/utils/ewma-bandwidth-estimator.js
+++ b/src/utils/ewma-bandwidth-estimator.js
@@ -20,12 +20,13 @@ class EwmaBandWidthEstimator {
 
   sample (durationMs, numBytes) {
     durationMs = Math.max(durationMs, this.minDelayMs_);
-    let bandwidth = 8000 * numBytes / durationMs,
-      // console.log('instant bw:'+ Math.round(bandwidth));
-      // we weight sample using loading duration....
-      weight = durationMs / 1000;
-    this.fast_.sample(weight, bandwidth);
-    this.slow_.sample(weight, bandwidth);
+    let numBits = 8 * numBytes,
+      // weight is duration in seconds
+      durationS = durationMs / 1000,
+      // value is bandwidth in bits/s
+      bandwidthInBps = numBits / durationS;
+    this.fast_.sample(durationS, bandwidthInBps);
+    this.slow_.sample(durationS, bandwidthInBps);
   }
 
   canEstimate () {

From 86b4e15d53d7d985b2c0ed056319e807abe543bc Mon Sep 17 00:00:00 2001
From: John Bartos <jbartos7@gmail.com>
Date: Fri, 25 Jan 2019 18:29:37 -0500
Subject: [PATCH 20/59] Upgrade tests to Chai BDD & optimize runner (#2037)

* Convert tests to Chai BDD

* Invoke mocha with exit so that travis doesnt hang on func test completion
---
 karma.conf.js                                 |   19 +-
 package-lock.json                             | 9691 ++++++++---------
 package.json                                  |   34 +-
 tests/.eslintrc.js                            |   30 +-
 tests/functional/auto/setup.js                |   17 +-
 tests/index.js                                |    4 +
 tests/unit/controller/abr-controller.js       |    6 +-
 .../unit/controller/audio-track-controller.js |  187 +-
 .../unit/controller/base-stream-controller.js |   15 +-
 tests/unit/controller/buffer-controller.js    |   65 +-
 tests/unit/controller/cap-level-controller.js |   57 +-
 tests/unit/controller/check-buffer.js         |    0
 tests/unit/controller/eme-controller.js       |   40 +-
 .../controller/ewma-bandwidth-estimator.js    |   32 +-
 tests/unit/controller/fragment-finders.js     |   59 +-
 tests/unit/controller/fragment-tracker.js     |  106 +-
 tests/unit/controller/gap-controller.js       |   55 +-
 tests/unit/controller/level-controller.js     |  181 +-
 tests/unit/controller/level-helper.js         |    0
 tests/unit/controller/stream-controller.js    |  101 +-
 .../controller/subtitle-stream-controller.js  |   54 +-
 .../controller/subtitle-track-controller.js   |   76 +-
 tests/unit/controller/timeline-controller.js  |   74 +-
 tests/unit/crypt/aes-decryptor.js             |   21 +-
 tests/unit/demuxer/adts.js                    |  165 +-
 tests/unit/demuxer/demuxer.js                 |  105 +-
 tests/unit/dummy.js                           |    8 -
 tests/unit/events.js                          |    3 +-
 tests/unit/hls.js                             |    6 +-
 tests/unit/loader/fragment.js                 |    9 +-
 tests/unit/loader/level.js                    |    7 +-
 tests/unit/loader/playlist-loader.js          |  555 +-
 tests/unit/utils/attr-list.js                 |  188 +-
 tests/unit/utils/binary-search.js             |    5 +-
 tests/unit/utils/buffer-helper.js             |   64 +-
 tests/unit/utils/discontinuities.js           |   28 +-
 tests/unit/utils/output-filter.js             |   54 +-
 37 files changed, 5517 insertions(+), 6604 deletions(-)
 create mode 100644 tests/index.js
 create mode 100644 tests/unit/controller/check-buffer.js
 create mode 100644 tests/unit/controller/level-helper.js
 delete mode 100644 tests/unit/dummy.js

diff --git a/karma.conf.js b/karma.conf.js
index 6b0940eed1c..e7b457d6582 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -5,18 +5,18 @@ const pkgJson = require('./package.json');
 const webpack = require('webpack');
 const path = require('path');
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     // base path that will be used to resolve all patterns (eg. files, exclude)
     basePath: '',
 
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['mocha', 'sinon', 'should'],
+    frameworks: ['mocha', 'sinon-chai'],
 
     // list of files / patterns to load in the browser
     files: [
-      'tests/unit/**/*.js'
+      'tests/index.js'
     ],
 
     // list of files to exclude
@@ -24,8 +24,9 @@ module.exports = function(config) {
 
     // preprocess matching files before serving them to the browser
     // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
+    // node_modules must not be webpacked or else Karma will fail to load frameworks
     preprocessors: {
-      'tests/**/*.js': ['webpack', 'sourcemap']
+      'tests/index.js': ['webpack', 'sourcemap']
     },
 
     // test results reporter to use
@@ -43,20 +44,18 @@ module.exports = function(config) {
       devtool: 'inline-source-map',
       resolve: {
         extensions: ['.ts', '.js']
-      },
-      module: {
+      },module: {
         rules: [
           {
             test: /\.(ts|js)$/,
             include: path.resolve(__dirname, 'src'),
             exclude: path.resolve(__dirname, 'node_modules'),
             loader: 'ts-loader'
-          },
-          // instrument only testing sources with Istanbul
+          },// instrument only testing sources with Istanbul
           {
             test: /\.(ts|js)$/,
-            exclude: path.resolve(__dirname, 'node_modules'),
-            enforce: 'post',
+
+            exclude: path.resolve(__dirname, 'node_modules'),enforce: 'post',
             use: [
               {
                 loader: 'istanbul-instrumenter-loader',
diff --git a/package-lock.json b/package-lock.json
index 6df348cc3d4..91ac0cc4502 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3,6 +3,213 @@
   "requires": true,
   "lockfileVersion": 1,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "7.0.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.0.tgz",
+      "integrity": "sha512-dZTwMvTgWfhmibq4V9X+LMf6Bgl7zAodRn9PvcPdhlzFMbvUutx74dbEv7Atz3ToeEpevYEJtAwfxq/bDCzHWg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.3.0",
+        "jsesc": "2.5.2",
+        "lodash": "4.17.11",
+        "source-map": "0.5.7",
+        "trim-right": "1.0.1"
+      },
+      "dependencies": {
+        "jsesc": {
+          "version": "2.5.2",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
+          "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
+          "dev": true
+        },
+        "lodash": {
+          "version": "4.17.11",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+      "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "7.0.0",
+        "@babel/template": "7.2.2",
+        "@babel/types": "7.3.0"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+      "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.3.0"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0.tgz",
+      "integrity": "sha512-MXkOJqva62dfC0w85mEf/LucPPS/1+04nmmRMPEBUB++hiiThQ2zPtX/mEWQ3mtzCEjIJvPY8nuwxXtQeQwUag==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.3.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "dev": true,
+      "requires": {
+        "chalk": "2.4.2",
+        "esutils": "2.0.2",
+        "js-tokens": "4.0.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "3.2.1",
+            "escape-string-regexp": "1.0.5",
+            "supports-color": "5.5.0"
+          }
+        },
+        "has-flag": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
+        },
+        "js-tokens": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
+          "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
+          "requires": {
+            "has-flag": "3.0.0"
+          }
+        }
+      }
+    },
+    "@babel/parser": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.3.1.tgz",
+      "integrity": "sha512-ATz6yX/L8LEnC3dtLQnIx4ydcPxhLcoy9Vl6re00zb2w5lG6itY6Vhnr1KFRPq/FHNsgl/gh2mjNN20f9iJTTA==",
+      "dev": true
+    },
+    "@babel/template": {
+      "version": "7.2.2",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.2.2.tgz",
+      "integrity": "sha512-zRL0IMM02AUDwghf5LMSSDEz7sBCO2YnNmpg3uWTZj/v1rcG2BmQUvaGU8GhU8BvfMh1k2KIAYZ7Ji9KXPUg7g==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.0.0",
+        "@babel/parser": "7.3.1",
+        "@babel/types": "7.3.0"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.2.3.tgz",
+      "integrity": "sha512-Z31oUD/fJvEWVR0lNZtfgvVt512ForCTNKYcJBGbPb1QZfve4WGH8Wsy7+Mev33/45fhP/hwQtvgusNdcCMgSw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.0.0",
+        "@babel/generator": "7.3.0",
+        "@babel/helper-function-name": "7.1.0",
+        "@babel/helper-split-export-declaration": "7.0.0",
+        "@babel/parser": "7.3.1",
+        "@babel/types": "7.3.0",
+        "debug": "4.1.1",
+        "globals": "11.10.0",
+        "lodash": "4.17.11"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
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+          "dev": true,
+          "requires": {
+            "ms": "2.1.1"
+          }
+        },
+        "globals": {
+          "version": "11.10.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-11.10.0.tgz",
+          "integrity": "sha512-0GZF1RiPKU97IHUO5TORo9w1PwrH/NBPl+fS7oMLdaTRiYmYbwK4NWoZWrAdd0/abG9R2BU+OiwyQpTpE6pdfQ==",
+          "dev": true
+        },
+        "lodash": {
+          "version": "4.17.11",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+          "dev": true
+        },
+        "ms": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
+          "dev": true
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.3.0.tgz",
+      "integrity": "sha512-QkFPw68QqWU1/RVPyBe8SO7lXbPfjtqAxRYQKpFpaB8yMq7X2qAqfwK5LKoQufEkSmO5NQ70O6Kc3Afk03RwXw==",
+      "dev": true,
+      "requires": {
+        "esutils": "2.0.2",
+        "lodash": "4.17.11",
+        "to-fast-properties": "2.0.0"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.11",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+          "dev": true
+        },
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
+      }
+    },
     "@iarna/toml": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.1.tgz",
@@ -21,9 +228,9 @@
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       "dev": true,
       "requires": {
-        "ansi-styles": "^3.2.1",
-        "supports-color": "^5.4.0",
-        "tslib": "^1"
+        "ansi-styles": "3.2.1",
+        "supports-color": "5.5.0",
+        "tslib": "1.9.3"
       },
       "dependencies": {
         "ansi-styles": {
@@ -32,7 +239,7 @@
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           "dev": true,
           "requires": {
-            "color-convert": "^1.9.0"
+            "color-convert": "1.9.0"
           }
         },
         "has-flag": {
@@ -47,7 +254,7 @@
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           "dev": true,
           "requires": {
-            "has-flag": "^3.0.0"
+            "has-flag": "3.0.0"
           }
         }
       }
@@ -58,10 +265,10 @@
       "integrity": "sha512-XBj13dw13qrRzUfAc4d6b8PlZXALFglJ8xydX34aazLJCzeP8mtTcAJTi6ylTwWVhIW2HDO9npTd4FviDY279g==",
       "dev": true,
       "requires": {
-        "@oclif/errors": "^1.2.2",
-        "@oclif/parser": "^3.7.0",
-        "debug": "^4.1.0",
-        "semver": "^5.6.0"
+        "@oclif/errors": "1.2.2",
+        "@oclif/parser": "3.7.0",
+        "debug": "4.1.0",
+        "semver": "5.6.0"
       },
       "dependencies": {
         "debug": {
@@ -70,7 +277,7 @@
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           "dev": true,
           "requires": {
-            "ms": "^2.1.1"
+            "ms": "2.1.1"
           }
         },
         "ms": {
@@ -93,8 +300,8 @@
       "integrity": "sha512-R9HJvS7x4Ff/VFGlg8b7hxFnuC77y7znr1iXwRay4Jhd/EFJyZRT9d9SHzA6TS8lz9vDTW93xOFakT9AXld4Kg==",
       "dev": true,
       "requires": {
-        "debug": "^4.1.0",
-        "tslib": "^1.9.3"
+        "debug": "4.1.0",
+        "tslib": "1.9.3"
       },
       "dependencies": {
         "debug": {
@@ -103,7 +310,7 @@
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           "dev": true,
           "requires": {
-            "ms": "^2.1.1"
+            "ms": "2.1.1"
           }
         },
         "ms": {
@@ -120,11 +327,11 @@
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       "dev": true,
       "requires": {
-        "clean-stack": "^1.3.0",
-        "fs-extra": "^7.0.0",
-        "indent-string": "^3.2.0",
-        "strip-ansi": "^5.0.0",
-        "wrap-ansi": "^4.0.0"
+        "clean-stack": "1.3.0",
+        "fs-extra": "7.0.1",
+        "indent-string": "3.2.0",
+        "strip-ansi": "5.0.0",
+        "wrap-ansi": "4.0.0"
       },
       "dependencies": {
         "ansi-regex": {
@@ -139,7 +346,7 @@
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           "dev": true,
           "requires": {
-            "color-convert": "^1.9.0"
+            "color-convert": "1.9.0"
           }
         },
         "fs-extra": {
@@ -148,9 +355,9 @@
           "integrity": "sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==",
           "dev": true,
           "requires": {
-            "graceful-fs": "^4.1.2",
-            "jsonfile": "^4.0.0",
-            "universalify": "^0.1.0"
+            "graceful-fs": "4.1.11",
+            "jsonfile": "4.0.0",
+            "universalify": "0.1.1"
           }
         },
         "indent-string": {
@@ -165,7 +372,7 @@
           "integrity": "sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=",
           "dev": true,
           "requires": {
-            "graceful-fs": "^4.1.6"
+            "graceful-fs": "4.1.11"
           }
         },
         "strip-ansi": {
@@ -174,7 +381,7 @@
           "integrity": "sha512-Uu7gQyZI7J7gn5qLn1Np3G9vcYGTVqB+lFTytnDJv83dd8T22aGH451P3jueT2/QemInJDfxHB5Tde5OzgG1Ow==",
           "dev": true,
           "requires": {
-            "ansi-regex": "^4.0.0"
+            "ansi-regex": "4.0.0"
           }
         },
         "wrap-ansi": {
@@ -183,9 +390,9 @@
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           "requires": {
-            "ansi-styles": "^3.2.0",
-            "string-width": "^2.1.1",
-            "strip-ansi": "^4.0.0"
+            "ansi-styles": "3.2.1",
+            "string-width": "2.1.1",
+            "strip-ansi": "4.0.0"
           },
           "dependencies": {
             "ansi-regex": {
@@ -200,7 +407,7 @@
               "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
               "dev": true,
               "requires": {
-                "ansi-regex": "^3.0.0"
+                "ansi-regex": "3.0.0"
               }
             }
           }
@@ -219,9 +426,9 @@
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-        "@oclif/linewrap": "^1.0.0",
-        "chalk": "^2.4.1",
-        "tslib": "^1.9.3"
+        "@oclif/linewrap": "1.0.0",
+        "chalk": "2.4.1",
+        "tslib": "1.9.3"
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@@ -230,7 +437,7 @@
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           "dev": true,
           "requires": {
-            "color-convert": "^1.9.0"
+            "color-convert": "1.9.0"
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         "chalk": {
@@ -239,9 +446,9 @@
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-            "ansi-styles": "^3.2.1",
-            "escape-string-regexp": "^1.0.5",
-            "supports-color": "^5.3.0"
+            "ansi-styles": "3.2.1",
+            "escape-string-regexp": "1.0.5",
+            "supports-color": "5.5.0"
           }
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@@ -256,7 +463,7 @@
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           "dev": true,
           "requires": {
-            "has-flag": "^3.0.0"
+            "has-flag": "3.0.0"
           }
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       }
@@ -267,14 +474,14 @@
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       "dev": true,
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-        "@oclif/command": "^1.5.4",
-        "chalk": "^2.4.1",
-        "indent-string": "^3.2.0",
-        "lodash.template": "^4.4.0",
-        "string-width": "^2.1.1",
-        "strip-ansi": "^5.0.0",
-        "widest-line": "^2.0.1",
-        "wrap-ansi": "^4.0.0"
+        "@oclif/command": "1.5.6",
+        "chalk": "2.4.1",
+        "indent-string": "3.2.0",
+        "lodash.template": "4.4.0",
+        "string-width": "2.1.1",
+        "strip-ansi": "5.0.0",
+        "widest-line": "2.0.1",
+        "wrap-ansi": "4.0.0"
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       "dependencies": {
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-          "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
-          }
-        }
-      }
-    },
     "widest-line": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
       "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==",
       "dev": true,
       "requires": {
-        "string-width": "^2.1.1"
+        "string-width": "2.1.1"
       }
     },
     "window-size": {
@@ -16631,7 +15485,7 @@
       "integrity": "sha512-hBb7m7acFgQPQc222uEQTmdcGLeBmQLNLFIh0rDk3CwFOBrfjefLzEfEfmpMq8Af/n/GnFf3eYf203FY1PmudA==",
       "dev": true,
       "requires": {
-        "execa": "^0.10.0"
+        "execa": "0.10.0"
       },
       "dependencies": {
         "cross-spawn": {
@@ -16640,11 +15494,11 @@
           "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
           "dev": true,
           "requires": {
-            "nice-try": "^1.0.4",
-            "path-key": "^2.0.1",
-            "semver": "^5.5.0",
-            "shebang-command": "^1.2.0",
-            "which": "^1.2.9"
+            "nice-try": "1.0.4",
+            "path-key": "2.0.1",
+            "semver": "5.6.0",
+            "shebang-command": "1.2.0",
+            "which": "1.3.0"
           }
         },
         "execa": {
@@ -16653,13 +15507,13 @@
           "integrity": "sha512-7XOMnz8Ynx1gGo/3hyV9loYNPWM94jG3+3T3Y8tsfSstFmETmENCMU/A/zj8Lyaj1lkgEepKepvd6240tBRvlw==",
           "dev": true,
           "requires": {
-            "cross-spawn": "^6.0.0",
-            "get-stream": "^3.0.0",
-            "is-stream": "^1.1.0",
-            "npm-run-path": "^2.0.0",
-            "p-finally": "^1.0.0",
-            "signal-exit": "^3.0.0",
-            "strip-eof": "^1.0.0"
+            "cross-spawn": "6.0.5",
+            "get-stream": "3.0.0",
+            "is-stream": "1.1.0",
+            "npm-run-path": "2.0.2",
+            "p-finally": "1.0.0",
+            "signal-exit": "3.0.2",
+            "strip-eof": "1.0.0"
           }
         },
         "semver": {
@@ -16682,17 +15536,17 @@
       "integrity": "sha512-6w+3tHbM87WnSWnENBUvA2pxJPLhQUg5LKwUQHq3r+XPhIM+Gh2R5ycbwPCyuGbNg+lPgdcnQUhuC02kJCvffQ==",
       "dev": true,
       "requires": {
-        "errno": "~0.1.7"
+        "errno": "0.1.7"
       }
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1"
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1"
       },
       "dependencies": {
         "string-width": {
@@ -16701,9 +15555,9 @@
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "code-point-at": "1.1.0",
+            "is-fullwidth-code-point": "1.0.0",
+            "strip-ansi": "3.0.1"
           }
         }
       }
@@ -16720,7 +15574,7 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "^0.5.1"
+        "mkdirp": "0.5.1"
       }
     },
     "write-file-atomic": {
@@ -16729,9 +15583,9 @@
       "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
       "dev": true,
       "requires": {
-        "graceful-fs": "^4.1.11",
-        "imurmurhash": "^0.1.4",
-        "signal-exit": "^3.0.2"
+        "graceful-fs": "4.1.11",
+        "imurmurhash": "0.1.4",
+        "signal-exit": "3.0.2"
       }
     },
     "ws": {
@@ -16740,9 +15594,9 @@
       "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
       "dev": true,
       "requires": {
-        "async-limiter": "~1.0.0",
-        "safe-buffer": "~5.1.0",
-        "ultron": "~1.1.0"
+        "async-limiter": "1.0.0",
+        "safe-buffer": "5.1.1",
+        "ultron": "1.1.1"
       }
     },
     "xdg-basedir": {
@@ -16764,8 +15618,8 @@
       "integrity": "sha1-aGwg8hMgnpSr8NG88e+qKRx4J6c=",
       "dev": true,
       "requires": {
-        "sax": ">=0.6.0",
-        "xmlbuilder": "~9.0.1"
+        "sax": "1.2.4",
+        "xmlbuilder": "9.0.4"
       }
     },
     "xmlbuilder": {
@@ -16780,13 +15634,6 @@
       "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4=",
       "dev": true
     },
-    "xregexp": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-2.0.0.tgz",
-      "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM=",
-      "dev": true,
-      "optional": true
-    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
@@ -16812,9 +15659,9 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "camelcase": "^1.0.2",
-        "cliui": "^2.1.0",
-        "decamelize": "^1.0.0",
+        "camelcase": "1.2.1",
+        "cliui": "2.1.0",
+        "decamelize": "1.2.0",
         "window-size": "0.1.0"
       }
     },
@@ -16824,7 +15671,7 @@
       "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
       "dev": true,
       "requires": {
-        "camelcase": "^4.1.0"
+        "camelcase": "4.1.0"
       },
       "dependencies": {
         "camelcase": {
@@ -16847,7 +15694,7 @@
       "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
       "dev": true,
       "requires": {
-        "fd-slicer": "~1.0.1"
+        "fd-slicer": "1.0.1"
       }
     },
     "yeast": {
@@ -16868,9 +15715,9 @@
       "integrity": "sha512-c+eUhhkDpaK87G/py74wvWLtz2kzMPNCCkUApkun50ssE0oQliIQzWpTnwjB+MTKVIf2tGzIgHyqW/Y+W77ecQ==",
       "dev": true,
       "requires": {
-        "archiver-utils": "^2.0.0",
-        "compress-commons": "^1.2.0",
-        "readable-stream": "^2.0.0"
+        "archiver-utils": "2.0.0",
+        "compress-commons": "1.2.2",
+        "readable-stream": "2.3.3"
       }
     }
   }
diff --git a/package.json b/package.json
index 2b0a4de6202..5ccf2f612a0 100644
--- a/package.json
+++ b/package.json
@@ -12,14 +12,6 @@
     "url": "https://github.com/video-dev/hls.js/issues"
   },
   "main": "./dist/hls.js",
-  "nyc": {
-    "reporter": [
-      "lcov"
-    ],
-    "exclude": [
-      "tests"
-    ]
-  },
   "publishConfig": {
     "access": "public"
   },
@@ -39,22 +31,22 @@
     "test": "npm run test:unit && npm run test:func",
     "test:unit": "karma start karma.conf.js",
     "test:unit:watch": "karma start karma.conf.js --auto-watch --no-single-run",
-    "test:func": "mocha --require ts-node/register tests/functional/auto/setup.js --timeout 40000"
+    "test:func": "mocha --require ts-node/register tests/functional/auto/setup.js --timeout 40000 --exit"
   },
   "dependencies": {
     "eventemitter3": "3.1.0",
     "url-toolkit": "^2.1.6"
   },
   "devDependencies": {
-    "arraybuffer-equal": "^1.0.4",
+    "chai": "4.2.0",
     "chromedriver": "^2.38.3",
-    "deep-strict-equal": "^0.2.0",
     "esdoc": "^1.1.0",
     "esdoc-standard-plugin": "^1.0.0",
     "esdoc-typescript-plugin": "^1.0.1",
     "eslint": "^4.13.1",
     "eslint-config-standard": "^11.0.0",
     "eslint-plugin-import": "^2.9.0",
+    "eslint-plugin-mocha": "^5.2.1",
     "eslint-plugin-node": "^6.0.1",
     "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-standard": "^3.0.1",
@@ -64,20 +56,20 @@
     "http-server": "^0.11.0",
     "husky": "^0.14.3",
     "istanbul-instrumenter-loader": "^3.0.1",
-    "karma": "^2.0.0",
+    "karma": "3.1.3",
     "karma-chrome-launcher": "^2.2.0",
-    "karma-coverage-istanbul-reporter": "^1.3.0",
-    "karma-mocha": "^1.3.0",
-    "karma-mocha-reporter": "^2.2.3",
-    "karma-should": "^1.0.0",
-    "karma-sinon": "^1.0.5",
+    "karma-coverage-istanbul-reporter": "2.0.4",
+    "karma-mocha": "1.3.0",
+    "karma-mocha-reporter": "2.2.5",
+    "karma-sinon": "1.0.5",
+    "karma-sinon-chai": "2.0.2",
     "karma-sourcemap-loader": "^0.3.7",
-    "karma-webpack": "^3.0.0",
-    "mocha": "^3.0.2",
+    "karma-webpack": "3.0.5",
+    "mocha": "5.2.0",
     "netlify-cli": "^2.5.1",
     "selenium-webdriver": "^3.1.0",
-    "should": "^13.1.3",
-    "sinon": "^4.1.3",
+    "sinon": "7.1.1",
+    "sinon-chai": "3.3.0",
     "ts-loader": "^4.4.2",
     "ts-node": "^6.1.0",
     "typescript": "^2.9.1",
diff --git a/tests/.eslintrc.js b/tests/.eslintrc.js
index f1338918b8f..22c98596268 100644
--- a/tests/.eslintrc.js
+++ b/tests/.eslintrc.js
@@ -3,18 +3,24 @@ module.exports = {
         "node": true,
         "commonjs": true,
         "es6": true,
+        "mocha": true
     },
-    "globals": {
-        // Test globals
-        "after": false,
-        "afterEach": false,
-        "assert": false,
-        "before": false,
-        "beforeEach": false,
-        "describe": false,
-        "expect": false,
-        "it": false,
-        "sinon": false,
-        "xit": false
+  "plugins": [ "mocha" ],
+  "globals": {
+      // Test globals
+      "after": false,
+      "afterEach": false,
+      "assert": false,
+      "before": false,
+      "beforeEach": false,
+      "describe": false,
+      "expect": true,
+      "sinon": false,
+      "xit": false
     },
+    "rules": {
+        "no-unused-expressions": 0,
+        "no-restricted-modules": ["error", "assert"],
+        "mocha/no-mocha-arrows": 2
+    }
 };
diff --git a/tests/functional/auto/setup.js b/tests/functional/auto/setup.js
index 06433acd814..511620edbbe 100644
--- a/tests/functional/auto/setup.js
+++ b/tests/functional/auto/setup.js
@@ -1,15 +1,14 @@
-const assert = require('assert');
 const webdriver = require('selenium-webdriver');
 // requiring this automatically adds the chromedriver binary to the PATH
 const chromedriver = require('chromedriver');
 const HttpServer = require('http-server');
 const streams = require('../../test-streams');
-
 const browserConfig = { version: 'latest' };
 const onTravis = !!process.env.TRAVIS;
+const chai = require('chai');
+const expect = chai.expect;
 
 let browserDescription;
-
 let stream;
 
 // Setup browser config data from env vars
@@ -164,7 +163,7 @@ describe('testing hls.js playback in the browser on "' + browserDescription + '"
           callback({ code: 'loadeddata', logs: window.logString });
         };
       }, url, config).then(function (result) {
-        assert.strictEqual(result.code, 'loadeddata');
+        expect(result.code).to.equal('loadeddata');
       });
     };
   };
@@ -190,7 +189,7 @@ describe('testing hls.js playback in the browser on "' + browserDescription + '"
           }
         });
       }, url, config).then(function (result) {
-        assert.strictEqual(result.code, true);
+        expect(result.code).to.be.true;
       });
     };
   };
@@ -210,7 +209,7 @@ describe('testing hls.js playback in the browser on "' + browserDescription + '"
           callback({ code: 'seeked', logs: window.logString });
         };
       }, url, config).then(function (result) {
-        assert.strictEqual(result.code, 'seeked');
+        expect(result.code).to.equal('seeked');
       });
     };
   };
@@ -230,7 +229,7 @@ describe('testing hls.js playback in the browser on "' + browserDescription + '"
           callback({ code: 'ended', logs: window.logString });
         };
       }, url, config).then(function (result) {
-        assert.strictEqual(result.code, 'ended');
+        expect(result.code).to.equal('ended');
       });
     };
   };
@@ -250,7 +249,7 @@ describe('testing hls.js playback in the browser on "' + browserDescription + '"
           callback({ code: 'ended', logs: window.logString });
         };
       }, url, config).then(function (result) {
-        assert.strictEqual(result.code, 'ended');
+        expect(result.code).to.equal('ended');
       });
     };
   };
@@ -277,7 +276,7 @@ describe('testing hls.js playback in the browser on "' + browserDescription + '"
           }
         };
       }, url, config).then(function (result) {
-        assert.strictEqual(result.playing, true);
+        expect(result.playing).to.be.true;
       });
     };
   };
diff --git a/tests/index.js b/tests/index.js
new file mode 100644
index 00000000000..87ff1017997
--- /dev/null
+++ b/tests/index.js
@@ -0,0 +1,4 @@
+const testsContext = require.context('./unit', true);
+testsContext.keys().forEach(testsContext);
+
+export default testsContext;
diff --git a/tests/unit/controller/abr-controller.js b/tests/unit/controller/abr-controller.js
index 96b7e8e1c59..98196099bc4 100644
--- a/tests/unit/controller/abr-controller.js
+++ b/tests/unit/controller/abr-controller.js
@@ -2,12 +2,10 @@ import AbrController from '../../../src/controller/abr-controller';
 import EwmaBandWidthEstimator from '../../../src/utils/ewma-bandwidth-estimator';
 import Hls from '../../../src/hls';
 
-const assert = require('assert');
-
 describe('AbrController', function () {
   it('should return null if _bwEstimator is not specified', function () {
     let hls = new Hls();
-    assert.strictEqual(hls.abrController._bwEstimator, null);
+    expect(hls.abrController._bwEstimator).to.be.null;
   });
 
   it('should return correct next auto level', function () {
@@ -22,6 +20,6 @@ describe('AbrController', function () {
     ];
     let abrController = new AbrController(hls);
     abrController.bwEstimator = new EwmaBandWidthEstimator(hls, 15, 4, 5e5);
-    assert.equal(abrController.nextAutoLevel, 0);
+    expect(abrController.nextAutoLevel).to.equal(0);
   });
 });
diff --git a/tests/unit/controller/audio-track-controller.js b/tests/unit/controller/audio-track-controller.js
index f254bb9db2d..6ecae5db444 100644
--- a/tests/unit/controller/audio-track-controller.js
+++ b/tests/unit/controller/audio-track-controller.js
@@ -1,10 +1,9 @@
 import AudioTrackController from '../../../src/controller/audio-track-controller';
 import Hls from '../../../src/hls';
 
-const assert = require('assert');
 const sinon = require('sinon');
 
-describe('AudioTrackController', () => {
+describe('AudioTrackController', function () {
   const tracks = [{
     groupId: '1',
     id: 0,
@@ -38,29 +37,28 @@ describe('AudioTrackController', () => {
   let hls;
   let audioTrackController;
 
-  beforeEach(() => {
+  beforeEach(function () {
     hls = new Hls();
     audioTrackController = new AudioTrackController(hls);
   });
 
-  afterEach(() => {
+  afterEach(function () {
     hls.destroy();
   });
 
-  describe('onManifestLoading', () => {
-    it('should reset the tracks list and current trackId', () => {
+  describe('onManifestLoading', function () {
+    it('should reset the tracks list and current trackId', function () {
       audioTrackController.tracks = tracks;
       audioTrackController.onManifestLoading();
-      assert.strictEqual(audioTrackController.tracks.length, 0);
+      expect(audioTrackController.tracks).to.be.empty;
     });
   });
 
-  describe('onManifestParsed', () => {
-    it('should set the audioTracks contained in the event data and trigger AUDIO_TRACKS_UPDATED', (done) => {
+  describe('onManifestParsed', function () {
+    it('should set the audioTracks contained in the event data and trigger AUDIO_TRACKS_UPDATED', function (done) {
       hls.on(Hls.Events.AUDIO_TRACKS_UPDATED, (event, data) => {
-        assert.strictEqual(data.audioTracks, tracks);
-        assert.strictEqual(audioTrackController.tracks, tracks);
-
+        expect(data.audioTracks).to.equal(tracks);
+        expect(audioTrackController.tracks).to.equal(tracks);
         done();
       });
 
@@ -69,10 +67,10 @@ describe('AudioTrackController', () => {
       });
     });
 
-    it('should set the audioTracks contained in the event data (nullable) to an empty array and trigger AUDIO_TRACKS_UPDATED', (done) => {
+    it('should set the audioTracks contained in the event data (nullable) to an empty array and trigger AUDIO_TRACKS_UPDATED', function (done) {
       hls.on(Hls.Events.AUDIO_TRACKS_UPDATED, (event, data) => {
-        assert.strictEqual(data.audioTracks.length, 0);
-        assert.strictEqual(audioTrackController.tracks.length, 0);
+        expect(data.audioTracks).to.be.empty;
+        expect(audioTrackController.tracks).to.be.empty;
         done();
       });
 
@@ -82,20 +80,20 @@ describe('AudioTrackController', () => {
     });
   });
 
-  describe('_needsTrackLoading', () => {
-    it('should not need loading because the audioTrack is embedded in the main playlist', () => {
-      assert.strictEqual(audioTrackController._needsTrackLoading({ details: { live: true } }), false);
-      assert.strictEqual(audioTrackController._needsTrackLoading({ details: null }), false);
+  describe('_needsTrackLoading', function () {
+    it('should not need loading because the audioTrack is embedded in the main playlist', function () {
+      expect(audioTrackController._needsTrackLoading({ details: { live: true } })).to.be.false;
+      expect(audioTrackController._needsTrackLoading({ details: null })).to.be.false;
     });
 
-    it('should need loading because the track has not been loaded yet', () => {
-      assert.strictEqual(audioTrackController._needsTrackLoading({ details: { live: true }, url: 'http://example.com/manifest.m3u8' }), true);
-      assert.strictEqual(audioTrackController._needsTrackLoading({ details: null, url: 'http://example.com/manifest.m3u8' }), true);
+    it('should need loading because the track has not been loaded yet', function () {
+      expect(audioTrackController._needsTrackLoading({ details: { live: true }, url: 'http://example.com/manifest.m3u8' })).to.be.true;
+      expect(audioTrackController._needsTrackLoading({ details: null, url: 'http://example.com/manifest.m3u8' })).to.be.true;
     });
   });
 
-  describe('onAudioTrackLoaded', () => {
-    it('should set the track details from the event data but not set the interval for a non-live track', () => {
+  describe('onAudioTrackLoaded', function () {
+    it('should set the track details from the event data but not set the interval for a non-live track', function () {
       const details = {
         live: false,
         targetduration: 100
@@ -108,11 +106,11 @@ describe('AudioTrackController', () => {
         details
       });
 
-      assert.strictEqual(audioTrackController.tracks[0].details, details);
-      assert.strictEqual(audioTrackController.hasInterval(), false);
+      expect(audioTrackController.tracks[0].details).to.equal(details);
+      expect(audioTrackController.hasInterval()).to.be.false;
     });
 
-    it('should set the track details from the event data and set the interval for a live track', () => {
+    it('should set the track details from the event data and set the interval for a live track', function () {
       const details = {
         live: true,
         targetduration: 100
@@ -125,32 +123,25 @@ describe('AudioTrackController', () => {
         details
       });
 
-      assert.strictEqual(audioTrackController.tracks[0].details, details);
-      assert.strictEqual(audioTrackController.hasInterval(), true);
+      expect(audioTrackController.tracks[0].details).to.equal(details);
+      expect(audioTrackController.hasInterval()).to.be.true;
     });
   });
 
-  describe('onAudioTrackSwitched', () => {
-    it('should update the current audioGroupId', () => {
-      const details = {
-        live: true,
-        targetduration: 100
-      };
-
+  describe('onAudioTrackSwitched', function () {
+    it('should update the current audioGroupId', function () {
       audioTrackController.tracks = tracks;
-
       audioTrackController.audioGroupId = '2';
-
       audioTrackController.onAudioTrackSwitched({
         id: 1
       });
 
-      assert.strictEqual(audioTrackController.audioGroupId, '1');
+      expect(audioTrackController.audioGroupId).to.equal('1');
     });
   });
 
-  describe('onLevelLoaded', () => {
-    it('should reselect the current track and trigger AUDIO_TRACK_SWITCHING eventually', (done) => {
+  describe('onLevelLoaded', function () {
+    it('should reselect the current track and trigger AUDIO_TRACK_SWITCHING eventually', function (done) {
       hls.on(Hls.Events.AUDIO_TRACK_SWITCHING, (event, data) => {
         done();
       });
@@ -183,13 +174,70 @@ describe('AudioTrackController', () => {
       audioTrackController.onLevelLoaded(levelLoadedEvent);
 
       // group has switched
-      assert.strictEqual(audioTrackController.audioGroupId, newGroupId);
-
+      expect(audioTrackController.audioGroupId).to.equal(newGroupId);
       // name is still the same
-      assert.strictEqual(tracks[audioTrackController.audioTrack].name, audioTrackName);
+      expect(tracks[audioTrackController.audioTrack].name).to.equal(audioTrackName);
+    });
+
+    it('should load audio tracks with a url', function () {
+      const needsTrackLoading = sinon.spy(audioTrackController, '_needsTrackLoading');
+      const audioTrackLoadingCallback = sinon.spy();
+      const trackWithUrl = {
+        groupId: '1',
+        id: 0,
+        name: 'A',
+        default: true,
+        url: './trackA.m3u8'
+      };
+
+      hls.on(Hls.Events.AUDIO_TRACK_LOADING, audioTrackLoadingCallback);
+
+      hls.levelController = {
+        levels: [{
+          urlId: 0,
+          audioGroupIds: ['1']
+        }]
+      };
+
+      audioTrackController.tracks = [trackWithUrl];
+
+      audioTrackController.onLevelLoaded({
+        level: 0
+      });
+
+      expect(needsTrackLoading).to.have.been.calledOnce;
+      expect(needsTrackLoading).to.have.been.calledWith(trackWithUrl);
+      expect(needsTrackLoading.firstCall.returnValue).to.be.true;
+      expect(audioTrackLoadingCallback).to.have.been.calledOnce;
     });
 
-    it('should load audio tracks with a url', () => {
+    it('should not attempt to load audio tracks without a url', function () {
+      const needsTrackLoading = sinon.spy(audioTrackController, '_needsTrackLoading');
+      const audioTrackLoadingCallback = sinon.spy();
+      const trackWithOutUrl = tracks[0];
+
+      hls.on(Hls.Events.AUDIO_TRACK_LOADING, audioTrackLoadingCallback);
+
+      hls.levelController = {
+        levels: [{
+          urlId: 0,
+          audioGroupIds: ['1']
+        }]
+      };
+
+      audioTrackController.tracks = tracks;
+
+      audioTrackController.onLevelLoaded({
+        level: 0
+      });
+
+      expect(needsTrackLoading).to.have.been.calledOnce;
+      expect(needsTrackLoading).to.have.been.calledWith(trackWithOutUrl);
+      expect(needsTrackLoading.firstCall.returnValue).to.be.false;
+      expect(audioTrackLoadingCallback).to.not.have.been.called;
+    });
+
+    it('should load audio tracks with a url', function () {
       const needsTrackLoading = sinon.spy(audioTrackController, '_needsTrackLoading');
       const audioTrackLoadingCallback = sinon.spy();
       const trackWithUrl = {
@@ -215,14 +263,14 @@ describe('AudioTrackController', () => {
         level: 0
       });
 
-      sinon.assert.calledOnce(needsTrackLoading);
-      sinon.assert.calledWith(needsTrackLoading, trackWithUrl);
-      assert.strictEqual(needsTrackLoading.firstCall.returnValue, true, 'expected _needsTrackLoading to return true');
+      expect(needsTrackLoading).to.have.been.calledOnce;
+      expect(needsTrackLoading).to.have.been.calledWith(trackWithUrl);
+      expect(needsTrackLoading.firstCall.returnValue, true, 'expected _needsTrackLoading to return true');
 
-      sinon.assert.calledOnce(audioTrackLoadingCallback);
+      expect(audioTrackLoadingCallback).to.have.been.calledOnce;
     });
 
-    it('should not attempt to load audio tracks without a url', () => {
+    it('should not attempt to load audio tracks without a url', function () {
       const needsTrackLoading = sinon.spy(audioTrackController, '_needsTrackLoading');
       const audioTrackLoadingCallback = sinon.spy();
       const trackWithOutUrl = tracks[0];
@@ -242,68 +290,60 @@ describe('AudioTrackController', () => {
         level: 0
       });
 
-      sinon.assert.calledOnce(needsTrackLoading);
-      sinon.assert.calledWith(needsTrackLoading, trackWithOutUrl);
-      assert.strictEqual(needsTrackLoading.firstCall.returnValue, false, 'expected _needsTrackLoading to return false');
+      expect(needsTrackLoading).to.have.been.calledOnce;
+      expect(needsTrackLoading).to.have.been.calledWith(trackWithOutUrl);
+      expect(needsTrackLoading.firstCall.returnValue).to.be.false;
 
-      sinon.assert.notCalled(audioTrackLoadingCallback);
+      expect(audioTrackLoadingCallback).to.not.have.been.called;
     });
   });
 
-  describe('onError', () => {
-    it('should clear interval (only) on fatal network errors', () => {
+  describe('onError', function () {
+    it('should clear interval (only) on fatal network errors', function () {
       audioTrackController.setInterval(1000);
 
       audioTrackController.onError({
         type: Hls.ErrorTypes.MEDIA_ERROR
       });
 
-      assert.strictEqual(audioTrackController.hasInterval(), true);
-
+      expect(audioTrackController.hasInterval()).to.be.true;
       audioTrackController.onError({
         type: Hls.ErrorTypes.MEDIA_ERROR,
         fatal: true
       });
 
-      assert.strictEqual(audioTrackController.hasInterval(), true);
-
+      expect(audioTrackController.hasInterval()).to.be.true;
       audioTrackController.onError({
         type: Hls.ErrorTypes.NETWORK_ERROR,
         fatal: false
       });
 
-      assert.strictEqual(audioTrackController.hasInterval(), true);
-
+      expect(audioTrackController.hasInterval()).to.be.true;
       audioTrackController.onError({
         type: Hls.ErrorTypes.NETWORK_ERROR,
         fatal: true
       });
 
       // fatal network error clears interval
-      assert.strictEqual(audioTrackController.hasInterval(), false);
+      expect(audioTrackController.hasInterval()).to.be.false;
     });
 
-    it('should blacklist current track on fatal network error, and find a backup track (fallback mechanism)', () => {
+    it('should blacklist current track on fatal network error, and find a backup track (fallback mechanism)', function () {
       const currentTrackId = 4;
-
       audioTrackController._trackId = currentTrackId;
-
       audioTrackController.tracks = tracks;
-
       audioTrackController.onError({
         type: Hls.ErrorTypes.MEDIA_ERROR,
         fatal: true
       });
 
-      assert.strictEqual(!!audioTrackController.trackIdBlacklist[currentTrackId], false);
-
+      expect(!!audioTrackController.trackIdBlacklist[currentTrackId]).to.be.false;
       audioTrackController.onError({
         type: Hls.ErrorTypes.NETWORK_ERROR,
         fatal: true
       });
 
-      assert.strictEqual(!!audioTrackController.trackIdBlacklist[currentTrackId], false);
-
+      expect(!!audioTrackController.trackIdBlacklist[currentTrackId]).to.be.false;
       audioTrackController.onError({
         type: Hls.ErrorTypes.NETWORK_ERROR,
         details: Hls.ErrorDetails.AUDIO_TRACK_LOAD_ERROR,
@@ -313,9 +353,8 @@ describe('AudioTrackController', () => {
         }
       });
 
-      assert.strictEqual(!!audioTrackController.trackIdBlacklist[currentTrackId], true);
-
-      assert.strictEqual(audioTrackController.audioTrack, 1);
+      expect(!!audioTrackController.trackIdBlacklist[currentTrackId]).to.be.true;
+      expect(audioTrackController.audioTrack).to.equal(1);
     });
   });
 });
diff --git a/tests/unit/controller/base-stream-controller.js b/tests/unit/controller/base-stream-controller.js
index a161f868e2d..3ae5e8bfd25 100644
--- a/tests/unit/controller/base-stream-controller.js
+++ b/tests/unit/controller/base-stream-controller.js
@@ -1,7 +1,6 @@
 import BaseStreamController from '../../../src/controller/stream-controller';
 import Hls from '../../../src/hls';
 import { FragmentState } from '../../../src/controller/fragment-tracker';
-const assert = require('assert');
 
 describe('BaseStreamController', function () {
   let baseStreamController;
@@ -35,30 +34,30 @@ describe('BaseStreamController', function () {
   describe('_streamEnded', function () {
     it('returns false if the stream is live', function () {
       levelDetails.live = true;
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), false);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails)).to.be.false;
     });
 
     it('returns false if fragCurrent does not exist', function () {
       baseStreamController.fragCurrent = null;
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), false);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails)).to.be.false;
     });
 
     it('returns false if fragCurrent has backtracked set to true', function () {
       baseStreamController.fragCurrent = { backtracked: true };
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), false);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails)).to.be.false;
     });
 
     it('returns false if fragCurrent is not the last fragment', function () {
       baseStreamController.fragCurrent = { sn: 9 };
       levelDetails.endSN = 10;
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), false);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails)).to.be.false;
     });
 
     it('returns false if there is subsequently buffered range', function () {
       baseStreamController.fragCurrent = { sn: 10 };
       levelDetails.endSN = 10;
       bufferInfo.nextStart = 100;
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), false);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails)).to.be.false;
     });
 
     it('returns true if fragCurrent is PARTIAL or OK', function () {
@@ -66,10 +65,10 @@ describe('BaseStreamController', function () {
       levelDetails.endSN = 10;
 
       fragmentTracker.state = FragmentState.PARTIAL;
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), true, `fragState is ${fragmentTracker.getState()}, expecting PARTIAL`);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails), `fragState is ${fragmentTracker.getState()}, expecting PARTIAL`).to.be.true;
 
       fragmentTracker.state = FragmentState.OK;
-      assert.strictEqual(baseStreamController._streamEnded(bufferInfo, levelDetails), true, `fragState is ${fragmentTracker.getState()}, expecting OK`);
+      expect(baseStreamController._streamEnded(bufferInfo, levelDetails), `fragState is ${fragmentTracker.getState()}, expecting OK`).to.be.true;
     });
   });
 });
diff --git a/tests/unit/controller/buffer-controller.js b/tests/unit/controller/buffer-controller.js
index 92f52f53607..f5b55e5ca23 100644
--- a/tests/unit/controller/buffer-controller.js
+++ b/tests/unit/controller/buffer-controller.js
@@ -1,4 +1,3 @@
-import assert from 'assert';
 import sinon from 'sinon';
 import Hls from '../../../src/hls';
 import BufferController from '../../../src/controller/buffer-controller';
@@ -48,7 +47,7 @@ describe('BufferController tests', function () {
 
     it('exits early if not live', function () {
       bufferController.flushLiveBackBuffer();
-      assert(removeStub.notCalled);
+      expect(removeStub).to.not.have.been.called;
     });
 
     it('exits early if liveBackBufferLength is not a finite number, or is less than 0', function () {
@@ -58,7 +57,7 @@ describe('BufferController tests', function () {
       hls.config.liveBackBufferLength = -1;
       bufferController.flushLiveBackBuffer();
 
-      assert(removeStub.notCalled);
+      expect(removeStub).to.not.have.been.called;
     });
 
     it('does not flush if nothing is buffered', function () {
@@ -68,29 +67,29 @@ describe('BufferController tests', function () {
       mockSourceBuffer = null;
       bufferController.flushLiveBackBuffer();
 
-      assert(removeStub.notCalled);
+      expect(removeStub).to.not.have.been.called;
     });
 
     it('does not flush if no buffered range intersects with back buffer limit', function () {
       bufStart = 5;
       mockMedia.currentTime = 10;
       bufferController.flushLiveBackBuffer();
-      assert(removeStub.notCalled);
+      expect(removeStub).to.not.have.been.called;
     });
 
     it('does not flush if the liveBackBufferLength is Infinity', function () {
       hls.config.liveBackBufferLength = Infinity;
       mockMedia.currentTime = 15;
       bufferController.flushLiveBackBuffer();
-      assert(removeStub.notCalled);
+      expect(removeStub).to.not.have.been.called;
     });
 
     it('flushes up to the back buffer limit if the buffer intersects with that point', function () {
       mockMedia.currentTime = 15;
       bufferController.flushLiveBackBuffer();
-      assert(removeStub.calledOnce);
-      assert(!bufferController.flushBufferCounter, 'Should reset the flushBufferCounter');
-      assert(removeStub.calledWith('video', mockSourceBuffer.video, 0, 5));
+      expect(removeStub).to.have.been.calledOnce;
+      expect(bufferController.flushBufferCounter).to.equal(0);
+      expect(removeStub).to.have.been.calledWith('video', mockSourceBuffer.video, 0, 5);
     });
 
     it('flushes to a max of one targetDuration from currentTime, regardless of liveBackBufferLength', function () {
@@ -98,7 +97,7 @@ describe('BufferController tests', function () {
       bufferController._levelTargetDuration = 5;
       hls.config.liveBackBufferLength = 0;
       bufferController.flushLiveBackBuffer();
-      assert(removeStub.calledWith('video', mockSourceBuffer.video, 0, 10));
+      expect(removeStub).to.have.been.calledWith('video', mockSourceBuffer.video, 0, 10);
     });
 
     it('should trigger clean back buffer when there are no pending appends', function () {
@@ -109,12 +108,12 @@ describe('BufferController tests', function () {
 
       bufferController._onSBUpdateEnd();
 
-      assert(flushSpy.notCalled, 'clear live back buffer was called');
+      expect(flushSpy).to.not.have.been.called;
 
       bufferController.segments = [];
       bufferController._onSBUpdateEnd();
 
-      assert(flushSpy.calledOnce, 'clear live back buffer was not called once');
+      expect(flushSpy).to.have.been.calledOnce;
     });
   });
 
@@ -128,14 +127,14 @@ describe('BufferController tests', function () {
     });
 
     it('initializes with zero expected BUFFER_CODEC events', function () {
-      assert.strictEqual(bufferController.bufferCodecEventsExpected, 0);
+      expect(bufferController.bufferCodecEventsExpected).to.equal(0);
     });
 
     it('should throw if no media element has been attached', function () {
       bufferController.createSourceBuffers.restore();
       bufferController.pendingTracks = { video: {} };
 
-      assert.throws(bufferController.checkPendingTracks);
+      expect(bufferController.checkPendingTracks).to.throw();
     });
 
     it('exposes tracks from buffer controller through BUFFER_CREATED event', function (done) {
@@ -146,8 +145,8 @@ describe('BufferController tests', function () {
 
       hls.on(Hls.Events.BUFFER_CREATED, (_, data) => {
         const tracks = data.tracks;
-        assert.notStrictEqual(bufferController.pendingTracks, tracks);
-        assert.strictEqual(bufferController.tracks, tracks);
+        expect(bufferController.pendingTracks).to.not.equal(tracks);
+        expect(bufferController.tracks).to.equal(tracks);
         done();
       });
 
@@ -159,19 +158,27 @@ describe('BufferController tests', function () {
 
     it('expects one bufferCodec event by default', function () {
       bufferController.onManifestParsed({});
-      assert.strictEqual(bufferController.bufferCodecEventsExpected, 1);
+      expect(bufferController.bufferCodecEventsExpected).to.equal(1);
     });
 
     it('expects two bufferCodec events if altAudio is signaled', function () {
       bufferController.onManifestParsed({ altAudio: true });
-      assert.strictEqual(bufferController.bufferCodecEventsExpected, 2);
+      expect(bufferController.bufferCodecEventsExpected).to.equal(2);
     });
 
     it('creates sourceBuffers when no more BUFFER_CODEC events are expected', function () {
       bufferController.pendingTracks = { video: {} };
 
       bufferController.checkPendingTracks();
-      assert.strictEqual(createSbStub.calledOnce, true);
+      expect(createSbStub).to.have.been.calledOnce;
+    });
+
+    it('creates sourceBuffers on the first even if two tracks are received', function () {
+      bufferController.pendingTracks = { audio: {}, video: {} };
+      bufferController.bufferCodecEventsExpected = 2;
+
+      bufferController.checkPendingTracks();
+      expect(createSbStub).to.have.been.calledOnce;
     });
 
     it('does not create sourceBuffers when BUFFER_CODEC events are expected', function () {
@@ -179,27 +186,27 @@ describe('BufferController tests', function () {
       bufferController.bufferCodecEventsExpected = 1;
 
       bufferController.checkPendingTracks();
-      assert.strictEqual(createSbStub.notCalled, true);
-      assert.strictEqual(bufferController.bufferCodecEventsExpected, 1);
+      expect(createSbStub).to.not.have.been.called;
+      expect(bufferController.bufferCodecEventsExpected).to.equal(1);
     });
 
     it('checks pending tracks in onMediaSourceOpen', function () {
       bufferController._onMediaSourceOpen();
-      assert.strictEqual(checkPendingTracksSpy.calledOnce, true);
+      expect(checkPendingTracksSpy).to.have.been.calledOnce;
     });
 
-    it('does not check pending tracks in onBufferCodecs until called for the expected amount of times', function () {
+    it('checks pending tracks even when more events are expected', function () {
       bufferController.sourceBuffer = {};
       bufferController.mediaSource = { readyState: 'open' };
       bufferController.bufferCodecEventsExpected = 2;
 
       bufferController.onBufferCodecs({});
-      assert.strictEqual(checkPendingTracksSpy.calledOnce, true);
-      assert.strictEqual(bufferController.bufferCodecEventsExpected, 1);
+      expect(checkPendingTracksSpy).to.have.been.calledOnce;
+      expect(bufferController.bufferCodecEventsExpected).to.equal(1);
 
       bufferController.onBufferCodecs({});
-      assert.strictEqual(checkPendingTracksSpy.calledTwice, true);
-      assert.strictEqual(bufferController.bufferCodecEventsExpected, 0);
+      expect(checkPendingTracksSpy).to.have.been.calledTwice;
+      expect(bufferController.bufferCodecEventsExpected).to.equal(0);
     });
 
     it('creates the expected amount of sourceBuffers given the standard event flow', function () {
@@ -211,8 +218,8 @@ describe('BufferController tests', function () {
       bufferController.onBufferCodecs({ audio: {} });
       bufferController.onBufferCodecs({ video: {} });
 
-      assert.strictEqual(createSbStub.calledOnce, true);
-      assert.strictEqual(createSbStub.calledWith({ audio: {}, video: {} }), true);
+      expect(createSbStub).to.have.been.calledOnce;
+      expect(createSbStub).to.have.been.calledWith({ audio: {}, video: {} });
     });
   });
 });
diff --git a/tests/unit/controller/cap-level-controller.js b/tests/unit/controller/cap-level-controller.js
index c013241b3ae..1fcfd330b82 100644
--- a/tests/unit/controller/cap-level-controller.js
+++ b/tests/unit/controller/cap-level-controller.js
@@ -2,8 +2,6 @@ import sinon from 'sinon';
 import Hls from '../../../src/hls';
 import CapLevelController from '../../../src/controller/cap-level-controller';
 
-const assert = require('assert');
-
 const levels = [
   {
     width: 360,
@@ -32,31 +30,31 @@ describe('CapLevelController', function () {
     it('Should choose the level whose dimensions are >= the media dimensions', function () {
       const expected = 0;
       const actual = CapLevelController.getMaxLevelByMediaSize(levels, 300, 300);
-      assert.equal(expected, actual);
+      expect(expected).to.equal(actual);
     });
 
     it('Should choose the level whose bandwidth is greater if level dimensions are equal', function () {
       const expected = 2;
       const actual = CapLevelController.getMaxLevelByMediaSize(levels, 500, 500);
-      assert.equal(expected, actual);
+      expect(expected).to.equal(actual);
     });
 
     it('Should choose the highest level if the media is greater than every level', function () {
       const expected = 3;
       const actual = CapLevelController.getMaxLevelByMediaSize(levels, 5000, 5000);
-      assert.equal(expected, actual);
+      expect(expected).to.equal(actual);
     });
 
     it('Should return -1 if there levels is empty', function () {
       const expected = -1;
       const actual = CapLevelController.getMaxLevelByMediaSize([], 5000, 5000);
-      assert.equal(expected, actual);
+      expect(expected).to.equal(actual);
     });
 
     it('Should return -1 if there levels is undefined', function () {
       const expected = -1;
       const actual = CapLevelController.getMaxLevelByMediaSize(undefined, 5000, 5000);
-      assert.equal(expected, actual);
+      expect(expected).to.equal(actual);
     });
   });
 
@@ -75,9 +73,10 @@ describe('CapLevelController', function () {
       it('immediately caps and sets a timer for monitoring size size', function () {
         const detectPlayerSizeSpy = sinon.spy(capLevelController, 'detectPlayerSize');
         capLevelController._startCapping();
-        assert(capLevelController.timer);
-        assert(firstLevelSpy.set.calledOnce);
-        assert(detectPlayerSizeSpy.calledOnce);
+
+        expect(capLevelController.timer).to.exist;
+        expect(firstLevelSpy.set.calledOnce).to.be.true;
+        expect(detectPlayerSizeSpy.calledOnce).to.be.true;
       });
 
       it('stops the capping timer and resets capping', function () {
@@ -85,36 +84,38 @@ describe('CapLevelController', function () {
         capLevelController.timer = 1;
         capLevelController._stopCapping();
 
-        assert.strictEqual(capLevelController.autoLevelCapping, Number.POSITIVE_INFINITY);
-        assert.strictEqual(capLevelController.restrictedLevels.length, 0);
-        assert.strictEqual(capLevelController.firstLevel, null);
-        assert.strictEqual(capLevelController.timer, null);
+        expect(capLevelController.autoLevelCapping).to.equal(Number.POSITIVE_INFINITY);
+        expect(capLevelController.restrictedLevels).to.be.empty;
+        expect(capLevelController.firstLevel).to.not.exist;
+        expect(capLevelController.timer).to.not.exist;
       });
     });
 
     it('constructs with no restrictions', function () {
-      assert.strictEqual(capLevelController.levels.length, 0);
-      assert.strictEqual(capLevelController.restrictedLevels.length, 0);
-      assert.strictEqual(capLevelController.timer, null);
-      assert.strictEqual(capLevelController.autoLevelCapping, Number.POSITIVE_INFINITY);
-      assert(firstLevelSpy.set.notCalled);
+      expect(capLevelController.levels).to.be.empty;
+      expect(capLevelController.restrictedLevels).to.be.empty;
+      expect(capLevelController.timer).to.not.exist;
+      expect(capLevelController.autoLevelCapping).to.equal(Number.POSITIVE_INFINITY);
+
+      expect(firstLevelSpy.set.notCalled).to.be.true;
     });
 
     it('starts capping on BUFFER_CODECS only if video is found', function () {
       capLevelController.onBufferCodecs({ video: {} });
-      assert(startCappingSpy.calledOnce);
+      expect(startCappingSpy.calledOnce).to.be.true;
     });
 
     it('does not start capping on BUFFER_CODECS if video is not found', function () {
       capLevelController.onBufferCodecs({ audio: {} });
-      assert(startCappingSpy.notCalled);
+      expect(startCappingSpy.notCalled).to.be.true;
     });
 
     it('starts capping if the video codec was found after the audio codec', function () {
       capLevelController.onBufferCodecs({ audio: {} });
-      assert(startCappingSpy.notCalled);
+      expect(startCappingSpy.notCalled).to.be.true;
+
       capLevelController.onBufferCodecs({ video: {} });
-      assert(startCappingSpy.calledOnce);
+      expect(startCappingSpy.calledOnce).to.be.true;
     });
 
     it('receives level information from the MANIFEST_PARSED event', function () {
@@ -125,19 +126,19 @@ describe('CapLevelController', function () {
       };
 
       capLevelController.onManifestParsed(data);
-      assert.strictEqual(capLevelController.levels, data.levels);
-      assert.strictEqual(capLevelController.firstLevel, data.firstLevel);
-      assert.strictEqual(capLevelController.restrictedLevels.length, 0);
+      expect(capLevelController.levels).to.equal(data.levels);
+      expect(capLevelController.firstLevel).to.equal(data.firstLevel);
+      expect(capLevelController.restrictedLevels).to.be.empty;
     });
 
     it('should start capping in MANIFEST_PARSED if a video codec was signaled in the manifest', function () {
       capLevelController.onManifestParsed({ video: {} });
-      assert(startCappingSpy.calledOnce);
+      expect(startCappingSpy.calledOnce).to.be.true;
     });
 
     it('does not start capping on MANIFEST_PARSED if no video codec was signaled in the manifest', function () {
       capLevelController.onManifestParsed({ levels: [{}], altAudio: true });
-      assert(startCappingSpy.notCalled);
+      expect(startCappingSpy.notCalled).to.be.true;
     });
   });
 });
diff --git a/tests/unit/controller/check-buffer.js b/tests/unit/controller/check-buffer.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/unit/controller/eme-controller.js b/tests/unit/controller/eme-controller.js
index 320b42534b9..abbd3550b80 100644
--- a/tests/unit/controller/eme-controller.js
+++ b/tests/unit/controller/eme-controller.js
@@ -1,9 +1,7 @@
 import EMEController from '../../../src/controller/eme-controller';
 import HlsMock from '../../mocks/hls.mock';
 import EventEmitter from 'events';
-import { ErrorTypes, ErrorDetails } from '../../../src/errors';
-
-import assert from 'assert';
+import { ErrorDetails } from '../../../src/errors';
 
 const sinon = require('sinon');
 
@@ -32,14 +30,12 @@ const setupEach = function (config) {
   emeController = new EMEController(new HlsMock(config));
 };
 
-describe('EMEController', () => {
-  beforeEach(() => {
+describe('EMEController', function () {
+  beforeEach(function () {
     setupEach();
   });
 
-  it('should be constructable with an unconfigured Hls.js instance', () => {});
-
-  it('should not do anything when `emeEnabled` is false (default)', () => {
+  it('should not do anything when `emeEnabled` is false (default)', function () {
     let reqMediaKsAccessSpy = sinon.spy();
 
     setupEach({
@@ -49,12 +45,12 @@ describe('EMEController', () => {
     emeController.onMediaAttached({ media });
     emeController.onManifestParsed({ media });
 
-    media.setMediaKeys.callCount.should.be.equal(0);
-    reqMediaKsAccessSpy.callCount.should.be.equal(0);
+    expect(media.setMediaKeys.callCount).to.equal(0);
+    expect(reqMediaKsAccessSpy.callCount).to.equal(0);
   });
 
-  it('should request keys when `emeEnabled` is true (but not set them)', (done) => {
-    let reqMediaKsAccessSpy = sinon.spy(() => {
+  it('should request keys when `emeEnabled` is true (but not set them)', function (done) {
+    let reqMediaKsAccessSpy = sinon.spy(function () {
       return Promise.resolve({
         // Media-keys mock
       });
@@ -67,20 +63,20 @@ describe('EMEController', () => {
 
     emeController.onMediaAttached({ media });
 
-    media.setMediaKeys.callCount.should.be.equal(0);
-    reqMediaKsAccessSpy.callCount.should.be.equal(0);
+    expect(media.setMediaKeys.callCount).to.equal(0);
+    expect(reqMediaKsAccessSpy.callCount).to.equal(0);
 
     emeController.onManifestParsed({ levels: fakeLevels });
 
-    setTimeout(() => {
-      media.setMediaKeys.callCount.should.be.equal(0);
-      reqMediaKsAccessSpy.callCount.should.be.equal(1);
+    setTimeout(function () {
+      expect(media.setMediaKeys.callCount).to.equal(0);
+      expect(reqMediaKsAccessSpy.callCount).to.equal(1);
       done();
     }, 0);
   });
 
-  it('should trigger key system error when bad encrypted data is received', (done) => {
-    let reqMediaKsAccessSpy = sinon.spy(() => {
+  it('should trigger key system error when bad encrypted data is received', function (done) {
+    let reqMediaKsAccessSpy = sinon.spy(function () {
       return Promise.resolve({
         // Media-keys mock
       });
@@ -101,9 +97,9 @@ describe('EMEController', () => {
 
     media.emit('encrypted', badData);
 
-    setTimeout(() => {
-      assert.equal(emeController.hls.trigger.args[0][1].details, ErrorDetails.KEY_SYSTEM_NO_KEYS);
-      assert.equal(emeController.hls.trigger.args[1][1].details, ErrorDetails.KEY_SYSTEM_NO_ACCESS);
+    setTimeout(function () {
+      expect(emeController.hls.trigger.args[0][1].details).to.equal(ErrorDetails.KEY_SYSTEM_NO_KEYS);
+      expect(emeController.hls.trigger.args[1][1].details).to.equal(ErrorDetails.KEY_SYSTEM_NO_ACCESS);
       done();
     }, 0);
   });
diff --git a/tests/unit/controller/ewma-bandwidth-estimator.js b/tests/unit/controller/ewma-bandwidth-estimator.js
index 9dba60ef148..6d791f736db 100644
--- a/tests/unit/controller/ewma-bandwidth-estimator.js
+++ b/tests/unit/controller/ewma-bandwidth-estimator.js
@@ -1,45 +1,43 @@
 import EwmaBandWidthEstimator from '../../../src/utils/ewma-bandwidth-estimator';
 import Hls from '../../../src/hls';
 
-const assert = require('assert');
-
-describe('EwmaBandWidthEstimator', () => {
-  it('returns default estimate if bw estimator not available yet', () => {
+describe('EwmaBandWidthEstimator', function () {
+  it('returns default estimate if bw estimator not available yet', function () {
     let defaultEstimate = 5e5;
     let bwEstimator = new EwmaBandWidthEstimator(new Hls(), 0, 0, defaultEstimate);
-    assert.equal(bwEstimator.getEstimate(), 5e5);
+    expect(bwEstimator.getEstimate()).to.equal(5e5);
   });
 
-  it('returns last bitrate is fast=slow=0', () => {
+  it('returns last bitrate is fast=slow=0', function () {
     let defaultEstimate = 5e5;
     let bwEstimator = new EwmaBandWidthEstimator(new Hls(), 0, 0, defaultEstimate);
     bwEstimator.sample(8000, 1000000);
-    assert.equal(bwEstimator.getEstimate(), 1000000);
+    expect(bwEstimator.getEstimate()).to.equal(1000000);
     bwEstimator.sample(4000, 1000000);
-    assert.equal(bwEstimator.getEstimate(), 2000000);
+    expect(bwEstimator.getEstimate()).to.equal(2000000);
     bwEstimator.sample(1000, 1000000);
-    assert.equal(bwEstimator.getEstimate(), 8000000);
+    expect(bwEstimator.getEstimate()).to.equal(8000000);
   });
 
-  it('returns correct value bitrate is slow=15,fast=4', () => {
+  it('returns correct value bitrate is slow=15,fast=4', function () {
     let defaultEstimate = 5e5;
     let bwEstimator = new EwmaBandWidthEstimator(new Hls(), 15, 4, defaultEstimate);
     bwEstimator.sample(8000, 1000000);
-    assert.equal(bwEstimator.getEstimate(), 1000000);
+    expect(bwEstimator.getEstimate()).to.equal(1000000);
     bwEstimator.sample(4000, 1000000);
-    assert.equal(Math.round(bwEstimator.getEstimate()), 1396480);
+    expect(bwEstimator.getEstimate()).to.equal(1396480.1544736226);
     bwEstimator.sample(1000, 1000000);
-    assert.equal(Math.round(bwEstimator.getEstimate()), 2056827);
+    expect(bwEstimator.getEstimate()).to.equal(2056826.9489827948);
   });
 
-  it('returns correct value bitrate is slow=9,fast=5', () => {
+  it('returns correct value bitrate is slow=9,fast=5', function () {
     let defaultEstimate = 5e5;
     let bwEstimator = new EwmaBandWidthEstimator(new Hls(), 9, 5, defaultEstimate);
     bwEstimator.sample(8000, 1000000);
-    assert.equal(bwEstimator.getEstimate(), 1000000);
+    expect(bwEstimator.getEstimate()).to.equal(1000000);
     bwEstimator.sample(4000, 1000000);
-    assert.equal(Math.round(bwEstimator.getEstimate()), 1439580);
+    expect(bwEstimator.getEstimate()).to.equal(1439580.319105247);
     bwEstimator.sample(1000, 1000000);
-    assert.equal(Math.round(bwEstimator.getEstimate()), 2208342);
+    expect(bwEstimator.getEstimate()).to.equal(2208342.324322311);
   });
 });
diff --git a/tests/unit/controller/fragment-finders.js b/tests/unit/controller/fragment-finders.js
index 8db86580b53..fbda7b272cd 100644
--- a/tests/unit/controller/fragment-finders.js
+++ b/tests/unit/controller/fragment-finders.js
@@ -1,11 +1,9 @@
-import assert from 'assert';
-import sinon from 'sinon';
 import { findFragmentByPDT, findFragmentByPTS, fragmentWithinToleranceTest, pdtWithinToleranceTest } from '../../../src/controller/fragment-finders';
 import { mockFragments } from '../../mocks/data';
 import BinarySearch from '../../../src/utils/binary-search';
 
 describe('Fragment finders', function () {
-  const sandbox = sinon.sandbox.create();
+  const sandbox = sinon.createSandbox();
   afterEach(function () {
     sandbox.restore();
   });
@@ -29,22 +27,22 @@ describe('Fragment finders', function () {
     });
 
     it('finds a fragment with SN sequential to the previous fragment', function () {
-      const foundFragment = findFragmentByPTS(fragPrevious, mockFragments, bufferEnd, tolerance);
-      const resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.equal(foundFragment, mockFragments[3], 'Expected sn 3, found sn segment ' + resultSN);
-      assert(binarySearchSpy.notCalled);
+      const actual = findFragmentByPTS(fragPrevious, mockFragments, bufferEnd, tolerance);
+      const resultSN = actual ? actual.sn : -1;
+      expect(actual).to.equal(mockFragments[3], 'Expected sn 3, found sn segment ' + resultSN);
+      expect(binarySearchSpy).to.have.not.been.called;
     });
 
     it('chooses the fragment with the next SN if its contiguous with the end of the buffer', function () {
       const actual = findFragmentByPTS(mockFragments[0], mockFragments, mockFragments[0].duration, tolerance);
-      assert.strictEqual(mockFragments[1], actual, `expected sn ${mockFragments[1].sn}, but got sn ${actual ? actual.sn : null}`);
-      assert(binarySearchSpy.notCalled);
+      expect(actual).to.equal(mockFragments[1], `expected sn ${mockFragments[1].sn}, but got sn ${actual ? actual.sn : null}`);
+      expect(binarySearchSpy).to.have.not.been.called;
     });
 
     it('uses BinarySearch to find a fragment if the subsequent one is not within tolerance', function () {
       const fragments = [mockFragments[0], mockFragments[(mockFragments.length - 1)]];
       findFragmentByPTS(fragments[0], fragments, bufferEnd, tolerance);
-      assert(binarySearchSpy.calledOnce);
+      expect(binarySearchSpy).to.have.been.calledOnce;
     });
   });
 
@@ -56,7 +54,7 @@ describe('Fragment finders', function () {
         duration: 5 - tolerance
       };
       const actual = fragmentWithinToleranceTest(5, tolerance, frag);
-      assert.strictEqual(0, actual);
+      expect(actual).to.equal(0);
     });
 
     it('returns 0 if the fragment range is greater than end of the buffer', function () {
@@ -65,7 +63,7 @@ describe('Fragment finders', function () {
         duration: 5
       };
       const actual = fragmentWithinToleranceTest(5, tolerance, frag);
-      assert.strictEqual(0, actual);
+      expect(actual).to.equal(0);
     });
 
     it('returns 1 if the fragment range is less than the end of the buffer', function () {
@@ -74,7 +72,7 @@ describe('Fragment finders', function () {
         duration: 5
       };
       const actual = fragmentWithinToleranceTest(5, tolerance, frag);
-      assert.strictEqual(1, actual);
+      expect(actual).to.equal(1);
     });
 
     it('returns -1 if the fragment range is greater than the end of the buffer', function () {
@@ -83,7 +81,7 @@ describe('Fragment finders', function () {
         duration: 5
       };
       const actual = fragmentWithinToleranceTest(5, tolerance, frag);
-      assert.strictEqual(-1, actual);
+      expect(actual).to.equal(-1);
     });
 
     it('does not skip very small fragments', function () {
@@ -93,37 +91,34 @@ describe('Fragment finders', function () {
         deltaPTS: 0.1
       };
       const actual = fragmentWithinToleranceTest(0, tolerance, frag);
-      assert.strictEqual(0, actual);
+      expect(actual).to.equal(0);
     });
   });
 
   describe('findFragmentByPDT', function () {
     it('finds a fragment with endProgramDateTime greater than the reference PDT', function () {
       const foundFragment = findFragmentByPDT(mockFragments, fragPrevious.endProgramDateTime + 1);
-      const resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.strictEqual(foundFragment, mockFragments[2], 'Expected sn 2, found sn segment ' + resultSN);
+      expect(foundFragment).to.equal(mockFragments[2]);
     });
 
     it('returns null when the reference pdt is outside of the pdt range of the fragment array', function () {
       let foundFragment = findFragmentByPDT(mockFragments, mockFragments[0].programDateTime - 1);
-      let resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.strictEqual(foundFragment, null, 'Expected sn -1, found sn segment ' + resultSN);
+      expect(foundFragment).to.not.exist;
 
       foundFragment = findFragmentByPDT(mockFragments, mockFragments[mockFragments.length - 1].endProgramDateTime + 1);
-      resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.strictEqual(foundFragment, null, 'Expected sn -1, found sn segment ' + resultSN);
+      expect(foundFragment).to.not.exist;
     });
 
     it('is able to find the first fragment', function () {
       const foundFragment = findFragmentByPDT(mockFragments, mockFragments[0].programDateTime);
       const resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.strictEqual(foundFragment, mockFragments[0], 'Expected sn 0, found sn segment ' + resultSN);
+      expect(foundFragment).to.equal(mockFragments[0], 'Expected sn 0, found sn segment ' + resultSN);
     });
 
     it('is able to find the last fragment', function () {
       const foundFragment = findFragmentByPDT(mockFragments, mockFragments[mockFragments.length - 1].programDateTime);
       const resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.strictEqual(foundFragment, mockFragments[4], 'Expected sn 4, found sn segment ' + resultSN);
+      expect(foundFragment).to.equal(mockFragments[4], 'Expected sn 4, found sn segment ' + resultSN);
     });
 
     it('is able to find a fragment if the PDT value is 0', function () {
@@ -140,17 +135,17 @@ describe('Fragment finders', function () {
         }
       ];
       const actual = findFragmentByPDT(fragments, 0);
-      assert.strictEqual(fragments[0], actual);
+      expect(actual).to.equal(fragments[0]);
     });
 
     it('returns null when passed undefined arguments', function () {
-      assert.strictEqual(findFragmentByPDT(mockFragments), null);
-      assert.strictEqual(findFragmentByPDT(undefined, 9001), null);
-      assert.strictEqual(findFragmentByPDT(), null);
+      expect(findFragmentByPDT(mockFragments)).to.not.exist;
+      expect(findFragmentByPDT(undefined, 9001)).to.not.exist;
+      expect(findFragmentByPDT()).to.not.exist;
     });
 
     it('returns null when passed an empty frag array', function () {
-      assert.strictEqual(findFragmentByPDT([], 9001), null);
+      expect(findFragmentByPDT([], 9001)).to.not.exist;
     });
   });
 
@@ -164,7 +159,7 @@ describe('Fragment finders', function () {
         duration: 5
       };
       const actual = pdtWithinToleranceTest(pdtBufferEnd, tolerance, frag);
-      assert.strictEqual(true, actual);
+      expect(actual).to.be.true;
     });
 
     it('returns false if the fragment range is less than the end of the buffer', function () {
@@ -174,7 +169,7 @@ describe('Fragment finders', function () {
         duration: 5
       };
       const actual = pdtWithinToleranceTest(pdtBufferEnd, tolerance, frag);
-      assert.strictEqual(false, actual);
+      expect(actual).to.be.false;
     });
 
     it('does not skip very small fragments', function () {
@@ -185,7 +180,7 @@ describe('Fragment finders', function () {
         deltaPTS: 0.1
       };
       const actual = pdtWithinToleranceTest(pdtBufferEnd, tolerance, frag);
-      assert.strictEqual(true, actual);
+      expect(actual).to.be.true;
     });
 
     it('accounts for tolerance when checking the endProgramDateTime of the fragment', function () {
@@ -195,7 +190,7 @@ describe('Fragment finders', function () {
         duration: 5
       };
       const actual = pdtWithinToleranceTest(pdtBufferEnd, tolerance, frag);
-      assert.strictEqual(false, actual);
+      expect(actual).to.be.false;
     });
   });
 });
diff --git a/tests/unit/controller/fragment-tracker.js b/tests/unit/controller/fragment-tracker.js
index 1d115d30db1..b557cd31b8f 100644
--- a/tests/unit/controller/fragment-tracker.js
+++ b/tests/unit/controller/fragment-tracker.js
@@ -3,8 +3,6 @@ import Event from '../../../src/events';
 import { FragmentTracker, FragmentState } from '../../../src/controller/fragment-tracker';
 import PlaylistLoader from '../../../src/loader/playlist-loader';
 
-const assert = require('assert');
-
 const LevelType = PlaylistLoader.LevelType;
 
 function createMockBuffer (buffered) {
@@ -41,8 +39,8 @@ function loadFragmentAndBuffered (hls, fragment) {
   loadFragment(hls, fragment);
   hls.trigger(Event.FRAG_BUFFERED, { frag: fragment });
 }
-describe('FragmentTracker', () => {
-  describe('getPartialFragment', () => {
+describe('FragmentTracker', function () {
+  describe('getPartialFragment', function () {
     let hls, fragmentTracker, fragment, buffered, partialFragment, timeRanges;
 
     hls = new Hls({});
@@ -72,28 +70,28 @@ describe('FragmentTracker', () => {
 
     hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-    it('detects fragments that partially loaded', () => {
+    it('detects fragments that partially loaded', function () {
       // Get the partial fragment at a time
       partialFragment = fragmentTracker.getPartialFragment(0);
-      assert.strictEqual(partialFragment, fragment);
+      expect(partialFragment).to.equal(fragment);
       partialFragment = fragmentTracker.getPartialFragment(0.5);
-      assert.strictEqual(partialFragment, fragment);
+      expect(partialFragment).to.equal(fragment);
       partialFragment = fragmentTracker.getPartialFragment(1);
-      assert.strictEqual(partialFragment, fragment);
+      expect(partialFragment).to.equal(fragment);
     });
-    it('returns null when time is not inside partial fragment', () => {
+    it('returns null when time is not inside partial fragment', function () {
       partialFragment = fragmentTracker.getPartialFragment(1.5);
-      assert.strictEqual(partialFragment, null);
+      expect(partialFragment).to.not.exist;
     });
   });
 
-  describe('getState', () => {
+  describe('getState', function () {
     let hls, fragmentTracker, fragment, buffered, timeRanges;
 
     hls = new Hls({});
     fragmentTracker = new FragmentTracker(hls);
 
-    let addFragment = () => {
+    let addFragment = function () {
       fragment = createMockFragment({
         startPTS: 0,
         endPTS: 1,
@@ -104,12 +102,12 @@ describe('FragmentTracker', () => {
       hls.trigger(Event.FRAG_LOADED, { frag: fragment });
     };
 
-    it('detects fragments that never loaded', () => {
+    it('detects fragments that never loaded', function () {
       addFragment();
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.APPENDING);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.APPENDING);
     });
 
-    it('detects fragments that loaded properly', () => {
+    it('detects fragments that loaded properly', function () {
       addFragment();
       buffered = createMockBuffer([
         {
@@ -125,10 +123,10 @@ describe('FragmentTracker', () => {
 
       hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.OK);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.OK);
     });
 
-    it('detects partial fragments', () => {
+    it('detects partial fragments', function () {
       addFragment();
       buffered = createMockBuffer([
         {
@@ -143,10 +141,10 @@ describe('FragmentTracker', () => {
 
       hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.PARTIAL);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.PARTIAL);
     });
 
-    it('removes evicted partial fragments', () => {
+    it('removes evicted partial fragments', function () {
       addFragment();
       buffered = createMockBuffer([
         {
@@ -161,7 +159,7 @@ describe('FragmentTracker', () => {
 
       hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.PARTIAL);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.PARTIAL);
 
       // Trim the buffer
       buffered = createMockBuffer([
@@ -175,7 +173,7 @@ describe('FragmentTracker', () => {
       timeRanges['audio'] = buffered;
       hls.trigger(Event.BUFFER_APPENDED, { timeRanges });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.NOT_LOADED);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.NOT_LOADED);
     });
   });
 
@@ -183,7 +181,7 @@ describe('FragmentTracker', () => {
     let hls;
     /** @type {FragmentTracker} */
     let fragmentTracker;
-    beforeEach(() => {
+    beforeEach(function () {
       hls = new Hls({});
       fragmentTracker = new FragmentTracker(hls);
     });
@@ -218,14 +216,14 @@ describe('FragmentTracker', () => {
       fragments.forEach(fragment => {
         loadFragmentAndBuffered(hls, fragment);
       });
-      assert.deepEqual(fragmentTracker.getBufferedFrag(0.0, LevelType.MAIN), fragments[0]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(0.1, LevelType.MAIN), fragments[0]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(1.0, LevelType.MAIN), fragments[1]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(1.1, LevelType.MAIN), fragments[1]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(2.0, LevelType.MAIN), fragments[2]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(2.1, LevelType.MAIN), fragments[2]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(2.9, LevelType.MAIN), fragments[2]);
-      assert.deepEqual(fragmentTracker.getBufferedFrag(3.0, LevelType.MAIN), fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(0.0, LevelType.MAIN)).to.equal(fragments[0]);
+      expect(fragmentTracker.getBufferedFrag(0.1, LevelType.MAIN)).to.equal(fragments[0]);
+      expect(fragmentTracker.getBufferedFrag(1.0, LevelType.MAIN)).to.equal(fragments[1]);
+      expect(fragmentTracker.getBufferedFrag(1.1, LevelType.MAIN)).to.equal(fragments[1]);
+      expect(fragmentTracker.getBufferedFrag(2.0, LevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(2.1, LevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(2.9, LevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(3.0, LevelType.MAIN)).to.equal(fragments[2]);
     });
     it('should return null if found it, but it is not buffered', function () {
       const fragments = [
@@ -258,10 +256,10 @@ describe('FragmentTracker', () => {
       fragments.forEach(fragment => {
         loadFragment(hls, fragment);
       });
-      assert.strictEqual(fragmentTracker.getBufferedFrag(0, LevelType.MAIN), null);
-      assert.strictEqual(fragmentTracker.getBufferedFrag(1, LevelType.MAIN), null);
-      assert.strictEqual(fragmentTracker.getBufferedFrag(2, LevelType.MAIN), null);
-      assert.strictEqual(fragmentTracker.getBufferedFrag(3, LevelType.MAIN), null);
+      expect(fragmentTracker.getBufferedFrag(0, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(1, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(2, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(3, LevelType.MAIN)).to.not.exist;
     });
     it('should return null if anyone does not match the position', function () {
       loadFragmentAndBuffered(hls, createMockFragment({
@@ -272,10 +270,10 @@ describe('FragmentTracker', () => {
         type: 'main'
       }, ['audio', 'video']));
       // not found
-      assert.strictEqual(fragmentTracker.getBufferedFrag(1.1, LevelType.MAIN), null);
+      expect(fragmentTracker.getBufferedFrag(1.1, LevelType.MAIN)).to.not.exist;
     });
     it('should return null if fragmentTracker not have any fragments', function () {
-      assert.strictEqual(fragmentTracker.getBufferedFrag(0, LevelType.MAIN), null);
+      expect(fragmentTracker.getBufferedFrag(0, LevelType.MAIN)).to.not.exist;
     });
     it('should return null if not found match levelType', function () {
       loadFragmentAndBuffered(hls, createMockFragment({
@@ -286,17 +284,17 @@ describe('FragmentTracker', () => {
         type: LevelType.AUDIO // <= level type is not "main"
       }, ['audio', 'video']));
 
-      assert.strictEqual(fragmentTracker.getBufferedFrag(0, LevelType.MAIN), null);
+      expect(fragmentTracker.getBufferedFrag(0, LevelType.MAIN)).to.not.exist;
     });
   });
 
-  describe('onFragBuffered', () => {
+  describe('onFragBuffered', function () {
     let hls, fragmentTracker, fragment, timeRanges;
 
     hls = new Hls({});
     fragmentTracker = new FragmentTracker(hls);
 
-    it('supports audio buffer', () => {
+    it('supports audio buffer', function () {
       fragment = createMockFragment({
         startPTS: 0,
         endPTS: 1,
@@ -323,10 +321,10 @@ describe('FragmentTracker', () => {
 
       hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.PARTIAL);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.PARTIAL);
     });
 
-    it('supports video buffer', () => {
+    it('supports video buffer', function () {
       fragment = createMockFragment({
         startPTS: 0,
         endPTS: 1,
@@ -353,10 +351,10 @@ describe('FragmentTracker', () => {
 
       hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.PARTIAL);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.PARTIAL);
     });
 
-    it('supports audio only buffer', () => {
+    it('supports audio only buffer', function () {
       fragment = createMockFragment({
         startPTS: 0,
         endPTS: 1,
@@ -383,20 +381,20 @@ describe('FragmentTracker', () => {
 
       hls.trigger(Event.FRAG_BUFFERED, { stats: { aborted: true }, id: 'main', frag: fragment });
 
-      assert.strictEqual(fragmentTracker.getState(fragment), FragmentState.OK);
+      expect(fragmentTracker.getState(fragment)).to.equal(FragmentState.OK);
     });
   });
 
-  describe('removeFragment', () => {
+  describe('removeFragment', function () {
     /** @type {Hls} */
     let hls;
     /** @type {FragmentTracker} */
     let fragmentTracker;
-    beforeEach(() => {
+    beforeEach(function () {
       hls = new Hls({});
       fragmentTracker = new FragmentTracker(hls);
     });
-    it('should remove fragment', () => {
+    it('should remove fragment', function () {
       const fragment = createMockFragment({
         startPTS: 0,
         endPTS: 1,
@@ -406,23 +404,23 @@ describe('FragmentTracker', () => {
       }, ['audio', 'video']);
       // load fragments to buffered
       loadFragmentAndBuffered(hls, fragment);
-      assert.strictEqual(fragmentTracker.hasFragment(fragment), true);
+      expect(fragmentTracker.hasFragment(fragment)).to.be.true;
       // Remove the fragment
       fragmentTracker.removeFragment(fragment);
       // Check
-      assert.strictEqual(fragmentTracker.hasFragment(fragment), false);
+      expect(fragmentTracker.hasFragment(fragment)).to.be.false;
     });
   });
-  describe('removeAllFragments', () => {
+  describe('removeAllFragments', function () {
     /** @type {Hls} */
     let hls;
     /** @type {FragmentTracker} */
     let fragmentTracker;
-    beforeEach(() => {
+    beforeEach(function () {
       hls = new Hls({});
       fragmentTracker = new FragmentTracker(hls);
     });
-    it('should remove all fragments', () => {
+    it('should remove all fragments', function () {
       const fragments = [
         // 0-1
         createMockFragment({
@@ -455,13 +453,13 @@ describe('FragmentTracker', () => {
       });
       // before
       fragments.forEach(fragment => {
-        assert.strictEqual(fragmentTracker.hasFragment(fragment), true);
+        expect(fragmentTracker.hasFragment(fragment)).to.be.true;
       });
       // Remove all fragments
       fragmentTracker.removeAllFragments();
       // after
       fragments.forEach(fragment => {
-        assert.strictEqual(fragmentTracker.hasFragment(fragment), false);
+        expect(fragmentTracker.hasFragment(fragment)).to.be.false;
       });
     });
   });
diff --git a/tests/unit/controller/gap-controller.js b/tests/unit/controller/gap-controller.js
index 01ca8065786..34c7c50d9ce 100644
--- a/tests/unit/controller/gap-controller.js
+++ b/tests/unit/controller/gap-controller.js
@@ -1,13 +1,7 @@
-import assert from 'assert';
-import sinon from 'sinon';
-
 import Hls from '../../../src/hls';
-
 import GapController from '../../../src/controller/gap-controller';
 import { FragmentTracker } from '../../../src/controller/fragment-tracker';
-
 import Event from '../../../src/events';
-
 import { ErrorTypes, ErrorDetails } from '../../../src/errors';
 
 describe('checkBuffer', function () {
@@ -15,7 +9,7 @@ describe('checkBuffer', function () {
   let config;
   let media;
   let triggerSpy;
-  const sandbox = sinon.sandbox.create();
+  const sandbox = sinon.createSandbox();
 
   beforeEach(function () {
     const hls = new Hls({});
@@ -34,42 +28,43 @@ describe('checkBuffer', function () {
       for (let i = 1; i < config.nudgeMaxRetry; i++) {
         let expected = media.currentTime + (i * config.nudgeOffset);
         gapController._tryNudgeBuffer();
-        assert.strictEqual(expected, media.currentTime);
+        expect(media.currentTime).to.equal(expected);
       }
-      assert(triggerSpy.alwaysCalledWith(Event.ERROR, {
+
+      expect(triggerSpy).to.have.been.calledWith(Event.ERROR, {
         type: ErrorTypes.MEDIA_ERROR,
         details: ErrorDetails.BUFFER_NUDGE_ON_STALL,
         fatal: false
-      }));
+      });
     });
 
     it('should not increment the currentTime if the max amount of nudges has been attempted', function () {
       config.nudgeMaxRetry = 0;
       gapController._tryNudgeBuffer();
-      assert.strictEqual(0, media.currentTime);
-      assert(triggerSpy.calledWith(Event.ERROR, {
+      expect(media.currentTime).to.equal(0);
+      expect(triggerSpy).to.have.been.calledWith(Event.ERROR, {
         type: ErrorTypes.MEDIA_ERROR,
         details: ErrorDetails.BUFFER_STALLED_ERROR,
         fatal: true
-      }));
+      });
     });
   });
 
   describe('_reportStall', function () {
     it('should report a stall with the current buffer length if it has not already been reported', function () {
       gapController._reportStall(42);
-      assert(triggerSpy.calledWith(Event.ERROR, {
+      expect(triggerSpy).to.have.been.calledWith(Event.ERROR, {
         type: ErrorTypes.MEDIA_ERROR,
         details: ErrorDetails.BUFFER_STALLED_ERROR,
         fatal: false,
         buffer: 42
-      }));
+      });
     });
 
     it('should not report a stall if it was already reported', function () {
       gapController.stallReported = true;
       gapController._reportStall(42);
-      assert(triggerSpy.notCalled);
+      expect(triggerSpy).to.not.have.been.called;
     });
   });
 
@@ -79,7 +74,7 @@ describe('checkBuffer', function () {
       const mockStallDuration = (config.highBufferWatchdogPeriod + 1) * 1000;
       const nudgeStub = sandbox.stub(gapController, '_tryNudgeBuffer');
       gapController._tryFixBufferStall(mockBufferInfo, mockStallDuration);
-      assert(nudgeStub.calledOnce);
+      expect(nudgeStub).to.have.been.calledOnce;
     });
 
     it('should not nudge when briefly stalling close to the buffer end', function () {
@@ -87,7 +82,7 @@ describe('checkBuffer', function () {
       const mockStallDuration = (config.highBufferWatchdogPeriod / 2) * 1000;
       const nudgeStub = sandbox.stub(gapController, '_tryNudgeBuffer');
       gapController._tryFixBufferStall(mockBufferInfo, mockStallDuration);
-      assert(nudgeStub.notCalled);
+      expect(nudgeStub).to.have.not.been.called;
     });
 
     it('should not nudge when too far from the buffer end', function () {
@@ -95,21 +90,21 @@ describe('checkBuffer', function () {
       const mockStallDuration = (config.highBufferWatchdogPeriod + 1) * 1000;
       const nudgeStub = sandbox.stub(gapController, '_tryNudgeBuffer');
       gapController._tryFixBufferStall(mockBufferInfo, mockStallDuration);
-      assert(nudgeStub.notCalled);
+      expect(nudgeStub).to.have.not.been.called;
     });
 
     it('should try to jump partial fragments when detected', function () {
       sandbox.stub(gapController.fragmentTracker, 'getPartialFragment').returns({});
       const skipHoleStub = sandbox.stub(gapController, '_trySkipBufferHole');
       gapController._tryFixBufferStall({ len: 0 });
-      assert(skipHoleStub.calledOnce);
+      expect(skipHoleStub).to.have.been.calledOnce;
     });
 
     it('should not try to jump partial fragments when none are detected', function () {
       sandbox.stub(gapController.fragmentTracker, 'getPartialFragment').returns(null);
       const skipHoleStub = sandbox.stub(gapController, '_trySkipBufferHole');
       gapController._tryFixBufferStall({ len: 0 });
-      assert(skipHoleStub.notCalled);
+      expect(skipHoleStub).to.have.not.been.called;
     });
   });
 
@@ -149,11 +144,11 @@ describe('checkBuffer', function () {
       gapController.poll(lastCurrentTime, buffered);
 
       // The first poll call made while stalling just sets stall flags
-      assert.strictEqual(typeof gapController.stalled, 'number');
-      assert.strictEqual(gapController.stallReported, false);
+      expect(gapController.stalled).to.be.a('number');
+      expect(gapController.stallReported).to.be.false;
 
       gapController.poll(lastCurrentTime, buffered);
-      assert(fixStallStub.calledOnce);
+      expect(fixStallStub).to.have.been.calledOnce;
     });
 
     it('should reset stall flags when no longer stalling', function () {
@@ -164,10 +159,10 @@ describe('checkBuffer', function () {
       const fixStallStub = sandbox.stub(gapController, '_tryFixBufferStall');
       gapController.poll(lastCurrentTime, buffered);
 
-      assert.strictEqual(gapController.stalled, null);
-      assert.strictEqual(gapController.nudgeRetry, 0);
-      assert.strictEqual(gapController.stallReported, false);
-      assert(fixStallStub.notCalled);
+      expect(gapController.stalled).to.not.exist;
+      expect(gapController.nudgeRetry).to.equal(0);
+      expect(gapController.stallReported).to.be.false;
+      expect(fixStallStub).to.not.have.been.called;
     });
 
     it('should trigger reportStall when stalling for 1 second or longer', function () {
@@ -176,10 +171,10 @@ describe('checkBuffer', function () {
       clock.tick(1000);
       gapController.stalled = 1;
       gapController.poll(lastCurrentTime, buffered);
-      assert(reportStallSpy.notCalled);
+      expect(reportStallSpy).to.not.have.been.called;
       clock.tick(1001);
       gapController.poll(lastCurrentTime, buffered);
-      assert(reportStallSpy.calledOnce);
+      expect(reportStallSpy).to.have.been.calledOnce;
     });
   });
 });
diff --git a/tests/unit/controller/level-controller.js b/tests/unit/controller/level-controller.js
index 0b1d88f9d02..9e6a861af77 100644
--- a/tests/unit/controller/level-controller.js
+++ b/tests/unit/controller/level-controller.js
@@ -1,37 +1,27 @@
 import LevelController from '../../../src/controller/level-controller';
 import HlsMock from '../../mocks/hls.mock';
 import Event from '../../../src/events';
-import { ErrorDetails } from '../../../src/errors';
+import { ErrorDetails, ErrorTypes } from '../../../src/errors';
 
-const assert = require('assert');
+describe('LevelController', function () {
+  const sandbox = sinon.createSandbox();
+  let hls;
+  let levelController;
+  let triggerSpy;
 
-describe('LevelController', () => {
-  let hls, levelController;
-
-  beforeEach(() => {
-    hls = new HlsMock();
+  beforeEach(function () {
+    hls = new HlsMock({}, sandbox);
     levelController = new LevelController(hls);
+    triggerSpy = hls.trigger;
   });
 
-  afterEach(() => {
-    hls.destroy();
+  afterEach(function () {
     hls = null;
     levelController = null;
+    sandbox.restore();
   });
 
-  it('should trigger an error when no levels are found in the manifest', () => {
-    levelController.onManifestLoaded({
-      audioTracks: [],
-      levels: [],
-      networkDetails: '',
-      subtitles: [],
-      url: 'https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'
-    });
-
-    assert.equal(levelController.hls.trigger.args[0][1].details, ErrorDetails.MANIFEST_INCOMPATIBLE_CODECS_ERROR);
-  });
-
-  it('should trigger hlsManifestParsed when levels are found in the manifest', () => {
+  it('should trigger level switch when level is manually set', function () {
     let data = {
       audioTracks: [],
       levels: [
@@ -44,39 +34,100 @@ describe('LevelController', () => {
       ],
       networkDetails: '',
       subtitles: [],
-      stats: {},
       url: 'https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'
     };
 
+    let nextLevel = 1;
+
     levelController.onManifestLoaded(data);
+    levelController.level = nextLevel;
 
-    assert.equal(levelController.hls.trigger.args[0][0], Event.MANIFEST_PARSED);
-    assert.equal(levelController.hls.trigger.args[0][1].levels.length, data.levels.length);
+    expect(triggerSpy).to.have.been.calledWith(Event.LEVEL_SWITCHING, {
+      bitrate: 246440,
+      details: data.levels[1].details,
+      fragmentError: false,
+      level: 1,
+      loadError: 0,
+      name: '240',
+      url: [undefined],
+      urlId: 0
+    });
   });
 
-  it('should trigger level switch when level is manually set', () => {
-    let data = {
-      audioTracks: [],
-      levels: [
-        { bitrate: 105000, name: '144', details: { totalduration: 10, fragments: [{}] } },
-        { bitrate: 246440, name: '240', details: { totalduration: 10, fragments: [{}] } },
-        { bitrate: 460560, name: '380', details: { totalduration: 10, fragments: [{}] } },
-        { bitrate: 836280, name: '480', details: { totalduration: 10, fragments: [{}] } },
-        { bitrate: 2149280, name: '720', details: { totalduration: 10, fragments: [{}] } },
-        { bitrate: 6221600, name: '1080', details: { totalduration: 10, fragments: [{}] } }
-      ],
-      networkDetails: '',
-      subtitles: [],
-      url: 'https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'
-    };
+  describe('onManifestLoaded handler', function () {
+    it('should trigger an error when no levels are found in the manifest', function () {
+      levelController.onManifestLoaded({
+        audioTracks: [],
+        levels: [],
+        networkDetails: '',
+        subtitles: [],
+        url: 'https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'
+      });
+
+      expect(triggerSpy).to.have.been.calledWith(Event.ERROR, {
+        type: ErrorTypes.MEDIA_ERROR,
+        details: ErrorDetails.MANIFEST_INCOMPATIBLE_CODECS_ERROR,
+        fatal: true,
+        url: undefined,
+        reason: 'no level with compatible codecs found in manifest'
+      });
+    });
 
-    let nextLevel = 1;
+    it('should trigger hlsManifestParsed when levels are found in the manifest', function () {
+      let data = {
+        audioTracks: [],
+        levels: [
+          { bitrate: 105000, name: '144', details: { totalduration: 10, fragments: [{}] } },
+          { bitrate: 246440, name: '240', details: { totalduration: 10, fragments: [{}] } },
+          { bitrate: 460560, name: '380', details: { totalduration: 10, fragments: [{}] } },
+          { bitrate: 836280, name: '480', details: { totalduration: 10, fragments: [{}] } },
+          { bitrate: 2149280, name: '720', details: { totalduration: 10, fragments: [{}] } },
+          { bitrate: 6221600, name: '1080', details: { totalduration: 10, fragments: [{}] } }
+        ],
+        networkDetails: '',
+        subtitles: [],
+        stats: {},
+        url: 'https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'
+      };
 
-    levelController.onManifestLoaded(data);
-    levelController.level = nextLevel;
+      levelController.onManifestLoaded(data);
+
+      expect(triggerSpy).to.have.been.calledWith(Event.MANIFEST_PARSED, {
+        altAudio: false,
+        audio: false,
+        audioTracks: [],
+        firstLevel: 0,
+        levels: data.levels,
+        stats: {},
+        video: false
+      });
+    });
+
+    it.skip('should signal altAudio if present in the manifest', function () {
+      let data = {
+        audioTracks: [
+          { audioCodec: 'mp4a.40.5' }
+        ],
+        levels: [
+          { bitrate: 105000, name: '144', details: { totalduration: 10, fragments: [{}] } }
+        ],
+        networkDetails: '',
+        subtitles: [],
+        stats: {},
+        url: 'https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'
+      };
 
-    assert.equal(levelController.hls.trigger.args[1][0], Event.LEVEL_SWITCHING);
-    assert.equal(levelController.hls.trigger.args[1][1].level, nextLevel);
+      levelController.onManifestLoaded(data);
+      expect(triggerSpy).to.have.been.calledWith(Event.MANIFEST_PARSED, {
+        altAudio: true,
+        audio: false,
+        audioTracks: [],
+        firstLevel: 0,
+        levels: data.levels,
+        stats: {},
+        video: false
+      });
+    });
   });
 
   describe('manifest parsing', function () {
@@ -96,10 +147,10 @@ describe('LevelController', () => {
       levelController.onManifestLoaded(data);
 
       const { name, payload } = hls.getEventData(0);
-      assert.strictEqual(name, Event.MANIFEST_PARSED);
-      assert.strictEqual(payload.video, true);
-      assert.strictEqual(payload.audio, false);
-      assert.strictEqual(payload.altAudio, false);
+      expect(name).to.equal(Event.MANIFEST_PARSED);
+      expect(payload.video).to.equal(true);
+      expect(payload.audio).to.equal(false);
+      expect(payload.altAudio).to.equal(false);
     });
 
     it('signals audio if there is an audioCodec signaled', function () {
@@ -107,10 +158,10 @@ describe('LevelController', () => {
       levelController.onManifestLoaded(data);
 
       const { name, payload } = hls.getEventData(0);
-      assert.strictEqual(name, Event.MANIFEST_PARSED);
-      assert.strictEqual(payload.video, false);
-      assert.strictEqual(payload.audio, true);
-      assert.strictEqual(payload.altAudio, false);
+      expect(name).to.equal(Event.MANIFEST_PARSED);
+      expect(payload.video).to.equal(false);
+      expect(payload.audio).to.equal(true);
+      expect(payload.altAudio).to.equal(false);
     });
 
     it('signals audio if the level is part of an audio group', function () {
@@ -122,10 +173,10 @@ describe('LevelController', () => {
       levelController.onManifestLoaded(data);
 
       const { name, payload } = hls.getEventData(0);
-      assert.strictEqual(name, Event.MANIFEST_PARSED);
-      assert.strictEqual(payload.video, false);
-      assert.strictEqual(payload.audio, true);
-      assert.strictEqual(payload.altAudio, false);
+      expect(name).to.equal(Event.MANIFEST_PARSED);
+      expect(payload.video).to.equal(false);
+      expect(payload.audio).to.equal(true);
+      expect(payload.altAudio).to.equal(false);
     });
 
     it('signals altAudio if there are audioTracks containing URIs', function () {
@@ -155,10 +206,10 @@ describe('LevelController', () => {
       levelController.onManifestLoaded(data);
 
       const { name, payload } = hls.getEventData(0);
-      assert.strictEqual(name, Event.MANIFEST_PARSED);
-      assert.strictEqual(payload.video, true);
-      assert.strictEqual(payload.audio, false);
-      assert.strictEqual(payload.altAudio, true);
+      expect(name).to.equal(Event.MANIFEST_PARSED);
+      expect(payload.video).to.equal(true);
+      expect(payload.audio).to.equal(false);
+      expect(payload.altAudio).to.equal(true);
     });
 
     it('does not signal altAudio if the audioTracks do no not contain any URIs', function () {
@@ -187,10 +238,10 @@ describe('LevelController', () => {
       levelController.onManifestLoaded(data);
 
       const { name, payload } = hls.getEventData(0);
-      assert.strictEqual(name, Event.MANIFEST_PARSED);
-      assert.strictEqual(payload.video, true);
-      assert.strictEqual(payload.audio, false);
-      assert.strictEqual(payload.altAudio, false);
+      expect(name).to.equal(Event.MANIFEST_PARSED);
+      expect(payload.video).to.equal(true);
+      expect(payload.audio).to.equal(false);
+      expect(payload.altAudio).to.equal(false);
     });
   });
 });
diff --git a/tests/unit/controller/level-helper.js b/tests/unit/controller/level-helper.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/unit/controller/stream-controller.js b/tests/unit/controller/stream-controller.js
index 93db8eacd71..3df11e27ca1 100644
--- a/tests/unit/controller/stream-controller.js
+++ b/tests/unit/controller/stream-controller.js
@@ -1,13 +1,13 @@
-import assert from 'assert';
-import sinon from 'sinon';
 import Hls from '../../../src/hls';
 import Event from '../../../src/events';
 import { FragmentTracker, FragmentState } from '../../../src/controller/fragment-tracker';
 import StreamController from '../../../src/controller/stream-controller';
 import { State } from '../../../src/controller/base-stream-controller';
-import M3U8Parser from '../../../src/loader/m3u8-parser';
 import { mockFragments } from '../../mocks/data';
 import Fragment from '../../../src/loader/fragment';
+import M3U8Parser from '../../../src/loader/m3u8-parser';
+
+import sinon from 'sinon';
 
 describe('StreamController', function () {
   let hls;
@@ -25,8 +25,8 @@ describe('StreamController', function () {
    * @param {StreamController} streamController
    */
   const assertStreamControllerStarted = (streamController) => {
-    assert.equal(streamController.hasInterval(), true, 'StreamController should start interval');
-    assert.notDeepEqual(streamController.state, State.STOPPED, 'StreamController\'s state should not be STOPPED');
+    expect(streamController.hasInterval()).to.be.true;
+    expect(streamController.state).to.equal(State.IDLE, 'StreamController\'s state should not be STOPPED');
   };
 
   /**
@@ -34,8 +34,8 @@ describe('StreamController', function () {
    * @param {StreamController} streamController
    */
   const assertStreamControllerStopped = (streamController) => {
-    assert.equal(streamController.hasInterval(), false, 'StreamController should stop interval');
-    assert.equal(streamController.state, State.STOPPED, 'StreamController\'s state should be STOPPED');
+    expect(streamController.hasInterval()).to.be.false;
+    expect(streamController.state).to.equal(State.STOPPED, 'StreamController\'s state should be STOPPED');
   };
 
   describe('StreamController', function () {
@@ -47,7 +47,7 @@ describe('StreamController', function () {
       const spy = sinon.spy();
       hls.on(Event.STREAM_STATE_TRANSITION, spy);
       streamController.state = State.ENDED;
-      assert.deepEqual(spy.args[0][1], { previousState: State.STOPPED, nextState: State.ENDED });
+      expect(spy.args[0][1]).to.deep.equal({ previousState: State.STOPPED, nextState: State.ENDED });
     });
 
     it('should not trigger STREAM_STATE_TRANSITION when state is not updated', function () {
@@ -55,10 +55,10 @@ describe('StreamController', function () {
       hls.on(Event.STREAM_STATE_TRANSITION, spy);
       // no update
       streamController.state = State.STOPPED;
-      assert.equal(spy.called, false);
+      expect(spy.called).to.be.false;
     });
 
-    it('should not start when controller have not levels data', function () {
+    it('should not start when controller does not have level data', function () {
       streamController.startLoad(1);
       assertStreamControllerStopped(streamController);
     });
@@ -105,19 +105,19 @@ describe('StreamController', function () {
     it('PTS search choosing wrong fragment (3 instead of 2) after level loaded', function () {
       let foundFragment = streamController._findFragment(0, fragPrevious, fragLen, mockFragments, bufferEnd, end, levelDetails);
       let resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.equal(foundFragment, mockFragments[3], 'Expected sn 3, found sn segment ' + resultSN);
+      expect(foundFragment).to.equal(mockFragments[3], 'Expected sn 3, found sn segment ' + resultSN);
     });
 
     // TODO: This test fails if using a real instance of Hls
     it('PTS search choosing the right segment if fragPrevious is not available', function () {
       let foundFragment = streamController._findFragment(0, null, fragLen, mockFragments, bufferEnd, end, levelDetails);
       let resultSN = foundFragment ? foundFragment.sn : -1;
-      assert.equal(foundFragment, mockFragments[3], 'Expected sn 2, found sn segment ' + resultSN);
+      expect(foundFragment).to.equal(mockFragments[3], 'Expected sn 3, found sn segment ' + resultSN);
     });
 
     it('returns the last fragment if the stream is fully buffered', function () {
       const actual = streamController._findFragment(0, null, mockFragments.length, mockFragments, end, end, levelDetails);
-      assert.strictEqual(actual, mockFragments[mockFragments.length - 1]);
+      expect(actual).to.equal(mockFragments[mockFragments.length - 1]);
     });
 
     describe('PDT Searching during a live stream', function () {
@@ -131,7 +131,7 @@ describe('StreamController', function () {
 
         let foundFragment = streamController._ensureFragmentAtLivePoint(levelDetails, bufferEnd, 0, end, fragPrevious, mockFragments, mockFragments.length);
         let resultSN = foundFragment ? foundFragment.sn : -1;
-        assert.equal(foundFragment, mockFragments[2], 'Expected sn 2, found sn segment ' + resultSN);
+        expect(foundFragment).to.equal(mockFragments[2], 'Expected sn 2, found sn segment ' + resultSN);
       });
 
       it('PDT search hitting empty discontinuity', function () {
@@ -139,7 +139,7 @@ describe('StreamController', function () {
 
         let foundFragment = streamController._ensureFragmentAtLivePoint(levelDetails, discontinuityPDTHit, 0, end, fragPrevious, mockFragments, mockFragments.length);
         let resultSN = foundFragment ? foundFragment.sn : -1;
-        assert.equal(foundFragment, mockFragments[2], 'Expected sn 2, found sn segment ' + resultSN);
+        expect(foundFragment).to.equal(mockFragments[2], 'Expected sn 2, found sn segment ' + resultSN);
       });
     });
   });
@@ -157,14 +157,13 @@ describe('StreamController', function () {
     });
 
     function assertLoadingState (frag) {
-      assert(triggerSpy.calledWith(Event.FRAG_LOADING, { frag }),
-        `Was expecting trigger to be called with FRAG_LOADING, but received ${triggerSpy.notCalled ? 'no calls' : triggerSpy.getCalls()}`);
-      assert.strictEqual(streamController.state, State.FRAG_LOADING);
+      expect(triggerSpy).to.have.been.calledWith(Event.FRAG_LOADING, { frag });
+      expect(streamController.state).to.equal(State.FRAG_LOADING);
     }
 
     function assertNotLoadingState () {
-      assert(triggerSpy.notCalled);
-      assert(hls.state !== State.FRAG_LOADING);
+      expect(triggerSpy).to.not.have.been.called;
+      expect(hls.state).to.not.equal(State.FRAG_LOADING);
     }
 
     it('should load a complete fragment which has not been previously appended', function () {
@@ -200,11 +199,11 @@ describe('StreamController', function () {
   });
 
   describe('checkBuffer', function () {
-    let sandbox;
+    const sandbox = sinon.createSandbox();
+
     beforeEach(function () {
-      sandbox = sinon.sandbox.create();
       streamController.gapController = {
-        poll: () => {}
+        poll: function () {}
       };
       streamController.media = {
         buffered: {
@@ -225,24 +224,24 @@ describe('StreamController', function () {
       const seekStub = sandbox.stub(streamController, '_seekToStartPos');
       streamController.loadedmetadata = false;
       streamController._checkBuffer();
-      assert(seekStub.calledOnce);
-      assert(streamController.loadedmetadata);
+      expect(seekStub).to.have.been.calledOnce;
+      expect(streamController.loadedmetadata).to.be.true;
     });
 
     it('should not seek to start pos when metadata has been loaded', function () {
       const seekStub = sandbox.stub(streamController, '_seekToStartPos');
       streamController.loadedmetadata = true;
       streamController._checkBuffer();
-      assert(seekStub.notCalled);
-      assert(streamController.loadedmetadata);
+      expect(seekStub).to.have.not.been.called;
+      expect(streamController.loadedmetadata).to.be.true;
     });
 
     it('should not seek to start pos when nothing has been buffered', function () {
       const seekStub = sandbox.stub(streamController, '_seekToStartPos');
       streamController.media.buffered.length = 0;
       streamController._checkBuffer();
-      assert(seekStub.notCalled);
-      assert.strictEqual(streamController.loadedmetadata, undefined);
+      expect(seekStub).to.have.not.been.called;
+      expect(streamController.loadedmetadata).to.not.exist;
     });
 
     it('should complete the immediate switch if signalled', function () {
@@ -250,21 +249,59 @@ describe('StreamController', function () {
       streamController.loadedmetadata = true;
       streamController.immediateSwitch = true;
       streamController._checkBuffer();
-      assert(levelSwitchStub.called);
+      expect(levelSwitchStub).to.have.been.calledOnce;
     });
 
     describe('_seekToStartPos', function () {
       it('should seek to startPosition when startPosition is not buffered & the media is not seeking', function () {
         streamController.startPosition = 5;
         streamController._seekToStartPos();
-        assert.strictEqual(5, streamController.media.currentTime);
+        expect(streamController.media.currentTime).to.equal(5);
       });
 
       it('should not seek to startPosition when it is buffered', function () {
         streamController.startPosition = 5;
         streamController.media.currentTime = 5;
         streamController._seekToStartPos();
-        assert.strictEqual(5, streamController.media.currentTime);
+        expect(streamController.media.currentTime).to.equal(5);
+      });
+    });
+
+    describe('startLoad', function () {
+      beforeEach(function () {
+        streamController.levels = [];
+        streamController.media = null;
+      });
+      it('should not start when controller does not have level data', function () {
+        streamController.levels = null;
+        streamController.startLoad();
+        assertStreamControllerStopped(streamController);
+      });
+
+      it('should start when controller has level data', function () {
+        streamController.startLoad(5);
+        assertStreamControllerStarted(streamController);
+        expect(streamController.nextLoadPosition).to.equal(5);
+        expect(streamController.startPosition).to.equal(5);
+        expect(streamController.lastCurrentTime).to.equal(5);
+      });
+
+      it('should set startPosition to lastCurrentTime if unset', function () {
+        streamController.lastCurrentTime = 5;
+        streamController.startLoad(-1);
+        assertStreamControllerStarted(streamController);
+        expect(streamController.nextLoadPosition).to.equal(5);
+        expect(streamController.startPosition).to.equal(5);
+        expect(streamController.lastCurrentTime).to.equal(5);
+      });
+
+      it('sets up for a bandwidth test if starting at auto', function () {
+        streamController.startFragRequested = false;
+        hls.startLevel = -1;
+
+        streamController.startLoad();
+        expect(streamController.level).to.equal(0);
+        expect(streamController.bitrateTest).to.be.true;
       });
     });
   });
diff --git a/tests/unit/controller/subtitle-stream-controller.js b/tests/unit/controller/subtitle-stream-controller.js
index 7a6e8112f16..3f4ee4eac70 100644
--- a/tests/unit/controller/subtitle-stream-controller.js
+++ b/tests/unit/controller/subtitle-stream-controller.js
@@ -1,15 +1,9 @@
-import assert from 'assert';
 import sinon from 'sinon';
 
 import Hls from '../../../src/hls';
 import Event from '../../../src/events';
-import { FragmentTracker, FragmentState } from '../../../src/controller/fragment-tracker';
-import { SubtitleStreamController, SubtitleStreamControllerState } from '../../../src/controller/subtitle-stream-controller';
-import M3U8Parser from '../../../src/loader/m3u8-parser';
-import { mockFragments } from '../../mocks/data';
-import Fragment from '../../../src/loader/fragment';
-
-const State = SubtitleStreamControllerState;
+import { FragmentTracker } from '../../../src/controller/fragment-tracker';
+import { SubtitleStreamController } from '../../../src/controller/subtitle-stream-controller';
 
 const mediaMock = {
   currentTime: 0
@@ -25,7 +19,7 @@ describe('SubtitleStreamController', function () {
   let fragmentTracker;
   let streamController;
 
-  beforeEach(() => {
+  beforeEach(function () {
     hls = new Hls({});
     fragmentTracker = new FragmentTracker(hls);
     streamController = new SubtitleStreamController(hls, fragmentTracker);
@@ -33,24 +27,24 @@ describe('SubtitleStreamController', function () {
     streamController.onMediaAttached(mediaMock);
   });
 
-  afterEach(() => {
+  afterEach(function () {
     streamController.onMediaDetaching(mediaMock);
   });
 
-  describe('onSubtitleTracksUpdate', () => {
-    beforeEach(() => {
+  describe('onSubtitleTracksUpdate', function () {
+    beforeEach(function () {
       hls.trigger(Event.SUBTITLE_TRACKS_UPDATED, {
         subtitleTracks: tracksMock
       });
     });
 
-    it('should update tracks list', () => {
-      assert(streamController.tracks === tracksMock);
+    it('should update tracks list', function () {
+      expect(streamController.tracks).to.equal(tracksMock);
     });
   });
 
-  describe('onSubtitleTrackSwitch', () => {
-    beforeEach(() => {
+  describe('onSubtitleTrackSwitch', function () {
+    beforeEach(function () {
       streamController.tracks = tracksMock;
       streamController.clearInterval = sinon.spy();
       streamController.setInterval = sinon.spy();
@@ -60,30 +54,30 @@ describe('SubtitleStreamController', function () {
       });
     });
 
-    it('should call setInterval if details available', () => {
-      assert(streamController.setInterval.calledOnce);
+    it('should call setInterval if details available', function () {
+      expect(streamController.setInterval).to.have.been.calledOnce;
     });
 
-    it('should call clearInterval if no tracks present', () => {
+    it('should call clearInterval if no tracks present', function () {
       streamController.tracks = null;
       hls.trigger(Event.SUBTITLE_TRACK_SWITCH, {
         id: 0
       });
-      assert(streamController.clearInterval.calledOnce);
+      expect(streamController.clearInterval).to.have.been.calledOnce;
     });
 
-    it('should call clearInterval if new track id === -1', () => {
+    it('should call clearInterval if new track id === -1', function () {
       hls.trigger(Event.SUBTITLE_TRACK_SWITCH, {
         id: -1
       });
-      assert(streamController.clearInterval.calledOnce);
+      expect(streamController.clearInterval).to.have.been.calledOnce;
     });
   });
 
-  describe('onSubtitleTrackLoaded', () => {
+  describe('onSubtitleTrackLoaded', function () {
     let detailsMock = {};
 
-    beforeEach(() => {
+    beforeEach(function () {
       streamController.setInterval = sinon.spy();
       streamController.tracks = tracksMock;
       hls.trigger(Event.SUBTITLE_TRACK_LOADED, {
@@ -91,22 +85,22 @@ describe('SubtitleStreamController', function () {
       });
     });
 
-    it('should add details to track object in list', () => {
-      assert(streamController.tracks[1].details === detailsMock);
+    it('should add details to track object in list', function () {
+      expect(streamController.tracks[1].details).to.equal(detailsMock);
     });
 
-    it('should call setInterval', () => {
-      assert(streamController.setInterval.calledOnce);
+    it('should call setInterval', function () {
+      expect(streamController.setInterval).to.have.been.calledOnce;
     });
 
-    it('should not crash when no tracks present', () => {
+    it('should not crash when no tracks present', function () {
       streamController.tracks = null;
       hls.trigger(Event.SUBTITLE_TRACK_LOADED, {
         id: 0, details: {}
       });
     });
 
-    it('should not crash when no track id does not exist', () => {
+    it('should not crash when no track id does not exist', function () {
       streamController.tracks = null;
       hls.trigger(Event.SUBTITLE_TRACK_LOADED, {
         id: 5, details: {}
diff --git a/tests/unit/controller/subtitle-track-controller.js b/tests/unit/controller/subtitle-track-controller.js
index 254c0930c19..eb6d3033609 100644
--- a/tests/unit/controller/subtitle-track-controller.js
+++ b/tests/unit/controller/subtitle-track-controller.js
@@ -1,15 +1,13 @@
-import sinon from 'sinon';
 import SubtitleTrackController from '../../../src/controller/subtitle-track-controller';
 import Hls from '../../../src/hls';
+import sinon from 'sinon';
 
-const assert = require('assert');
-
-describe('SubtitleTrackController', () => {
+describe('SubtitleTrackController', function () {
   let subtitleTrackController;
   let videoElement;
 
-  beforeEach(() => {
-    const hls = new Hls();
+  beforeEach(function () {
+    const hls = new Hls({});
 
     videoElement = document.createElement('video');
     subtitleTrackController = new SubtitleTrackController(hls);
@@ -24,86 +22,87 @@ describe('SubtitleTrackController', () => {
     textTrack2.mode = 'disabled';
   });
 
-  describe('onTextTrackChanged', () => {
-    it('should set subtitleTrack to -1 if disabled', () => {
-      assert.strictEqual(subtitleTrackController.subtitleTrack, -1);
+  describe('onTextTrackChanged', function () {
+    it('should set subtitleTrack to -1 if disabled', function () {
+      expect(subtitleTrackController.subtitleTrack).to.equal(-1);
 
       videoElement.textTracks[0].mode = 'disabled';
       subtitleTrackController._onTextTracksChanged();
 
-      assert.strictEqual(subtitleTrackController.subtitleTrack, -1);
+      expect(subtitleTrackController.subtitleTrack).to.equal(-1);
     });
 
-    it('should set subtitleTrack to 0 if hidden', () => {
-      assert.strictEqual(subtitleTrackController.subtitleTrack, -1);
+    it('should set subtitleTrack to 0 if hidden', function () {
+      expect(subtitleTrackController.subtitleTrack).to.equal(-1);
 
       videoElement.textTracks[0].mode = 'hidden';
       subtitleTrackController._onTextTracksChanged();
 
-      assert.strictEqual(subtitleTrackController.subtitleTrack, 0);
+      expect(subtitleTrackController.subtitleTrack).to.equal(0);
     });
 
-    it('should set subtitleTrack to 0 if showing', () => {
-      assert.strictEqual(subtitleTrackController.subtitleTrack, -1);
+    it('should set subtitleTrack to 0 if showing', function () {
+      expect(subtitleTrackController.subtitleTrack).to.equal(-1);
 
       videoElement.textTracks[0].mode = 'showing';
       subtitleTrackController._onTextTracksChanged();
 
-      assert.strictEqual(subtitleTrackController.subtitleTrack, 0);
+      expect(subtitleTrackController.subtitleTrack).to.equal(0);
     });
   });
 
-  describe('set subtitleTrack', () => {
-    it('should set active text track mode to showing', () => {
+  describe('set subtitleTrack', function () {
+    it('should set active text track mode to showing', function () {
       videoElement.textTracks[0].mode = 'disabled';
 
       subtitleTrackController.subtitleDisplay = true;
       subtitleTrackController.subtitleTrack = 0;
 
-      assert.strictEqual(videoElement.textTracks[0].mode, 'showing');
+      expect(videoElement.textTracks[0].mode).to.equal('showing');
     });
 
-    it('should set active text track mode to hidden', () => {
+    it('should set active text track mode to hidden', function () {
       videoElement.textTracks[0].mode = 'disabled';
-
       subtitleTrackController.subtitleDisplay = false;
       subtitleTrackController.subtitleTrack = 0;
 
-      assert.strictEqual(videoElement.textTracks[0].mode, 'hidden');
+      expect(videoElement.textTracks[0].mode).to.equal('hidden');
     });
 
-    it('should disable previous track', () => {
+    it('should disable previous track', function () {
       // Change active track without triggering setSubtitleTrackInternal
       subtitleTrackController.trackId = 0;
-
       // Change active track and trigger setSubtitleTrackInternal
       subtitleTrackController.subtitleTrack = 1;
 
-      assert.strictEqual(videoElement.textTracks[0].mode, 'disabled');
+      expect(videoElement.textTracks[0].mode).to.equal('disabled');
     });
 
     it('should trigger SUBTITLE_TRACK_SWITCH', function () {
       const triggerSpy = sinon.spy(subtitleTrackController.hls, 'trigger');
       subtitleTrackController.trackId = 0;
       subtitleTrackController.subtitleTrack = 1;
-      assert.equal(triggerSpy.callCount, 2);
-      assert.equal(triggerSpy.firstCall.calledWith('hlsSubtitleTrackSwitch', { id: 1 }), true);
+
+      expect(triggerSpy).to.have.been.calledTwice;
+      expect(triggerSpy.firstCall).to.have.been.calledWith('hlsSubtitleTrackSwitch', { id: 1 });
     });
 
     it('should trigger SUBTITLE_TRACK_LOADING if the track has no details', function () {
       const triggerSpy = sinon.spy(subtitleTrackController.hls, 'trigger');
       subtitleTrackController.trackId = 0;
       subtitleTrackController.subtitleTrack = 1;
-      assert.equal(triggerSpy.callCount, 2);
-      assert.equal(triggerSpy.secondCall.calledWith('hlsSubtitleTrackLoading', { url: 'bar', id: 1 }), true);
+
+      expect(triggerSpy).to.have.been.calledTwice;
+      expect(triggerSpy.secondCall).to.have.been.calledWith('hlsSubtitleTrackLoading', { url: 'bar', id: 1 });
     });
 
     it('should not trigger SUBTITLE_TRACK_LOADING if the track has details and is not live', function () {
       const triggerSpy = sinon.spy(subtitleTrackController.hls, 'trigger');
       subtitleTrackController.trackId = 1;
       subtitleTrackController.subtitleTrack = 0;
-      assert.equal(triggerSpy.callCount, 1);
-      assert.equal(triggerSpy.firstCall.calledWith('hlsSubtitleTrackSwitch', { id: 0 }), true);
+
+      expect(triggerSpy).to.have.been.calledOnce;
+      expect(triggerSpy.firstCall).to.have.been.calledWith('hlsSubtitleTrackSwitch', { id: 0 });
     });
 
     it('should trigger SUBTITLE_TRACK_SWITCH if passed -1', function () {
@@ -111,23 +110,26 @@ describe('SubtitleTrackController', () => {
       const triggerSpy = sinon.spy(subtitleTrackController.hls, 'trigger');
       subtitleTrackController.trackId = 0;
       subtitleTrackController.subtitleTrack = -1;
-      assert.equal(stopTimerSpy.callCount, 1);
-      assert.equal(triggerSpy.firstCall.calledWith('hlsSubtitleTrackSwitch', { id: -1 }), true);
+
+      expect(stopTimerSpy).to.have.been.calledOnce;
+      expect(triggerSpy.firstCall).to.have.been.calledWith('hlsSubtitleTrackSwitch', { id: -1 });
     });
 
     it('should trigger SUBTITLE_TRACK_LOADING if the track is live, even if it has details', function () {
       const triggerSpy = sinon.spy(subtitleTrackController.hls, 'trigger');
       subtitleTrackController.trackId = 0;
       subtitleTrackController.subtitleTrack = 2;
-      assert.equal(triggerSpy.callCount, 2);
-      assert.equal(triggerSpy.secondCall.calledWith('hlsSubtitleTrackLoading', { url: 'foo', id: 2 }), true);
+
+      expect(triggerSpy).to.have.been.calledTwice;
+      expect(triggerSpy.secondCall).to.have.been.calledWith('hlsSubtitleTrackLoading', { url: 'foo', id: 2 });
     });
 
     it('should do nothing if called with out of bound indicies', function () {
       const stopTimerSpy = sinon.spy(subtitleTrackController, '_stopTimer');
       subtitleTrackController.subtitleTrack = 5;
       subtitleTrackController.subtitleTrack = -2;
-      assert.equal(stopTimerSpy.callCount, 0);
+
+      expect(stopTimerSpy).to.have.not.been.called;
     });
 
     it('should do nothing if called with a non-number', function () {
@@ -148,7 +150,7 @@ describe('SubtitleTrackController', () => {
         });
         subtitleTrackController._toggleTrackModes(-1);
         [].slice.call(videoElement.textTracks).forEach(t => {
-          assert.equal(t.mode, 'disabled');
+          expect(t.mode).to.equal('disabled');
         });
       });
 
diff --git a/tests/unit/controller/timeline-controller.js b/tests/unit/controller/timeline-controller.js
index 947cdbae4a0..08e98a43b81 100644
--- a/tests/unit/controller/timeline-controller.js
+++ b/tests/unit/controller/timeline-controller.js
@@ -1,43 +1,41 @@
 import TimelineController from '../../../src/controller/timeline-controller';
 import Hls from '../../../src/hls';
 
-const assert = require('assert');
-
-describe('TimelineController', () => {
+describe('TimelineController', function () {
   let timelineController;
   let hls;
 
-  beforeEach(() => {
+  beforeEach(function () {
     hls = new Hls();
     hls.config.enableWebVTT = true;
     timelineController = new TimelineController(hls);
     timelineController.media = document.createElement('video');
   });
 
-  it('should set default track to showing when displaySubtitles is true', () => {
+  it('should set default track to showing when displaySubtitles is true', function () {
     hls.subtitleTrackController = { subtitleDisplay: true };
 
     timelineController.onManifestLoaded({
       subtitles: [{ id: 0 }, { id: 1, default: true }]
     });
 
-    assert.strictEqual(timelineController.textTracks[0].mode, 'disabled');
-    assert.strictEqual(timelineController.textTracks[1].mode, 'showing');
+    expect(timelineController.textTracks[0].mode).to.equal('disabled');
+    expect(timelineController.textTracks[1].mode).to.equal('showing');
   });
 
-  it('should set default track to hidden when displaySubtitles is false', () => {
+  it('should set default track to hidden when displaySubtitles is false', function () {
     hls.subtitleTrackController = { subtitleDisplay: false };
 
     timelineController.onManifestLoaded({
       subtitles: [{ id: 0 }, { id: 1, default: true }]
     });
 
-    assert.strictEqual(timelineController.textTracks[0].mode, 'disabled');
-    assert.strictEqual(timelineController.textTracks[1].mode, 'hidden');
+    expect(timelineController.textTracks[0].mode).to.equal('disabled');
+    expect(timelineController.textTracks[1].mode).to.equal('hidden');
   });
 
-  describe('reuse text track', () => {
-    it('should reuse text track when track order is same between manifests', () => {
+  describe('reuse text track', function () {
+    it('should reuse text track when track order is same between manifests', function () {
       hls.subtitleTrackController = { subtitleDisplay: false };
 
       timelineController.onManifestLoaded({
@@ -45,29 +43,29 @@ describe('TimelineController', () => {
       });
 
       // text tracks model contain only newly added manifest tracks, in same order as in manifest
-      assert.strictEqual(timelineController.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.textTracks.length, 2);
+      expect(timelineController.textTracks[0].label).to.equal('en');
+      expect(timelineController.textTracks[1].label).to.equal('ru');
+      expect(timelineController.textTracks.length).to.equal(2);
       // text tracks of the media contain the newly added text tracks
-      assert.strictEqual(timelineController.media.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.media.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.media.textTracks.length, 2);
+      expect(timelineController.media.textTracks[0].label).to.equal('en');
+      expect(timelineController.media.textTracks[1].label).to.equal('ru');
+      expect(timelineController.media.textTracks.length).to.equal(2);
 
       timelineController.onManifestLoaded({
         subtitles: [{ id: 0, name: 'en' }, { id: 1, name: 'ru' }]
       });
 
       // text tracks model contain only newly added manifest tracks, in same order
-      assert.strictEqual(timelineController.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.textTracks.length, 2);
+      expect(timelineController.textTracks[0].label).to.equal('en');
+      expect(timelineController.textTracks[1].label).to.equal('ru');
+      expect(timelineController.textTracks.length).to.equal(2);
       // text tracks of the media contain the previously added text tracks, in same order as the manifest order
-      assert.strictEqual(timelineController.media.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.media.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.media.textTracks.length, 2);
+      expect(timelineController.media.textTracks[0].label).to.equal('en');
+      expect(timelineController.media.textTracks[1].label).to.equal('ru');
+      expect(timelineController.media.textTracks.length).to.equal(2);
     });
 
-    it('should reuse text track when track order is not same between manifests', () => {
+    it('should reuse text track when track order is not same between manifests', function () {
       hls.subtitleTrackController = { subtitleDisplay: false };
 
       timelineController.onManifestLoaded({
@@ -75,26 +73,26 @@ describe('TimelineController', () => {
       });
 
       // text tracks model contain only newly added manifest tracks, in same order as in manifest
-      assert.strictEqual(timelineController.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.textTracks.length, 2);
+      expect(timelineController.textTracks[0].label).to.equal('en');
+      expect(timelineController.textTracks[1].label).to.equal('ru');
+      expect(timelineController.textTracks.length).to.equal(2);
       // text tracks of the media contain the newly added text tracks
-      assert.strictEqual(timelineController.media.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.media.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.media.textTracks.length, 2);
+      expect(timelineController.media.textTracks[0].label).to.equal('en');
+      expect(timelineController.media.textTracks[1].label).to.equal('ru');
+      expect(timelineController.media.textTracks.length).to.equal(2);
 
       timelineController.onManifestLoaded({
         subtitles: [{ id: 0, name: 'ru' }, { id: 1, name: 'en' }]
       });
 
       // text tracks model contain only newly added manifest tracks, in same order
-      assert.strictEqual(timelineController.textTracks[0].label, 'ru');
-      assert.strictEqual(timelineController.textTracks[1].label, 'en');
-      assert.strictEqual(timelineController.textTracks.length, 2);
-      // text tracks of the media contain the previously added text tracks, in opposite order to the manifest order
-      assert.strictEqual(timelineController.media.textTracks[0].label, 'en');
-      assert.strictEqual(timelineController.media.textTracks[1].label, 'ru');
-      assert.strictEqual(timelineController.media.textTracks.length, 2);
+      expect(timelineController.textTracks[0].label).to.equal('ru');
+      expect(timelineController.textTracks[1].label).to.equal('en');
+      expect(timelineController.textTracks.length).to.equal(2);
+      // text tracks of the media contain the previously added text tracks).to.equal(in opposite order to the manifest order
+      expect(timelineController.media.textTracks[0].label).to.equal('en');
+      expect(timelineController.media.textTracks[1].label).to.equal('ru');
+      expect(timelineController.media.textTracks.length).to.equal(2);
     });
   });
 });
diff --git a/tests/unit/crypt/aes-decryptor.js b/tests/unit/crypt/aes-decryptor.js
index 63988ec767d..0c07af4a983 100644
--- a/tests/unit/crypt/aes-decryptor.js
+++ b/tests/unit/crypt/aes-decryptor.js
@@ -1,27 +1,26 @@
 import { removePadding } from '../../../src/crypt/aes-decryptor';
-const assert = require('assert');
 
-describe('AESDecryptor', () => {
-  describe('removePadding()', () => {
+describe('AESDecryptor', function () {
+  describe('removePadding()', function () {
     // this should never happen with a valid stream
-    it('is a no-op when the last byte is 0', () => {
+    it('is a no-op when the last byte is 0', function () {
       const arr = new Uint8Array([1, 2, 3, 0]);
-      assert.strictEqual(removePadding(arr.buffer), arr.buffer);
+      expect(removePadding(arr.buffer)).to.equal(arr.buffer);
     });
 
-    it('removes 1 byte when the last byte is 1', () => {
+    it('removes 1 byte when the last byte is 1', function () {
       const arr = new Uint8Array([1, 2, 3, 1]);
-      assert.deepEqual(Array.from(new Uint8Array(removePadding(arr.buffer))), [1, 2, 3]);
+      expect(Array.from(new Uint8Array(removePadding(arr.buffer)))).to.deep.equal([1, 2, 3]);
     });
 
-    it('removes 3 bytes when the last byte is 3', () => {
+    it('removes 3 bytes when the last byte is 3', function () {
       const arr = new Uint8Array([1, 2, 3, 3]);
-      assert.deepEqual(Array.from(new Uint8Array(removePadding(arr.buffer))), [1]);
+      expect(Array.from(new Uint8Array(removePadding(arr.buffer)))).to.deep.equal([1]);
     });
 
-    it('removes 4 bytes when the last byte is 4', () => {
+    it('removes 4 bytes when the last byte is 4', function () {
       const arr = new Uint8Array([1, 2, 3, 4]);
-      assert.deepEqual(Array.from(new Uint8Array(removePadding(arr.buffer))), []);
+      expect(Array.from(new Uint8Array(removePadding(arr.buffer)))).to.deep.equal([]);
     });
   });
 });
diff --git a/tests/unit/demuxer/adts.js b/tests/unit/demuxer/adts.js
index 636cd1aa6d8..f72ffb8f4eb 100644
--- a/tests/unit/demuxer/adts.js
+++ b/tests/unit/demuxer/adts.js
@@ -4,11 +4,10 @@ import {
 } from '../../../src/demux/adts';
 import { ErrorTypes } from '../../../src/errors';
 
-const assert = require('assert');
 const sinon = require('sinon');
 
-describe('getAudioConfig', () => {
-  it('should trigger a MEDIA_ERROR event if sample index is invalid', () => {
+describe('getAudioConfig', function () {
+  it('should trigger a MEDIA_ERROR event if sample index is invalid', function () {
     const observer = {
       trigger: sinon.spy()
     };
@@ -17,12 +16,12 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x34; // sampling_frequency_index = 14, which is a reserved value
 
-    assert.equal(getAudioConfig(observer, data, 0, 'mp4a.40.29'), undefined);
-    assert.ok(observer.trigger.calledOnce);
-    assert.equal(observer.trigger.args[0][1].type, ErrorTypes.MEDIA_ERROR);
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.29')).to.not.exist;
+    expect(observer.trigger).to.have.been.calledOnce;
+    expect(observer.trigger.args[0][1].type).to.equal(ErrorTypes.MEDIA_ERROR);
   });
 
-  it('should return audio config for firefox if the specified sampling frequency > 24kHz', () => {
+  it('should return audio config for firefox if the specified sampling frequency > 24kHz', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'firefox')
     };
@@ -31,7 +30,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x00; // sampling_frequency_index = 0
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.29')).to.deep.equal({
       config: [16, 0],
       samplerate: 96000,
       channelCount: 0,
@@ -40,7 +39,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config with a different extension sampling index for Firefox if sampling freq is low', () => {
+  it('should return audio config with a different extension sampling index for Firefox if sampling freq is low', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Firefox')
     };
@@ -49,7 +48,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x28; // sampling_frequency_index = 10
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.29')).to.deep.equal({
       config: [45, 3, 136, 0],
       samplerate: 11025,
       channelCount: 0,
@@ -58,7 +57,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Android', () => {
+  it('should return audio config for Android', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Android')
     };
@@ -67,7 +66,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x28; // sampling_frequency_index = 10
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.29')).to.deep.equal({
       config: [21, 0],
       samplerate: 11025,
       channelCount: 0,
@@ -76,7 +75,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Chrome', () => {
+  it('should return audio config for Chrome', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
     };
@@ -85,7 +84,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x28; // sampling_frequency_index = 10
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.29'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.29')).to.deep.equal({
       config: [45, 3, 136, 0],
       samplerate: 11025,
       channelCount: 0,
@@ -94,7 +93,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Chrome if there is no audio codec', () => {
+  it('should return audio config for Chrome if there is no audio codec', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
     };
@@ -103,7 +102,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x28; // sampling_frequency_index = 10
 
-    assert.deepEqual(getAudioConfig(observer, data, 0), {
+    expect(getAudioConfig(observer, data, 0)).to.deep.equal({
       config: [45, 3, 136, 0],
       samplerate: 11025,
       channelCount: 0,
@@ -112,7 +111,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Chrome if there is no audio codec and freq is high enough', () => {
+  it('should return audio config for Chrome if there is no audio codec and freq is high enough', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
     };
@@ -121,7 +120,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x08; // sampling_frequency_index = 2
 
-    assert.deepEqual(getAudioConfig(observer, data, 0), {
+    expect(getAudioConfig(observer, data, 0)).to.deep.equal({
       config: [41, 1, 8, 0],
       samplerate: 64000,
       channelCount: 0,
@@ -130,7 +129,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Chrome if audio codec is "mp4a.40.5"', () => {
+  it('should return audio config for Chrome if audio codec is "mp4a.40.5"', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
     };
@@ -139,7 +138,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x28; // sampling_frequency_index = 10
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.5'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.5')).to.deep.equal({
       config: [45, 3, 136, 0],
       samplerate: 11025,
       channelCount: 0,
@@ -148,7 +147,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Chrome if audio codec is "mp4a.40.2"', () => {
+  it('should return audio config for Chrome if audio codec is "mp4a.40.2"', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Chrome')
     };
@@ -158,7 +157,7 @@ describe('getAudioConfig', () => {
     data[2] = 0x28; // sampling_frequency_index = 10
     data[3] = 0x40; // channel = 1
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.2'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.2')).to.deep.equal({
       config: [21, 8],
       samplerate: 11025,
       channelCount: 1,
@@ -167,7 +166,7 @@ describe('getAudioConfig', () => {
     });
   });
 
-  it('should return audio config for Vivaldi', () => {
+  it('should return audio config for Vivaldi', function () {
     const observer = {
       trigger: sinon.stub(navigator, 'userAgent').get(() => 'Vivaldi')
     };
@@ -176,7 +175,7 @@ describe('getAudioConfig', () => {
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[2] = 0x08; // sampling_frequency_index = 2
 
-    assert.deepEqual(getAudioConfig(observer, data, 0, 'mp4a.40.2'), {
+    expect(getAudioConfig(observer, data, 0, 'mp4a.40.2')).to.deep.equal({
       config: [17, 0],
       samplerate: 64000,
       channelCount: 0,
@@ -186,44 +185,44 @@ describe('getAudioConfig', () => {
   });
 });
 
-describe('isHeaderPattern', () => {
-  it('should return true if the specified data slot is of header pattern', () => {
+describe('isHeaderPattern', function () {
+  it('should return true if the specified data slot is of header pattern', function () {
     const data = new Uint8Array(new ArrayBuffer(16));
     data[0] = 0xff;
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
     data[14] = 0xff;
     data[15] = 0xf9; // ID = 1 (MPEG-2), layer = 00, protection_absent = 1
-    assert.ok(isHeaderPattern(data, 0));
-    assert.ok(isHeaderPattern(data, 14));
+    expect(isHeaderPattern(data, 0)).to.be.true;
+    expect(isHeaderPattern(data, 14)).to.be.true;
   });
 
-  it('should return false if the specific data is not of header pattern', () => {
+  it('should return false if the specific data is not of header pattern', function () {
     const data = new Uint8Array(new ArrayBuffer(4));
     data[1] = 0xff;
     data[2] = 0xff;
-    assert.equal(isHeaderPattern(data, 0), false);
-    assert.equal(isHeaderPattern(data, 2), false);
+    expect(isHeaderPattern(data, 0)).to.be.false;
+    expect(isHeaderPattern(data, 2)).to.be.false;
   });
 });
 
-describe('getHeaderLength', () => {
-  it('should return 7 if there is no CRC', () => {
+describe('getHeaderLength', function () {
+  it('should return 7 if there is no CRC', function () {
     const data = new Uint8Array(new ArrayBuffer(2));
     data[0] = 0xff;
     data[1] = 0xf9; // ID = 1 (MPEG-2), layer = 00, protection_absent = 1
-    assert.equal(getHeaderLength(data, 0), 7);
+    expect(getHeaderLength(data, 0)).to.equal(7);
   });
 
-  it('should return 9 if there is CRC', () => {
+  it('should return 9 if there is CRC', function () {
     const data = new Uint8Array(new ArrayBuffer(2));
     data[0] = 0xff;
     data[1] = 0xf0; // ID = 0 (MPEG-4), layer = 00, protection_absent = 0
-    assert.equal(getHeaderLength(data, 0), 9);
+    expect(getHeaderLength(data, 0)).to.equal(9);
   });
 });
 
-describe('getFullFrameLength', () => {
-  it('should extract frame_length field and return its value', () => {
+describe('getFullFrameLength', function () {
+  it('should extract frame_length field and return its value', function () {
     const data = new Uint8Array(new ArrayBuffer(8));
     data[0] = 0xff;
     data[1] = 0xf9;
@@ -231,44 +230,44 @@ describe('getFullFrameLength', () => {
     data[3] = 0x02; // the last 2 bits belong to frame_length
     data[4] = 0x00; // all 8 bits belong to frame_length
     data[5] = 0xE0; // the first 3 bits belong to frame_length
-    assert.equal(getFullFrameLength(data, 0), 4103);
+    expect(getFullFrameLength(data, 0)).to.equal(4103);
   });
 });
 
-describe('isHeader', () => {
-  it('should return true if there are enough data and it is of header pattern', () => {
+describe('isHeader', function () {
+  it('should return true if there are enough data and it is of header pattern', function () {
     const data = new Uint8Array(new ArrayBuffer(8));
     data[0] = 0xff;
     data[1] = 0xf9;
-    assert.ok(isHeader(data, 0));
+    expect(isHeader(data, 0)).to.be.true;
   });
 
-  it('should return false if there are not enough data', () => {
+  it('should return false if there are not enough data', function () {
     const data = new Uint8Array(new ArrayBuffer(1));
-    assert.equal(isHeader(data, 0), false);
+    expect(isHeader(data, 0)).to.be.false;
   });
 
-  it('should return false if it is not of header pattern', () => {
+  it('should return false if it is not of header pattern', function () {
     const data = new Uint8Array(new ArrayBuffer(8));
-    assert.equal(isHeader(data, 0), false);
+    expect(isHeader(data, 0)).to.be.false;
   });
 });
 
-describe('probe', () => {
-  it('should return false if `isHeader` fails', () => {
+describe('probe', function () {
+  it('should return false if `isHeader` fails', function () {
     const data = new Uint8Array(new ArrayBuffer(8));
-    assert.equal(probe(data, 0), false);
+    expect(probe(data, 0)).to.be.false;
   });
 
-  it('should return true if it contains the entire ADTS frame', () => {
+  it('should return true if it contains the entire ADTS frame', function () {
     const data = new Uint8Array(new ArrayBuffer(16));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
-    assert.ok(probe(data, 0));
+    expect(probe(data, 0)).to.be.true;
   });
 
-  it('should return true if it contains an valid following frame header', () => {
+  it('should return true if it contains an valid following frame header', function () {
     const data = new Uint8Array(new ArrayBuffer(18));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
@@ -276,46 +275,46 @@ describe('probe', () => {
     data[16] = 0xff;
     data[17] = 0xf0;
     console.log('hahah');
-    assert.ok(probe(data, 0));
+    expect(probe(data, 0)).to.be.true;
   });
 
-  it('should return false if it contains the entire ADTS frame with an incomplete following header', () => {
+  it('should return false if it contains the entire ADTS frame with an incomplete following header', function () {
     const data = new Uint8Array(new ArrayBuffer(17));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
-    assert.equal(probe(data, 0), false);
+    expect(probe(data, 0)).to.be.false;
   });
 
-  it('should return false if it contains the entire ADTS frame with an invalid following frame header', () => {
+  it('should return false if it contains the entire ADTS frame with an invalid following frame header', function () {
     const data = new Uint8Array(new ArrayBuffer(18));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
-    assert.equal(probe(data, 0), false);
+    expect(probe(data, 0)).to.be.false;
   });
 
-  it('should return false if it does not contain the entire header', () => {
+  it('should return false if it does not contain the entire header', function () {
     const data = new Uint8Array(new ArrayBuffer(2));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
-    assert.equal(probe(data, 0), false);
+    expect(probe(data, 0)).to.be.false;
   });
 });
 
-describe('initTrackConfig', () => {
-  it('should do nothing with track if track.samplerate is defined', () => {
+describe('initTrackConfig', function () {
+  it('should do nothing with track if track.samplerate is defined', function () {
     const track = {
       samplerate: 64000
     };
     initTrackConfig(track);
 
-    assert.deepEqual(track, {
+    expect(track).to.deep.equal({
       samplerate: 64000
     });
   });
 
-  it('should call `getAudioConfig` and change track if track.samplerate is undefined', () => {
+  it('should call `getAudioConfig` and change track if track.samplerate is undefined', function () {
     const track = {};
     const observer = {
       trigger: sinon.spy()
@@ -327,7 +326,7 @@ describe('initTrackConfig', () => {
 
     initTrackConfig(track, observer, data, 0, 'mp4a.40.29');
 
-    assert.deepEqual(track, {
+    expect(track).to.deep.equal({
       config: [45, 3, 136, 0],
       samplerate: 11025,
       channelCount: 0,
@@ -337,45 +336,45 @@ describe('initTrackConfig', () => {
   });
 });
 
-describe('getFrameDuration', () => {
-  it('should compute frame duration from sample rate', () => {
-    assert.equal(getFrameDuration(64000), 1440);
+describe('getFrameDuration', function () {
+  it('should compute frame duration from sample rate', function () {
+    expect(getFrameDuration(64000)).to.equal(1440);
   });
 });
 
-describe('parseFrameHeader', () => {
-  it('should return parsed result if data contains the entire frame', () => {
+describe('parseFrameHeader', function () {
+  it('should return parsed result if data contains the entire frame', function () {
     const data = new Uint8Array(new ArrayBuffer(16));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
-    assert.deepEqual(parseFrameHeader(data, 0, 0, 0, 0), {
+    expect(parseFrameHeader(data, 0, 0, 0, 0)).to.deep.equal({
       headerLength: 9,
       frameLength: 7,
       stamp: 0
     });
   });
 
-  it('should return undefined if there is only the header part', () => {
+  it('should return undefined if there is only the header part', function () {
     const data = new Uint8Array(new ArrayBuffer(9));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x01;
     data[5] = 0x40; // frame_length is 9
-    assert.equal(parseFrameHeader(data, 0, 0, 0, 0), undefined);
+    expect(parseFrameHeader(data, 0, 0, 0, 0)).to.be.undefined;
   });
 
-  it('should return undefined if data does not contain the entire frame', () => {
+  it('should return undefined if data does not contain the entire frame', function () {
     const data = new Uint8Array(new ArrayBuffer(12));
     data[0] = 0xff;
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
-    assert.equal(parseFrameHeader(data, 0, 0, 0, 0), undefined);
+    expect(parseFrameHeader(data, 0, 0, 0, 0)).to.be.undefined;
   });
 });
 
-describe('appendFrame', () => {
-  it('should append the found sample to track and return some useful information', () => {
+describe('appendFrame', function () {
+  it('should append the found sample to track and return some useful information', function () {
     const track = {
       samplerate: 64000,
       samples: [],
@@ -386,7 +385,7 @@ describe('appendFrame', () => {
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
 
-    assert.deepEqual(appendFrame(track, data, 0, 0, 0), {
+    expect(appendFrame(track, data, 0, 0, 0)).to.deep.equal({
       sample: {
         unit: data.subarray(9, 16),
         pts: 0,
@@ -394,11 +393,11 @@ describe('appendFrame', () => {
       },
       length: 16
     });
-    assert.equal(track.samples.length, 1);
-    assert.equal(track.len, 7);
+    expect(track.samples.length).to.equal(1);
+    expect(track.len).to.equal(7);
   });
 
-  it('should not append sample if `parseFrameHeader` fails', () => {
+  it('should not append sample if `parseFrameHeader` fails', function () {
     const track = {
       samplerate: 64000,
       samples: [],
@@ -409,8 +408,8 @@ describe('appendFrame', () => {
     data[1] = 0xf0; // protection_absent = 0
     data[4] = 0x02; // frame_length is 16
 
-    assert.equal(appendFrame(track, data, 0, 0, 0), undefined);
-    assert.equal(track.samples.length, 0);
-    assert.equal(track.len, 0);
+    expect(appendFrame(track, data, 0, 0, 0)).to.be.undefined;
+    expect(track.samples.length).to.equal(0);
+    expect(track.len).to.equal(0);
   });
 });
diff --git a/tests/unit/demuxer/demuxer.js b/tests/unit/demuxer/demuxer.js
index 5529dbe2001..0a5a348cb3c 100644
--- a/tests/unit/demuxer/demuxer.js
+++ b/tests/unit/demuxer/demuxer.js
@@ -1,7 +1,6 @@
 import Event from '../../../src/events.js';
 import Demuxer from '../../../src/demux/demuxer.js';
 
-const assert = require('assert');
 const sinon = require('sinon');
 
 describe('Demuxer tests', function () {
@@ -14,12 +13,11 @@ describe('Demuxer tests', function () {
     let id = 'main';
     let demux = new Demuxer(hls, id);
 
-    assert.equal(demux.hls, hls, 'Hls object created');
-    assert.equal(demux.id, id, 'Id has been set up');
-
-    assert.ok(demux.observer.trigger, 'Observer trigger set up');
-    assert.ok(demux.observer.off, 'Observer off set up');
-    assert.ok(demux.demuxer, 'Demuxer set up');
+    expect(demux.hls).to.equal(hls, 'Hls object created');
+    expect(demux.id).to.equal(id, 'Id has been set up');
+    expect(demux.observer.trigger).to.exist;
+    expect(demux.observer.off).to.exist;
+    expect(demux.demuxer).to.exist;
   });
 
   it('Demuxer constructor with worker', function () {
@@ -31,12 +29,12 @@ describe('Demuxer tests', function () {
     let id = 'main';
     let demux = new Demuxer(hls, id);
 
-    assert.equal(demux.hls, hls, 'Hls object created');
-    assert.equal(demux.id, id, 'Id has been set up');
+    expect(demux.hls).to.equal(hls, 'Hls object created');
+    expect(demux.id).to.equal(id, 'Id has been set up');
 
-    assert.ok(demux.observer.trigger, 'Observer trigger set up');
-    assert.ok(demux.observer.off, 'Observer off set up');
-    assert.ok(demux.w, 'Worker set up');
+    expect(demux.observer.trigger).to.exist;
+    expect(demux.observer.off).to.exist;
+    expect(demux.w).to.exist;
   });
 
   it('Destroy demuxer worker', function () {
@@ -49,9 +47,9 @@ describe('Demuxer tests', function () {
     let demux = new Demuxer(hls, id);
     demux.destroy();
 
-    assert.equal(demux.observer, null, 'Observer destroyed');
-    assert.equal(demux.demuxer, null, 'Demuxer destroyed');
-    assert.equal(demux.w, null, 'Worker destroyed');
+    expect(demux.observer).to.not.exist;
+    expect(demux.demuxer).to.not.exist;
+    expect(demux.w).to.not.exist;
   });
 
   it('Destroy demuxer no worker', function () {
@@ -64,9 +62,9 @@ describe('Demuxer tests', function () {
     let demux = new Demuxer(hls, id);
     demux.destroy();
 
-    assert.equal(demux.observer, null, 'Observer destroyed');
-    assert.equal(demux.demuxer, null, 'Demuxer destroyed');
-    assert.equal(demux.w, null, 'Worker destroyed');
+    expect(demux.observer).to.not.exist;
+    expect(demux.demuxer).to.not.exist;
+    expect(demux.w).to.not.exist;
   });
 
   it('Push data to demuxer with worker', function () {
@@ -101,24 +99,24 @@ describe('Demuxer tests', function () {
       defaultInitPTS = {};
 
     let stub = sinon.stub(demux.w, 'postMessage').callsFake(function (obj1, obj2) {
-      assert.equal(obj1.cmd, 'demux', 'cmd');
-      assert.equal(obj1.data, data, 'data');
-      assert.equal(obj1.decryptdata, newFrag.decryptdata, 'decryptdata');
-      assert.equal(obj1.initSegment, initSegment, 'initSegment');
-      assert.equal(obj1.audioCodec, audioCodec, 'audioCodec');
-      assert.equal(obj1.videoCodec, videoCodec, 'videoCodec');
-      assert.equal(obj1.timeOffset, newFrag.startPTS, 'timeOffset');
-      assert.equal(obj1.discontinuity, false, 'discontinuity');
-      assert.equal(obj1.trackSwitch, false, 'trackSwitch');
-      assert.equal(obj1.contiguous, true, 'contiguous');
-      assert.equal(obj1.duration, duration, 'duration');
-      assert.equal(obj1.defaultInitPTS, defaultInitPTS, 'defaultInitPTS');
-      assert.equal(obj2[0], data, 'ArrayBuffer');
+      expect(obj1.cmd).to.equal('demux', 'cmd');
+      expect(obj1.data).to.equal(data, 'data');
+      expect(obj1.decryptdata).to.equal(newFrag.decryptdata, 'decryptdata');
+      expect(obj1.initSegment).to.equal(initSegment, 'initSegment');
+      expect(obj1.audioCodec).to.equal(audioCodec, 'audioCodec');
+      expect(obj1.videoCodec).to.equal(videoCodec, 'videoCodec');
+      expect(obj1.timeOffset).to.equal(newFrag.startPTS, 'timeOffset');
+      expect(obj1.discontinuity).to.be.false;
+      expect(obj1.trackSwitch).to.be.false;
+      expect(obj1.contiguous).to.be.true;
+      expect(obj1.duration).to.equal(duration, 'duration');
+      expect(obj1.defaultInitPTS).to.equal(defaultInitPTS, 'defaultInitPTS');
+      expect(obj2[0]).to.equal(data, 'ArrayBuffer');
     });
 
     demux.push(data, initSegment, audioCodec, videoCodec, newFrag, duration, accurateTimeOffset, defaultInitPTS);
 
-    assert.ok(stub.calledOnce, 'postMessage called once');
+    expect(stub).to.have.been.calledOnce;
   });
 
   it('Push data to demuxer with no worker', function () {
@@ -152,24 +150,23 @@ describe('Demuxer tests', function () {
       accurateTimeOffset = {},
       defaultInitPTS = {};
 
-    let stub = sinon.stub(demux.demuxer, 'push').callsFake(function (obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11, obj12, obj13) {
-      assert.equal(obj1, data);
-      assert.equal(obj2, newFrag.decryptdata);
-      assert.equal(obj3, initSegment);
-      assert.equal(obj4, audioCodec);
-      assert.equal(obj5, videoCodec);
-      assert.equal(obj6, newFrag.start);
-      assert.equal(obj7, true);
-      assert.equal(obj8, true);
-      assert.equal(obj9, false);
-      assert.equal(obj10, duration);
-      assert.equal(obj11, accurateTimeOffset);
-      assert.equal(obj12, defaultInitPTS);
+    let stub = sinon.stub(demux.demuxer, 'push').callsFake(function (obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8, obj9, obj10, obj11, obj12) {
+      expect(obj1).to.equal(data);
+      expect(obj2).to.equal(newFrag.decryptdata);
+      expect(obj3).to.equal(initSegment);
+      expect(obj4).to.equal(audioCodec);
+      expect(obj5).to.equal(videoCodec);
+      expect(obj6).to.equal(newFrag.start);
+      expect(obj7).to.be.true;
+      expect(obj8).to.be.true;
+      expect(obj9).to.be.false;
+      expect(obj10).to.equal(duration);
+      expect(obj11).to.equal(accurateTimeOffset);
+      expect(obj12).to.equal(defaultInitPTS);
     });
 
     demux.push(data, initSegment, audioCodec, videoCodec, newFrag, duration, accurateTimeOffset, defaultInitPTS);
-
-    assert.ok(stub.calledWith(data, newFrag.decryptdata, initSegment, audioCodec, videoCodec, newFrag.start, true, true, false, duration, accurateTimeOffset, defaultInitPTS));
+    expect(stub).to.have.been.calledWith(data, newFrag.decryptdata, initSegment, audioCodec, videoCodec, newFrag.start, true, true, false, duration, accurateTimeOffset, defaultInitPTS);
   });
 
   it('Sent worker generic message', function () {
@@ -190,10 +187,10 @@ describe('Demuxer tests', function () {
     };
 
     hls.trigger = function (event, data) {
-      assert.equal(event, evt.data.event);
-      assert.equal(data, evt.data.data);
-      assert.equal(demux.frag, evt.data.data.frag);
-      assert.equal(id, evt.data.data.id);
+      expect(event).to.equal(evt.data.event);
+      expect(data).to.equal(evt.data.data);
+      expect(demux.frag).to.equal(evt.data.data.frag);
+      expect(id).to.equal(evt.data.data.id);
     };
 
     demux.onWorkerMessage(evt);
@@ -219,7 +216,7 @@ describe('Demuxer tests', function () {
 
     demux.onWorkerMessage(evt);
 
-    assert.ok(spy.calledOnce);
+    expect(spy).to.have.been.calledOnce;
   });
 
   it('Sent worker message FRAG_PARSING_DATA', function () {
@@ -242,7 +239,7 @@ describe('Demuxer tests', function () {
 
     demux.onWorkerMessage(evt);
 
-    assert.ok(evt.data.data.data1);
-    assert.ok(evt.data.data.data2);
+    expect(evt.data.data.data1).to.exist;
+    expect(evt.data.data.data2).to.exist;
   });
 });
diff --git a/tests/unit/dummy.js b/tests/unit/dummy.js
deleted file mode 100644
index 78604f96599..00000000000
--- a/tests/unit/dummy.js
+++ /dev/null
@@ -1,8 +0,0 @@
-let assert = require('assert');
-describe('dummy test', function () {
-  describe('#1', function () {
-    it('always passing', function () {
-      assert.equal(true, true);
-    });
-  });
-});
diff --git a/tests/unit/events.js b/tests/unit/events.js
index 4d1a19eb6e5..f2d56fad0f7 100644
--- a/tests/unit/events.js
+++ b/tests/unit/events.js
@@ -1,5 +1,4 @@
 import Events from '../../src/events';
-let assert = require('assert');
 
 function getAllCapsSnakeCaseToCamelCase (eventType) {
   let eventValue = '';
@@ -27,7 +26,7 @@ describe('Events tests', function () {
       it('should have a value matching generics convention for event type: ' + event, function () {
         let value = Events[event];
         let expected = 'hls' + getAllCapsSnakeCaseToCamelCase(event);
-        assert.equal(value, expected);
+        expect(value).to.equal(expected);
       });
     });
   });
diff --git a/tests/unit/hls.js b/tests/unit/hls.js
index d55c890bb2e..4d3756d31ef 100644
--- a/tests/unit/hls.js
+++ b/tests/unit/hls.js
@@ -1,7 +1,5 @@
 import Hls from '../../src/hls';
 
-const assert = require('assert');
-
 describe('Hls', function () {
   it('should return a bandwidth estimate if the estimator exists', function () {
     const MOCKED_ESTIMATE = 2000;
@@ -11,11 +9,11 @@ describe('Hls', function () {
         getEstimate: () => MOCKED_ESTIMATE
       }
     };
-    assert.strictEqual(hls.bandwidthEstimate, MOCKED_ESTIMATE);
+    expect(hls.bandwidthEstimate).to.equal(MOCKED_ESTIMATE);
   });
 
   it('should return NaN if the estimator does not exist', function () {
     const hls = new Hls();
-    assert.strictEqual(isNaN(hls.bandwidthEstimate), true);
+    expect(hls.bandwidthEstimate).to.be.NaN;
   });
 });
diff --git a/tests/unit/loader/fragment.js b/tests/unit/loader/fragment.js
index 6c45e814de8..c172c264f76 100644
--- a/tests/unit/loader/fragment.js
+++ b/tests/unit/loader/fragment.js
@@ -1,4 +1,3 @@
-const assert = require('assert');
 import Fragment from '../../../src/loader/fragment';
 
 describe('Fragment class tests', function () {
@@ -11,25 +10,25 @@ describe('Fragment class tests', function () {
     it('computes endPdt when pdt and duration are valid', function () {
       frag.programDateTime = 1000;
       frag.duration = 1;
-      assert.strictEqual(frag.endProgramDateTime, 2000);
+      expect(frag.endProgramDateTime).to.equal(2000);
     });
 
     it('considers 0 a valid pdt', function () {
       frag.programDateTime = 0;
       frag.duration = 1;
-      assert.strictEqual(frag.endProgramDateTime, 1000);
+      expect(frag.endProgramDateTime).to.equal(1000);
     });
 
     it('returns null if pdt is NaN', function () {
       frag.programDateTime = 'foo';
       frag.duration = 1;
-      assert.strictEqual(frag.endProgramDateTime, null);
+      expect(frag.endProgramDateTime).to.equal(null);
     });
 
     it('defaults duration to 0 if duration is NaN', function () {
       frag.programDateTime = 1000;
       frag.duration = 'foo';
-      assert.strictEqual(frag.endProgramDateTime, 1000);
+      expect(frag.endProgramDateTime).to.equal(1000);
     });
   });
 });
diff --git a/tests/unit/loader/level.js b/tests/unit/loader/level.js
index c74f8ae80ee..6d1c73cc85f 100644
--- a/tests/unit/loader/level.js
+++ b/tests/unit/loader/level.js
@@ -1,21 +1,20 @@
-const assert = require('assert');
 import Level from '../../../src/loader/level';
 
 describe('Level Class tests', function () {
   it('sets programDateTime to true when the first fragment has valid pdt', function () {
     const level = new Level();
     level.fragments = [{ programDateTime: 1 }];
-    assert.strictEqual(level.hasProgramDateTime, true);
+    expect(level.hasProgramDateTime).to.be.true;
   });
 
   it('sets programDateTime to false when no fragments is empty', function () {
     const level = new Level();
-    assert.strictEqual(level.hasProgramDateTime, false);
+    expect(level.hasProgramDateTime).to.be.false;
   });
 
   it('sets programDateTime to false when the first fragment has an invalid pdt', function () {
     const level = new Level();
     level.fragments = [{ programDateTime: 'foo' }];
-    assert.strictEqual(level.hasProgramDateTime, false);
+    expect(level.hasProgramDateTime).to.be.false;
   });
 });
diff --git a/tests/unit/loader/playlist-loader.js b/tests/unit/loader/playlist-loader.js
index 5645b8647b4..e1e1df98daf 100644
--- a/tests/unit/loader/playlist-loader.js
+++ b/tests/unit/loader/playlist-loader.js
@@ -1,97 +1,94 @@
 import PlaylistLoader from '../../../src/loader/playlist-loader';
 import M3U8Parser from '../../../src/loader/m3u8-parser';
 
-const assert = require('assert');
-const bufferIsEqual = require('arraybuffer-equal');
-
-describe('PlaylistLoader', () => {
-  it('parses empty manifest returns empty array', () => {
-    assert.deepEqual(M3U8Parser.parseMasterPlaylist('', 'http://www.dailymotion.com'), []);
+describe('PlaylistLoader', function () {
+  it('parses empty manifest returns empty array', function () {
+    expect(M3U8Parser.parseMasterPlaylist('', 'http://www.dailymotion.com')).to.deep.equal([]);
   });
 
-  it('manifest with broken syntax returns empty array', () => {
+  it('manifest with broken syntax returns empty array', function () {
     let manifest = `#EXTXSTREAMINF:PROGRAM-ID=1,BANDWIDTH=836280,CODECS="mp4a.40.2,avc1.64001f",RESOLUTION=848x360,NAME="480"
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core`;
-    assert.deepEqual(M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com'), []);
+    expect(M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com')).to.deep.equal([]);
   });
 
-  it('parses manifest with one level', () => {
+  it('parses manifest with one level', function () {
     let manifest = `#EXTM3U
 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=836280,CODECS="mp4a.40.2,avc1.64001f",RESOLUTION=848x360,NAME="480"
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core`;
 
     let result = M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com');
-    assert.strictEqual(result.length, 1);
-    assert.strictEqual(result[0]['bitrate'], 836280);
-    assert.strictEqual(result[0]['audioCodec'], 'mp4a.40.2');
-    assert.strictEqual(result[0]['videoCodec'], 'avc1.64001f');
-    assert.strictEqual(result[0]['width'], 848);
-    assert.strictEqual(result[0]['height'], 360);
-    assert.strictEqual(result[0]['name'], '480');
-    assert.strictEqual(result[0]['url'], 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
+    expect(result).to.have.lengthOf(1);
+    expect(result[0]['bitrate']).to.equal(836280);
+    expect(result[0]['audioCodec']).to.equal('mp4a.40.2');
+    expect(result[0]['videoCodec']).to.equal('avc1.64001f');
+    expect(result[0]['width']).to.equal(848);
+    expect(result[0]['height']).to.equal(360);
+    expect(result[0]['name']).to.equal('480');
+    expect(result[0]['url']).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
   });
 
-  it('parses manifest without codecs', () => {
+  it('parses manifest without codecs', function () {
     let manifest = `#EXTM3U
 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=836280,RESOLUTION=848x360,NAME="480"
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core`;
 
     let result = M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com');
-    assert.strictEqual(result.length, 1);
-    assert.strictEqual(result[0]['bitrate'], 836280);
-    assert.strictEqual(result[0]['audioCodec'], undefined);
-    assert.strictEqual(result[0]['videoCodec'], undefined);
-    assert.strictEqual(result[0]['width'], 848);
-    assert.strictEqual(result[0]['height'], 360);
-    assert.strictEqual(result[0]['name'], '480');
-    assert.strictEqual(result[0]['url'], 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
+    expect(result.length, 1);
+    expect(result[0]['bitrate']).to.equal(836280);
+    expect(result[0]['audioCodec']).to.not.exist;
+    expect(result[0]['videoCodec']).to.not.exist;
+    expect(result[0]['width']).to.equal(848);
+    expect(result[0]['height']).to.equal(360);
+    expect(result[0]['name']).to.equal('480');
+    expect(result[0]['url']).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
   });
 
-  it('does not care about the attribute order', () => {
+  it('does not care about the attribute order', function () {
     let manifest = `#EXTM3U
 #EXT-X-STREAM-INF:NAME="480",PROGRAM-ID=1,BANDWIDTH=836280,CODECS="mp4a.40.2,avc1.64001f",RESOLUTION=848x360
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core`;
 
     let result = M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com');
-    assert.strictEqual(result.length, 1);
-    assert.strictEqual(result[0]['bitrate'], 836280);
-    assert.strictEqual(result[0]['audioCodec'], 'mp4a.40.2');
-    assert.strictEqual(result[0]['videoCodec'], 'avc1.64001f');
-    assert.strictEqual(result[0]['width'], 848);
-    assert.strictEqual(result[0]['height'], 360);
-    assert.strictEqual(result[0]['name'], '480');
-    assert.strictEqual(result[0]['url'], 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
+    expect(result.length, 1);
+    expect(result[0]['bitrate'], 836280);
+    expect(result[0]['audioCodec'], 'mp4a.40.2');
+    expect(result[0]['videoCodec'], 'avc1.64001f');
+    expect(result[0]['width'], 848);
+    expect(result[0]['height'], 360);
+    expect(result[0]['name'], '480');
+    expect(result[0]['url'], 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
 
     manifest = `#EXTM3U
 #EXT-X-STREAM-INF:NAME="480",RESOLUTION=848x360,PROGRAM-ID=1,BANDWIDTH=836280,CODECS="mp4a.40.2,avc1.64001f"
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core`;
 
     result = M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com');
-    assert.strictEqual(result.length, 1);
-    assert.strictEqual(result[0]['bitrate'], 836280);
-    assert.strictEqual(result[0]['audioCodec'], 'mp4a.40.2');
-    assert.strictEqual(result[0]['videoCodec'], 'avc1.64001f');
-    assert.strictEqual(result[0]['width'], 848);
-    assert.strictEqual(result[0]['height'], 360);
-    assert.strictEqual(result[0]['name'], '480');
-    assert.strictEqual(result[0]['url'], 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
+    expect(result.length, 1);
+    expect(result[0]['bitrate']).to.equal(836280);
+    expect(result[0]['audioCodec']).to.equal('mp4a.40.2');
+    expect(result[0]['videoCodec']).to.equal('avc1.64001f');
+    expect(result[0]['width']).to.equal(848);
+    expect(result[0]['height']).to.equal(360);
+    expect(result[0]['name']).to.equal('480');
+    expect(result[0]['url']).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
 
     manifest = `#EXTM3U
 #EXT-X-STREAM-INF:CODECS="mp4a.40.2,avc1.64001f",NAME="480",RESOLUTION=848x360,PROGRAM-ID=1,BANDWIDTH=836280
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core`;
 
     result = M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com');
-    assert.strictEqual(result.length, 1);
-    assert.strictEqual(result[0]['bitrate'], 836280);
-    assert.strictEqual(result[0]['audioCodec'], 'mp4a.40.2');
-    assert.strictEqual(result[0]['videoCodec'], 'avc1.64001f');
-    assert.strictEqual(result[0]['width'], 848);
-    assert.strictEqual(result[0]['height'], 360);
-    assert.strictEqual(result[0]['name'], '480');
-    assert.strictEqual(result[0]['url'], 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
+    expect(result).to.have.lengthOf(1);
+    expect(result[0]['bitrate']).to.equal(836280);
+    expect(result[0]['audioCodec']).to.equal('mp4a.40.2');
+    expect(result[0]['videoCodec']).to.equal('avc1.64001f');
+    expect(result[0]['width']).to.equal(848);
+    expect(result[0]['height']).to.equal(360);
+    expect(result[0]['name']).to.equal('480');
+    expect(result[0]['url']).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core');
   });
 
-  it('parses manifest with 10 levels', () => {
+  it('parses manifest with 10 levels', function () {
     let manifest = `#EXTM3U
 #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=836280,CODECS="mp4a.40.2,avc1.64001f",RESOLUTION=848x360,NAME="480"
 http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core
@@ -115,37 +112,37 @@ http://proxy-62.dailymotion.com/sec(2a991e17f08fcd94f95637a6dd718ddd)/video/107/
 http://proxy-21.dailymotion.com/sec(2a991e17f08fcd94f95637a6dd718ddd)/video/107/282/158282701_mp4_h264_aac_fhd.m3u8#cell=core`;
 
     let result = M3U8Parser.parseMasterPlaylist(manifest, 'http://www.dailymotion.com');
-    assert.strictEqual(result.length, 10);
-    assert.strictEqual(result[0]['bitrate'], 836280);
-    assert.strictEqual(result[1]['bitrate'], 836280);
-    assert.strictEqual(result[2]['bitrate'], 246440);
-    assert.strictEqual(result[3]['bitrate'], 246440);
-    assert.strictEqual(result[4]['bitrate'], 460560);
-    assert.strictEqual(result[5]['bitrate'], 460560);
-    assert.strictEqual(result[6]['bitrate'], 2149280);
-    assert.strictEqual(result[7]['bitrate'], 2149280);
-    assert.strictEqual(result[8]['bitrate'], 6221600);
-    assert.strictEqual(result[9]['bitrate'], 6221600);
+    expect(result.length, 10);
+    expect(result[0]['bitrate']).to.equal(836280);
+    expect(result[1]['bitrate']).to.equal(836280);
+    expect(result[2]['bitrate']).to.equal(246440);
+    expect(result[3]['bitrate']).to.equal(246440);
+    expect(result[4]['bitrate']).to.equal(460560);
+    expect(result[5]['bitrate']).to.equal(460560);
+    expect(result[6]['bitrate']).to.equal(2149280);
+    expect(result[7]['bitrate']).to.equal(2149280);
+    expect(result[8]['bitrate']).to.equal(6221600);
+    expect(result[9]['bitrate']).to.equal(6221600);
   });
 
-  it('parses empty levels returns empty fragment array', () => {
+  it('parses empty levels returns empty fragment array', function () {
     let level = '';
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.fragments.length, 0);
-    assert.strictEqual(result.totalduration, 0);
+    expect(result.fragments).to.have.lengthOf(0);
+    expect(result.totalduration).to.equal(0);
   });
 
-  it('level with 0 frag returns empty fragment array', () => {
+  it('level with 0 frag returns empty fragment array', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-PLAYLIST-TYPE:VOD
 #EXT-X-TARGETDURATION:14`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.fragments.length, 0);
-    assert.strictEqual(result.totalduration, 0);
+    expect(result.fragments).to.have.lengthOf(0);
+    expect(result.totalduration).to.equal(0);
   });
 
-  it('parse level with several fragments', () => {
+  it('parse level with several fragments', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-PLAYLIST-TYPE:VOD
@@ -163,27 +160,27 @@ http://proxy-21.dailymotion.com/sec(2a991e17f08fcd94f95637a6dd718ddd)/video/107/
 /sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/158282701_mp4_h264_aac_hq.ts
 #EXT-X-ENDLIST`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.totalduration, 51.24);
-    assert.strictEqual(result.startSN, 0);
-    assert.strictEqual(result.version, 3);
-    assert.strictEqual(result.type, 'VOD');
-    assert.strictEqual(result.targetduration, 14);
-    assert.strictEqual(result.live, false);
-    assert.strictEqual(result.fragments.length, 5);
-    assert.strictEqual(result.fragments[0].cc, 0);
-    assert.strictEqual(result.fragments[0].duration, 11.36);
-    assert.strictEqual(result.fragments[1].duration, 11.32);
-    assert.strictEqual(result.fragments[2].duration, 13.48);
-    assert.strictEqual(result.fragments[4].sn, 4);
-    assert.strictEqual(result.fragments[0].level, 0);
-    assert.strictEqual(result.fragments[4].cc, 0);
-    assert.strictEqual(result.fragments[4].sn, 4);
-    assert.strictEqual(result.fragments[4].start, 47.36);
-    assert.strictEqual(result.fragments[4].duration, 3.88);
-    assert.strictEqual(result.fragments[4].url, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/158282701_mp4_h264_aac_hq.ts');
+    expect(result.totalduration).to.equal(51.24);
+    expect(result.startSN).to.equal(0);
+    expect(result.version).to.equal(3);
+    expect(result.type).to.equal('VOD');
+    expect(result.targetduration).to.equal(14);
+    expect(result.live).to.be.false;
+    expect(result.fragments).to.have.lengthOf(5);
+    expect(result.fragments[0].cc).to.equal(0);
+    expect(result.fragments[0].duration).to.equal(11.36);
+    expect(result.fragments[1].duration).to.equal(11.32);
+    expect(result.fragments[2].duration).to.equal(13.48);
+    expect(result.fragments[4].sn).to.equal(4);
+    expect(result.fragments[0].level).to.equal(0);
+    expect(result.fragments[4].cc).to.equal(0);
+    expect(result.fragments[4].sn).to.equal(4);
+    expect(result.fragments[4].start).to.equal(47.36);
+    expect(result.fragments[4].duration).to.equal(3.88);
+    expect(result.fragments[4].url).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/158282701_mp4_h264_aac_hq.ts');
   });
 
-  it('parse level with single char fragment URI', () => {
+  it('parse level with single char fragment URI', function () {
     let level = `#EXTM3U
 #EXT-X-ALLOW-CACHE:NO
 #EXT-X-TARGETDURATION:2
@@ -193,22 +190,22 @@ http://proxy-21.dailymotion.com/sec(2a991e17f08fcd94f95637a6dd718ddd)/video/107/
 1
 #EXT-X-ENDLIST`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.totalduration, 4);
-    assert.strictEqual(result.startSN, 0);
-    assert.strictEqual(result.targetduration, 2);
-    assert.strictEqual(result.live, false);
-    assert.strictEqual(result.fragments.length, 2);
-    assert.strictEqual(result.fragments[0].cc, 0);
-    assert.strictEqual(result.fragments[0].duration, 2);
-    assert.strictEqual(result.fragments[0].sn, 0);
-    assert.strictEqual(result.fragments[0].relurl, '0');
-    assert.strictEqual(result.fragments[1].cc, 0);
-    assert.strictEqual(result.fragments[1].duration, 2);
-    assert.strictEqual(result.fragments[1].sn, 1);
-    assert.strictEqual(result.fragments[1].relurl, '1');
+    expect(result.totalduration).to.equal(4);
+    expect(result.startSN).to.equal(0);
+    expect(result.targetduration).to.equal(2);
+    expect(result.live).to.be.false;
+    expect(result.fragments).to.have.lengthOf(2);
+    expect(result.fragments[0].cc).to.equal(0);
+    expect(result.fragments[0].duration).to.equal(2);
+    expect(result.fragments[0].sn).to.equal(0);
+    expect(result.fragments[0].relurl).to.equal('0');
+    expect(result.fragments[1].cc).to.equal(0);
+    expect(result.fragments[1].duration).to.equal(2);
+    expect(result.fragments[1].sn).to.equal(1);
+    expect(result.fragments[1].relurl).to.equal('1');
   });
 
-  it('parse level with EXTINF line without comma', () => {
+  it('parse level with EXTINF line without comma', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-MEDIA-SEQUENCE:0
@@ -227,24 +224,24 @@ chop/segment-5.ts
 #EXTINF:6.000000
 #EXT-X-ENDLIST`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.totalduration, 30);
-    assert.strictEqual(result.startSN, 0);
-    assert.strictEqual(result.version, 3);
-    assert.strictEqual(result.targetduration, 6);
-    assert.strictEqual(result.live, false);
-    assert.strictEqual(result.fragments.length, 5);
-    assert.strictEqual(result.fragments[0].cc, 0);
-    assert.strictEqual(result.fragments[0].duration, 6);
-    assert.strictEqual(result.fragments[4].sn, 4);
-    assert.strictEqual(result.fragments[0].level, 0);
-    assert.strictEqual(result.fragments[4].cc, 0);
-    assert.strictEqual(result.fragments[4].sn, 4);
-    assert.strictEqual(result.fragments[4].start, 24);
-    assert.strictEqual(result.fragments[4].duration, 6);
-    assert.strictEqual(result.fragments[4].url, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/chop/segment-5.ts');
+    expect(result.totalduration).to.equal(30);
+    expect(result.startSN).to.equal(0);
+    expect(result.version).to.equal(3);
+    expect(result.targetduration).to.equal(6);
+    expect(result.live).to.be.false;
+    expect(result.fragments).to.have.lengthOf(5);
+    expect(result.fragments[0].cc).to.equal(0);
+    expect(result.fragments[0].duration).to.equal(6);
+    expect(result.fragments[4].sn).to.equal(4);
+    expect(result.fragments[0].level).to.equal(0);
+    expect(result.fragments[4].cc).to.equal(0);
+    expect(result.fragments[4].sn).to.equal(4);
+    expect(result.fragments[4].start).to.equal(24);
+    expect(result.fragments[4].duration).to.equal(6);
+    expect(result.fragments[4].url).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/chop/segment-5.ts');
   });
 
-  it('parse level with start time offset', () => {
+  it('parse level with start time offset', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-PLAYLIST-TYPE:VOD
@@ -262,14 +259,14 @@ chop/segment-5.ts
 /sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(5)/video/107/282/158282701_mp4_h264_aac_hq.ts
 #EXT-X-ENDLIST`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.totalduration, 51.24);
-    assert.strictEqual(result.startSN, 0);
-    assert.strictEqual(result.targetduration, 14);
-    assert.strictEqual(result.live, false);
-    assert.strictEqual(result.startTimeOffset, 10.3);
+    expect(result.totalduration).to.equal(51.24);
+    expect(result.startSN).to.equal(0);
+    expect(result.targetduration).to.equal(14);
+    expect(result.live).to.be.false;
+    expect(result.startTimeOffset).to.equal(10.3);
   });
 
-  it('parse AES encrypted URLs, with implicit IV', () => {
+  it('parse AES encrypted URLs, with implicit IV', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:1
 ## Created with Unified Streaming Platform(version=1.6.7)
@@ -285,25 +282,25 @@ oceans_aes-audio=65000-video=236000-2.ts
 oceans_aes-audio=65000-video=236000-3.ts
 #EXT-X-ENDLIST`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://foo.com/adaptive/oceans_aes/oceans_aes.m3u8', 0);
-    assert.strictEqual(result.totalduration, 25);
-    assert.strictEqual(result.startSN, 1);
-    assert.strictEqual(result.targetduration, 11);
-    assert.strictEqual(result.live, false);
-    assert.strictEqual(result.fragments.length, 3);
-    assert.strictEqual(result.fragments[0].cc, 0);
-    assert.strictEqual(result.fragments[0].duration, 11);
-    assert.strictEqual(result.fragments[0].title, 'no desc');
-    assert.strictEqual(result.fragments[0].level, 0);
-    assert.strictEqual(result.fragments[0].url, 'http://foo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=236000-1.ts');
-    assert.strictEqual(result.fragments[0].decryptdata.uri, 'http://foo.com/adaptive/oceans_aes/oceans.key');
-    assert.strictEqual(result.fragments[0].decryptdata.method, 'AES-128');
+    expect(result.totalduration).to.equal(25);
+    expect(result.startSN).to.equal(1);
+    expect(result.targetduration).to.equal(11);
+    expect(result.live).to.be.false;
+    expect(result.fragments).to.have.lengthOf(3);
+    expect(result.fragments[0].cc).to.equal(0);
+    expect(result.fragments[0].duration).to.equal(11);
+    expect(result.fragments[0].title).to.equal('no desc');
+    expect(result.fragments[0].level).to.equal(0);
+    expect(result.fragments[0].url).to.equal('http://foo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=236000-1.ts');
+    expect(result.fragments[0].decryptdata.uri).to.equal('http://foo.com/adaptive/oceans_aes/oceans.key');
+    expect(result.fragments[0].decryptdata.method).to.equal('AES-128');
     let sn = 1;
     let uint8View = new Uint8Array(16);
     for (let i = 12; i < 16; i++) {
       uint8View[i] = (sn >> 8 * (15 - i)) & 0xff;
     }
 
-    assert(bufferIsEqual(result.fragments[0].decryptdata.iv.buffer, uint8View.buffer));
+    expect(result.fragments[0].decryptdata.iv.buffer).to.deep.equal(uint8View.buffer);
 
     sn = 3;
     uint8View = new Uint8Array(16);
@@ -311,10 +308,10 @@ oceans_aes-audio=65000-video=236000-3.ts
       uint8View[i] = (sn >> 8 * (15 - i)) & 0xff;
     }
 
-    assert(bufferIsEqual(result.fragments[2].decryptdata.iv.buffer, uint8View.buffer));
+    expect(result.fragments[2].decryptdata.iv.buffer).to.deep.equal(uint8View.buffer);
   });
 
-  it('parse level with #EXT-X-BYTERANGE before #EXTINF', () => {
+  it('parse level with #EXT-X-BYTERANGE before #EXTINF', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:4
 #EXT-X-ALLOW-CACHE:YES
@@ -352,18 +349,18 @@ lo008ts
 lo008ts`;
 
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 10);
-    assert.strictEqual(result.fragments[0].url, 'http://dummy.com/lo007ts');
-    assert.strictEqual(result.fragments[0].byteRangeStartOffset, 803136);
-    assert.strictEqual(result.fragments[0].byteRangeEndOffset, 943196);
-    assert.strictEqual(result.fragments[1].byteRangeStartOffset, 943196);
-    assert.strictEqual(result.fragments[1].byteRangeEndOffset, 1039452);
-    assert.strictEqual(result.fragments[9].url, 'http://dummy.com/lo008ts');
-    assert.strictEqual(result.fragments[9].byteRangeStartOffset, 684508);
-    assert.strictEqual(result.fragments[9].byteRangeEndOffset, 817988);
+    expect(result.fragments.length, 10);
+    expect(result.fragments[0].url).to.equal('http://dummy.com/lo007ts');
+    expect(result.fragments[0].byteRangeStartOffset).to.equal(803136);
+    expect(result.fragments[0].byteRangeEndOffset).to.equal(943196);
+    expect(result.fragments[1].byteRangeStartOffset).to.equal(943196);
+    expect(result.fragments[1].byteRangeEndOffset).to.equal(1039452);
+    expect(result.fragments[9].url).to.equal('http://dummy.com/lo008ts');
+    expect(result.fragments[9].byteRangeStartOffset).to.equal(684508);
+    expect(result.fragments[9].byteRangeEndOffset).to.equal(817988);
   });
 
-  it('parse level with #EXT-X-BYTERANGE after #EXTINF', () => {
+  it('parse level with #EXT-X-BYTERANGE after #EXTINF', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:4
 #EXT-X-ALLOW-CACHE:YES
@@ -401,18 +398,18 @@ lo008ts
 lo008ts`;
 
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 10);
-    assert.strictEqual(result.fragments[0].url, 'http://dummy.com/lo007ts');
-    assert.strictEqual(result.fragments[0].byteRangeStartOffset, 803136);
-    assert.strictEqual(result.fragments[0].byteRangeEndOffset, 943196);
-    assert.strictEqual(result.fragments[1].byteRangeStartOffset, 943196);
-    assert.strictEqual(result.fragments[1].byteRangeEndOffset, 1039452);
-    assert.strictEqual(result.fragments[9].url, 'http://dummy.com/lo008ts');
-    assert.strictEqual(result.fragments[9].byteRangeStartOffset, 684508);
-    assert.strictEqual(result.fragments[9].byteRangeEndOffset, 817988);
+    expect(result.fragments).to.have.lengthOf(10);
+    expect(result.fragments[0].url).to.equal('http://dummy.com/lo007ts');
+    expect(result.fragments[0].byteRangeStartOffset).to.equal(803136);
+    expect(result.fragments[0].byteRangeEndOffset).to.equal(943196);
+    expect(result.fragments[1].byteRangeStartOffset).to.equal(943196);
+    expect(result.fragments[1].byteRangeEndOffset).to.equal(1039452);
+    expect(result.fragments[9].url).to.equal('http://dummy.com/lo008ts');
+    expect(result.fragments[9].byteRangeStartOffset).to.equal(684508);
+    expect(result.fragments[9].byteRangeEndOffset).to.equal(817988);
   });
 
-  it('parse level with #EXT-X-BYTERANGE without offset', () => {
+  it('parse level with #EXT-X-BYTERANGE without offset', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:4
 #EXT-X-ALLOW-CACHE:YES
@@ -429,17 +426,17 @@ lo007ts
 lo007ts`;
 
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 3);
-    assert.strictEqual(result.fragments[0].url, 'http://dummy.com/lo007ts');
-    assert.strictEqual(result.fragments[0].byteRangeStartOffset, 803136);
-    assert.strictEqual(result.fragments[0].byteRangeEndOffset, 943196);
-    assert.strictEqual(result.fragments[1].byteRangeStartOffset, 943196);
-    assert.strictEqual(result.fragments[1].byteRangeEndOffset, 1039452);
-    assert.strictEqual(result.fragments[2].byteRangeStartOffset, 1039452);
-    assert.strictEqual(result.fragments[2].byteRangeEndOffset, 1182520);
+    expect(result.fragments.length, 3);
+    expect(result.fragments[0].url).to.equal('http://dummy.com/lo007ts');
+    expect(result.fragments[0].byteRangeStartOffset).to.equal(803136);
+    expect(result.fragments[0].byteRangeEndOffset).to.equal(943196);
+    expect(result.fragments[1].byteRangeStartOffset).to.equal(943196);
+    expect(result.fragments[1].byteRangeEndOffset).to.equal(1039452);
+    expect(result.fragments[2].byteRangeStartOffset).to.equal(1039452);
+    expect(result.fragments[2].byteRangeEndOffset).to.equal(1182520);
   });
 
-  it('parses discontinuity and maintains continuity counter', () => {
+  it('parses discontinuity and maintains continuity counter', function () {
     let level = `#EXTM3U
 #EXTM3U
 #EXT-X-VERSION:3
@@ -459,13 +456,13 @@ lo007ts`;
 #EXT-X-ENDLIST
     `;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 5);
-    assert.strictEqual(result.totalduration, 45);
-    assert.strictEqual(result.fragments[2].cc, 0);
-    assert.strictEqual(result.fragments[3].cc, 1); // continuity counter should increase around discontinuity
+    expect(result.fragments).to.have.lengthOf(5);
+    expect(result.totalduration).to.equal(45);
+    expect(result.fragments[2].cc).to.equal(0);
+    expect(result.fragments[3].cc).to.equal(1); // continuity counter should increase around discontinuity
   });
 
-  it('parses correctly EXT-X-DISCONTINUITY-SEQUENCE and increases continuity counter', () => {
+  it('parses correctly EXT-X-DISCONTINUITY-SEQUENCE and increases continuity counter', function () {
     let level = `#EXTM3U
 #EXTM3U
 #EXT-X-VERSION:3
@@ -486,28 +483,28 @@ lo007ts`;
 #EXT-X-ENDLIST
     `;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 5);
-    assert.strictEqual(result.totalduration, 45);
-    assert.strictEqual(result.fragments[0].cc, 20);
-    assert.strictEqual(result.fragments[2].cc, 20);
-    assert.strictEqual(result.fragments[3].cc, 21); // continuity counter should increase around discontinuity
+    expect(result.fragments).to.have.lengthOf(5);
+    expect(result.totalduration).to.equal(45);
+    expect(result.fragments[0].cc).to.equal(20);
+    expect(result.fragments[2].cc).to.equal(20);
+    expect(result.fragments[3].cc).to.equal(21); // continuity counter should increase around discontinuity
   });
 
-  it('parses manifest with one audio track', () => {
+  it('parses manifest with one audio track', function () {
     let manifest = `#EXTM3U
 #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="600k",LANGUAGE="eng",NAME="Audio",AUTOSELECT=YES,DEFAULT=YES,URI="/videos/ZakEbrahim_2014/audio/600k.m3u8?qr=true&preroll=Blank",BANDWIDTH=614400`;
     let result = M3U8Parser.parseMasterPlaylistMedia(manifest, 'https://hls.ted.com/', 'AUDIO');
-    assert.strictEqual(result.length, 1);
-    assert.strictEqual(result[0]['autoselect'], true);
-    assert.strictEqual(result[0]['default'], true);
-    assert.strictEqual(result[0]['forced'], false);
-    assert.strictEqual(result[0]['groupId'], '600k');
-    assert.strictEqual(result[0]['lang'], 'eng');
-    assert.strictEqual(result[0]['name'], 'Audio');
-    assert.strictEqual(result[0]['url'], 'https://hls.ted.com/videos/ZakEbrahim_2014/audio/600k.m3u8?qr=true&preroll=Blank');
+    expect(result.length, 1);
+    expect(result[0]['autoselect']).to.be.true;
+    expect(result[0]['default']).to.be.true;
+    expect(result[0]['forced']).to.be.false;
+    expect(result[0]['groupId']).to.equal('600k');
+    expect(result[0]['lang']).to.equal('eng');
+    expect(result[0]['name']).to.equal('Audio');
+    expect(result[0]['url']).to.equal('https://hls.ted.com/videos/ZakEbrahim_2014/audio/600k.m3u8?qr=true&preroll=Blank');
   });
   // issue #425 - first fragment has null url and no decryptdata if EXT-X-KEY follows EXTINF
-  it('parse level with #EXT-X-KEY after #EXTINF', () => {
+  it('parse level with #EXT-X-KEY after #EXTINF', function () {
     let level = `#EXTM3U
 #EXT-X-TARGETDURATION:10
 #EXT-X-VERSION:3
@@ -531,25 +528,25 @@ lo007ts`;
 #EXTINF:10,
 0008.ts`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 8);
-    assert.strictEqual(result.totalduration, 80);
+    expect(result.fragments).to.have.lengthOf(8);
+    expect(result.totalduration).to.equal(80);
 
     let fragdecryptdata, decryptdata = result.fragments[0].decryptdata, sn = 0;
 
     result.fragments.forEach(function (fragment, idx) {
       sn = idx + 1;
 
-      assert.strictEqual(fragment.url, 'http://dummy.com/000' + sn + '.ts');
+      expect(fragment.url, 'http://dummy.com/000' + sn + '.ts');
 
       // decryptdata should persist across all fragments
       fragdecryptdata = fragment.decryptdata;
-      assert.strictEqual(fragdecryptdata.method, decryptdata.method);
-      assert.strictEqual(fragdecryptdata.uri, decryptdata.uri);
-      assert.strictEqual(fragdecryptdata.key, decryptdata.key);
+      expect(fragdecryptdata.method).to.equal(decryptdata.method);
+      expect(fragdecryptdata.uri).to.equal(decryptdata.uri);
+      expect(fragdecryptdata.key).to.equal(decryptdata.key);
 
       // initialization vector is correctly generated since it wasn't declared in the playlist
       let iv = fragdecryptdata.iv;
-      assert.strictEqual(iv[15], idx);
+      expect(iv[15]).to.equal(idx);
 
       // hold this decrypt data to compare to the next fragment's decrypt data
       decryptdata = fragment.decryptdata;
@@ -557,7 +554,7 @@ lo007ts`;
   });
 
   // PR #454 - Add support for custom tags in fragment object
-  it('return custom tags in fragment object', () => {
+  it('return custom tags in fragment object', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-TARGETDURATION:10
@@ -585,21 +582,21 @@ http://dummy.url.com/hls/live/segment/segment_022916_164500865_719934.ts
 #EXTINF:9.25,
 http://dummy.url.com/hls/live/segment/segment_022916_164500865_719935.ts`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.url.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 10);
-    assert.strictEqual(result.totalduration, 84.94);
-    assert.strictEqual(result.targetduration, 10);
-    assert.strictEqual(result.fragments[0].url, 'http://dummy.url.com/hls/live/segment/segment_022916_164500865_719926.ts');
-    assert.strictEqual(result.fragments[0].tagList.length, 1);
-    assert.strictEqual(result.fragments[2].tagList[0][0], 'EXT-X-CUE-OUT');
-    assert.strictEqual(result.fragments[2].tagList[0][1], 'DURATION=150,BREAKID=0x0');
-    assert.strictEqual(result.fragments[3].tagList[0][1], '0.50');
-    assert.strictEqual(result.fragments[4].tagList.length, 2);
-    assert.strictEqual(result.fragments[4].tagList[0][0], 'EXT-X-CUE-IN');
-    assert.strictEqual(result.fragments[7].tagList[0][0], 'INF');
-    assert.strictEqual(result.fragments[8].url, 'http://dummy.url.com/hls/live/segment/segment_022916_164500865_719934.ts');
+    expect(result.fragments).to.have.lengthOf(10);
+    expect(result.totalduration).to.equal(84.94);
+    expect(result.targetduration).to.equal(10);
+    expect(result.fragments[0].url).to.equal('http://dummy.url.com/hls/live/segment/segment_022916_164500865_719926.ts');
+    expect(result.fragments[0].tagList).to.have.lengthOf(1);
+    expect(result.fragments[2].tagList[0][0]).to.equal('EXT-X-CUE-OUT');
+    expect(result.fragments[2].tagList[0][1]).to.equal('DURATION=150,BREAKID=0x0');
+    expect(result.fragments[3].tagList[0][1]).to.equal('0.50');
+    expect(result.fragments[4].tagList).to.have.lengthOf(2);
+    expect(result.fragments[4].tagList[0][0]).to.equal('EXT-X-CUE-IN');
+    expect(result.fragments[7].tagList[0][0]).to.equal('INF');
+    expect(result.fragments[8].url).to.equal('http://dummy.url.com/hls/live/segment/segment_022916_164500865_719934.ts');
   });
 
-  it('parses playlists with #EXT-X-PROGRAM-DATE-TIME after #EXTINF before fragment URL', () => {
+  it('parses playlists with #EXT-X-PROGRAM-DATE-TIME after #EXTINF before fragment URL', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:2
 #EXT-X-TARGETDURATION:10
@@ -615,18 +612,18 @@ Rollover38803/20160525T064049-01-69844068.ts
 Rollover38803/20160525T064049-01-69844069.ts
     `;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 3);
-    assert.strictEqual(result.hasProgramDateTime, true);
-    assert.strictEqual(result.totalduration, 30);
-    assert.strictEqual(result.fragments[0].url, 'http://video.example.com/Rollover38803/20160525T064049-01-69844067.ts');
-    assert.strictEqual(result.fragments[0].programDateTime, 1464366884000);
-    assert.strictEqual(result.fragments[1].url, 'http://video.example.com/Rollover38803/20160525T064049-01-69844068.ts');
-    assert.strictEqual(result.fragments[1].programDateTime, 1464366894000);
-    assert.strictEqual(result.fragments[2].url, 'http://video.example.com/Rollover38803/20160525T064049-01-69844069.ts');
-    assert.strictEqual(result.fragments[2].programDateTime, 1464366904000);
+    expect(result.fragments).to.have.lengthOf(3);
+    expect(result.hasProgramDateTime).to.be.true;
+    expect(result.totalduration).to.equal(30);
+    expect(result.fragments[0].url).to.equal('http://video.example.com/Rollover38803/20160525T064049-01-69844067.ts');
+    expect(result.fragments[0].programDateTime).to.equal(1464366884000);
+    expect(result.fragments[1].url).to.equal('http://video.example.com/Rollover38803/20160525T064049-01-69844068.ts');
+    expect(result.fragments[1].programDateTime).to.equal(1464366894000);
+    expect(result.fragments[2].url).to.equal('http://video.example.com/Rollover38803/20160525T064049-01-69844069.ts');
+    expect(result.fragments[2].programDateTime).to.equal(1464366904000);
   });
 
-  it('parses #EXTINF without a leading digit', () => {
+  it('parses #EXTINF without a leading digit', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:3
 #EXT-X-PLAYLIST-TYPE:VOD
@@ -635,11 +632,11 @@ Rollover38803/20160525T064049-01-69844069.ts
 /sec(3ae40f708f79ca9471f52b86da76a3a8)/frag(1)/video/107/282/158282701_mp4_h264_aac_hq.ts
 #EXT-X-ENDLIST`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.fragments.length, 1);
-    assert.strictEqual(result.fragments[0].duration, 0.360);
+    expect(result.fragments).to.have.lengthOf(1);
+    expect(result.fragments[0].duration).to.equal(0.360);
   });
 
-  it('parses #EXT-X-MAP URI', () => {
+  it('parses #EXT-X-MAP URI', function () {
     let level = `#EXTM3U
 #EXT-X-TARGETDURATION:6
 #EXT-X-VERSION:7
@@ -651,14 +648,14 @@ Rollover38803/20160525T064049-01-69844069.ts
 #EXT-X-BYTERANGE:1543597@718
 main.mp4`;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/158282701_mp4_h264_aac_hq.m3u8#cell=core', 0);
-    assert.strictEqual(result.initSegment.url, 'http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/main.mp4');
-    assert.strictEqual(result.initSegment.byteRangeStartOffset, 0);
-    assert.strictEqual(result.initSegment.byteRangeEndOffset, 718);
-    assert.strictEqual(result.initSegment.sn, 'initSegment');
+    expect(result.initSegment.url).to.equal('http://proxy-62.dailymotion.com/sec(3ae40f708f79ca9471f52b86da76a3a8)/video/107/282/main.mp4');
+    expect(result.initSegment.byteRangeStartOffset).to.equal(0);
+    expect(result.initSegment.byteRangeEndOffset).to.equal(718);
+    expect(result.initSegment.sn).to.equal('initSegment');
   });
 
   describe('PDT calculations', function () {
-    it('if playlists contains #EXT-X-PROGRAM-DATE-TIME switching will be applied by PDT', () => {
+    it('if playlists contains #EXT-X-PROGRAM-DATE-TIME switching will be applied by PDT', function () {
       let level = `#EXTM3U
 #EXT-X-VERSION:2
 #EXT-X-TARGETDURATION:10
@@ -674,13 +671,13 @@ Rollover38803/20160525T064049-01-69844068.ts
 Rollover38803/20160525T064049-01-69844069.ts
     `;
       let result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-      assert.strictEqual(result.hasProgramDateTime, true);
-      assert.strictEqual(result.fragments[0].rawProgramDateTime, '2016-05-27T16:34:44Z');
-      assert.strictEqual(result.fragments[0].programDateTime, 1464366884000);
-      assert.strictEqual(result.fragments[1].rawProgramDateTime, '2016-05-27T16:34:54Z');
-      assert.strictEqual(result.fragments[1].programDateTime, 1464366894000);
-      assert.strictEqual(result.fragments[2].rawProgramDateTime, '2016-05-27T16:35:04Z');
-      assert.strictEqual(result.fragments[2].programDateTime, 1464366904000);
+      expect(result.hasProgramDateTime).to.be.true;
+      expect(result.fragments[0].rawProgramDateTime).to.equal('2016-05-27T16:34:44Z');
+      expect(result.fragments[0].programDateTime).to.equal(1464366884000);
+      expect(result.fragments[1].rawProgramDateTime).to.equal('2016-05-27T16:34:54Z');
+      expect(result.fragments[1].programDateTime).to.equal(1464366894000);
+      expect(result.fragments[2].rawProgramDateTime).to.equal('2016-05-27T16:35:04Z');
+      expect(result.fragments[2].programDateTime).to.equal(1464366904000);
     });
 
     it('backfills PDT values if the first segment does not start with PDT', function () {
@@ -695,10 +692,10 @@ frag2.ts
     `;
 
       const result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-      assert.strictEqual(result.hasProgramDateTime, true);
-      assert.strictEqual(result.fragments[2].rawProgramDateTime, '2016-05-27T16:35:04Z');
-      assert.strictEqual(result.fragments[1].programDateTime, 1464366894000);
-      assert.strictEqual(result.fragments[0].programDateTime, 1464366884000);
+      expect(result.hasProgramDateTime).to.be.true;
+      expect(result.fragments[2].rawProgramDateTime).to.equal('2016-05-27T16:35:04Z');
+      expect(result.fragments[1].programDateTime).to.equal(1464366894000);
+      expect(result.fragments[0].programDateTime).to.equal(1464366884000);
     });
 
     it('extrapolates PDT forward when subsequent fragments do not have a raw programDateTime', function () {
@@ -713,10 +710,10 @@ frag2.ts
     `;
 
       const result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-      assert.strictEqual(result.hasProgramDateTime, true);
-      assert.strictEqual(result.fragments[0].rawProgramDateTime, '2016-05-27T16:35:04Z');
-      assert.strictEqual(result.fragments[1].programDateTime, 1464366914000);
-      assert.strictEqual(result.fragments[2].programDateTime, 1464366924000);
+      expect(result.hasProgramDateTime).to.be.true;
+      expect(result.fragments[0].rawProgramDateTime).to.equal('2016-05-27T16:35:04Z');
+      expect(result.fragments[1].programDateTime).to.equal(1464366914000);
+      expect(result.fragments[2].programDateTime).to.equal(1464366924000);
     });
 
     it('recomputes PDT extrapolation whenever a new raw programDateTime is hit', function () {
@@ -743,16 +740,16 @@ frag5.ts
     `;
 
       const result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-      assert.strictEqual(result.hasProgramDateTime, true);
-      assert.strictEqual(result.fragments[0].programDateTime, 1464366904000);
-      assert.strictEqual(result.fragments[0].rawProgramDateTime, '2016-05-27T16:35:04Z');
-      assert.strictEqual(result.fragments[1].programDateTime, 1464366914000);
-      assert.strictEqual(result.fragments[2].programDateTime, 1495902904000);
-      assert.strictEqual(result.fragments[2].rawProgramDateTime, '2017-05-27T16:35:04Z');
-      assert.strictEqual(result.fragments[3].programDateTime, 1495902914000);
-      assert.strictEqual(result.fragments[4].programDateTime, 1432726923000);
-      assert.strictEqual(result.fragments[4].rawProgramDateTime, '2015-05-27T11:42:03Z');
-      assert.strictEqual(result.fragments[5].programDateTime, 1432726933000);
+      expect(result.hasProgramDateTime).to.be.true;
+      expect(result.fragments[0].programDateTime).to.equal(1464366904000);
+      expect(result.fragments[0].rawProgramDateTime).to.equal('2016-05-27T16:35:04Z');
+      expect(result.fragments[1].programDateTime).to.equal(1464366914000);
+      expect(result.fragments[2].programDateTime).to.equal(1495902904000);
+      expect(result.fragments[2].rawProgramDateTime).to.equal('2017-05-27T16:35:04Z');
+      expect(result.fragments[3].programDateTime).to.equal(1495902914000);
+      expect(result.fragments[4].programDateTime).to.equal(1432726923000);
+      expect(result.fragments[4].rawProgramDateTime).to.equal('2015-05-27T11:42:03Z');
+      expect(result.fragments[5].programDateTime).to.equal(1432726933000);
     });
 
     it('propagates the raw programDateTime to the fragment following the init segment', function () {
@@ -765,10 +762,10 @@ frag0.ts
 frag1.ts
     `;
       const result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-      assert.strictEqual(result.hasProgramDateTime, true);
-      assert.strictEqual(result.sn === 'initSegment', false);
-      assert.strictEqual(result.fragments[0].rawProgramDateTime, '2016-05-27T16:35:04Z');
-      assert.strictEqual(result.fragments[0].programDateTime, 1464366904000);
+      expect(result.hasProgramDateTime).to.be.true;
+      expect(result.sn === 'initSegment').to.be.false;
+      expect(result.fragments[0].rawProgramDateTime).to.equal('2016-05-27T16:35:04Z');
+      expect(result.fragments[0].programDateTime).to.equal(1464366904000);
     });
 
     it('ignores bad PDT values', function () {
@@ -780,13 +777,13 @@ frag0.ts
 frag1.ts
     `;
       const result = M3U8Parser.parseLevelPlaylist(level, 'http://video.example.com/disc.m3u8', 0);
-      assert.strictEqual(result.hasProgramDateTime, false);
-      assert.strictEqual(result.fragments[0].rawProgramDateTime, null);
-      assert.strictEqual(result.fragments[0].programDateTime, null);
+      expect(result.hasProgramDateTime).to.be.false;
+      expect(result.fragments[0].rawProgramDateTime).to.not.exist;
+      expect(result.fragments[0].programDateTime).to.not.exist;
     });
   });
 
-  it('tests : at end of tag name is used to divide custom tags', () => {
+  it('tests : at end of tag name is used to divide custom tags', function () {
     let level = `#EXTM3U
 #EXT-X-VERSION:2
 #EXT-X-TARGETDURATION:10
@@ -802,15 +799,15 @@ http://dummy.url.com/hls/live/segment/segment_022916_164500865_719927.ts
 http://dummy.url.com/hls/live/segment/segment_022916_164500865_719928.ts
     `;
     let result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.url.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments[2].tagList[0][0], 'EXT-X-CUSTOM-DATE');
-    assert.strictEqual(result.fragments[2].tagList[0][1], '2016-05-27T16:34:44Z');
-    assert.strictEqual(result.fragments[2].tagList[1][0], 'EXT-X-CUSTOM-JSON');
-    assert.strictEqual(result.fragments[2].tagList[1][1], '{"key":"value"}');
-    assert.strictEqual(result.fragments[2].tagList[2][0], 'EXT-X-CUSTOM-URI');
-    assert.strictEqual(result.fragments[2].tagList[2][1], 'http://dummy.url.com/hls/moreinfo.json');
+    expect(result.fragments[2].tagList[0][0]).to.equal('EXT-X-CUSTOM-DATE');
+    expect(result.fragments[2].tagList[0][1]).to.equal('2016-05-27T16:34:44Z');
+    expect(result.fragments[2].tagList[1][0]).to.equal('EXT-X-CUSTOM-JSON');
+    expect(result.fragments[2].tagList[1][1]).to.equal('{"key":"value"}');
+    expect(result.fragments[2].tagList[2][0]).to.equal('EXT-X-CUSTOM-URI');
+    expect(result.fragments[2].tagList[2][1]).to.equal('http://dummy.url.com/hls/moreinfo.json');
   });
 
-  it('allows spaces in the fragment files', () => {
+  it('allows spaces in the fragment files', function () {
     const level = `#EXTM3U
 #EXT-X-VERSION:4
 #EXT-X-TARGETDURATION:7
@@ -823,14 +820,14 @@ http://dummy.url.com/hls/live/segment/segment_022916_164500865_719928.ts
 #EXT-X-ENDLIST
     `;
     const result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.url.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 2);
-    assert.strictEqual(result.totalduration, 12.012);
-    assert.strictEqual(result.targetduration, 7);
-    assert.strictEqual(result.fragments[0].url, 'http://dummy.url.com/180724_Allison VLOG-v3_00001.ts');
-    assert.strictEqual(result.fragments[1].url, 'http://dummy.url.com/180724_Allison VLOG-v3_00002.ts');
+    expect(result.fragments.length).to.equal(2);
+    expect(result.totalduration).to.equal(12.012);
+    expect(result.targetduration).to.equal(7);
+    expect(result.fragments[0].url).to.equal('http://dummy.url.com/180724_Allison VLOG-v3_00001.ts');
+    expect(result.fragments[1].url).to.equal('http://dummy.url.com/180724_Allison VLOG-v3_00002.ts');
   });
 
-  it('deals with spaces after fragment files', () => {
+  it('deals with spaces after fragment files', function () {
     // You can't see them, but there should be spaces directly after the .ts
     const level = `#EXTM3U
 #EXT-X-VERSION:4
@@ -844,10 +841,10 @@ http://dummy.url.com/hls/live/segment/segment_022916_164500865_719928.ts
 #EXT-X-ENDLIST
     `;
     const result = M3U8Parser.parseLevelPlaylist(level, 'http://dummy.url.com/playlist.m3u8', 0);
-    assert.strictEqual(result.fragments.length, 2);
-    assert.strictEqual(result.totalduration, 12.012);
-    assert.strictEqual(result.targetduration, 7);
-    assert.strictEqual(result.fragments[0].url, 'http://dummy.url.com/180724_Allison VLOG v3_00001.ts');
-    assert.strictEqual(result.fragments[1].url, 'http://dummy.url.com/180724_Allison VLOG v3_00002.ts');
+    expect(result.fragments.length).to.equal(2);
+    expect(result.totalduration).to.equal(12.012);
+    expect(result.targetduration).to.equal(7);
+    expect(result.fragments[0].url).to.equal('http://dummy.url.com/180724_Allison VLOG v3_00001.ts');
+    expect(result.fragments[1].url).to.equal('http://dummy.url.com/180724_Allison VLOG v3_00002.ts');
   });
 });
diff --git a/tests/unit/utils/attr-list.js b/tests/unit/utils/attr-list.js
index 7ed7514988c..4986972104d 100644
--- a/tests/unit/utils/attr-list.js
+++ b/tests/unit/utils/attr-list.js
@@ -1,130 +1,126 @@
 import AttrList from '../../../src/utils/attr-list';
 
-const assert = require('assert');
-const bufferIsEqual = require('arraybuffer-equal');
-const deepStrictEqual = require('deep-strict-equal');
-
-describe('AttrList', () => {
-  it('constructor() supports empty arguments', () => {
-    assert.deepEqual(new AttrList(), {});
-    assert.deepEqual(new AttrList({}), {});
-    assert.deepEqual(new AttrList(undefined), {});
+describe('AttrList', function () {
+  it('constructor() supports empty arguments', function () {
+    expect(Object.keys(new AttrList())).to.deep.equal([]);
+    expect(Object.keys(new AttrList({}))).to.deep.equal([]);
+    expect(Object.keys(new AttrList(undefined))).to.deep.equal([]);
   });
-  it('constructor() supports object argument', () => {
+  it('constructor() supports object argument', function () {
     const obj = { VALUE: '42' };
     const list = new AttrList(obj);
-    assert.strictEqual(list.decimalInteger('VALUE'), 42);
-    assert.strictEqual(Object.keys(list).length, 1);
+    expect(list.decimalInteger('VALUE')).to.equal(42);
+    expect(Object.keys(list).length).to.equal(1);
   });
 
-  it('parses valid decimalInteger attribute', () => {
-    assert.strictEqual(new AttrList('INT=42').decimalInteger('INT'), 42);
-    assert.strictEqual(new AttrList('INT=0').decimalInteger('INT'), 0);
-    assert.strictEqual(new AttrList('INT="42"').decimalInteger('INT'), 42);
+  it('parses valid decimalInteger attribute', function () {
+    expect(new AttrList('INT=42').decimalInteger('INT')).to.equal(42);
+    expect(new AttrList('INT=0').decimalInteger('INT')).to.equal(0);
+    expect(new AttrList('INT="42"').decimalInteger('INT')).to.equal(42);
   });
 
-  it('parses attribute with leading space', () => {
-    assert.strictEqual(new AttrList(' INT=42').decimalInteger('INT'), 42);
-    assert.strictEqual(new AttrList(' INT=0').decimalInteger('INT'), 0);
-    assert.strictEqual(new AttrList(' INT="42"').decimalInteger('INT'), 42);
+  it('parses attribute with leading space', function () {
+    expect(new AttrList(' INT=42').decimalInteger('INT')).to.equal(42);
+    expect(new AttrList(' INT=0').decimalInteger('INT')).to.equal(0);
+    expect(new AttrList(' INT="42"').decimalInteger('INT')).to.equal(42);
   });
 
-  it('parses attribute with trailing space', () => {
-    assert.strictEqual(new AttrList('INT =42').decimalInteger('INT'), 42);
-    assert.strictEqual(new AttrList('INT =0').decimalInteger('INT'), 0);
-    assert.strictEqual(new AttrList('INT ="42"').decimalInteger('INT'), 42);
+  it('parses attribute with trailing space', function () {
+    expect(new AttrList('INT =42').decimalInteger('INT')).to.equal(42);
+    expect(new AttrList('INT =0').decimalInteger('INT')).to.equal(0);
+    expect(new AttrList('INT ="42"').decimalInteger('INT')).to.equal(42);
   });
 
-  it('parses valid hexadecimalInteger attribute', () => {
-    assert.strictEqual(new AttrList('HEX=0x42').hexadecimalIntegerAsNumber('HEX'), 0x42);
-    assert.strictEqual(new AttrList('HEX=0X42').hexadecimalIntegerAsNumber('HEX'), 0x42);
-    assert.strictEqual(new AttrList('HEX=0x0').hexadecimalIntegerAsNumber('HEX'), 0);
-    assert.strictEqual(new AttrList('HEX="0x42"').hexadecimalIntegerAsNumber('HEX'), 0x42);
-  });
-  it('parses valid decimalFloatingPoint attribute', () => {
-    assert.strictEqual(new AttrList('FLOAT=0.42').decimalFloatingPoint('FLOAT'), 0.42);
-    assert.strictEqual(new AttrList('FLOAT=-0.42').decimalFloatingPoint('FLOAT'), -0.42);
-    assert.strictEqual(new AttrList('FLOAT=0').decimalFloatingPoint('FLOAT'), 0);
-    assert.strictEqual(new AttrList('FLOAT="0.42"').decimalFloatingPoint('FLOAT'), 0.42);
-  });
-  it('parses valid quotedString attribute', () => {
-    assert.strictEqual(new AttrList('STRING="hi"').STRING, 'hi');
-    assert.strictEqual(new AttrList('STRING=""').STRING, '');
-  });
-  it('parses exotic quotedString attribute', () => {
+  it('parses valid hexadecimalInteger attribute', function () {
+    expect(new AttrList('HEX=0x42').hexadecimalIntegerAsNumber('HEX')).to.equal(0x42);
+    expect(new AttrList('HEX=0X42').hexadecimalIntegerAsNumber('HEX')).to.equal(0x42);
+    expect(new AttrList('HEX=0x0').hexadecimalIntegerAsNumber('HEX')).to.equal(0);
+    expect(new AttrList('HEX="0x42"').hexadecimalIntegerAsNumber('HEX')).to.equal(0x42);
+  });
+  it('parses valid decimalFloatingPoint attribute', function () {
+    expect(new AttrList('FLOAT=0.42').decimalFloatingPoint('FLOAT')).to.equal(0.42);
+    expect(new AttrList('FLOAT=-0.42').decimalFloatingPoint('FLOAT')).to.equal(-0.42);
+    expect(new AttrList('FLOAT=0').decimalFloatingPoint('FLOAT')).to.equal(0);
+    expect(new AttrList('FLOAT="0.42"').decimalFloatingPoint('FLOAT')).to.equal(0.42);
+  });
+  it('parses valid quotedString attribute', function () {
+    expect(new AttrList('STRING="hi"').STRING).to.equal('hi');
+    expect(new AttrList('STRING=""').STRING).to.equal('');
+  });
+  it('parses exotic quotedString attribute', function () {
     const list = new AttrList('STRING="hi,ENUM=OK,RES=4x2"');
-    assert.strictEqual(list.STRING, 'hi,ENUM=OK,RES=4x2');
-    assert.strictEqual(Object.keys(list).length, 1);
+    expect(list.STRING).to.equal('hi,ENUM=OK,RES=4x2');
+    expect(Object.keys(list).length).to.equal(1);
   });
-  it('parses valid enumeratedString attribute', () => {
-    assert.strictEqual(new AttrList('ENUM=OK').enumeratedString('ENUM'), 'OK');
-    assert.strictEqual(new AttrList('ENUM="OK"').enumeratedString('ENUM'), 'OK');
+  it('parses valid enumeratedString attribute', function () {
+    expect(new AttrList('ENUM=OK').enumeratedString('ENUM')).to.equal('OK');
+    expect(new AttrList('ENUM="OK"').enumeratedString('ENUM')).to.equal('OK');
   });
-  it('parses exotic enumeratedString attribute', () => {
-    assert.strictEqual(new AttrList('ENUM=1').enumeratedString('ENUM'), '1');
-    assert.strictEqual(new AttrList('ENUM=A=B').enumeratedString('ENUM'), 'A=B');
-    assert.strictEqual(new AttrList('ENUM=A=B=C').enumeratedString('ENUM'), 'A=B=C');
+  it('parses exotic enumeratedString attribute', function () {
+    expect(new AttrList('ENUM=1').enumeratedString('ENUM')).to.equal('1');
+    expect(new AttrList('ENUM=A=B').enumeratedString('ENUM')).to.equal('A=B');
+    expect(new AttrList('ENUM=A=B=C').enumeratedString('ENUM')).to.equal('A=B=C');
     const list = new AttrList('ENUM1=A=B=C,ENUM2=42');
-    assert.strictEqual(list.enumeratedString('ENUM1'), 'A=B=C');
-    assert.strictEqual(list.enumeratedString('ENUM2'), '42');
-  });
-  it('parses valid decimalResolution attribute', () => {
-    assert(deepStrictEqual(new AttrList('RES=400x200').decimalResolution('RES'), { width: 400, height: 200 }));
-    assert(deepStrictEqual(new AttrList('RES=0x0').decimalResolution('RES'), { width: 0, height: 0 }));
-    assert(deepStrictEqual(new AttrList('RES="400x200"').decimalResolution('RES'), { width: 400, height: 200 }));
-  });
-  it('handles invalid decimalResolution attribute', () => {
-    assert(deepStrictEqual(new AttrList('RES=400x-200').decimalResolution('RES'), undefined));
-    assert(deepStrictEqual(new AttrList('RES=400.5x200').decimalResolution('RES'), undefined));
-    assert(deepStrictEqual(new AttrList('RES=400x200.5').decimalResolution('RES'), undefined));
-    assert(deepStrictEqual(new AttrList('RES=400').decimalResolution('RES'), undefined));
-    assert(deepStrictEqual(new AttrList('RES=400x').decimalResolution('RES'), undefined));
-    assert(deepStrictEqual(new AttrList('RES=x200').decimalResolution('RES'), undefined));
-    assert(deepStrictEqual(new AttrList('RES=x').decimalResolution('RES'), undefined));
+    expect(list.enumeratedString('ENUM1')).to.equal('A=B=C');
+    expect(list.enumeratedString('ENUM2')).to.equal('42');
+  });
+  it('parses valid decimalResolution attribute', function () {
+    expect(new AttrList('RES=400x200').decimalResolution('RES')).to.deep.equal({ width: 400, height: 200 });
+    expect(new AttrList('RES=0x0').decimalResolution('RES')).to.deep.equal({ width: 0, height: 0 });
+    expect(new AttrList('RES="400x200"').decimalResolution('RES')).to.deep.equal({ width: 400, height: 200 });
+  });
+  it('handles invalid decimalResolution attribute', function () {
+    expect(new AttrList('RES=400x-200').decimalResolution('RES')).to.not.exist;
+    expect(new AttrList('RES=400.5x200').decimalResolution('RES')).to.not.exist;
+    expect(new AttrList('RES=400x200.5').decimalResolution('RES')).to.not.exist;
+    expect(new AttrList('RES=400').decimalResolution('RES')).to.not.exist;
+    expect(new AttrList('RES=400x').decimalResolution('RES')).to.not.exist;
+    expect(new AttrList('RES=x200').decimalResolution('RES')).to.not.exist;
+    expect(new AttrList('RES=x').decimalResolution('RES')).to.not.exist;
   });
 
-  it('parses multiple attributes', () => {
+  it('parses multiple attributes', function () {
     const list = new AttrList('INT=42,HEX=0x42,FLOAT=0.42,STRING="hi",ENUM=OK,RES=4x2');
-    assert.strictEqual(list.decimalInteger('INT'), 42);
-    assert.strictEqual(list.hexadecimalIntegerAsNumber('HEX'), 0x42);
-    assert.strictEqual(list.decimalFloatingPoint('FLOAT'), 0.42);
-    assert.strictEqual(list.STRING, 'hi');
-    assert.strictEqual(list.enumeratedString('ENUM'), 'OK');
-    assert(deepStrictEqual(list.decimalResolution('RES'), { width: 4, height: 2 }));
-    assert.strictEqual(Object.keys(list).length, 6);
+    expect(list.decimalInteger('INT')).to.equal(42);
+    expect(list.hexadecimalIntegerAsNumber('HEX')).to.equal(0x42);
+    expect(list.decimalFloatingPoint('FLOAT')).to.equal(0.42);
+    expect(list.STRING).to.equal('hi');
+    expect(list.enumeratedString('ENUM')).to.equal('OK');
+    expect(list.decimalResolution('RES')).to.deep.equal({ width: 4, height: 2 });
+    expect(Object.keys(list).length).to.equal(6);
   });
 
-  it('handles missing attributes', () => {
+  it('handles missing attributes', function () {
     const list = new AttrList();
-    assert(isNaN(list.decimalInteger('INT')));
-    assert(isNaN(list.hexadecimalIntegerAsNumber('HEX')));
-    assert(isNaN(list.decimalFloatingPoint('FLOAT')));
-    assert.strictEqual(list.STRING, undefined);
-    assert.strictEqual(list.enumeratedString('ENUM'), undefined);
-    assert.strictEqual(list.decimalResolution('RES'), undefined);
-    assert.strictEqual(Object.keys(list).length, 0);
+    expect(list.decimalInteger('INT')).to.be.NaN;
+    expect(list.hexadecimalIntegerAsNumber('HEX')).to.be.NaN;
+    expect(list.decimalFloatingPoint('FLOAT')).to.be.NaN;
+    expect(list.STRING).to.not.exist;
+    expect(list.enumeratedString('ENUM')).to.not.exist;
+    expect(list.decimalResolution('RES')).to.not.exist;
+    expect(Object.keys(list)).to.have.lengthOf(0);
   });
 
-  it('parses dashed attribute names', () => {
+  it('parses dashed attribute names', function () {
     const list = new AttrList('INT-VALUE=42,H-E-X=0x42,-FLOAT=0.42,STRING-="hi",ENUM=OK');
-    assert.strictEqual(list.decimalInteger('INT-VALUE'), 42);
-    assert.strictEqual(list.hexadecimalIntegerAsNumber('H-E-X'), 0x42);
-    assert.strictEqual(list.decimalFloatingPoint('-FLOAT'), 0.42);
-    assert.strictEqual(list['STRING-'], 'hi');
-    assert.strictEqual(list.enumeratedString('ENUM'), 'OK');
-    assert.strictEqual(Object.keys(list).length, 5);
+    expect(list.decimalInteger('INT-VALUE')).to.equal(42);
+    expect(list.hexadecimalIntegerAsNumber('H-E-X')).to.equal(0x42);
+    expect(list.decimalFloatingPoint('-FLOAT')).to.equal(0.42);
+    expect(list['STRING-']).to.equal('hi');
+    expect(list.enumeratedString('ENUM')).to.equal('OK');
+    expect(Object.keys(list).length).to.equal(5);
   });
 
-  it('handles hexadecimalInteger conversions', () => {
+  it('handles hexadecimalInteger conversions', function () {
     const list = new AttrList('HEX1=0x0123456789abcdef0123456789abcdef,HEX2=0x123,HEX3=0x0');
-    assert(bufferIsEqual(list.hexadecimalInteger('HEX1').buffer, new Uint8Array([0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]).buffer));
-    assert(bufferIsEqual(list.hexadecimalInteger('HEX2').buffer, new Uint8Array([0x01, 0x23]).buffer));
-    assert(bufferIsEqual(list.hexadecimalInteger('HEX3').buffer, new Uint8Array([0x0]).buffer));
+    expect(list.hexadecimalInteger('HEX1').buffer).to.deep.equal(new Uint8Array([0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]).buffer);
+    expect(list.hexadecimalInteger('HEX2').buffer).to.deep.equal(new Uint8Array([0x01, 0x23]).buffer);
+    expect(list.hexadecimalInteger('HEX3').buffer).to.deep.equal(new Uint8Array([0x0]).buffer);
   });
 
-  it('returns infinity on large number conversions', () => {
+  it('returns infinity on large number conversions', function () {
     const list = new AttrList('VAL=12345678901234567890,HEX=0x0123456789abcdef0123456789abcdef');
-    assert.strictEqual(list.decimalInteger('VAL'), Infinity);
-    assert.strictEqual(list.hexadecimalIntegerAsNumber('HEX'), Infinity);
+    expect(list.decimalInteger('VAL')).to.equal(Infinity);
+    expect(list.hexadecimalIntegerAsNumber('HEX')).to.equal(Infinity);
   });
 });
diff --git a/tests/unit/utils/binary-search.js b/tests/unit/utils/binary-search.js
index b13bb44b450..e61d9ebbec7 100644
--- a/tests/unit/utils/binary-search.js
+++ b/tests/unit/utils/binary-search.js
@@ -1,5 +1,4 @@
 import BinarySearch from '../../../src/utils/binary-search';
-let assert = require('assert');
 
 describe('binary search util', function () {
   describe('search helper', function () {
@@ -23,13 +22,13 @@ describe('binary search util', function () {
       for (let i = 0; i < list.length; i++) {
         let item = list[i];
         let foundItem = BinarySearch.search(list, buildComparisonFunction(item));
-        assert.strictEqual(foundItem, item);
+        expect(foundItem).to.equal(item);
       }
     });
     it('does not find the element if it is not present', function () {
       let item = 1000;
       let foundItem = BinarySearch.search(list, buildComparisonFunction(item));
-      assert.strictEqual(foundItem, null);
+      expect(foundItem).to.not.exist;
     });
   });
 });
diff --git a/tests/unit/utils/buffer-helper.js b/tests/unit/utils/buffer-helper.js
index 8240927abb6..7d51399e8a6 100644
--- a/tests/unit/utils/buffer-helper.js
+++ b/tests/unit/utils/buffer-helper.js
@@ -1,7 +1,5 @@
 import { BufferHelper } from '../../../src/utils/buffer-helper';
 
-const assert = require('assert');
-
 function createMockBuffer (buffered) {
   return {
     start: i => (buffered.length > i) ? buffered[i].startPTS : null,
@@ -30,31 +28,34 @@ describe('BufferHelper', function () {
     };
 
     it('should return true if some media.buffered includes the position', function () {
-      assert.equal(BufferHelper.isBuffered(media, 0), true);
-      assert.equal(BufferHelper.isBuffered(media, 0.1), true);
-      assert.equal(BufferHelper.isBuffered(media, 0.5), true);
-      assert.equal(BufferHelper.isBuffered(media, 1), true);
-      assert.equal(BufferHelper.isBuffered(media, 2), true);
+      expect(BufferHelper.isBuffered(media, 0)).to.be.true;
+      expect(BufferHelper.isBuffered(media, 0.1)).to.be.true;
+      expect(BufferHelper.isBuffered(media, 0.5)).to.be.true;
+      expect(BufferHelper.isBuffered(media, 1)).to.be.true;
+      expect(BufferHelper.isBuffered(media, 2)).to.be.true;
     });
+
     it('should return false if any media.buffered does not includes the position', function () {
-      assert.equal(BufferHelper.isBuffered(media, -0.1), false);
-      assert.equal(BufferHelper.isBuffered(media, 0.51), false);
-      assert.equal(BufferHelper.isBuffered(media, 0.9), false);
-      assert.equal(BufferHelper.isBuffered(media, 2.1), false);
+      expect(BufferHelper.isBuffered(media, -0.1)).to.be.false;
+      expect(BufferHelper.isBuffered(media, 0.51)).to.be.false;
+      expect(BufferHelper.isBuffered(media, 0.9)).to.be.false;
+      expect(BufferHelper.isBuffered(media, 2.1)).to.be.false;
     });
+
     it('should return false if media.buffered throws error', function () {
       const invalidMedia = {
         get buffered () {
           throw new Error('InvalidStateError');
         }
       };
-      assert.equal(BufferHelper.isBuffered(invalidMedia, 0), false);
+      expect(BufferHelper.isBuffered(invalidMedia, 0)).to.be.false;
     });
     it('should return false if media does not exist', function () {
-      assert.equal(BufferHelper.isBuffered(null, 0), false);
+      expect(BufferHelper.isBuffered(null, 0)).to.be.false;
     });
   });
-  describe('bufferInfo', () => {
+
+  describe('bufferInfo', function () {
     it('should return found buffer info if some media.buffered includes pos with allowed error', function () {
       // |////////|________|////////////////|
       // 0       0.5       1                2
@@ -73,7 +74,7 @@ describe('BufferHelper', function () {
         }
       };
       const maxHoleDuration = 0;
-      assert.deepEqual(BufferHelper.bufferInfo(media, 0, maxHoleDuration), {
+      expect(BufferHelper.bufferInfo(media, 0, maxHoleDuration)).to.deep.equal({
         len: 0.5,
         start: 0,
         end: 0.5,
@@ -87,7 +88,7 @@ describe('BufferHelper', function () {
         }
       };
       const maxHoleDuration = 0;
-      assert.deepEqual(BufferHelper.bufferInfo(invalidMedia, 0, maxHoleDuration), {
+      expect(BufferHelper.bufferInfo(invalidMedia, 0, maxHoleDuration)).to.deep.equal({
         len: 0,
         start: 0,
         end: 0,
@@ -96,7 +97,7 @@ describe('BufferHelper', function () {
     });
     it('should return empty buffer info if media does not exist', function () {
       const maxHoleDuration = 0;
-      assert.deepEqual(BufferHelper.bufferInfo(null, 0, maxHoleDuration), {
+      expect(BufferHelper.bufferInfo(null, 0, maxHoleDuration)).to.deep.equal({
         len: 0,
         start: 0,
         end: 0,
@@ -104,7 +105,8 @@ describe('BufferHelper', function () {
       });
     });
   });
-  describe('bufferedInfo', () => {
+
+  describe('bufferedInfo', function () {
     it('should return found buffer info when maxHoleDuration is 0', function () {
       // |////////|________|////////////////|
       // 0       0.5       1                2
@@ -119,25 +121,25 @@ describe('BufferHelper', function () {
         }
       ];
       const maxHoleDuration = 0;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration)).to.deep.equal({
         len: 0.5,
         start: 0,
         end: 0.5,
         nextStart: 1
       });
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration)).to.deep.equal({
         len: 0,
         start: 0.5,
         end: 0.5,
         nextStart: 1
       });
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 1, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 1, maxHoleDuration)).to.deep.equal({
         len: 1,
         start: 1,
         end: 2,
         nextStart: undefined
       });
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 1.5, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 1.5, maxHoleDuration)).to.deep.equal({
         len: 0.5,
         start: 1,
         end: 2,
@@ -158,7 +160,7 @@ describe('BufferHelper', function () {
         }
       ];
       const maxHoleDuration = 0.5;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration)).to.deep.equal({
         len: 0.5,
         start: 0,
         end: 0.5,
@@ -167,19 +169,19 @@ describe('BufferHelper', function () {
       // M: maxHoleDuration: 0.5
       // |////////|________|////////////////|
       // 0       0.5 - M - 1                2
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration)).to.deep.equal({
         len: 1.5,
         start: 1,
         end: 2,
         nextStart: undefined
       });
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 1, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 1, maxHoleDuration)).to.deep.equal({
         len: 1,
         start: 1,
         end: 2,
         nextStart: undefined
       });
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 2, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 2, maxHoleDuration)).to.deep.equal({
         len: 0,
         start: 2,
         end: 2,
@@ -200,7 +202,7 @@ describe('BufferHelper', function () {
         }
       ];
       const maxHoleDuration = 0.5;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0, maxHoleDuration)).to.deep.equal({
         len: 0.5,
         start: 0,
         end: 0.5,
@@ -221,7 +223,7 @@ describe('BufferHelper', function () {
         }
       ];
       const maxHoleDuration = 1;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.8, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0.8, maxHoleDuration)).to.deep.equal({
         len: 1.2,
         start: 0,
         end: 2,
@@ -243,7 +245,7 @@ describe('BufferHelper', function () {
         }
       ];
       const maxHoleDuration = 0.5;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 0.5, maxHoleDuration)).to.deep.equal({
         len: 0.5,
         start: 0,
         end: 1,
@@ -262,7 +264,7 @@ describe('BufferHelper', function () {
         }
       ];
       const maxHoleDuration = 0;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 5, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 5, maxHoleDuration)).to.deep.equal({
         len: 0,
         start: 5,
         end: 5,
@@ -272,7 +274,7 @@ describe('BufferHelper', function () {
     it('should return empty buffered if buffered is empty', function () {
       const buffered = [];
       const maxHoleDuration = 0;
-      assert.deepEqual(BufferHelper.bufferedInfo(buffered, 5, maxHoleDuration), {
+      expect(BufferHelper.bufferedInfo(buffered, 5, maxHoleDuration)).to.deep.equal({
         len: 0,
         start: 5,
         end: 5,
diff --git a/tests/unit/utils/discontinuities.js b/tests/unit/utils/discontinuities.js
index 5a27ec0a35a..3207426c00c 100644
--- a/tests/unit/utils/discontinuities.js
+++ b/tests/unit/utils/discontinuities.js
@@ -1,7 +1,5 @@
 import { shouldAlignOnDiscontinuities, findDiscontinuousReferenceFrag, adjustPts, alignDiscontinuities, alignPDT } from '../../../src/utils/discontinuities';
 
-const assert = require('assert');
-
 const mockReferenceFrag = {
   start: 20,
   startPTS: 20,
@@ -65,8 +63,8 @@ describe('level-helper', function () {
     ];
 
     adjustPts(mockReferenceFrag.start, details);
-    assert.deepEqual(expected, details.fragments);
-    assert.equal(true, details.PTSKnown);
+    expect(expected).to.deep.equal(details.fragments);
+    expect(details.PTSKnown).to.be.true;
   });
 
   it('adjusts level fragments without overlapping CC range but with programDateTime info', function () {
@@ -163,7 +161,7 @@ describe('level-helper', function () {
       hasProgramDateTime: true
     };
     alignPDT(details, lastLevel.details);
-    assert.deepEqual(detailsExpected, details);
+    expect(detailsExpected).to.deep.equal(details);
   });
 
   it('finds the first fragment in an array which matches the CC of the first fragment in another array', function () {
@@ -175,25 +173,25 @@ describe('level-helper', function () {
     };
     const expected = mockReferenceFrag;
     const actual = findDiscontinuousReferenceFrag(prevDetails, curDetails);
-    assert.equal(expected, actual);
+    expect(actual).to.equal(expected);
   });
 
   it('returns undefined if there are no frags in the previous level', function () {
     const expected = undefined;
     const actual = findDiscontinuousReferenceFrag({ fragments: [] }, { fragments: mockFrags });
-    assert.equal(expected, actual);
+    expect(actual).to.equal(expected);
   });
 
   it('returns undefined if there are no matching frags in the previous level', function () {
     const expected = undefined;
     const actual = findDiscontinuousReferenceFrag({ fragments: [{ cc: 10 }] }, { fragments: mockFrags });
-    assert.equal(expected, actual);
+    expect(actual).to.equal(expected);
   });
 
   it('returns undefined if there are no frags in the current level', function () {
     const expected = undefined;
     const actual = findDiscontinuousReferenceFrag({ fragments: [{ cc: 0 }] }, { fragments: [] });
-    assert.equal(expected, actual);
+    expect(actual).to.equal(expected);
   });
 
   it('should align current level when CC increases within the level', function () {
@@ -206,7 +204,7 @@ describe('level-helper', function () {
     };
 
     const actual = shouldAlignOnDiscontinuities(null, lastLevel, curDetails);
-    assert.equal(true, actual);
+    expect(actual).to.be.true;
   });
 
   it('should align current level when CC increases from last frag to current level', function () {
@@ -222,7 +220,7 @@ describe('level-helper', function () {
     };
 
     const actual = shouldAlignOnDiscontinuities(lastFrag, lastLevel, curDetails);
-    assert.equal(true, actual);
+    expect(actual).to.be.true;
   });
 
   it('should not align when there is no CC increase', function () {
@@ -238,7 +236,7 @@ describe('level-helper', function () {
     };
 
     const actual = shouldAlignOnDiscontinuities(lastFrag, lastLevel, curDetails);
-    assert.equal(false, actual);
+    expect(actual).to.be.false;
   });
 
   it('should not align when there is no previous level', function () {
@@ -251,7 +249,7 @@ describe('level-helper', function () {
     };
 
     const actual = shouldAlignOnDiscontinuities(lastFrag, null, curDetails);
-    assert.equal(false, actual);
+    expect(actual).to.be.false;
   });
 
   it('should not align when there are no previous level details', function () {
@@ -266,7 +264,7 @@ describe('level-helper', function () {
     };
 
     const actual = shouldAlignOnDiscontinuities(lastFrag, lastLevel, curDetails);
-    assert.equal(false, actual);
+    expect(actual).to.be.false;
   });
 
   it('should not align when there are no current level details', function () {
@@ -278,6 +276,6 @@ describe('level-helper', function () {
     };
 
     const actual = shouldAlignOnDiscontinuities(lastFrag, lastLevel, null);
-    assert.equal(false, actual);
+    expect(actual).to.be.false;
   });
 });
diff --git a/tests/unit/utils/output-filter.js b/tests/unit/utils/output-filter.js
index bb566d55d36..9ca6233005f 100644
--- a/tests/unit/utils/output-filter.js
+++ b/tests/unit/utils/output-filter.js
@@ -1,22 +1,12 @@
 import OutputFilter from '../../../src/utils/output-filter';
-const assert = require('assert');
 
-describe('OutputFilter', () => {
-  let createMockTimelineController = () => {
-    let callCount = 0;
-    let lastCueArguments = null;
-    let captionsTrackCalled = false;
+describe('OutputFilter', function () {
+  const sandbox = sinon.createSandbox();
+
+  let createMockTimelineController = function () {
     return {
-      addCues: (trackName, startTime, endTime, screen) => {
-        lastCueArguments = { trackName, startTime, endTime, screen };
-        callCount++;
-      },
-      createCaptionsTrack: (track) => {
-        captionsTrackCalled = true;
-      },
-      getCallCount: () => callCount,
-      getLastCueAdded: () => lastCueArguments,
-      didCaptionsTrackInvoke: () => captionsTrackCalled
+      addCues: sandbox.spy(),
+      createCaptionsTrack: sandbox.spy()
     };
   };
 
@@ -27,42 +17,36 @@ describe('OutputFilter', () => {
     outputFilter = new OutputFilter(timelineController, 1);
   });
 
-  it('handles new cue without dispatching', () => {
+  it('handles new cue without dispatching', function () {
     outputFilter.newCue(0, 1, {});
-    let lastCueAdded = timelineController.getLastCueAdded();
-    assert.strictEqual(lastCueAdded, null);
-    assert.strictEqual(timelineController.getCallCount(), 0);
-    assert.strictEqual(timelineController.didCaptionsTrackInvoke(), true);
+    expect(timelineController.addCues).to.not.have.been.called;
+    expect(timelineController.createCaptionsTrack).to.have.been.called;
   });
 
-  it('handles single cue and dispatch', () => {
+  it('handles single cue and dispatch', function () {
     let lastScreen = {};
     outputFilter.newCue(0, 1, lastScreen);
     outputFilter.dispatchCue();
-    let lastCueAdded = timelineController.getLastCueAdded();
-    assert.strictEqual(lastCueAdded.screen, lastScreen);
-    assert.strictEqual(timelineController.getCallCount(), 1);
+    expect(timelineController.addCues).to.have.been.calledOnce;
+    expect(timelineController.addCues).to.have.been.calledWith(1, 0, 1, lastScreen);
   });
 
-  it('handles multiple cues and dispatch', () => {
+  it('handles multiple cues and dispatch', function () {
     outputFilter.newCue(0, 1, {});
     outputFilter.newCue(1, 2, {});
     let lastScreen = {};
     outputFilter.newCue(3, 4, lastScreen);
     outputFilter.dispatchCue();
-    let lastCueAdded = timelineController.getLastCueAdded();
-    assert.strictEqual(timelineController.getCallCount(), 1);
-    assert.strictEqual(lastCueAdded.startTime, 0);
-    assert.strictEqual(lastCueAdded.endTime, 4);
-    assert.strictEqual(lastCueAdded.screen, lastScreen);
+    expect(timelineController.addCues).to.have.been.calledOnce;
+    expect(timelineController.addCues).to.have.been.calledWith(1, 0, 4, lastScreen);
   });
 
-  it('does not dispatch empty cues', () => {
+  it('does not dispatch empty cues', function () {
     outputFilter.newCue(0, 1, {});
-    assert.strictEqual(timelineController.getCallCount(), 0);
+    expect(timelineController.addCues).to.not.have.been.called;
     outputFilter.dispatchCue();
-    assert.strictEqual(timelineController.getCallCount(), 1);
+    expect(timelineController.addCues).to.have.been.calledOnce;
     outputFilter.dispatchCue();
-    assert.strictEqual(timelineController.getCallCount(), 1);
+    expect(timelineController.addCues).to.have.been.calledOnce;
   });
 });

From 260a8a0ad6c8e19092e21f455de3090cff2f839b Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <1956521+itsjamie@users.noreply.github.com>
Date: Sat, 26 Jan 2019 09:54:08 -0400
Subject: [PATCH 21/59] Fix #2061

---
 src/demux/demuxer-inline.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/demux/demuxer-inline.js b/src/demux/demuxer-inline.js
index 6f5c6b50d4f..d7e214a2614 100644
--- a/src/demux/demuxer-inline.js
+++ b/src/demux/demuxer-inline.js
@@ -73,7 +73,7 @@ class DemuxerInline {
       const observer = this.observer;
       const typeSupported = this.typeSupported;
       const config = this.config;
-      // probing order is TS/AAC/MP3/MP4
+      // probing order is TS/MP4/AAC/MP3
       const muxConfig = [
         { demux: TSDemuxer, remux: MP4Remuxer },
         { demux: MP4Demuxer, remux: PassThroughRemuxer },

From d93d4539557ad9c1ff78bd0a1c357cd163e38d3c Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tom.jenkinson@soundcloud.com>
Date: Sat, 26 Jan 2019 17:57:06 +0100
Subject: [PATCH 22/59] configure netlify for PR's

this follows the same process that runs for canary releases
---
 netlify.toml                                  | 14 ++++++
 scripts/build-netlify.sh                      | 17 +++++++
 ...ld-deploy-netlify.sh => deploy-netlify.sh} | 15 +------
 scripts/travis.sh                             | 44 +++++++++++--------
 4 files changed, 57 insertions(+), 33 deletions(-)
 create mode 100644 netlify.toml
 create mode 100755 scripts/build-netlify.sh
 rename scripts/{build-deploy-netlify.sh => deploy-netlify.sh} (84%)

diff --git a/netlify.toml b/netlify.toml
new file mode 100644
index 00000000000..4467e681793
--- /dev/null
+++ b/netlify.toml
@@ -0,0 +1,14 @@
+# https://www.netlify.com/docs/netlify-toml-reference/
+
+# Settings in the [build] context are global and are applied to all contexts
+# unless otherwise overridden by more specific contexts.
+[build]
+  # Directory (relative to root of your repo) that contains the deploy-ready
+  # HTML files and assets generated by the build. If a base directory has
+  # been specified, include it in the publish directory path.
+  publish = "netlify"
+
+# Deploy Preview context: all deploys resulting from a pull/merge request will
+# inherit these settings.
+[context.deploy-preview]
+  command = "TRAVIS_MODE=netlifyPr ./scripts/travis.sh"
diff --git a/scripts/build-netlify.sh b/scripts/build-netlify.sh
new file mode 100755
index 00000000000..d409884c48f
--- /dev/null
+++ b/scripts/build-netlify.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+
+root="./netlify"
+
+rm -rf "$root"
+mkdir "$root"
+
+echo "Building netlify..."
+
+# redirect / to /demo
+echo "/ /demo" > "$root/_redirects"
+cp -r "./dist" "$root/dist"
+cp -r "./demo" "$root/demo"
+cp -r "./api-docs" "$root/api-docs"
+
+echo "Built netlify."
diff --git a/scripts/build-deploy-netlify.sh b/scripts/deploy-netlify.sh
similarity index 84%
rename from scripts/build-deploy-netlify.sh
rename to scripts/deploy-netlify.sh
index 22cfb7bff20..a5bf197f459 100755
--- a/scripts/build-deploy-netlify.sh
+++ b/scripts/deploy-netlify.sh
@@ -10,19 +10,6 @@ idShort="$(echo "$id" | cut -c 1-8) ($version)"
 latestSiteId="642d9ad4-f002-4104-9309-40ed9cd81a1f"
 stableSiteId="deef7ecf-4c3e-4de0-b6bb-676b02e1c20e"
 
-rm -rf "$root"
-mkdir "$root"
-
-echo "Building netlify for $id"
-
-# redirect / to /demo
-echo "/ /demo" > "$root/_redirects"
-cp -r "./dist" "$root/dist"
-cp -r "./demo" "$root/demo"
-cp -r "./api-docs" "$root/api-docs"
-
-echo "Built netlify."
-
 deploy () {
   siteId=$1
   echo "Deploying netlify to '$siteId'."
@@ -30,7 +17,7 @@ deploy () {
   echo "Deployed netlify to '$siteId'."
 }
 
-echo "Creating site for current commit."
+echo "Creating site for current commit ($id)."
 uuid=$(uuidgen)
 commitSiteName="hls-js-$uuid"
 commitSiteId=$(curl --fail -d "{\"name\":\"$commitSiteName\"}" -H "Content-Type: application/json" -X POST "https://api.netlify.com/api/v1/sites?access_token=$NETLIFY_ACCESS_TOKEN" | jq -r '.site_id')
diff --git a/scripts/travis.sh b/scripts/travis.sh
index c8d33a3f782..16cf51d5be3 100755
--- a/scripts/travis.sh
+++ b/scripts/travis.sh
@@ -30,34 +30,40 @@ elif [ "${TRAVIS_MODE}" = "funcTests" ]; then
 	if [ ${n} = ${maxRetries} ]; then
 		exit 1
 	fi
-elif [ "${TRAVIS_MODE}" = "release" ] || [ "${TRAVIS_MODE}" = "releaseCanary" ]; then
+elif [ "${TRAVIS_MODE}" = "release" ] || [ "${TRAVIS_MODE}" = "releaseCanary" ] || [ "${TRAVIS_MODE}" = "netlifyPr" ]; then
   # update the version
   # make sure everything is fetched https://github.com/travis-ci/travis-ci/issues/3412
   git fetch --unshallow
   node ./scripts/set-package-version.js
   npm run lint
   npm run build
-  npm run test:unit
-  if [[ $(node ./scripts/check-already-published.js) = "not published" ]]; then
-    # write the token to config
-    # see https://docs.npmjs.com/private-modules/ci-server-config
-    echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" >> .npmrc
-    if [ "${TRAVIS_MODE}" = "releaseCanary" ]; then
-      npm publish --tag canary
-      echo "Published canary."
-      curl https://purge.jsdelivr.net/npm/hls.js@canary
-      curl https://purge.jsdelivr.net/npm/hls.js@canary/dist/hls-demo.js
-      echo "Cleared jsdelivr cache."
-    elif [ "${TRAVIS_MODE}" = "release" ]; then
-      npm publish
-      curl https://purge.jsdelivr.net/npm/hls.js@latest
-      echo "Published."
+  if [ "${TRAVIS_MODE}" != "netlifyPr" ]; then
+    npm run test:unit
+    if [[ $(node ./scripts/check-already-published.js) = "not published" ]]; then
+      # write the token to config
+      # see https://docs.npmjs.com/private-modules/ci-server-config
+      echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" >> .npmrc
+      if [ "${TRAVIS_MODE}" = "releaseCanary" ]; then
+        npm publish --tag canary
+        echo "Published canary."
+        curl https://purge.jsdelivr.net/npm/hls.js@canary
+        curl https://purge.jsdelivr.net/npm/hls.js@canary/dist/hls-demo.js
+        echo "Cleared jsdelivr cache."
+      elif [ "${TRAVIS_MODE}" = "release" ]; then
+        npm publish
+        curl https://purge.jsdelivr.net/npm/hls.js@latest
+        echo "Published."
+      fi
+    else
+      echo "Already published."
     fi
-  else
-    echo "Already published."
   fi
   npm run docs
-  ./scripts/build-deploy-netlify.sh
+
+  ./scripts/build-netlify.sh
+  if [ "${TRAVIS_MODE}" != "netlifyPr" ]; then
+    ./scripts/deploy-netlify.sh
+  fi
 else
 	echo "Unknown travis mode: ${TRAVIS_MODE}" 1>&2
 	exit 1

From e5a3a78cc58c14728fc13fd2f494f589ceae4280 Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tom.jenkinson@soundcloud.com>
Date: Sat, 26 Jan 2019 18:08:41 +0100
Subject: [PATCH 23/59] check if repo is shallow before fetching

because on netlify it clones the whole thing
---
 scripts/travis.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/travis.sh b/scripts/travis.sh
index 16cf51d5be3..a9358c1c722 100755
--- a/scripts/travis.sh
+++ b/scripts/travis.sh
@@ -32,8 +32,10 @@ elif [ "${TRAVIS_MODE}" = "funcTests" ]; then
 	fi
 elif [ "${TRAVIS_MODE}" = "release" ] || [ "${TRAVIS_MODE}" = "releaseCanary" ] || [ "${TRAVIS_MODE}" = "netlifyPr" ]; then
   # update the version
-  # make sure everything is fetched https://github.com/travis-ci/travis-ci/issues/3412
-  git fetch --unshallow
+  if [[ $(git rev-parse --is-shallow-repository) = "true" ]]; then
+    # make sure everything is fetched https://github.com/travis-ci/travis-ci/issues/3412
+    git fetch --unshallow
+  fi
   node ./scripts/set-package-version.js
   npm run lint
   npm run build

From 35c4553e8fbe1128b04da820b974cd2ad8c29332 Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tom.jenkinson@soundcloud.com>
Date: Sat, 26 Jan 2019 18:27:06 +0100
Subject: [PATCH 24/59] handle 'netlifyPr' in set-package-version

---
 scripts/set-package-version.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/set-package-version.js b/scripts/set-package-version.js
index 6eb8835a547..49f9a019a3d 100755
--- a/scripts/set-package-version.js
+++ b/scripts/set-package-version.js
@@ -17,7 +17,7 @@ try {
     }
     // remove v
     newVersion = tag.substring(1);
-  } else if (TRAVIS_MODE === 'releaseCanary') {
+  } else if (TRAVIS_MODE === 'releaseCanary' || TRAVIS_MODE === 'netlifyPr') {
     // bump patch in version from latest git tag
     let currentVersion = getLatestVersionTag();
     if (!VALID_VERSION_REGEX.test(currentVersion)) {
@@ -34,7 +34,7 @@ try {
     if (!matched) {
       throw new Error('Error calculating version.');
     }
-    newVersion += '-canary.' + getCommitNum();
+    newVersion += `-${TRAVIS_MODE === 'netlifyPr' ? 'pr' : 'canary'}.${getCommitNum()}`;
   } else {
     throw new Error('Unsupported travis mode: ' + TRAVIS_MODE);
   }

From a8f99c4e0168f8cbe5816b609cf52e633297e6d0 Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tom.jenkinson@soundcloud.com>
Date: Sat, 26 Jan 2019 18:28:24 +0100
Subject: [PATCH 25/59] tabs => spaces

---
 scripts/travis.sh | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/scripts/travis.sh b/scripts/travis.sh
index a9358c1c722..c31942be9e6 100755
--- a/scripts/travis.sh
+++ b/scripts/travis.sh
@@ -11,25 +11,25 @@ if [ "${TRAVIS_MODE}" = "build" ]; then
   # see https://github.com/video-dev/hls.js/pull/1642
   node -e 'require("./" + require("./package.json").main)'
 elif [ "${TRAVIS_MODE}" = "unitTests" ]; then
-	npm run test:unit
+  npm run test:unit
 elif [ "${TRAVIS_MODE}" = "funcTests" ]; then
-	npm run build
-	n=0
-	maxRetries=1
-	until [ $n -ge ${maxRetries} ]
-	do
-		if [ $n -gt 0 ]; then
-			echo "Retrying... Attempt: $((n+1))"
-			delay=$((n*60))
-			echo "Waiting ${delay} seconds..."
-			sleep $delay
-		fi
-		npm run test:func && break
-		n=$[$n+1]
-	done
-	if [ ${n} = ${maxRetries} ]; then
-		exit 1
-	fi
+  npm run build
+  n=0
+  maxRetries=1
+  until [ $n -ge ${maxRetries} ]
+  do
+    if [ $n -gt 0 ]; then
+      echo "Retrying... Attempt: $((n+1))"
+      delay=$((n*60))
+      echo "Waiting ${delay} seconds..."
+      sleep $delay
+    fi
+    npm run test:func && break
+    n=$[$n+1]
+  done
+  if [ ${n} = ${maxRetries} ]; then
+    exit 1
+  fi
 elif [ "${TRAVIS_MODE}" = "release" ] || [ "${TRAVIS_MODE}" = "releaseCanary" ] || [ "${TRAVIS_MODE}" = "netlifyPr" ]; then
   # update the version
   if [[ $(git rev-parse --is-shallow-repository) = "true" ]]; then
@@ -67,6 +67,6 @@ elif [ "${TRAVIS_MODE}" = "release" ] || [ "${TRAVIS_MODE}" = "releaseCanary" ]
     ./scripts/deploy-netlify.sh
   fi
 else
-	echo "Unknown travis mode: ${TRAVIS_MODE}" 1>&2
-	exit 1
+  echo "Unknown travis mode: ${TRAVIS_MODE}" 1>&2
+  exit 1
 fi

From f69bf3e473daa0943b60192ad3af0cf7808be867 Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tom.jenkinson@soundcloud.com>
Date: Sun, 27 Jan 2019 00:08:49 +0100
Subject: [PATCH 26/59] add commit to version when PR

---
 scripts/set-package-version.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/scripts/set-package-version.js b/scripts/set-package-version.js
index 49f9a019a3d..40b9a09cdb8 100755
--- a/scripts/set-package-version.js
+++ b/scripts/set-package-version.js
@@ -34,7 +34,11 @@ try {
     if (!matched) {
       throw new Error('Error calculating version.');
     }
-    newVersion += `-${TRAVIS_MODE === 'netlifyPr' ? 'pr' : 'canary'}.${getCommitNum()}`;
+    if (TRAVIS_MODE === 'netlifyPr') {
+      newVersion += `-pr.${getCommitHash().substr(0, 8)}`;
+    } else {
+      newVersion += `-canary.${getCommitNum()}`;
+    }
   } else {
     throw new Error('Unsupported travis mode: ' + TRAVIS_MODE);
   }
@@ -52,6 +56,10 @@ function getCommitNum() {
   return parseInt(require('child_process').execSync('git rev-list --count HEAD').toString(), 10);
 }
 
+function getCommitHash() {
+  return require('child_process').execSync('git rev-parse HEAD').toString();
+}
+
 function getLatestVersionTag() {
   return require('child_process').execSync('git describe --abbrev=0 --match="v*"').toString().trim();
 }

From e2e71c7128dd706082d16470b655240798a1fc6c Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tom.jenkinson@soundcloud.com>
Date: Sun, 27 Jan 2019 11:13:18 +0100
Subject: [PATCH 27/59] always trim command output

---
 scripts/set-package-version.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/scripts/set-package-version.js b/scripts/set-package-version.js
index 40b9a09cdb8..521ff28de30 100755
--- a/scripts/set-package-version.js
+++ b/scripts/set-package-version.js
@@ -53,13 +53,17 @@ try {
 process.exit(0);
 
 function getCommitNum() {
-  return parseInt(require('child_process').execSync('git rev-list --count HEAD').toString(), 10);
+  return parseInt(exec('git rev-list --count HEAD'), 10);
 }
 
 function getCommitHash() {
-  return require('child_process').execSync('git rev-parse HEAD').toString();
+  return exec('git rev-parse HEAD');
 }
 
 function getLatestVersionTag() {
-  return require('child_process').execSync('git describe --abbrev=0 --match="v*"').toString().trim();
+  return exec('git describe --abbrev=0 --match="v*"');
+}
+
+function exec(cmd) {
+  return require('child_process').execSync(cmd).toString().trim();
 }

From 64f13c45868776754400f8249f98a6d713a6d6d5 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 00:40:02 -0400
Subject: [PATCH 28/59] Update Fragment and LevelKey to typescript.

---
 src/loader/fragment.js  | 150 -----------------------------------
 src/loader/fragment.ts  | 171 ++++++++++++++++++++++++++++++++++++++++
 src/loader/level-key.js |  18 -----
 src/loader/level-key.ts |  25 ++++++
 4 files changed, 196 insertions(+), 168 deletions(-)
 delete mode 100644 src/loader/fragment.js
 create mode 100644 src/loader/fragment.ts
 delete mode 100644 src/loader/level-key.js
 create mode 100644 src/loader/level-key.ts

diff --git a/src/loader/fragment.js b/src/loader/fragment.js
deleted file mode 100644
index ef898c50236..00000000000
--- a/src/loader/fragment.js
+++ /dev/null
@@ -1,150 +0,0 @@
-
-import * as URLToolkit from 'url-toolkit';
-
-import LevelKey from './level-key';
-
-export default class Fragment {
-  constructor () {
-    this._url = null;
-    this._byteRange = null;
-    this._decryptdata = null;
-    this.tagList = [];
-    this.programDateTime = null;
-    this.rawProgramDateTime = null;
-
-    // Holds the types of data this fragment supports
-    this._elementaryStreams = {
-      [Fragment.ElementaryStreamTypes.AUDIO]: false,
-      [Fragment.ElementaryStreamTypes.VIDEO]: false
-    };
-  }
-
-  /**
-   * `type` property for this._elementaryStreams
-   *
-   * @enum
-   */
-  static get ElementaryStreamTypes () {
-    return {
-      AUDIO: 'audio',
-      VIDEO: 'video'
-    };
-  }
-
-  get url () {
-    if (!this._url && this.relurl) {
-      this._url = URLToolkit.buildAbsoluteURL(this.baseurl, this.relurl, { alwaysNormalize: true });
-    }
-
-    return this._url;
-  }
-
-  set url (value) {
-    this._url = value;
-  }
-
-  get byteRange () {
-    if (!this._byteRange && !this.rawByteRange) {
-      return [];
-    }
-
-    if (this._byteRange) {
-      return this._byteRange;
-    }
-
-    let byteRange = [];
-    if (this.rawByteRange) {
-      const params = this.rawByteRange.split('@', 2);
-      if (params.length === 1) {
-        const lastByteRangeEndOffset = this.lastByteRangeEndOffset;
-        byteRange[0] = lastByteRangeEndOffset || 0;
-      } else {
-        byteRange[0] = parseInt(params[1]);
-      }
-      byteRange[1] = parseInt(params[0]) + byteRange[0];
-      this._byteRange = byteRange;
-    }
-    return byteRange;
-  }
-
-  /**
-   * @type {number}
-   */
-  get byteRangeStartOffset () {
-    return this.byteRange[0];
-  }
-
-  get byteRangeEndOffset () {
-    return this.byteRange[1];
-  }
-
-  get decryptdata () {
-    if (!this._decryptdata) {
-      this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, this.sn);
-    }
-
-    return this._decryptdata;
-  }
-
-  get endProgramDateTime () {
-    if (!Number.isFinite(this.programDateTime)) {
-      return null;
-    }
-
-    let duration = !Number.isFinite(this.duration) ? 0 : this.duration;
-
-    return this.programDateTime + (duration * 1000);
-  }
-
-  get encrypted () {
-    return !!((this.decryptdata && this.decryptdata.uri !== null) && (this.decryptdata.key === null));
-  }
-
-  /**
-   * @param {ElementaryStreamType} type
-   */
-  addElementaryStream (type) {
-    this._elementaryStreams[type] = true;
-  }
-
-  /**
-   * @param {ElementaryStreamType} type
-   */
-  hasElementaryStream (type) {
-    return this._elementaryStreams[type] === true;
-  }
-
-  /**
-   * Utility method for parseLevelPlaylist to create an initialization vector for a given segment
-   * @returns {Uint8Array}
-   */
-  createInitializationVector (segmentNumber) {
-    let uint8View = new Uint8Array(16);
-
-    for (let i = 12; i < 16; i++) {
-      uint8View[i] = (segmentNumber >> 8 * (15 - i)) & 0xff;
-    }
-
-    return uint8View;
-  }
-
-  /**
-   * Utility method for parseLevelPlaylist to get a fragment's decryption data from the currently parsed encryption key data
-   * @param levelkey - a playlist's encryption info
-   * @param segmentNumber - the fragment's segment number
-   * @returns {*} - an object to be applied as a fragment's decryptdata
-   */
-  fragmentDecryptdataFromLevelkey (levelkey, segmentNumber) {
-    let decryptdata = levelkey;
-
-    if (levelkey && levelkey.method && levelkey.uri && !levelkey.iv) {
-      decryptdata = new LevelKey();
-      decryptdata.method = levelkey.method;
-      decryptdata.baseuri = levelkey.baseuri;
-      decryptdata.reluri = levelkey.reluri;
-      decryptdata.iv = this.createInitializationVector(segmentNumber);
-    }
-
-    return decryptdata;
-  }
-}
diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
new file mode 100644
index 00000000000..208a23013e1
--- /dev/null
+++ b/src/loader/fragment.ts
@@ -0,0 +1,171 @@
+
+import { buildAbsoluteURL } from 'url-toolkit';
+import { logger } from '../utils/logger';
+import LevelKey from './level-key';
+
+export enum ElementaryStreamTypes {
+  AUDIO = 'audio',
+  VIDEO = 'video',
+}
+
+export default class Fragment {
+  private _url: string | null = null;
+  private _byteRange: number[] | null = null;
+  private _decryptdata: LevelKey | null = null;
+
+  // Holds the types of data this fragment supports
+  private _elementaryStreams: Record<ElementaryStreamTypes, boolean> = {
+    [ElementaryStreamTypes.AUDIO]: false,
+    [ElementaryStreamTypes.VIDEO]: false
+  };
+
+  public rawProgramDateTime: string | null = null;
+  public programDateTime: number | null = null;
+
+  public tagList: Array<string[]>;
+
+  // TODO: Move at least baseurl to constructor.
+  // Currently we do a two-pass construction as use the Fragment class almost like a object for holding parsing state.
+  // It may make more sense to just use a POJO to keep state during the parsing phase.
+  // Have Fragment be the representation once we have a known state?
+  // Something to think on.
+
+  // relurl is the portion of the URL that comes from inside the playlist.
+  public relurl!: string;
+  // baseurl is the URL to the playlist
+  public baseurl!: string;
+  // EXTINF has to be present for a m3u8 to be considered valid
+  public duration!: number;
+  // sn notates the sequence number for a segment, and if set to a string can be 'initSegment'
+  public sn: number | string = 0;
+  public levelkey?: LevelKey;
+
+  constructor () {
+    this.tagList = [];
+  }
+
+  // parseByteRange converts a EXT-X-BYTERANGE attribute into a two element array
+  parseByteRange (value: string, previousFrag?: Fragment): number[] {
+    const params = value.split('@', 2);
+    const byteRange: number[] = [];
+    if (params.length === 1) {
+      byteRange[0] = previousFrag ? previousFrag.byteRangeEndOffset : 0;
+    } else {
+      byteRange[0] = parseInt(params[1]);
+    }
+    byteRange[1] = parseInt(params[0]) + byteRange[0];
+    this._byteRange = byteRange;
+    return this._byteRange;
+  }
+
+  get url () {
+    if (!this._url && this.relurl) {
+      this._url = buildAbsoluteURL(this.baseurl, this.relurl, { alwaysNormalize: true });
+    }
+
+    return this._url;
+  }
+
+  set url (value) {
+    this._url = value;
+  }
+
+  get byteRange (): number[] {
+    if (!this._byteRange) {
+      return [];
+    }
+
+    return this._byteRange;
+  }
+
+  /**
+   * @type {number}
+   */
+  get byteRangeStartOffset () {
+    return this.byteRange[0];
+  }
+
+  get byteRangeEndOffset () {
+    return this.byteRange[1];
+  }
+
+  get decryptdata (): LevelKey | null {
+    if (!this.levelkey && !this._decryptdata) {
+      return null;
+    }
+
+    if (!this._decryptdata && this.levelkey) {
+      // TODO look for this warning for 'initSegment' sn getting used in decryption IV
+      if (typeof this.sn !== 'number') {
+        logger.warn(`undefined behaviour for sn="${this.sn}"`);
+      }
+      this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, this.sn as number);
+    }
+
+    return this._decryptdata;
+  }
+
+  get endProgramDateTime () {
+    if (!this.programDateTime) {
+      return null;
+    }
+
+    if (!Number.isFinite(this.programDateTime)) {
+      return null;
+    }
+
+    let duration = !Number.isFinite(this.duration) ? 0 : this.duration;
+
+    return this.programDateTime + (duration * 1000);
+  }
+
+  get encrypted () {
+    return !!((this.decryptdata && this.decryptdata.uri !== null) && (this.decryptdata.key === null));
+  }
+
+  /**
+   * @param {ElementaryStreamTypes} type
+   */
+  addElementaryStream (type: ElementaryStreamTypes) {
+    this._elementaryStreams[type] = true;
+  }
+
+  /**
+   * @param {ElementaryStreamTypes} type
+   */
+  hasElementaryStream (type: ElementaryStreamTypes) {
+    return this._elementaryStreams[type] === true;
+  }
+
+  /**
+   * Utility method for parseLevelPlaylist to create an initialization vector for a given segment
+   * @returns {Uint8Array}
+   */
+  createInitializationVector (segmentNumber): Uint8Array {
+    let uint8View = new Uint8Array(16);
+
+    for (let i = 12; i < 16; i++) {
+      uint8View[i] = (segmentNumber >> 8 * (15 - i)) & 0xff;
+    }
+
+    return uint8View;
+  }
+
+  /**
+   * Utility method for parseLevelPlaylist to get a fragment's decryption data from the currently parsed encryption key data
+   * @param levelkey - a playlist's encryption info
+   * @param segmentNumber - the fragment's segment number
+   * @returns {*} - an object to be applied as a fragment's decryptdata
+   */
+  fragmentDecryptdataFromLevelkey (levelkey: LevelKey, segmentNumber: number): LevelKey {
+    let decryptdata = levelkey;
+
+    if (levelkey && levelkey.method && levelkey.uri && !levelkey.iv) {
+      decryptdata = new LevelKey(levelkey.baseuri, levelkey.reluri);
+      decryptdata.method = levelkey.method;
+      decryptdata.iv = this.createInitializationVector(segmentNumber);
+    }
+
+    return decryptdata;
+  }
+}
diff --git a/src/loader/level-key.js b/src/loader/level-key.js
deleted file mode 100644
index 94238f627f1..00000000000
--- a/src/loader/level-key.js
+++ /dev/null
@@ -1,18 +0,0 @@
-import * as URLToolkit from 'url-toolkit';
-
-export default class LevelKey {
-  constructor () {
-    this.method = null;
-    this.key = null;
-    this.iv = null;
-    this._uri = null;
-  }
-
-  get uri () {
-    if (!this._uri && this.reluri) {
-      this._uri = URLToolkit.buildAbsoluteURL(this.baseuri, this.reluri, { alwaysNormalize: true });
-    }
-
-    return this._uri;
-  }
-}
diff --git a/src/loader/level-key.ts b/src/loader/level-key.ts
new file mode 100644
index 00000000000..de29f98b30e
--- /dev/null
+++ b/src/loader/level-key.ts
@@ -0,0 +1,25 @@
+import { buildAbsoluteURL } from 'url-toolkit';
+
+export default class LevelKey {
+  private _uri: string | null = null;
+
+  public baseuri: string;
+  public reluri: string;
+
+  method: string | null = null;
+  key: Uint8Array | null = null;
+  iv: Uint8Array | null = null;
+
+  constructor (baseURI: string, relativeURI: string) {
+    this.baseuri = baseURI;
+    this.reluri = relativeURI;
+  }
+
+  get uri () {
+    if (!this._uri && this.reluri) {
+      this._uri = buildAbsoluteURL(this.baseuri, this.reluri, { alwaysNormalize: true });
+    }
+
+    return this._uri;
+  }
+}

From af437da8460bb4b0c4ba0550926d9cf0dff8cb83 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 00:40:38 -0400
Subject: [PATCH 29/59] Update usage of Fragment and LevelKey.

---
 src/controller/audio-stream-controller.js |  4 ++--
 src/controller/stream-controller.js       |  8 ++++----
 src/loader/fragment.ts                    |  2 +-
 src/loader/m3u8-parser.js                 | 11 +++++------
 src/loader/playlist-loader.js             |  4 ++--
 5 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/src/controller/audio-stream-controller.js b/src/controller/audio-stream-controller.js
index 0a13ce03e6b..f7489cb3561 100644
--- a/src/controller/audio-stream-controller.js
+++ b/src/controller/audio-stream-controller.js
@@ -12,7 +12,7 @@ import { ErrorTypes, ErrorDetails } from '../errors';
 import { logger } from '../utils/logger';
 import { findFragWithCC } from '../utils/discontinuities';
 import { FragmentState } from './fragment-tracker';
-import Fragment from '../loader/fragment';
+import Fragment, { ElementaryStreamTypes } from '../loader/fragment';
 import BaseStreamController, { State } from './base-stream-controller';
 const { performance } = window;
 
@@ -615,7 +615,7 @@ class AudioStreamController extends BaseStreamController {
         data.endDTS = data.startDTS + fragCurrent.duration;
       }
 
-      fragCurrent.addElementaryStream(Fragment.ElementaryStreamTypes.AUDIO);
+      fragCurrent.addElementaryStream(ElementaryStreamTypes.AUDIO);
 
       logger.log(`parsed ${data.type},PTS:[${data.startPTS.toFixed(3)},${data.endPTS.toFixed(3)}],DTS:[${data.startDTS.toFixed(3)}/${data.endDTS.toFixed(3)}],nb:${data.nb}`);
       LevelHelper.updateFragPTSDTS(track.details, fragCurrent, data.startPTS, data.endPTS);
diff --git a/src/controller/stream-controller.js b/src/controller/stream-controller.js
index 3624ae25fbb..5975475c914 100644
--- a/src/controller/stream-controller.js
+++ b/src/controller/stream-controller.js
@@ -7,7 +7,7 @@ import { BufferHelper } from '../utils/buffer-helper';
 import Demuxer from '../demux/demuxer';
 import Event from '../events';
 import { FragmentState } from './fragment-tracker';
-import Fragment from '../loader/fragment';
+import Fragment, { ElementaryStreamTypes } from '../loader/fragment';
 import PlaylistLoader from '../loader/playlist-loader';
 import * as LevelHelper from './level-helper';
 import TimeRanges from '../utils/time-ranges';
@@ -1000,11 +1000,11 @@ class StreamController extends BaseStreamController {
       }
 
       if (data.hasAudio === true) {
-        frag.addElementaryStream(Fragment.ElementaryStreamTypes.AUDIO);
+        frag.addElementaryStream(ElementaryStreamTypes.AUDIO);
       }
 
       if (data.hasVideo === true) {
-        frag.addElementaryStream(Fragment.ElementaryStreamTypes.VIDEO);
+        frag.addElementaryStream(ElementaryStreamTypes.VIDEO);
       }
 
       logger.log(`Parsed ${data.type},PTS:[${data.startPTS.toFixed(3)},${data.endPTS.toFixed(3)}],DTS:[${data.startDTS.toFixed(3)}/${data.endDTS.toFixed(3)}],nb:${data.nb},dropped:${data.dropped || 0}`);
@@ -1305,7 +1305,7 @@ class StreamController extends BaseStreamController {
     const media = this.mediaBuffer ? this.mediaBuffer : this.media;
     if (media) {
       // filter fragments potentially evicted from buffer. this is to avoid memleak on live streams
-      this.fragmentTracker.detectEvictedFragments(Fragment.ElementaryStreamTypes.VIDEO, media.buffered);
+      this.fragmentTracker.detectEvictedFragments(ElementaryStreamTypes.VIDEO, media.buffered);
     }
     // move to IDLE once flush complete. this should trigger new fragment loading
     this.state = State.IDLE;
diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index 208a23013e1..604d6691d85 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -106,7 +106,7 @@ export default class Fragment {
   }
 
   get endProgramDateTime () {
-    if (!this.programDateTime) {
+    if (this.programDateTime === null) {
       return null;
     }
 
diff --git a/src/loader/m3u8-parser.js b/src/loader/m3u8-parser.js
index f499a9edafd..e99239dafa9 100644
--- a/src/loader/m3u8-parser.js
+++ b/src/loader/m3u8-parser.js
@@ -189,12 +189,11 @@ export default class M3U8Parser {
           frag = new Fragment();
         }
       } else if (result[4]) { // X-BYTERANGE
-        frag.rawByteRange = (' ' + result[4]).slice(1);
+        const data = (' ' + result[4]).slice(1);
         if (prevFrag) {
-          const lastByteRangeEndOffset = prevFrag.byteRangeEndOffset;
-          if (lastByteRangeEndOffset) {
-            frag.lastByteRangeEndOffset = lastByteRangeEndOffset;
-          }
+          frag.parseByteRange(data, prevFrag);
+        } else {
+          frag.parseByteRange(data);
         }
       } else if (result[5]) { // PROGRAM-DATE-TIME
         // avoid sliced strings    https://github.com/video-dev/hls.js/issues/939
@@ -276,7 +275,7 @@ export default class M3U8Parser {
         case 'MAP':
           let mapAttrs = new AttrList(value1);
           frag.relurl = mapAttrs.URI;
-          frag.rawByteRange = mapAttrs.BYTERANGE;
+          frag.parseByteRange(mapAttrs.BYTERANGE, prevFrag);
           frag.baseurl = baseurl;
           frag.level = id;
           frag.type = type;
diff --git a/src/loader/playlist-loader.js b/src/loader/playlist-loader.js
index 03ac882720d..ac7ac0f6802 100644
--- a/src/loader/playlist-loader.js
+++ b/src/loader/playlist-loader.js
@@ -407,10 +407,10 @@ class PlaylistLoader extends EventHandler {
       const frag = levelDetails.fragments[index];
 
       if (frag.byteRange.length === 0) {
-        frag.rawByteRange = String(1 + segRefInfo.end - segRefInfo.start) + '@' + String(segRefInfo.start);
+        frag.parseByteRange(String(1 + segRefInfo.end - segRefInfo.start) + '@' + String(segRefInfo.start));
       }
     });
-    levelDetails.initSegment.rawByteRange = String(sidxInfo.moovEndOffset) + '@0';
+    levelDetails.initSegment.parseByteRange(String(sidxInfo.moovEndOffset) + '@0');
   }
 
   _handleManifestParsingError (response, context, reason, networkDetails) {

From 40e81b854389c23a77fbc025d88e9ef82e5267ee Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 01:12:53 -0400
Subject: [PATCH 30/59] Don't pass prevFrag into EXT-X-MAP handling.

---
 src/loader/m3u8-parser.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/loader/m3u8-parser.js b/src/loader/m3u8-parser.js
index e99239dafa9..21903445cfd 100644
--- a/src/loader/m3u8-parser.js
+++ b/src/loader/m3u8-parser.js
@@ -275,7 +275,7 @@ export default class M3U8Parser {
         case 'MAP':
           let mapAttrs = new AttrList(value1);
           frag.relurl = mapAttrs.URI;
-          frag.parseByteRange(mapAttrs.BYTERANGE, prevFrag);
+          frag.parseByteRange(mapAttrs.BYTERANGE);
           frag.baseurl = baseurl;
           frag.level = id;
           frag.type = type;

From 2a80ff24006cb55bb5e815a90487166919a1b524 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 01:26:27 -0400
Subject: [PATCH 31/59] Add tests for parsing byte range as seperate call.

---
 tests/unit/loader/fragment.js | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/tests/unit/loader/fragment.js b/tests/unit/loader/fragment.js
index c172c264f76..d9b1b75b9ab 100644
--- a/tests/unit/loader/fragment.js
+++ b/tests/unit/loader/fragment.js
@@ -1,12 +1,37 @@
 import Fragment from '../../../src/loader/fragment';
 
 describe('Fragment class tests', function () {
+  /**
+   * @type {Fragment}
+   */
   let frag;
-  describe('endProgramDateTime getter', function () {
-    beforeEach(function () {
-      frag = new Fragment();
+  beforeEach(function () {
+    frag = new Fragment();
+  });
+
+  describe('parseByteRange', function () {
+    it('parses byte range string with length@offset', function () {
+      frag.parseByteRange('1000@10000');
+      expect(frag.byteRangeStartOffset).to.equal(10000);
+      expect(frag.byteRangeEndOffset).to.equal(11000);
+    });
+
+    it('parses byte range with no offset and uses 0 as offset', function () {
+      frag.parseByteRange('5000');
+      expect(frag.byteRangeStartOffset).to.equal(0);
+      expect(frag.byteRangeEndOffset).to.equal(5000);
     });
 
+    it('parses byte range with no offset and uses 0 as offset', function () {
+      const prevFrag = new Fragment();
+      prevFrag.parseByteRange('1000@10000');
+      frag.parseByteRange('5000', prevFrag);
+      expect(frag.byteRangeStartOffset).to.equal(11000);
+      expect(frag.byteRangeEndOffset).to.equal(16000);
+    });
+  });
+
+  describe('endProgramDateTime getter', function () {
     it('computes endPdt when pdt and duration are valid', function () {
       frag.programDateTime = 1000;
       frag.duration = 1;

From b37a351c3f52689d2bd38a680fa88f684054758e Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 16:35:53 -0400
Subject: [PATCH 32/59] Only parse byte range if it exists.

---
 src/loader/m3u8-parser.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/loader/m3u8-parser.js b/src/loader/m3u8-parser.js
index 21903445cfd..4ede889fd34 100644
--- a/src/loader/m3u8-parser.js
+++ b/src/loader/m3u8-parser.js
@@ -275,7 +275,9 @@ export default class M3U8Parser {
         case 'MAP':
           let mapAttrs = new AttrList(value1);
           frag.relurl = mapAttrs.URI;
-          frag.parseByteRange(mapAttrs.BYTERANGE);
+          if (mapAttrs.BYTERANGE) {
+            frag.parseByteRange(mapAttrs.BYTERANGE);
+          }
           frag.baseurl = baseurl;
           frag.level = id;
           frag.type = type;

From a742c301f1000708b1740fd88437a36254a8fbe0 Mon Sep 17 00:00:00 2001
From: Tom Jenkinson <tjenkinson@users.noreply.github.com>
Date: Tue, 29 Jan 2019 17:31:31 -0400
Subject: [PATCH 33/59] Apply suggestions from code review

Co-Authored-By: itsjamie <1956521+itsjamie@users.noreply.github.com>
---
 src/loader/fragment.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index 604d6691d85..e10b8fb4eda 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -37,7 +37,7 @@ export default class Fragment {
   // EXTINF has to be present for a m3u8 to be considered valid
   public duration!: number;
   // sn notates the sequence number for a segment, and if set to a string can be 'initSegment'
-  public sn: number | string = 0;
+  public sn: number | 'initSegment' = 0;
   public levelkey?: LevelKey;
 
   constructor () {

From 2e2cb12e0e1f015c4913e85f64c4b83fb4316006 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 17:36:50 -0400
Subject: [PATCH 34/59] Review changes.

parseByteRange -> setByteRange
- removed it returning the parsed value since its usage was like a setter.
---
 src/loader/fragment.ts        | 5 ++---
 src/loader/level-key.ts       | 7 +++----
 src/loader/m3u8-parser.js     | 6 +++---
 src/loader/playlist-loader.js | 4 ++--
 tests/unit/loader/fragment.js | 8 ++++----
 5 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index e10b8fb4eda..5139cf43c44 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -44,8 +44,8 @@ export default class Fragment {
     this.tagList = [];
   }
 
-  // parseByteRange converts a EXT-X-BYTERANGE attribute into a two element array
-  parseByteRange (value: string, previousFrag?: Fragment): number[] {
+  // setByteRange converts a EXT-X-BYTERANGE attribute into a two element array
+  setByteRange (value: string, previousFrag?: Fragment) {
     const params = value.split('@', 2);
     const byteRange: number[] = [];
     if (params.length === 1) {
@@ -55,7 +55,6 @@ export default class Fragment {
     }
     byteRange[1] = parseInt(params[0]) + byteRange[0];
     this._byteRange = byteRange;
-    return this._byteRange;
   }
 
   get url () {
diff --git a/src/loader/level-key.ts b/src/loader/level-key.ts
index de29f98b30e..f5abc95e79e 100644
--- a/src/loader/level-key.ts
+++ b/src/loader/level-key.ts
@@ -5,10 +5,9 @@ export default class LevelKey {
 
   public baseuri: string;
   public reluri: string;
-
-  method: string | null = null;
-  key: Uint8Array | null = null;
-  iv: Uint8Array | null = null;
+  public method: string | null = null;
+  public key: Uint8Array | null = null;
+  public iv: Uint8Array | null = null;
 
   constructor (baseURI: string, relativeURI: string) {
     this.baseuri = baseURI;
diff --git a/src/loader/m3u8-parser.js b/src/loader/m3u8-parser.js
index 4ede889fd34..943c84a6856 100644
--- a/src/loader/m3u8-parser.js
+++ b/src/loader/m3u8-parser.js
@@ -191,9 +191,9 @@ export default class M3U8Parser {
       } else if (result[4]) { // X-BYTERANGE
         const data = (' ' + result[4]).slice(1);
         if (prevFrag) {
-          frag.parseByteRange(data, prevFrag);
+          frag.setByteRange(data, prevFrag);
         } else {
-          frag.parseByteRange(data);
+          frag.setByteRange(data);
         }
       } else if (result[5]) { // PROGRAM-DATE-TIME
         // avoid sliced strings    https://github.com/video-dev/hls.js/issues/939
@@ -276,7 +276,7 @@ export default class M3U8Parser {
           let mapAttrs = new AttrList(value1);
           frag.relurl = mapAttrs.URI;
           if (mapAttrs.BYTERANGE) {
-            frag.parseByteRange(mapAttrs.BYTERANGE);
+            frag.setByteRange(mapAttrs.BYTERANGE);
           }
           frag.baseurl = baseurl;
           frag.level = id;
diff --git a/src/loader/playlist-loader.js b/src/loader/playlist-loader.js
index ac7ac0f6802..7bcc111d005 100644
--- a/src/loader/playlist-loader.js
+++ b/src/loader/playlist-loader.js
@@ -407,10 +407,10 @@ class PlaylistLoader extends EventHandler {
       const frag = levelDetails.fragments[index];
 
       if (frag.byteRange.length === 0) {
-        frag.parseByteRange(String(1 + segRefInfo.end - segRefInfo.start) + '@' + String(segRefInfo.start));
+        frag.setByteRange(String(1 + segRefInfo.end - segRefInfo.start) + '@' + String(segRefInfo.start));
       }
     });
-    levelDetails.initSegment.parseByteRange(String(sidxInfo.moovEndOffset) + '@0');
+    levelDetails.initSegment.setByteRange(String(sidxInfo.moovEndOffset) + '@0');
   }
 
   _handleManifestParsingError (response, context, reason, networkDetails) {
diff --git a/tests/unit/loader/fragment.js b/tests/unit/loader/fragment.js
index d9b1b75b9ab..36549505cc9 100644
--- a/tests/unit/loader/fragment.js
+++ b/tests/unit/loader/fragment.js
@@ -9,20 +9,20 @@ describe('Fragment class tests', function () {
     frag = new Fragment();
   });
 
-  describe('parseByteRange', function () {
-    it('parses byte range string with length@offset', function () {
+  describe('setByteRange', function () {
+    it('set byte range with length@offset', function () {
       frag.parseByteRange('1000@10000');
       expect(frag.byteRangeStartOffset).to.equal(10000);
       expect(frag.byteRangeEndOffset).to.equal(11000);
     });
 
-    it('parses byte range with no offset and uses 0 as offset', function () {
+    it('set byte range with no offset and uses 0 as offset', function () {
       frag.parseByteRange('5000');
       expect(frag.byteRangeStartOffset).to.equal(0);
       expect(frag.byteRangeEndOffset).to.equal(5000);
     });
 
-    it('parses byte range with no offset and uses 0 as offset', function () {
+    it('set byte range with no offset and uses 0 as offset', function () {
       const prevFrag = new Fragment();
       prevFrag.parseByteRange('1000@10000');
       frag.parseByteRange('5000', prevFrag);

From c8b00488703a3894e7f60f1ba8aa15318eee9c20 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 17:43:34 -0400
Subject: [PATCH 35/59] Review comments pt.2

---
 src/loader/fragment.ts | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index 5139cf43c44..e03539467b8 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -21,8 +21,7 @@ export default class Fragment {
 
   public rawProgramDateTime: string | null = null;
   public programDateTime: number | null = null;
-
-  public tagList: Array<string[]>;
+  public tagList: Array<string[]> = [];
 
   // TODO: Move at least baseurl to constructor.
   // Currently we do a two-pass construction as use the Fragment class almost like a object for holding parsing state.
@@ -38,12 +37,11 @@ export default class Fragment {
   public duration!: number;
   // sn notates the sequence number for a segment, and if set to a string can be 'initSegment'
   public sn: number | 'initSegment' = 0;
+  // levelkey is the EXT-X-KEY that applies to this segment for decryption
+  // core difference from the private field _decryptdata is the lack of the initialized IV
+  // _decryptdata will set the IV for this segment based on the segment number in the fragment
   public levelkey?: LevelKey;
 
-  constructor () {
-    this.tagList = [];
-  }
-
   // setByteRange converts a EXT-X-BYTERANGE attribute into a two element array
   setByteRange (value: string, previousFrag?: Fragment) {
     const params = value.split('@', 2);
@@ -96,7 +94,7 @@ export default class Fragment {
     if (!this._decryptdata && this.levelkey) {
       // TODO look for this warning for 'initSegment' sn getting used in decryption IV
       if (typeof this.sn !== 'number') {
-        logger.warn(`undefined behaviour for sn="${this.sn}"`);
+        logger.warn(`undefined behaviour for sn="${this.sn}" in IV generation`);
       }
       this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, this.sn as number);
     }
@@ -140,7 +138,7 @@ export default class Fragment {
    * Utility method for parseLevelPlaylist to create an initialization vector for a given segment
    * @returns {Uint8Array}
    */
-  createInitializationVector (segmentNumber): Uint8Array {
+  createInitializationVector (segmentNumber: number): Uint8Array {
     let uint8View = new Uint8Array(16);
 
     for (let i = 12; i < 16; i++) {

From 150d1e62b38e065109f5db3f45057686020a70e4 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 17:49:08 -0400
Subject: [PATCH 36/59] Change tests to call setByteRange

---
 tests/unit/loader/fragment.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/unit/loader/fragment.js b/tests/unit/loader/fragment.js
index 36549505cc9..41c359aa9c6 100644
--- a/tests/unit/loader/fragment.js
+++ b/tests/unit/loader/fragment.js
@@ -11,21 +11,21 @@ describe('Fragment class tests', function () {
 
   describe('setByteRange', function () {
     it('set byte range with length@offset', function () {
-      frag.parseByteRange('1000@10000');
+      frag.setByteRange('1000@10000');
       expect(frag.byteRangeStartOffset).to.equal(10000);
       expect(frag.byteRangeEndOffset).to.equal(11000);
     });
 
     it('set byte range with no offset and uses 0 as offset', function () {
-      frag.parseByteRange('5000');
+      frag.setByteRange('5000');
       expect(frag.byteRangeStartOffset).to.equal(0);
       expect(frag.byteRangeEndOffset).to.equal(5000);
     });
 
     it('set byte range with no offset and uses 0 as offset', function () {
       const prevFrag = new Fragment();
-      prevFrag.parseByteRange('1000@10000');
-      frag.parseByteRange('5000', prevFrag);
+      prevFrag.setByteRange('1000@10000');
+      frag.setByteRange('5000', prevFrag);
       expect(frag.byteRangeStartOffset).to.equal(11000);
       expect(frag.byteRangeEndOffset).to.equal(16000);
     });

From 9329b554c04216f4d8c9021d13d9506959b4a8c7 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Tue, 29 Jan 2019 23:09:51 -0400
Subject: [PATCH 37/59] Explicit handling of 'initSegment' conversion for
 bitwise operation.

---
 src/loader/fragment.ts | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index e03539467b8..ea16d8b8004 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -92,11 +92,18 @@ export default class Fragment {
     }
 
     if (!this._decryptdata && this.levelkey) {
-      // TODO look for this warning for 'initSegment' sn getting used in decryption IV
-      if (typeof this.sn !== 'number') {
-        logger.warn(`undefined behaviour for sn="${this.sn}" in IV generation`);
+      let sn = this.sn;
+      if (typeof sn !== 'number') {
+        /*
+        Be converted to a Number.
+        'initSegment' will become NaN.
+        NaN, which when converted through ToInt32() -> +0.
+        ---
+        Explicitly set sn to expected value for 'initSegment' values for IV generation.
+        */
+        sn = 0;
       }
-      this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, this.sn as number);
+      this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, sn);
     }
 
     return this._decryptdata;

From a0c28c52771393bf50f871dd3be8690790fd757d Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <1956521+itsjamie@users.noreply.github.com>
Date: Wed, 30 Jan 2019 13:11:40 -0400
Subject: [PATCH 38/59] Fix lint warnings in m3u8-parser.js in prep for TS
 conversion. (#2106)

---
 src/loader/m3u8-parser.js | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/src/loader/m3u8-parser.js b/src/loader/m3u8-parser.js
index f499a9edafd..ab2b832221f 100644
--- a/src/loader/m3u8-parser.js
+++ b/src/loader/m3u8-parser.js
@@ -48,7 +48,8 @@ export default class M3U8Parser {
   }
 
   static convertAVC1ToAVCOTI (codec) {
-    let result, avcdata = codec.split('.');
+    let avcdata = codec.split('.');
+    let result;
     if (avcdata.length > 2) {
       result = avcdata.shift() + '.';
       result += parseInt(avcdata.shift()).toString(16);
@@ -64,7 +65,7 @@ export default class M3U8Parser {
   }
 
   static parseMasterPlaylist (string, baseurl) {
-    let levels = [], result;
+    let levels = [];
     MASTER_PLAYLIST_REGEX.lastIndex = 0;
 
     function setCodecs (codecs, level) {
@@ -84,6 +85,7 @@ export default class M3U8Parser {
       level.unknownCodecs = codecs;
     }
 
+    let result;
     while ((result = MASTER_PLAYLIST_REGEX.exec(string)) != null) {
       const level = {};
 
@@ -206,7 +208,7 @@ export default class M3U8Parser {
       } else {
         result = result[0].match(LEVEL_PLAYLIST_REGEX_SLOW);
         for (i = 1; i < result.length; i++) {
-          if (result[i] !== undefined) {
+          if (typeof result[i] !== 'undefined') {
             break;
           }
         }
@@ -243,13 +245,14 @@ export default class M3U8Parser {
         case 'DISCONTINUITY-SEQ':
           cc = parseInt(value1);
           break;
-        case 'KEY':
+        case 'KEY': {
           // https://tools.ietf.org/html/draft-pantos-http-live-streaming-08#section-3.4.4
-          var decryptparams = value1;
-          var keyAttrs = new AttrList(decryptparams);
-          var decryptmethod = keyAttrs.enumeratedString('METHOD'),
-            decrypturi = keyAttrs.URI,
-            decryptiv = keyAttrs.hexadecimalInteger('IV');
+          const decryptparams = value1;
+          const keyAttrs = new AttrList(decryptparams);
+          const decryptmethod = keyAttrs.enumeratedString('METHOD');
+          const decrypturi = keyAttrs.URI;
+          const decryptiv = keyAttrs.hexadecimalInteger('IV');
+
           if (decryptmethod) {
             levelkey = new LevelKey();
             if ((decrypturi) && (['AES-128', 'SAMPLE-AES', 'SAMPLE-AES-CENC'].indexOf(decryptmethod) >= 0)) {
@@ -263,18 +266,18 @@ export default class M3U8Parser {
             }
           }
           break;
-        case 'START':
-          let startParams = value1;
-          let startAttrs = new AttrList(startParams);
-          let startTimeOffset = startAttrs.decimalFloatingPoint('TIME-OFFSET');
+        }
+        case 'START': {
+          const startAttrs = new AttrList(value1);
+          const startTimeOffset = startAttrs.decimalFloatingPoint('TIME-OFFSET');
           // TIME-OFFSET can be 0
           if (Number.isFinite(startTimeOffset)) {
             level.startTimeOffset = startTimeOffset;
           }
-
           break;
-        case 'MAP':
-          let mapAttrs = new AttrList(value1);
+        }
+        case 'MAP': {
+          const mapAttrs = new AttrList(value1);
           frag.relurl = mapAttrs.URI;
           frag.rawByteRange = mapAttrs.BYTERANGE;
           frag.baseurl = baseurl;
@@ -285,6 +288,7 @@ export default class M3U8Parser {
           frag = new Fragment();
           frag.rawProgramDateTime = level.initSegment.rawProgramDateTime;
           break;
+        }
         default:
           logger.warn(`line parsed but not handled: ${result}`);
           break;

From 5b6d7fe1fe22621051bf802200660fff559db3c6 Mon Sep 17 00:00:00 2001
From: Alexey Gusev <mad.gooze@gmail.com>
Date: Wed, 30 Jan 2019 20:30:02 +0300
Subject: [PATCH 39/59] fix console null reference in logger (in webworkers)
 (#2095)

Fix null reference in logger when console is not available
---
 src/utils/logger.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/utils/logger.js b/src/utils/logger.js
index 6ca0e0a51be..83542df366b 100644
--- a/src/utils/logger.js
+++ b/src/utils/logger.js
@@ -50,7 +50,8 @@ function exportLoggerFunctions (debugConfig, ...functions) {
 }
 
 export var enableLogs = function (debugConfig) {
-  if (debugConfig === true || typeof debugConfig === 'object') {
+  // check that console is available
+  if ((global.console && debugConfig === true) || typeof debugConfig === 'object') {
     exportLoggerFunctions(debugConfig,
       // Remove out from list here to hard-disable a log-level
       // 'trace',

From ec1700d0b5519309f9fa2d7c95295acc5ef39b7d Mon Sep 17 00:00:00 2001
From: Michael Cunningham <michael.cunningham@live.ca>
Date: Wed, 30 Jan 2019 13:32:37 -0400
Subject: [PATCH 40/59] (misc) Adding ace editor to demo to enable advanced
 customization (#2077)

---
 demo/index.html | 143 ++++++++++++++++++++------------------------
 demo/main.js    | 152 ++++++++++++++++++++++++++++++++---------------
 demo/style.css  | 155 +++++++++++++++++++++++++++++++++++++-----------
 3 files changed, 290 insertions(+), 160 deletions(-)

diff --git a/demo/index.html b/demo/index.html
index d1d6a5b8989..32cbab23f54 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -1,22 +1,16 @@
 <!DOCTYPE html>
 <html>
-
   <head>
-
-    <meta charset="utf-8"/>
-
+    <meta charset="utf-8">
     <title>hls.js demo</title>
-
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
-
     <link rel="stylesheet" href="style.css">
-
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.3/FileSaver.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/ace/1.4.2/ace.js"></script>
   </head>
-
   <body>
     <div class="header-container">
       <header class="wrapper clearfix">
@@ -49,86 +43,77 @@ <h3>
         </p>
       </header>
       <div id="controls">
-
-        <div id="customButtons"></div>
-
-        <select id="streamSelect" class="innerControls">
-          <option value="" selected>Select a test-stream from drop-down menu. Or enter custom URL below</option>
-        </select>
-
-        <input id="streamURL" class="innerControls" type=text value=""/>
-
-        <label class="innerControls">
-          Enable streaming:
-          <input id="enableStreaming" type=checkbox checked/>
-        </label>
-
-        <label class="innerControls">
-          Auto-recover media-errors:
-          <input id="autoRecoverError" type=checkbox checked/>
-        </label>
-
-        <label class="innerControls">
-          Enable worker for transmuxing:
-          <input id="enableWorker" type=checkbox checked/>
-        </label>
-
-        <label class="innerControls">
-          Dump transmuxed fMP4 data:
-          <input id="dumpfMP4" type=checkbox unchecked/>
-        </label>
-
-        <label class="innerControls">
-          Widevine DRM license-server URL:
-          <input id="widevineLicenseUrl" style="width: 50%"/>
-        </label>
-
-        <label class="innerControls">
-          Level-cap'ing (max limit):
-          <input id="levelCapping" style="width: 8em" type=number/>
-        </label>
-
-        <label class="innerControls">
-          Default audio-codec:
-          <input style="width: 8em" id="defaultAudioCodec"/>
-        </label>
-
-        <label class="innerControls">
-          Metrics history (max limit, -1 is unlimited):
-          <input id="limitMetrics" style="width: 8em" type=number/>
-        </label>
-
-        <label class="innerControls">
-          Player size:
-          <select id="videoSize" style="float:right;">
-            <option value="240">Tiny (240p)</option>
-            <option value="384">Small (384p)</option>
-            <option value="480">Medium (480p)</option>
-            <option value="720" selected>Large (720p)</option>
-            <option value="1080">Huge (1080p)</option>
+        <div class="demo-controls-wrapper">
+          <select id="streamSelect" class="innerControls">
+            <option value="" selected>Select a test-stream from drop-down menu. Or enter custom URL below</option>
           </select>
-        </label>
 
-        <label class="innerControls">
-          Current video-resolution:
-          <span id="currentResolution">/</span>
-        </label>
+          <input id="streamURL" class="innerControls" type=text value=""/>
+
+          <label class="innerControls">
+            Enable streaming:
+            <input id="enableStreaming" type=checkbox checked/>
+          </label>
+
+          <label class="innerControls">
+            Auto-recover media-errors:
+            <input id="autoRecoverError" type=checkbox checked/>
+          </label>
+
+          <label class="innerControls">
+            Dump transmuxed fMP4 data:
+            <input id="dumpfMP4" type=checkbox unchecked/>
+          </label>
+
+          <label class="innerControls">
+            Metrics history (max limit, -1 is unlimited):
+            <input id="limitMetrics" style="width: 8em" type=number/>
+          </label>
+
+          <label class="innerControls">
+            Player size:
+            <select id="videoSize" style="float:right;">
+              <option value="240">Tiny (240p)</option>
+              <option value="384">Small (384p)</option>
+              <option value="480">Medium (480p)</option>
+              <option value="720" selected>Large (720p)</option>
+              <option value="1080">Huge (1080p)</option>
+            </select>
+          </label>
+
+          <label class="innerControls">
+            Current video-resolution:
+            <span id="currentResolution">/</span>
+          </label>
+
+          <label class="innerControls">
+            Permalink:
+            <span id="StreamPermalink"></span>
+          </label>
+        </div>
 
-        <label class="innerControls">
-          Permalink:&nbsp;
-          <span id="StreamPermalink" style="width: 50%"></span>
-        </label>
+        <div class="config-editor-wrapper">
+          <div class="config-editor-container">
+              <div id="config-editor">
+                Loading...
+              </div>
+          </div>
+          <div class="config-editor-commands">
+            <label for="config-persistence">
+                Persist
+                <input name="config-persistence" id="configPersistence" type="checkbox">
+            </label>
+            <button name="config-apply" onclick="applyConfigEditorValue()">Apply</button>
+          </div>
+        </div>
 
       </div>
 
       <video id="video" controls autoplay class="videoCentered"></video>
-
       <br>
-
       <canvas id="bufferedCanvas" height="15" class="videoCentered" onclick="onClickBufferedRange(event);"></canvas>
-
-      <br><br>
-
+      <br>
+      <br>
       <label class="center">Status:</label>
       <pre id="statusOut" class="center" style="white-space: pre-wrap;"></pre>
 
diff --git a/demo/main.js b/demo/main.js
index 95bf23aa546..29432071819 100644
--- a/demo/main.js
+++ b/demo/main.js
@@ -1,5 +1,10 @@
 import {sortObject, copyTextToClipboard} from './demo-utils'
 
+const STORAGE_KEYS = {
+  Editor_Persistence: 'hlsjs:config-editor-persist',
+  Hls_Config        : 'hlsjs:config'
+};
+
 const testStreams = require('../tests/test-streams');
 const defaultTestStreamUrl = testStreams['bbb'].url;
 const sourceURL = decodeURIComponent(getURLParam('src', defaultTestStreamUrl))
@@ -11,13 +16,15 @@ if (demoConfig) {
   demoConfig = {}
 }
 
+const hlsjsDefaults = {
+  debug: true,
+  enableWorker: true
+};
+
 let enableStreaming = getDemoConfigPropOrDefault('enableStreaming', true);
 let autoRecoverError = getDemoConfigPropOrDefault('autoRecoverError', true);
-let enableWorker = getDemoConfigPropOrDefault('enableWorker', true);
 let levelCapping = getDemoConfigPropOrDefault('levelCapping', -1);
 let limitMetrics = getDemoConfigPropOrDefault('limitMetrics', -1);
-let defaultAudioCodec = getDemoConfigPropOrDefault('defaultAudioCodec', undefined);
-let widevineLicenseUrl = getDemoConfigPropOrDefault('widevineLicenseURL', undefined);
 let dumpfMP4 = getDemoConfigPropOrDefault('dumpfMP4', false);
 
 let bufferingIdx = -1;
@@ -35,8 +42,12 @@ let events;
 let stats;
 let tracks;
 let fmp4Data;
+let configPersistenceEnabled = false;
+let configEditor = null;
 
 $(document).ready(function() {
+  setupConfigEditor();
+
   Object.keys(testStreams).forEach((key) => {
     const stream = testStreams[key];
     const option = new Option(stream.description, key);
@@ -70,11 +81,6 @@ $(document).ready(function() {
     onDemoConfigChanged();
   });
 
-  $('#enableWorker').click(function() {
-    enableWorker = this.checked;
-    onDemoConfigChanged();
-  });
-
   $('#dumpfMP4').click(function() {
     dumpfMP4 = this.checked;
     onDemoConfigChanged();
@@ -90,18 +96,11 @@ $(document).ready(function() {
     onDemoConfigChanged();
   });
 
-  $('#defaultAudioCodec').change(function() {
-    defaultAudioCodec = this.value;
-    onDemoConfigChanged();
-  });
-
   $('#limitMetrics').val(limitMetrics);
   $('#enableStreaming').prop('checked', enableStreaming );
   $('#autoRecoverError').prop('checked', autoRecoverError );
-  $('#enableWorker').prop('checked', enableWorker );
   $('#dumpfMP4').prop('checked', dumpfMP4 );
   $('#levelCapping').val(levelCapping);
-  $('#defaultAudioCodec').val(defaultAudioCodec || 'undefined');
 
   $('h2').append('&nbsp;<a target=_blank href=https://github.com/video-dev/hls.js/releases/tag/v' + Hls.version + '>v' + Hls.version + '</a>');
   $('#currentVersion').html('Hls version:' + Hls.version);
@@ -146,7 +145,7 @@ function setupGlobals() {
   window.createfMP4 = createfMP4;
   window.goToMetricsPermaLink = goToMetricsPermaLink;
   window.toggleTab = toggleTab;
-  window.onDemoConfigChanged = onDemoConfigChanged;
+  window.applyConfigEditorValue = applyConfigEditorValue;
 }
 
 function trimArray( target, limit ) {
@@ -202,29 +201,14 @@ function loadSelectedStream() {
 
   logStatus('Loading ' + url);
 
-  if (widevineLicenseUrl) {
-    widevineLicenseUrl = unescape(widevineLicenseUrl)
-  }
 
-  const hlsConfig = {
-    debug            : true,
-    enableWorker     : enableWorker,
-    defaultAudioCodec: defaultAudioCodec,
-    widevineLicenseUrl: widevineLicenseUrl
-  };
+  // Extending both a demo-specific config and the user config which can override all
+  const hlsConfig = $.extend({}, hlsjsDefaults, getEditorValue({ parse: true }));
 
   if (selectedTestStream && selectedTestStream.config) {
-    Object.assign(hlsConfig, selectedTestStream.config)
-  }
-
-  if (hlsConfig.widevineLicenseUrl) {
-    $('#widevineLicenseUrl').val(hlsConfig.widevineLicenseUrl);
-  }
-
-  widevineLicenseUrl = hlsConfig.widevineLicenseUrl = $('#widevineLicenseUrl').val();
-
-  if (hlsConfig.widevineLicenseUrl) {
-    hlsConfig.emeEnabled = true;
+    console.info('[loadSelectedStream] extending hls config with stream-specific config: ', selectedTestStream.config);
+    $.extend(hlsConfig, selectedTestStream.config);
+    updateConfigEditorValue(hlsConfig);
   }
 
   onDemoConfigChanged();
@@ -943,7 +927,6 @@ function copyMetricsToClipBoard() {
 function goToMetrics() {
   let url = document.URL;
   url = url.substr(0, url.lastIndexOf('/')+1) + 'metrics.html';
-  // console.log(url);
   window.open(url, '_blank');
 }
 
@@ -951,7 +934,6 @@ function goToMetricsPermaLink() {
   let url = document.URL;
   let b64 = getMetrics();
   url = url.substr(0, url.lastIndexOf('/')+1) + 'metrics.html#data=' + b64;
-  // console.log(url);
   window.open(url, '_blank');
 }
 
@@ -1137,25 +1119,101 @@ function getURLParam(sParam, defaultValue) {
 }
 
 function onDemoConfigChanged() {
-  const url = $('#streamURL').val();
-
   demoConfig = {
     enableStreaming,
     autoRecoverError,
-    enableWorker,
     dumpfMP4,
     levelCapping,
     limitMetrics,
-    defaultAudioCodec,
-    widevineLicenseUrl: escape(widevineLicenseUrl)
+  };
+
+  if (configPersistenceEnabled) {
+    persistEditorValue();
+  }
+
+  const serializedDemoConfig = btoa(JSON.stringify(demoConfig));
+  const baseURL = document.URL.split('?')[0];
+  const streamURL = $('#streamURL').val();
+  const permalinkURL = `${baseURL}?src=${encodeURIComponent(streamURL)}&demoConfig=${serializedDemoConfig}`;
+
+  $('#StreamPermalink').html(`<a href="${permalinkURL}">${permalinkURL}</a>`);
+}
+
+function onConfigPersistenceChanged(event) {
+  configPersistenceEnabled = event.target.checked;
+  localStorage.setItem(STORAGE_KEYS.Editor_Persistence, JSON.stringify(configPersistenceEnabled));
+
+  if (configPersistenceEnabled) {
+    persistEditorValue();
+  } else {
+    localStorage.removeItem(STORAGE_KEYS.Hls_Config);
+  }
+}
+
+function getEditorValue(options) {
+  options = $.extend({ parse: false }, options || {});
+  const value = configEditor.session.getValue();
+
+  if (options.parse) {
+    try {
+      value = JSON.parse(value);
+    } catch (e) {
+      console.warn('[getEditorValue] could not parse editor value', e);
+      value = {};
+    }
+  }
+
+  return value;
+}
+
+function getPersistedHlsConfig() {
+  var value = localStorage.getItem(STORAGE_KEYS.Hls_Config);
+
+  if (value === null) {
+    return value;
+  }
+
+  try {
+    value = JSON.parse(value);
+  } catch (e) {
+    console.warn('[getPersistedHlsConfig] could not hls config json', e);
+    value = {};
   }
 
-  const serializedDemoConfig = btoa(JSON.stringify(demoConfig))
+  return value;
+}
+
+function persistEditorValue() {
+  localStorage.setItem(STORAGE_KEYS.Hls_Config, getEditorValue());
+}
+
+function setupConfigEditor() {
+  configEditor = ace.edit('config-editor');
+  configEditor.setTheme('ace/theme/github');
+  configEditor.session.setMode('ace/mode/json');
+
+  const contents = hlsjsDefaults;
+  const shouldRestorePersisted = JSON.parse(localStorage.getItem(STORAGE_KEYS.Editor_Persistence)) === true;
+
+  if (shouldRestorePersisted) {
+    $.extend(contents, getPersistedHlsConfig());
+  }
 
-  const baseURL = document.URL.split('?')[0]
-  const permalinkURL = baseURL + `?src=${encodeURIComponent(url)}&demoConfig=${serializedDemoConfig}`
+  const elPersistence = document.querySelector('#configPersistence');
+  elPersistence.addEventListener('change', onConfigPersistenceChanged);
+  elPersistence.checked = shouldRestorePersisted;
 
-  $('#StreamPermalink').html('<a href="' + permalinkURL + '">' + permalinkURL + '</a>');
+  updateConfigEditorValue(contents);
+}
+
+function updateConfigEditorValue(obj) {
+  const json = JSON.stringify(obj, null, 2);
+  configEditor.session.setValue(json);
+}
+
+function applyConfigEditorValue() {
+  onDemoConfigChanged();
+  loadSelectedStream();
 }
 
 function createfMP4(type) {
diff --git a/demo/style.css b/demo/style.css
index 43fc384839c..e27a04b80b4 100644
--- a/demo/style.css
+++ b/demo/style.css
@@ -9,12 +9,12 @@ th, td {
 select {
   padding: 2px 15px;
   background-color: rgb(181, 222, 255);
-  font-weight: bolder;
-
+  font-weight: 600;
+  padding: 5px 0;
 }
 
 select option {
-  font-size: 10pt;
+  font-size: 11px;
 }
 
 .innerControls input {
@@ -23,44 +23,86 @@ select option {
 }
 
 #controls {
-    width: 70%;
-    min-width: 615px;
-    padding: 3px;
-    margin: 0px auto 20px auto;
-    border: 1px solid #606060;
-    overflow: hidden;
+  display: flex;
+  flex-direction: column;
+  width: 80%;
+  max-width: 1200px;
+  margin: 0 auto 20px auto;
+  border: 1px solid #606060;
+  overflow: hidden;
+}
+
+.demo-controls-wrapper {
+  flex: 1 1 auto;
+  max-width: 100%;
+  padding: 5px 5px 0 3px;
+}
+
+.config-editor-wrapper {
+  flex: 1 1 auto;
+  display: flex;
+  flex-direction: column;
+  border-top: solid 1px #ccc;
+  height: 256px;
+}
+
+.config-editor-container {
+  flex: 1 1 auto;
+  position: relative;
+  width: 100%;
+  height: 100%;
+}
+
+#config-editor {
+  position: absolute;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+}
+
+.config-editor-commands {
+  flex: 1 1 auto;
+  background-color: #ddd;
+  border-top: solid 1px #ccc;
+  padding: 5px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.config-editor-commands label {
+  margin-bottom: 0;
+}
+
+.config-editor-commands button {
+  padding: 5px 8px;
+  font-size: 14px;
 }
 
 .innerControls {
-    display:block;
-    float: left;
-    width: 99%;
-    margin: 3px;
-    padding-left: 3px;
-    font-size: 10pt
+  display: flex;
+  font-size: 12px;
+  align-items: center;
+  margin-bottom: 5px;
+  padding-left: 5px;
+  justify-content: space-between;
 }
 
 .videoCentered {
-    width: 720px;
-    margin-left: auto;
-    margin-right: auto;
-    display: block
+  width: 720px;
+  margin-left: auto;
+  margin-right: auto;
+  display: block
 }
 
 .center {
-    width: 70%;
-    min-width: 615px;
-    overflow: hidden;
-    margin-left: auto;
-    margin-right: auto;
-    display: block
-}
-
-#customButtons input {
-  width: 25%;
-  display : inline-block;
-  text-align: center;
-  font-size: 8pt;
+  width: 70%;
+  min-width: 615px;
+  overflow: hidden;
+  margin-left: auto;
+  margin-right: auto;
+  display: block
 }
 
 #toggleButtons button {
@@ -76,12 +118,57 @@ select option {
   height: auto;
   max-height: 4em;
   overflow: auto;
-  /*overflow-y: none;*/
 }
 
 #errorOut {
   height: auto;
   max-height: 4em;
   overflow: auto;
-  /*overflow-y: none;*/
+}
+
+
+#streamURL,
+#streamSelect {
+  width: calc(100% - 4px);
+  margin-left: 3px;
+}
+
+#streamURL {
+  margin-bottom: 10px;
+  padding-left: 3px;
+}
+
+#streamSelect {
+  padding: 5px 0;
+}
+
+#StreamPermalink {
+  flex: 1 1 auto;
+  min-width: 0;
+  overflow-wrap: break-word;
+  overflow: hidden;  /* for IE11 */
+  padding: 10px 0 0 10px;
+}
+
+#StreamPermalink a {
+  font-size: 10px;
+  font-family: monospace;
+}
+
+/* Small devices (portrait tablets and large phones, 600px and up) */
+@media only screen and (min-width: 600px) {
+  #controls {
+    flex-direction: row;
+  }
+
+  .demo-controls-wrapper {
+    max-width: 50%;
+  }
+
+  .config-editor-wrapper {
+    height: auto;
+    border-top: 0;
+    border-left: solid 1px #ccc;
+  }
+
 }
\ No newline at end of file

From 3902e1f9e48bb4646a8ce949e8f075ecef7322e7 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Wed, 30 Jan 2019 19:22:37 -0400
Subject: [PATCH 41/59] Add handling for AES-128 encrypted initialization
 segments needing IV.

---
 src/loader/fragment.ts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index ea16d8b8004..71dd15fcb8e 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -94,12 +94,21 @@ export default class Fragment {
     if (!this._decryptdata && this.levelkey) {
       let sn = this.sn;
       if (typeof sn !== 'number') {
+        // We are fetching decryption data for a initialization segment
+        // If the segment was encrypted with AES-128
+        // It must have an IV defined. We cannot substitute the Segment Number in.
+        if (this.levelkey && this.levelkey.method === 'AES-128') {
+          if (!this.levelkey.iv) {
+            throw new Error(`missing IV for initialization segment with method="${this.levelkey.method}"`);
+          }
+        }
+
         /*
         Be converted to a Number.
         'initSegment' will become NaN.
         NaN, which when converted through ToInt32() -> +0.
         ---
-        Explicitly set sn to expected value for 'initSegment' values for IV generation.
+        Explicitly set sn to resulting value from implicit conversions 'initSegment' values for IV generation.
         */
         sn = 0;
       }

From a31f1be6ac1bda989acd705d1b0235bbf29e0008 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Sat, 2 Feb 2019 08:39:08 -0400
Subject: [PATCH 42/59] Change IV handling for initSegments to just log a
 warning.

---
 src/loader/fragment.ts | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/loader/fragment.ts b/src/loader/fragment.ts
index 71dd15fcb8e..f32dc2b09b5 100644
--- a/src/loader/fragment.ts
+++ b/src/loader/fragment.ts
@@ -97,10 +97,8 @@ export default class Fragment {
         // We are fetching decryption data for a initialization segment
         // If the segment was encrypted with AES-128
         // It must have an IV defined. We cannot substitute the Segment Number in.
-        if (this.levelkey && this.levelkey.method === 'AES-128') {
-          if (!this.levelkey.iv) {
-            throw new Error(`missing IV for initialization segment with method="${this.levelkey.method}"`);
-          }
+        if (this.levelkey && this.levelkey.method === 'AES-128' && !this.levelkey.iv) {
+          logger.warn(`missing IV for initialization segment with method="${this.levelkey.method}" - compliance issue`);
         }
 
         /*
@@ -112,7 +110,7 @@ export default class Fragment {
         */
         sn = 0;
       }
-      this._decryptdata = this.fragmentDecryptdataFromLevelkey(this.levelkey, sn);
+      this._decryptdata = this.setDecryptDataFromLevelKey(this.levelkey, sn);
     }
 
     return this._decryptdata;
@@ -152,6 +150,7 @@ export default class Fragment {
 
   /**
    * Utility method for parseLevelPlaylist to create an initialization vector for a given segment
+   * @param {number} segmentNumber - segment number to generate IV with
    * @returns {Uint8Array}
    */
   createInitializationVector (segmentNumber: number): Uint8Array {
@@ -168,9 +167,9 @@ export default class Fragment {
    * Utility method for parseLevelPlaylist to get a fragment's decryption data from the currently parsed encryption key data
    * @param levelkey - a playlist's encryption info
    * @param segmentNumber - the fragment's segment number
-   * @returns {*} - an object to be applied as a fragment's decryptdata
+   * @returns {LevelKey} - an object to be applied as a fragment's decryptdata
    */
-  fragmentDecryptdataFromLevelkey (levelkey: LevelKey, segmentNumber: number): LevelKey {
+  setDecryptDataFromLevelKey (levelkey: LevelKey, segmentNumber: number): LevelKey {
     let decryptdata = levelkey;
 
     if (levelkey && levelkey.method && levelkey.uri && !levelkey.iv) {

From 80d855bcc7f27ef071c8db27823d628ac38cdcc2 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Wed, 30 Jan 2019 01:11:40 -0400
Subject: [PATCH 43/59] Playlist-loader rename.

---
 src/loader/{playlist-loader.js => playlist-loader.ts} | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename src/loader/{playlist-loader.js => playlist-loader.ts} (100%)

diff --git a/src/loader/playlist-loader.js b/src/loader/playlist-loader.ts
similarity index 100%
rename from src/loader/playlist-loader.js
rename to src/loader/playlist-loader.ts

From a3ca2f17646a3b6e3b8a62941996549830a8d57b Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Wed, 30 Jan 2019 18:47:25 -0400
Subject: [PATCH 44/59] Playlist Loader conversion to TypeScript.

---
 src/controller/stream-controller.js       |   6 +-
 src/loader/playlist-loader.ts             | 210 ++++++++++++----------
 src/types/loader.ts                       | 133 ++++++++++++++
 tests/unit/controller/fragment-tracker.js |  36 ++--
 4 files changed, 264 insertions(+), 121 deletions(-)
 create mode 100644 src/types/loader.ts

diff --git a/src/controller/stream-controller.js b/src/controller/stream-controller.js
index 5975475c914..5e9305d76be 100644
--- a/src/controller/stream-controller.js
+++ b/src/controller/stream-controller.js
@@ -7,8 +7,8 @@ import { BufferHelper } from '../utils/buffer-helper';
 import Demuxer from '../demux/demuxer';
 import Event from '../events';
 import { FragmentState } from './fragment-tracker';
-import Fragment, { ElementaryStreamTypes } from '../loader/fragment';
-import PlaylistLoader from '../loader/playlist-loader';
+import { ElementaryStreamTypes } from '../loader/fragment';
+import { PlaylistLevelType } from '../types/loader';
 import * as LevelHelper from './level-helper';
 import TimeRanges from '../utils/time-ranges';
 import { ErrorDetails } from '../errors';
@@ -483,7 +483,7 @@ class StreamController extends BaseStreamController {
   }
 
   getBufferedFrag (position) {
-    return this.fragmentTracker.getBufferedFrag(position, PlaylistLoader.LevelType.MAIN);
+    return this.fragmentTracker.getBufferedFrag(position, PlaylistLevelType.MAIN);
   }
 
   get currentLevel () {
diff --git a/src/loader/playlist-loader.ts b/src/loader/playlist-loader.ts
index 7bcc111d005..6aee398b7ba 100644
--- a/src/loader/playlist-loader.ts
+++ b/src/loader/playlist-loader.ts
@@ -12,39 +12,19 @@
 import Event from '../events';
 import EventHandler from '../event-handler';
 import { ErrorTypes, ErrorDetails } from '../errors';
-
 import { logger } from '../utils/logger';
-
+import { Loader, PlaylistContextType, PlaylistLoaderContext, PlaylistLevelType, LoaderCallbacks, LoaderResponse, LoaderStats, LoaderConfiguration } from '../types/loader';
 import MP4Demuxer from '../demux/mp4demuxer';
 import M3U8Parser from './m3u8-parser';
 
 const { performance } = window;
 
-/**
- * `type` property values for this loaders' context object
- * @enum
- *
- */
-const ContextType = {
-  MANIFEST: 'manifest',
-  LEVEL: 'level',
-  AUDIO_TRACK: 'audioTrack',
-  SUBTITLE_TRACK: 'subtitleTrack'
-};
-
-/**
- * @enum {string}
- */
-const LevelType = {
-  MAIN: 'main',
-  AUDIO: 'audio',
-  SUBTITLE: 'subtitle'
-};
-
 /**
  * @constructor
  */
 class PlaylistLoader extends EventHandler {
+  private loaders: Partial<Record<PlaylistContextType, Loader<PlaylistLoaderContext>>> = {};
+
   /**
    * @constructs
    * @param {Hls} hls
@@ -55,46 +35,36 @@ class PlaylistLoader extends EventHandler {
       Event.LEVEL_LOADING,
       Event.AUDIO_TRACK_LOADING,
       Event.SUBTITLE_TRACK_LOADING);
-
-    this.loaders = {};
-  }
-
-  static get ContextType () {
-    return ContextType;
-  }
-
-  static get LevelType () {
-    return LevelType;
   }
 
   /**
-   * @param {ContextType} type
+   * @param {PlaylistContextType} type
    * @returns {boolean}
    */
-  static canHaveQualityLevels (type) {
-    return (type !== ContextType.AUDIO_TRACK &&
-      type !== ContextType.SUBTITLE_TRACK);
+  static canHaveQualityLevels (type: PlaylistContextType): boolean {
+    return (type !== PlaylistContextType.AUDIO_TRACK &&
+      type !== PlaylistContextType.SUBTITLE_TRACK);
   }
 
   /**
    * Map context.type to LevelType
-   * @param {{type: ContextType}} context
+   * @param {PlaylistLoaderContext} context
    * @returns {LevelType}
    */
-  static mapContextToLevelType (context) {
+  static mapContextToLevelType (context: PlaylistLoaderContext): PlaylistLevelType {
     const { type } = context;
 
     switch (type) {
-    case ContextType.AUDIO_TRACK:
-      return LevelType.AUDIO;
-    case ContextType.SUBTITLE_TRACK:
-      return LevelType.SUBTITLE;
+    case PlaylistContextType.AUDIO_TRACK:
+      return PlaylistLevelType.AUDIO;
+    case PlaylistContextType.SUBTITLE_TRACK:
+      return PlaylistLevelType.SUBTITLE;
     default:
-      return LevelType.MAIN;
+      return PlaylistLevelType.MAIN;
     }
   }
 
-  static getResponseUrl (response, context) {
+  static getResponseUrl (response: LoaderResponse, context: PlaylistLoaderContext): string {
     let url = response.url;
     // responseURL not supported on some browsers (it is used to detect URL redirection)
     // data-uri mode also not supported (but no need to detect redirection)
@@ -108,28 +78,30 @@ class PlaylistLoader extends EventHandler {
   /**
    * Returns defaults or configured loader-type overloads (pLoader and loader config params)
    * Default loader is XHRLoader (see utils)
-   * @param {object} context
-   * @returns {XHRLoader} or other compatible configured overload
+   * @param {PlaylistLoaderContext} context
+   * @returns {Loader} or other compatible configured overload
    */
-  createInternalLoader (context) {
+  createInternalLoader (context: PlaylistLoaderContext): Loader<PlaylistLoaderContext> {
     const config = this.hls.config;
     const PLoader = config.pLoader;
     const Loader = config.loader;
+    // TODO(typescript-config): Verify once config is typed that InternalLoader always returns a Loader
     const InternalLoader = PLoader || Loader;
 
     const loader = new InternalLoader(config);
 
+    // TODO - Do we really need to assign the instance or if the dep has been lost
     context.loader = loader;
     this.loaders[context.type] = loader;
 
     return loader;
   }
 
-  getInternalLoader (context) {
+  getInternalLoader (context: PlaylistLoaderContext): Loader<PlaylistLoaderContext> | undefined {
     return this.loaders[context.type];
   }
 
-  resetInternalLoader (contextType) {
+  resetInternalLoader (contextType: PlaylistContextType) {
     if (this.loaders[contextType]) {
       delete this.loaders[contextType];
     }
@@ -145,7 +117,7 @@ class PlaylistLoader extends EventHandler {
         loader.destroy();
       }
 
-      this.resetInternalLoader(contextType);
+      this.resetInternalLoader(contextType as PlaylistContextType);
     }
   }
 
@@ -155,23 +127,47 @@ class PlaylistLoader extends EventHandler {
     super.destroy();
   }
 
-  onManifestLoading (data) {
-    this.load(data.url, { type: ContextType.MANIFEST, level: 0, id: null });
+  onManifestLoading (data: { url: string; }) {
+    this.load({
+      url: data.url,
+      type: PlaylistContextType.MANIFEST,
+      level: 0,
+      id: null,
+      responseType: 'text'
+    });
   }
 
-  onLevelLoading (data) {
-    this.load(data.url, { type: ContextType.LEVEL, level: data.level, id: data.id });
+  onLevelLoading (data: { url: string; level: number | null; id: number | null; }) {
+    this.load({
+      url: data.url,
+      type: PlaylistContextType.LEVEL,
+      level: data.level,
+      id: data.id,
+      responseType: 'text'
+    });
   }
 
-  onAudioTrackLoading (data) {
-    this.load(data.url, { type: ContextType.AUDIO_TRACK, level: null, id: data.id });
+  onAudioTrackLoading (data: { url: string; id: number | null; }) {
+    this.load({
+      url: data.url,
+      type: PlaylistContextType.AUDIO_TRACK,
+      level: null,
+      id: data.id,
+      responseType: 'text'
+    });
   }
 
-  onSubtitleTrackLoading (data) {
-    this.load(data.url, { type: ContextType.SUBTITLE_TRACK, level: null, id: data.id });
+  onSubtitleTrackLoading (data: { url: string; id: number | null; }) {
+    this.load({
+      url: data.url,
+      type: PlaylistContextType.SUBTITLE_TRACK,
+      level: null,
+      id: data.id,
+      responseType: 'text'
+    });
   }
 
-  load (url, context) {
+  load (context: PlaylistLoaderContext): boolean {
     const config = this.hls.config;
 
     logger.debug(`Loading playlist of type ${context.type}, level: ${context.level}, id: ${context.id}`);
@@ -180,7 +176,7 @@ class PlaylistLoader extends EventHandler {
     let loader = this.getInternalLoader(context);
     if (loader) {
       const loaderContext = loader.context;
-      if (loaderContext && loaderContext.url === url) { // same URL can't overlap
+      if (loaderContext && loaderContext.url === context.url) { // same URL can't overlap
         logger.trace('playlist request ongoing');
         return false;
       } else {
@@ -189,23 +185,25 @@ class PlaylistLoader extends EventHandler {
       }
     }
 
-    let maxRetry,
-      timeout,
-      retryDelay,
-      maxRetryDelay;
+    let maxRetry: number;
+    let timeout: number;
+    let retryDelay: number;
+    let maxRetryDelay: number;
 
     // apply different configs for retries depending on
     // context (manifest, level, audio/subs playlist)
     switch (context.type) {
-    case ContextType.MANIFEST:
+    case PlaylistContextType.MANIFEST:
       maxRetry = config.manifestLoadingMaxRetry;
       timeout = config.manifestLoadingTimeOut;
       retryDelay = config.manifestLoadingRetryDelay;
       maxRetryDelay = config.manifestLoadingMaxRetryTimeout;
       break;
-    case ContextType.LEVEL:
+    case PlaylistContextType.LEVEL:
       // Disable internal loader retry logic, since we are managing retries in Level Controller
       maxRetry = 0;
+      maxRetryDelay = 0;
+      retryDelay = 0;
       timeout = config.levelLoadingTimeOut;
       // TODO Introduce retry settings for audio-track and subtitle-track, it should not use level retry config
       break;
@@ -219,30 +217,26 @@ class PlaylistLoader extends EventHandler {
 
     loader = this.createInternalLoader(context);
 
-    context.url = url;
-    context.responseType = context.responseType || ''; // FIXME: (should not be necessary to do this)
-
-    const loaderConfig = {
+    const loaderConfig: LoaderConfiguration = {
       timeout,
       maxRetry,
       retryDelay,
       maxRetryDelay
     };
 
-    const loaderCallbacks = {
+    const loaderCallbacks: LoaderCallbacks<PlaylistLoaderContext> = {
       onSuccess: this.loadsuccess.bind(this),
       onError: this.loaderror.bind(this),
       onTimeout: this.loadtimeout.bind(this)
     };
 
-    logger.debug(`Calling internal loader delegate for URL: ${url}`);
-
+    logger.debug(`Calling internal loader delegate for URL: ${context.url}`);
     loader.load(context, loaderConfig, loaderCallbacks);
 
     return true;
   }
 
-  loadsuccess (response, stats, context, networkDetails = null) {
+  loadsuccess (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any = null) {
     if (context.isSidxRequest) {
       this._handleSidxRequest(response, context);
       this._handlePlaylistLoaded(response, stats, context, networkDetails);
@@ -250,6 +244,9 @@ class PlaylistLoader extends EventHandler {
     }
 
     this.resetInternalLoader(context.type);
+    if (typeof response.data !== 'string') {
+      throw new Error('expected responseType of "text" for PlaylistLoader');
+    }
 
     const string = response.data;
 
@@ -270,15 +267,17 @@ class PlaylistLoader extends EventHandler {
     }
   }
 
-  loaderror (response, context, networkDetails = null) {
+  loaderror (response: LoaderResponse, context: PlaylistLoaderContext, networkDetails = null) {
     this._handleNetworkError(context, networkDetails, false, response);
   }
 
-  loadtimeout (stats, context, networkDetails = null) {
+  loadtimeout (stats: LoaderStats, context: PlaylistLoaderContext, networkDetails = null) {
     this._handleNetworkError(context, networkDetails, true);
   }
 
-  _handleMasterPlaylist (response, stats, context, networkDetails) {
+  // TODO(typescript-config): networkDetails can currently be a XHR or Fetch impl,
+  // but with custom loaders it could be generic investigate this further when config is typed
+  _handleMasterPlaylist (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any) {
     const hls = this.hls;
     const string = response.data;
 
@@ -332,27 +331,29 @@ class PlaylistLoader extends EventHandler {
     });
   }
 
-  _handleTrackOrLevelPlaylist (response, stats, context, networkDetails) {
+  _handleTrackOrLevelPlaylist (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any) {
     const hls = this.hls;
 
     const { id, level, type } = context;
 
     const url = PlaylistLoader.getResponseUrl(response, context);
 
-    const levelUrlId = Number.isFinite(id) ? id : 0;
-    const levelId = Number.isFinite(level) ? level : levelUrlId;
-    const levelType = PlaylistLoader.mapContextToLevelType(context);
+    // if the values are null, they will result in the else conditional
+    const levelUrlId = Number.isFinite(id as number) ? id : 0;
+    const levelId = Number.isFinite(level as number) ? level : levelUrlId;
 
+    const levelType = PlaylistLoader.mapContextToLevelType(context);
     const levelDetails = M3U8Parser.parseLevelPlaylist(response.data, url, levelId, levelType, levelUrlId);
 
     // set stats on level structure
-    levelDetails.tload = stats.tload;
+    // TODO(jstackhouse): why? mixing concerns, is it just treated as value bag?
+    (levelDetails as any).tload = stats.tload;
 
     // We have done our first request (Manifest-type) and receive
     // not a master playlist but a chunk-list (track/level)
     // We fire the manifest-loaded event anyway with the parsed level-details
     // by creating a single-level structure for it.
-    if (type === ContextType.MANIFEST) {
+    if (type === PlaylistContextType.MANIFEST) {
       const singleLevel = {
         url,
         details: levelDetails
@@ -375,7 +376,8 @@ class PlaylistLoader extends EventHandler {
     // the SIDX box.
     if (levelDetails.needSidxRanges) {
       const sidxUrl = levelDetails.initSegment.url;
-      this.load(sidxUrl, {
+      this.load({
+        url: sidxUrl,
         isSidxRequest: true,
         type,
         level,
@@ -394,7 +396,11 @@ class PlaylistLoader extends EventHandler {
     this._handlePlaylistLoaded(response, stats, context, networkDetails);
   }
 
-  _handleSidxRequest (response, context) {
+  _handleSidxRequest (response: LoaderResponse, context: PlaylistLoaderContext) {
+    if (typeof response.data === 'string') {
+      throw new Error('sidx request must be made with responseType of array buffer');
+    }
+
     const sidxInfo = MP4Demuxer.parseSegmentIndex(new Uint8Array(response.data));
     // if provided fragment does not contain sidx, early return
     if (!sidxInfo) {
@@ -404,16 +410,21 @@ class PlaylistLoader extends EventHandler {
     const levelDetails = context.levelDetails;
     sidxReferences.forEach((segmentRef, index) => {
       const segRefInfo = segmentRef.info;
+      if (!levelDetails) {
+        return;
+      }
       const frag = levelDetails.fragments[index];
-
       if (frag.byteRange.length === 0) {
         frag.setByteRange(String(1 + segRefInfo.end - segRefInfo.start) + '@' + String(segRefInfo.start));
       }
     });
-    levelDetails.initSegment.setByteRange(String(sidxInfo.moovEndOffset) + '@0');
+
+    if (levelDetails) {
+      levelDetails.initSegment.setByteRange(String(sidxInfo.moovEndOffset) + '@0');
+    }
   }
 
-  _handleManifestParsingError (response, context, reason, networkDetails) {
+  _handleManifestParsingError (response: LoaderResponse, context: PlaylistLoaderContext, reason: string, networkDetails: any) {
     this.hls.trigger(Event.ERROR, {
       type: ErrorTypes.NETWORK_ERROR,
       details: ErrorDetails.MANIFEST_PARSING_ERROR,
@@ -424,7 +435,7 @@ class PlaylistLoader extends EventHandler {
     });
   }
 
-  _handleNetworkError (context, networkDetails, timeout = false, response = null) {
+  _handleNetworkError (context: PlaylistLoaderContext, networkDetails: any, timeout: boolean = false, response: LoaderResponse | null = null) {
     logger.info(`A network error occured while loading a ${context.type}-type playlist`);
 
     let details;
@@ -433,15 +444,15 @@ class PlaylistLoader extends EventHandler {
     const loader = this.getInternalLoader(context);
 
     switch (context.type) {
-    case ContextType.MANIFEST:
+    case PlaylistContextType.MANIFEST:
       details = (timeout ? ErrorDetails.MANIFEST_LOAD_TIMEOUT : ErrorDetails.MANIFEST_LOAD_ERROR);
       fatal = true;
       break;
-    case ContextType.LEVEL:
+    case PlaylistContextType.LEVEL:
       details = (timeout ? ErrorDetails.LEVEL_LOAD_TIMEOUT : ErrorDetails.LEVEL_LOAD_ERROR);
       fatal = false;
       break;
-    case ContextType.AUDIO_TRACK:
+    case PlaylistContextType.AUDIO_TRACK:
       details = (timeout ? ErrorDetails.AUDIO_TRACK_LOAD_TIMEOUT : ErrorDetails.AUDIO_TRACK_LOAD_ERROR);
       fatal = false;
       break;
@@ -455,11 +466,12 @@ class PlaylistLoader extends EventHandler {
       this.resetInternalLoader(context.type);
     }
 
-    let errorData = {
+    // TODO(typescript-events): when error events are handled, type this
+    let errorData: any = {
       type: ErrorTypes.NETWORK_ERROR,
       details,
       fatal,
-      url: loader.url,
+      url: context.url,
       loader,
       context,
       networkDetails
@@ -472,10 +484,10 @@ class PlaylistLoader extends EventHandler {
     this.hls.trigger(Event.ERROR, errorData);
   }
 
-  _handlePlaylistLoaded (response, stats, context, networkDetails) {
+  _handlePlaylistLoaded (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any) {
     const { type, level, id, levelDetails } = context;
 
-    if (!levelDetails.targetduration) {
+    if (!levelDetails || !levelDetails.targetduration) {
       this._handleManifestParsingError(response, context, 'invalid target duration', networkDetails);
       return;
     }
@@ -491,7 +503,7 @@ class PlaylistLoader extends EventHandler {
       });
     } else {
       switch (type) {
-      case ContextType.AUDIO_TRACK:
+      case PlaylistContextType.AUDIO_TRACK:
         this.hls.trigger(Event.AUDIO_TRACK_LOADED, {
           details: levelDetails,
           id,
@@ -499,7 +511,7 @@ class PlaylistLoader extends EventHandler {
           networkDetails
         });
         break;
-      case ContextType.SUBTITLE_TRACK:
+      case PlaylistContextType.SUBTITLE_TRACK:
         this.hls.trigger(Event.SUBTITLE_TRACK_LOADED, {
           details: levelDetails,
           id,
diff --git a/src/types/loader.ts b/src/types/loader.ts
new file mode 100644
index 00000000000..0272d230909
--- /dev/null
+++ b/src/types/loader.ts
@@ -0,0 +1,133 @@
+import Level from '../loader/level';
+
+export interface LoaderContext {
+  // target URL
+  url: string
+  // loader response type (arraybuffer or default response type for playlist)
+  responseType: XMLHttpRequestResponseType
+  // start byte range offset
+  rangeStart?: number
+  // end byte range offset
+  rangeEnd?: number
+  // true if onProgress should report partial chunk of loaded content
+  progressData?: boolean
+}
+
+export interface LoaderConfiguration {
+  // Max number of load retries
+  maxRetry: number
+  // Timeout after which `onTimeOut` callback will be triggered
+  // (if loading is still not finished after that delay)
+  timeout: number
+  // Delay between an I/O error and following connection retry (ms).
+  // This to avoid spamming the server
+  retryDelay: number
+  // max connection retry delay (ms)
+  maxRetryDelay: number
+}
+
+export interface LoaderResponse {
+  url: string,
+  // TODO(jstackhouse): SharedArrayBuffer, es2017 extension to TS
+  data: string | ArrayBuffer
+}
+
+export interface LoaderStats {
+  // performance.now() just after load() has been called
+  trequest: number
+  // performance.now() of first received byte
+  tfirst: number
+  // performance.now() on load complete
+  tload: number
+  // performance.now() on parse completion
+  tparsed: number
+  // number of loaded bytes
+  loaded: number
+  // total number of bytes
+  total: number
+}
+
+type LoaderOnSuccess < T extends LoaderContext > = (
+  response: LoaderResponse,
+  stats: LoaderStats,
+  context: T,
+  networkDetails: any
+) => void;
+
+type LoaderOnProgress < T extends LoaderContext > = (
+  stats: LoaderStats,
+  context: T,
+  data: string | ArrayBuffer,
+  networkDetails: any,
+) => void;
+
+type LoaderOnError < T extends LoaderContext > = (
+  error: {
+    // error status code
+    code: number,
+    // error description
+    text: string,
+  },
+  context: T,
+  networkDetails: any,
+) => void;
+
+type LoaderOnTimeout < T extends LoaderContext > = (
+  stats: LoaderStats,
+  context: T,
+) => void;
+
+export interface LoaderCallbacks<T extends LoaderContext>{
+  onSuccess: LoaderOnSuccess<T>,
+  onError: LoaderOnError<T>,
+  onTimeout: LoaderOnTimeout<T>,
+  onProgress?: LoaderOnProgress<T>,
+}
+
+// TODO: define callbacks - see https://github.com/video-dev/hls.js/blob/master/docs/API.md#loader
+export interface Loader<T extends LoaderContext> {
+  destory(): void
+  abort(): void
+  load(
+    context: LoaderContext,
+    config: LoaderConfiguration,
+    callbacks: LoaderCallbacks<T>,
+  ): void
+
+  context: T
+}
+
+/**
+ * `type` property values for this loaders' context object
+ * @enum
+ *
+ */
+export enum PlaylistContextType {
+  MANIFEST = 'manifest',
+  LEVEL = 'level',
+  AUDIO_TRACK = 'audioTrack',
+  SUBTITLE_TRACK= 'subtitleTrack'
+}
+
+/**
+ * @enum {string}
+ */
+export enum PlaylistLevelType {
+  MAIN = 'main',
+  AUDIO = 'audio',
+  SUBTITLE = 'subtitle'
+}
+
+export interface PlaylistLoaderContext extends LoaderContext {
+  loader?: Loader<PlaylistLoaderContext>
+
+  type: PlaylistContextType
+  // the level index to load
+  level: number | null
+  // TODO: what is id?
+  id: number | null
+  // defines if the loader is handling a sidx request for the playlist
+  isSidxRequest?: boolean
+  // internal reprsentation of a parsed m3u8 level playlist
+  levelDetails?: Level
+}
diff --git a/tests/unit/controller/fragment-tracker.js b/tests/unit/controller/fragment-tracker.js
index b557cd31b8f..af5288d0e96 100644
--- a/tests/unit/controller/fragment-tracker.js
+++ b/tests/unit/controller/fragment-tracker.js
@@ -1,9 +1,7 @@
 import Hls from '../../../src/hls';
 import Event from '../../../src/events';
 import { FragmentTracker, FragmentState } from '../../../src/controller/fragment-tracker';
-import PlaylistLoader from '../../../src/loader/playlist-loader';
-
-const LevelType = PlaylistLoader.LevelType;
+import { PlaylistLevelType } from '../../../src/types/loader';
 
 function createMockBuffer (buffered) {
   return {
@@ -216,14 +214,14 @@ describe('FragmentTracker', function () {
       fragments.forEach(fragment => {
         loadFragmentAndBuffered(hls, fragment);
       });
-      expect(fragmentTracker.getBufferedFrag(0.0, LevelType.MAIN)).to.equal(fragments[0]);
-      expect(fragmentTracker.getBufferedFrag(0.1, LevelType.MAIN)).to.equal(fragments[0]);
-      expect(fragmentTracker.getBufferedFrag(1.0, LevelType.MAIN)).to.equal(fragments[1]);
-      expect(fragmentTracker.getBufferedFrag(1.1, LevelType.MAIN)).to.equal(fragments[1]);
-      expect(fragmentTracker.getBufferedFrag(2.0, LevelType.MAIN)).to.equal(fragments[2]);
-      expect(fragmentTracker.getBufferedFrag(2.1, LevelType.MAIN)).to.equal(fragments[2]);
-      expect(fragmentTracker.getBufferedFrag(2.9, LevelType.MAIN)).to.equal(fragments[2]);
-      expect(fragmentTracker.getBufferedFrag(3.0, LevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(0.0, PlaylistLevelType.MAIN)).to.equal(fragments[0]);
+      expect(fragmentTracker.getBufferedFrag(0.1, PlaylistLevelType.MAIN)).to.equal(fragments[0]);
+      expect(fragmentTracker.getBufferedFrag(1.0, PlaylistLevelType.MAIN)).to.equal(fragments[1]);
+      expect(fragmentTracker.getBufferedFrag(1.1, PlaylistLevelType.MAIN)).to.equal(fragments[1]);
+      expect(fragmentTracker.getBufferedFrag(2.0, PlaylistLevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(2.1, PlaylistLevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(2.9, PlaylistLevelType.MAIN)).to.equal(fragments[2]);
+      expect(fragmentTracker.getBufferedFrag(3.0, PlaylistLevelType.MAIN)).to.equal(fragments[2]);
     });
     it('should return null if found it, but it is not buffered', function () {
       const fragments = [
@@ -256,10 +254,10 @@ describe('FragmentTracker', function () {
       fragments.forEach(fragment => {
         loadFragment(hls, fragment);
       });
-      expect(fragmentTracker.getBufferedFrag(0, LevelType.MAIN)).to.not.exist;
-      expect(fragmentTracker.getBufferedFrag(1, LevelType.MAIN)).to.not.exist;
-      expect(fragmentTracker.getBufferedFrag(2, LevelType.MAIN)).to.not.exist;
-      expect(fragmentTracker.getBufferedFrag(3, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(0, PlaylistLevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(1, PlaylistLevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(2, PlaylistLevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(3, PlaylistLevelType.MAIN)).to.not.exist;
     });
     it('should return null if anyone does not match the position', function () {
       loadFragmentAndBuffered(hls, createMockFragment({
@@ -270,10 +268,10 @@ describe('FragmentTracker', function () {
         type: 'main'
       }, ['audio', 'video']));
       // not found
-      expect(fragmentTracker.getBufferedFrag(1.1, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(1.1, PlaylistLevelType.MAIN)).to.not.exist;
     });
     it('should return null if fragmentTracker not have any fragments', function () {
-      expect(fragmentTracker.getBufferedFrag(0, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(0, PlaylistLevelType.MAIN)).to.not.exist;
     });
     it('should return null if not found match levelType', function () {
       loadFragmentAndBuffered(hls, createMockFragment({
@@ -281,10 +279,10 @@ describe('FragmentTracker', function () {
         endPTS: 1,
         sn: 1,
         level: 1,
-        type: LevelType.AUDIO // <= level type is not "main"
+        type: PlaylistLevelType.AUDIO // <= level type is not "main"
       }, ['audio', 'video']));
 
-      expect(fragmentTracker.getBufferedFrag(0, LevelType.MAIN)).to.not.exist;
+      expect(fragmentTracker.getBufferedFrag(0, PlaylistLevelType.MAIN)).to.not.exist;
     });
   });
 

From b0040fe276b3a1dab793bda8e27fa6fdb77884c9 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Mon, 4 Feb 2019 23:10:13 -0400
Subject: [PATCH 45/59] Lint fixes

---
 src/config.js                    | 22 ++++-----
 src/controller/abr-controller.js | 85 ++++++++++++++++++--------------
 src/hls.js                       | 17 ++++---
 3 files changed, 70 insertions(+), 54 deletions(-)

diff --git a/src/config.js b/src/config.js
index 22d31a52a0c..990c29956c5 100644
--- a/src/config.js
+++ b/src/config.js
@@ -20,10 +20,10 @@ import EMEController from './controller/eme-controller';
 
 import { requestMediaKeySystemAccess } from './utils/mediakeys-helper';
 
-export var hlsDefaultConfig = {
+export const hlsDefaultConfig = {
   autoStartLoad: true, // used by stream-controller
   startPosition: -1, // used by stream-controller
-  defaultAudioCodec: undefined, // used by stream-controller
+  defaultAudioCodec: void 0, // used by stream-controller
   debug: false, // used by logger
   capLevelOnFPSDrop: false, // used by fps-controller
   capLevelToPlayerSize: false, // used by cap-level-controller
@@ -39,8 +39,8 @@ export var hlsDefaultConfig = {
   maxFragLookUpTolerance: 0.25, // used by stream-controller
   liveSyncDurationCount: 3, // used by stream-controller
   liveMaxLatencyDurationCount: Infinity, // used by stream-controller
-  liveSyncDuration: undefined, // used by stream-controller
-  liveMaxLatencyDuration: undefined, // used by stream-controller
+  liveSyncDuration: void 0, // used by stream-controller
+  liveMaxLatencyDuration: void 0, // used by stream-controller
   liveDurationInfinity: false, // used by buffer-controller
   liveBackBufferLength: Infinity, // used by buffer-controller
   maxMaxBufferLength: 600, // used by stream-controller
@@ -50,7 +50,7 @@ export var hlsDefaultConfig = {
   manifestLoadingMaxRetry: 1, // used by playlist-loader
   manifestLoadingRetryDelay: 1000, // used by playlist-loader
   manifestLoadingMaxRetryTimeout: 64000, // used by playlist-loader
-  startLevel: undefined, // used by level-controller
+  startLevel: void 0, // used by level-controller
   levelLoadingTimeOut: 10000, // used by playlist-loader
   levelLoadingMaxRetry: 4, // used by playlist-loader
   levelLoadingRetryDelay: 1000, // used by playlist-loader
@@ -65,11 +65,11 @@ export var hlsDefaultConfig = {
   appendErrorMaxRetry: 3, // used by buffer-controller
   loader: XhrLoader,
   // loader: FetchLoader,
-  fLoader: undefined, // used by fragment-loader
-  pLoader: undefined, // used by playlist-loader
-  xhrSetup: undefined, // used by xhr-loader
-  licenseXhrSetup: undefined, // used by eme-controller
-  // fetchSetup: undefined,
+  fLoader: void 0, // used by fragment-loader
+  pLoader: void 0, // used by playlist-loader
+  xhrSetup: void 0, // used by xhr-loader
+  licenseXhrSetup: void 0, // used by eme-controller
+  // fetchSetup: void 0,
   abrController: AbrController,
   bufferController: BufferController,
   capLevelController: CapLevelController,
@@ -89,7 +89,7 @@ export var hlsDefaultConfig = {
   maxLoadingDelay: 4, // used by abr-controller
   minAutoBitrate: 0, // used by hls
   emeEnabled: false, // used by eme-controller
-  widevineLicenseUrl: undefined, // used by eme-controller
+  widevineLicenseUrl: void 0, // used by eme-controller
   requestMediaKeySystemAccessFunc:
             requestMediaKeySystemAccess // used by eme-controller
 };
diff --git a/src/controller/abr-controller.js b/src/controller/abr-controller.js
index 0777d363c33..2acc90d1412 100644
--- a/src/controller/abr-controller.js
+++ b/src/controller/abr-controller.js
@@ -48,7 +48,8 @@ class AbrController extends EventHandler {
         const level = frag.level;
         const isLive = hls.levels[level].details.live;
 
-        let ewmaFast, ewmaSlow;
+        let ewmaFast;
+        let ewmaSlow;
         if (isLive) {
           ewmaFast = config.abrEwmaFastLive;
           ewmaSlow = config.abrEwmaSlowLive;
@@ -90,32 +91,40 @@ class AbrController extends EventHandler {
     /* only monitor frag retrieval time if
     (video not paused OR first fragment being loaded(ready state === HAVE_NOTHING = 0)) AND autoswitching enabled AND not lowest level (=> means that we have several levels) */
     if (video && stats && ((!video.paused && (video.playbackRate !== 0)) || !video.readyState) && frag.autoLevel && frag.level) {
-      let requestDelay = performance.now() - stats.trequest,
-        playbackRate = Math.abs(video.playbackRate);
+      const requestDelay = performance.now() - stats.trequest;
+      const playbackRate = Math.abs(video.playbackRate);
+
       // monitor fragment load progress after half of expected fragment duration,to stabilize bitrate
       if (requestDelay > (500 * frag.duration / playbackRate)) {
-        let levels = hls.levels,
-          loadRate = Math.max(1, stats.bw ? stats.bw / 8 : stats.loaded * 1000 / requestDelay), // byte/s; at least 1 byte/s to avoid division by zero
-          // compute expected fragment length using frag duration and level bitrate. also ensure that expected len is gte than already loaded size
-          level = levels[frag.level],
-          levelBitrate = level.realBitrate ? Math.max(level.realBitrate, level.bitrate) : level.bitrate,
-          expectedLen = stats.total ? stats.total : Math.max(stats.loaded, Math.round(frag.duration * levelBitrate / 8)),
-          pos = video.currentTime,
-          fragLoadedDelay = (expectedLen - stats.loaded) / loadRate,
-          bufferStarvationDelay = (BufferHelper.bufferInfo(video, pos, hls.config.maxBufferHole).end - pos) / playbackRate;
+        const levels = hls.levels;
+        const loadRate = Math.max(1, stats.bw ? stats.bw / 8 : stats.loaded * 1000 / requestDelay); // byte/s; at least 1 byte/s to avoid division by zero
+
+        // compute expected fragment length using frag duration and level bitrate. also ensure that expected len is gte than already loaded size
+        const level = levels[frag.level];
+        const levelBitrate = level.realBitrate ? Math.max(level.realBitrate, level.bitrate) : level.bitrate;
+        const expectedLen = stats.total ? stats.total : Math.max(stats.loaded, Math.round(frag.duration * levelBitrate / 8));
+        const pos = video.currentTime;
+        const fragLoadedDelay = (expectedLen - stats.loaded) / loadRate;
+        const bufferStarvationDelay = (BufferHelper.bufferInfo(video, pos, hls.config.maxBufferHole).end - pos) / playbackRate;
+
         // consider emergency switch down only if we have less than 2 frag buffered AND
         // time to finish loading current fragment is bigger than buffer starvation delay
         // ie if we risk buffer starvation if bw does not increase quickly
         if ((bufferStarvationDelay < (2 * frag.duration / playbackRate)) && (fragLoadedDelay > bufferStarvationDelay)) {
-          let fragLevelNextLoadedDelay, nextLoadLevel;
+          let fragLevelNextLoadedDelay;
+          let nextLoadLevel;
           // lets iterate through lower level and try to find the biggest one that could avoid rebuffering
           // we start from current level - 1 and we step down , until we find a matching level
           for (nextLoadLevel = frag.level - 1; nextLoadLevel > minAutoLevel; nextLoadLevel--) {
             // compute time to load next fragment at lower level
             // 0.8 : consider only 80% of current bw to be conservative
             // 8 = bits per byte (bps/Bps)
-            let levelNextBitrate = levels[nextLoadLevel].realBitrate ? Math.max(levels[nextLoadLevel].realBitrate, levels[nextLoadLevel].bitrate) : levels[nextLoadLevel].bitrate;
-            fragLevelNextLoadedDelay = frag.duration * levelNextBitrate / (8 * 0.8 * loadRate);
+            const levelNextBitrate = levels[nextLoadLevel].realBitrate
+              ? Math.max(levels[nextLoadLevel].realBitrate, levels[nextLoadLevel].bitrate)
+              : levels[nextLoadLevel].bitrate;
+
+            const fragLevelNextLoadedDelay = frag.duration * levelNextBitrate / (8 * 0.8 * loadRate);
+
             if (fragLevelNextLoadedDelay < bufferStarvationDelay) {
               // we found a lower level that be rebuffering free with current estimated bw !
               break;
@@ -227,17 +236,19 @@ class AbrController extends EventHandler {
     return nextABRAutoLevel;
   }
   get _nextABRAutoLevel () {
-    let hls = this.hls, maxAutoLevel = hls.maxAutoLevel, levels = hls.levels, config = hls.config, minAutoLevel = hls.minAutoLevel;
-    const video = hls.media,
-      currentLevel = this.lastLoadedFragLevel,
-      currentFragDuration = this.fragCurrent ? this.fragCurrent.duration : 0,
-      pos = (video ? video.currentTime : 0),
-      // playbackRate is the absolute value of the playback rate; if video.playbackRate is 0, we use 1 to load as
-      // if we're playing back at the normal rate.
-      playbackRate = ((video && (video.playbackRate !== 0)) ? Math.abs(video.playbackRate) : 1.0),
-      avgbw = this._bwEstimator ? this._bwEstimator.getEstimate() : config.abrEwmaDefaultEstimate,
-      // bufferStarvationDelay is the wall-clock time left until the playback buffer is exhausted.
-      bufferStarvationDelay = (BufferHelper.bufferInfo(video, pos, config.maxBufferHole).end - pos) / playbackRate;
+    let hls = this.hls;
+    const { maxAutoLevel, levels, config, minAutoLevel } = hls;
+    const video = hls.media;
+    const currentLevel = this.lastLoadedFragLevel;
+    const currentFragDuration = this.fragCurrent ? this.fragCurrent.duration : 0;
+    const pos = (video ? video.currentTime : 0);
+
+    // playbackRate is the absolute value of the playback rate; if video.playbackRate is 0, we use 1 to load as
+    // if we're playing back at the normal rate.
+    const playbackRate = ((video && (video.playbackRate !== 0)) ? Math.abs(video.playbackRate) : 1.0);
+    const avgbw = this._bwEstimator ? this._bwEstimator.getEstimate() : config.abrEwmaDefaultEstimate;
+    // bufferStarvationDelay is the wall-clock time left until the playback buffer is exhausted.
+    const bufferStarvationDelay = (BufferHelper.bufferInfo(video, pos, config.maxBufferHole).end - pos) / playbackRate;
 
     // First, look to see if we can find a level matching with our avg bandwidth AND that could also guarantee no rebuffering at all
     let bestLevel = this._findBestLevel(currentLevel, currentFragDuration, avgbw, minAutoLevel, maxAutoLevel, bufferStarvationDelay, config.abrBandWidthFactor, config.abrBandWidthUpFactor, levels);
@@ -247,9 +258,10 @@ class AbrController extends EventHandler {
       logger.trace('rebuffering expected to happen, lets try to find a quality level minimizing the rebuffering');
       // not possible to get rid of rebuffering ... let's try to find level that will guarantee less than maxStarvationDelay of rebuffering
       // if no matching level found, logic will return 0
-      let maxStarvationDelay = currentFragDuration ? Math.min(currentFragDuration, config.maxStarvationDelay) : config.maxStarvationDelay,
-        bwFactor = config.abrBandWidthFactor,
-        bwUpFactor = config.abrBandWidthUpFactor;
+      let maxStarvationDelay = currentFragDuration ? Math.min(currentFragDuration, config.maxStarvationDelay) : config.maxStarvationDelay;
+      let bwFactor = config.abrBandWidthFactor;
+      let bwUpFactor = config.abrBandWidthUpFactor;
+
       if (bufferStarvationDelay === 0) {
         // in case buffer is empty, let's check if previous fragment was loaded to perform a bitrate test
         let bitrateTestDelay = this.bitrateTestDelay;
@@ -279,10 +291,11 @@ class AbrController extends EventHandler {
         continue;
       }
 
-      let levelDetails = levelInfo.details,
-        avgDuration = levelDetails ? levelDetails.totalduration / levelDetails.fragments.length : currentFragDuration,
-        live = levelDetails ? levelDetails.live : false,
-        adjustedbw;
+      const levelDetails = levelInfo.details;
+      const avgDuration = levelDetails ? levelDetails.totalduration / levelDetails.fragments.length : currentFragDuration;
+      const live = levelDetails ? levelDetails.live : false;
+
+      let adjustedbw;
       // follow algorithm captured from stagefright :
       // https://android.googlesource.com/platform/frameworks/av/+/master/media/libstagefright/httplive/LiveSession.cpp
       // Pick the highest bandwidth stream below or equal to estimated bandwidth.
@@ -295,8 +308,8 @@ class AbrController extends EventHandler {
         adjustedbw = bwUpFactor * currentBw;
       }
 
-      const bitrate = levels[i].realBitrate ? Math.max(levels[i].realBitrate, levels[i].bitrate) : levels[i].bitrate,
-        fetchDuration = bitrate * avgDuration / adjustedbw;
+      const bitrate = levels[i].realBitrate ? Math.max(levels[i].realBitrate, levels[i].bitrate) : levels[i].bitrate;
+      const fetchDuration = bitrate * avgDuration / adjustedbw;
 
       logger.trace(`level/adjustedbw/bitrate/avgDuration/maxFetchDuration/fetchDuration: ${i}/${Math.round(adjustedbw)}/${bitrate}/${avgDuration}/${maxFetchDuration}/${fetchDuration}`);
       // if adjusted bw is greater than level bitrate AND
@@ -304,7 +317,7 @@ class AbrController extends EventHandler {
       // fragment fetchDuration unknown OR live stream OR fragment fetchDuration less than max allowed fetch duration, then this level matches
       // we don't account for max Fetch Duration for live streams, this is to avoid switching down when near the edge of live sliding window ...
       // special case to support startLevel = -1 (bitrateTest) on live streams : in that case we should not exit loop so that _findBestLevel will return -1
-        (!fetchDuration || (live && !this.bitrateTestDelay) || fetchDuration < maxFetchDuration)) {
+        (!fetchDuration || (live && !this.bitrateTestDelay) || fetchDuration < maxFetchDuration)) {
         // as we are looping from highest to lowest, this will return the best achievable quality level
         return i;
       }
diff --git a/src/hls.js b/src/hls.js
index 48b95825965..01bf34a03b9 100644
--- a/src/hls.js
+++ b/src/hls.js
@@ -101,11 +101,11 @@ export default class Hls extends Observer {
       config[prop] = defaultConfig[prop];
     }
 
-    if (config.liveMaxLatencyDurationCount !== undefined && config.liveMaxLatencyDurationCount <= config.liveSyncDurationCount) {
+    if (config.liveMaxLatencyDurationCount !== void 0 && config.liveMaxLatencyDurationCount <= config.liveSyncDurationCount) {
       throw new Error('Illegal hls.js config: "liveMaxLatencyDurationCount" must be gt "liveSyncDurationCount"');
     }
 
-    if (config.liveMaxLatencyDuration !== undefined && (config.liveMaxLatencyDuration <= config.liveSyncDuration || config.liveSyncDuration === undefined)) {
+    if (config.liveMaxLatencyDuration !== void 0 && (config.liveMaxLatencyDuration <= config.liveSyncDuration || config.liveSyncDuration === void 0)) {
       throw new Error('Illegal hls.js config: "liveMaxLatencyDuration" must be gt "liveSyncDuration"');
     }
 
@@ -118,11 +118,11 @@ export default class Hls extends Observer {
     /**
      * @member {AbrController} abrController
      */
-    const abrController = this.abrController = new config.abrController(this);
+    const abrController = this.abrController = new config.abrController(this); // eslint-disable-line new-cap
 
-    const bufferController = new config.bufferController(this);
-    const capLevelController = new config.capLevelController(this);
-    const fpsController = new config.fpsController(this);
+    const bufferController = new config.bufferController(this); // eslint-disable-line new-cap
+    const capLevelController = new config.capLevelController(this); // eslint-disable-line new-cap
+    const fpsController = new config.fpsController(this); // eslint-disable-line new-cap
     const playListLoader = new PlaylistLoader(this);
     const fragmentLoader = new FragmentLoader(this);
     const keyLoader = new KeyLoader(this);
@@ -492,7 +492,10 @@ export default class Hls extends Observer {
    * @type {number}
    */
   get minAutoLevel () {
-    let hls = this, levels = hls.levels, minAutoBitrate = hls.config.minAutoBitrate, len = levels ? levels.length : 0;
+    const hls = this;
+    const levels = hls.levels;
+    const minAutoBitrate = hls.config.minAutoBitrate;
+    const len = levels ? levels.length : 0;
     for (let i = 0; i < len; i++) {
       const levelNextBitrate = levels[i].realBitrate ? Math.max(levels[i].realBitrate, levels[i].bitrate) : levels[i].bitrate;
       if (levelNextBitrate > minAutoBitrate) {

From 5519a2c83dc2a30c64a4eed8143cae1ac926fa79 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Mon, 4 Feb 2019 23:35:32 -0400
Subject: [PATCH 46/59] Allow console statement in test bench and saucelabs
 code.

---
 src/utils/logger.js                | 4 ++--
 tests/functional/auto/setup.js     | 3 +++
 tests/functional/auto/testbench.js | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/utils/logger.js b/src/utils/logger.js
index 83542df366b..092a66a7995 100644
--- a/src/utils/logger.js
+++ b/src/utils/logger.js
@@ -49,7 +49,7 @@ function exportLoggerFunctions (debugConfig, ...functions) {
   });
 }
 
-export var enableLogs = function (debugConfig) {
+export const enableLogs = function (debugConfig) {
   // check that console is available
   if ((global.console && debugConfig === true) || typeof debugConfig === 'object') {
     exportLoggerFunctions(debugConfig,
@@ -73,4 +73,4 @@ export var enableLogs = function (debugConfig) {
   }
 };
 
-export var logger = exportedLogger;
+export const logger = exportedLogger;
diff --git a/tests/functional/auto/setup.js b/tests/functional/auto/setup.js
index 511620edbbe..bb28d5aa004 100644
--- a/tests/functional/auto/setup.js
+++ b/tests/functional/auto/setup.js
@@ -1,5 +1,8 @@
+/* eslint-disable no-console */
+
 const webdriver = require('selenium-webdriver');
 // requiring this automatically adds the chromedriver binary to the PATH
+// eslint-disable-next-line
 const chromedriver = require('chromedriver');
 const HttpServer = require('http-server');
 const streams = require('../../test-streams');
diff --git a/tests/functional/auto/testbench.js b/tests/functional/auto/testbench.js
index be509029e7e..1c8b67bfb48 100644
--- a/tests/functional/auto/testbench.js
+++ b/tests/functional/auto/testbench.js
@@ -1,4 +1,4 @@
-/* eslint-disable no-var */
+/* eslint-disable no-var, no-console */
 
 // Browser environment state
 var video;

From 0bbb9b89b5908217eb371562be219517e81b5f41 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <1956521+itsjamie@users.noreply.github.com>
Date: Thu, 7 Feb 2019 12:51:21 -0400
Subject: [PATCH 47/59] Update webpack to use babel loader with support for TS.
 (#2119)

* Upgrade to webpack 4, babel 7

* Use straight git link for webworkify dep

* Use simpler git url

* Re-add globalObject workaround

* Bump karma dep versions

* Dont preprocess non-test files

* Use @babel/register over ts-node

* Update demo `const` usage.

* Use webpack debug config in Karma configuration rather than duplication.
---
 demo/main.js                     |     2 +-
 karma.conf.js                    |    64 +-
 package-lock.json                | 28509 +++++++++++++++++------------
 package.json                     |    40 +-
 src/polyfills/number-isFinite.js |     3 +
 src/polyfills/number.js          |    11 -
 tsconfig.json                    |     6 +-
 webpack.config.js                |   183 +-
 8 files changed, 16891 insertions(+), 11927 deletions(-)
 create mode 100644 src/polyfills/number-isFinite.js
 delete mode 100644 src/polyfills/number.js

diff --git a/demo/main.js b/demo/main.js
index 29432071819..c2350a00281 100644
--- a/demo/main.js
+++ b/demo/main.js
@@ -1152,7 +1152,7 @@ function onConfigPersistenceChanged(event) {
 
 function getEditorValue(options) {
   options = $.extend({ parse: false }, options || {});
-  const value = configEditor.session.getValue();
+  let value = configEditor.session.getValue();
 
   if (options.parse) {
     try {
diff --git a/karma.conf.js b/karma.conf.js
index e7b457d6582..6764e7fd79e 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,9 +1,30 @@
 // Karma configuration
 // Generated on Tue Jul 18 2017 12:17:16 GMT-0700 (PDT)
-
-const pkgJson = require('./package.json');
-const webpack = require('webpack');
 const path = require('path');
+const merge = require('webpack-merge');
+const webpackConfig = require('./webpack.config')({ debug: true })[0];
+delete webpackConfig.entry;
+delete webpackConfig.output;
+const mergeConfig = merge(webpackConfig, {
+  devtool: 'inline-source-map',
+  module: {
+    rules: [
+      {
+        test: /\.(ts|js)$/,
+        exclude: path.resolve(__dirname, 'node_modules'),
+        enforce: 'post',
+        use: [
+          {
+            loader: 'istanbul-instrumenter-loader',
+            options: {
+              esModules: true
+            }
+          }
+        ]
+      }
+    ]
+  }
+});
 
 module.exports = function (config) {
   config.set({
@@ -24,7 +45,6 @@ module.exports = function (config) {
 
     // preprocess matching files before serving them to the browser
     // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
-    // node_modules must not be webpacked or else Karma will fail to load frameworks
     preprocessors: {
       'tests/index.js': ['webpack', 'sourcemap']
     },
@@ -39,41 +59,7 @@ module.exports = function (config) {
       fixWebpackSourcePaths: true
     },
 
-    webpack: {
-      mode: 'development',
-      devtool: 'inline-source-map',
-      resolve: {
-        extensions: ['.ts', '.js']
-      },module: {
-        rules: [
-          {
-            test: /\.(ts|js)$/,
-            include: path.resolve(__dirname, 'src'),
-            exclude: path.resolve(__dirname, 'node_modules'),
-            loader: 'ts-loader'
-          },// instrument only testing sources with Istanbul
-          {
-            test: /\.(ts|js)$/,
-
-            exclude: path.resolve(__dirname, 'node_modules'),enforce: 'post',
-            use: [
-              {
-                loader: 'istanbul-instrumenter-loader',
-                options: { esModules: true }
-              }
-            ]
-          }
-        ]
-      },
-      plugins: [
-        new webpack.DefinePlugin({
-          __VERSION__: JSON.stringify(pkgJson.version),
-          __USE_SUBTITLES__: JSON.stringify(true),
-          __USE_ALT_AUDIO__: JSON.stringify(true),
-          __USE_EME_DRM__: JSON.stringify(true)
-        })
-      ]
-    },
+    webpack: mergeConfig,
 
     // web server port
     port: 9876,
diff --git a/package-lock.json b/package-lock.json
index 91ac0cc4502..0f2ca282805 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,45 +9,193 @@
       "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "7.0.0"
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/core": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.2.0.tgz",
+      "integrity": "sha512-7pvAdC4B+iKjFFp9Ztj0QgBndJ++qaMeonT185wAqUnhipw8idm9Rv1UMyBuKtYjfl6ORNkgEgcsYLfHX/GpLw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.2.0",
+        "@babel/helpers": "^7.2.0",
+        "@babel/parser": "^7.2.0",
+        "@babel/template": "^7.1.2",
+        "@babel/traverse": "^7.1.6",
+        "@babel/types": "^7.2.0",
+        "convert-source-map": "^1.1.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.10",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
       }
     },
     "@babel/generator": {
-      "version": "7.3.0",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.0.tgz",
-      "integrity": "sha512-dZTwMvTgWfhmibq4V9X+LMf6Bgl7zAodRn9PvcPdhlzFMbvUutx74dbEv7Atz3ToeEpevYEJtAwfxq/bDCzHWg==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.2.0.tgz",
+      "integrity": "sha512-BA75MVfRlFQG2EZgFYIwyT1r6xSkwfP2bdkY/kLZusEYWiJs4xCowab/alaEaT0wSvmVuXGqiefeBlP+7V1yKg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.2.0",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.10",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      }
+    },
+    "@babel/helper-annotate-as-pure": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz",
+      "integrity": "sha512-3UYcJUj9kvSLbLbUIfQTqzcy5VX7GRZ/CCDrnOaZorFFM01aXp1+GJwuFGV4NDDoAS+mOUyHcO6UD/RfqOks3Q==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-builder-binary-assignment-operator-visitor": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.1.0.tgz",
+      "integrity": "sha512-qNSR4jrmJ8M1VMM9tibvyRAHXQs2PmaksQF7c1CGJNipfe3D8p+wgNwgso/P2A2r2mdgBWAXljNWR0QRZAMW8w==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-explode-assignable-expression": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-call-delegate": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-call-delegate/-/helper-call-delegate-7.1.0.tgz",
+      "integrity": "sha512-YEtYZrw3GUK6emQHKthltKNZwszBcHK58Ygcis+gVUrF4/FmTVr5CCqQNSfmvg2y+YDEANyYoaLz/SHsnusCwQ==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-hoist-variables": "^7.0.0",
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-create-class-features-plugin": {
+      "version": "7.3.2",
+      "resolved": "https://registry.npmjs.org/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.3.2.tgz",
+      "integrity": "sha512-tdW8+V8ceh2US4GsYdNVNoohq5uVwOf9k6krjwW4E1lINcHgttnWcNqgdoessn12dAy8QkbezlbQh2nXISNY+A==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.3.0",
-        "jsesc": "2.5.2",
-        "lodash": "4.17.11",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-member-expression-to-functions": "^7.0.0",
+        "@babel/helper-optimise-call-expression": "^7.0.0",
+        "@babel/helper-plugin-utils": "^7.0.0",
+        "@babel/helper-replace-supers": "^7.2.3"
       },
       "dependencies": {
-        "jsesc": {
-          "version": "2.5.2",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
-          "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
-          "dev": true
+        "@babel/generator": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.2.tgz",
+          "integrity": "sha512-f3QCuPppXxtZOEm5GWPra/uYUjmNQlu9pbAD8D/9jze4pTY83rTtB1igTBSwvkeNlC5gR24zFFkz+2WHLFQhqQ==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.3.2",
+            "jsesc": "^2.5.1",
+            "lodash": "^4.17.10",
+            "source-map": "^0.5.0",
+            "trim-right": "^1.0.1"
+          },
+          "dependencies": {
+            "@babel/types": {
+              "version": "7.3.2",
+              "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.3.2.tgz",
+              "integrity": "sha512-3Y6H8xlUlpbGR+XvawiH0UXehqydTmNmEpozWcXymqwcrwYAl5KMvKtQ+TF6f6E08V6Jur7v/ykdDSF+WDEIXQ==",
+              "dev": true,
+              "requires": {
+                "esutils": "^2.0.2",
+                "lodash": "^4.17.10",
+                "to-fast-properties": "^2.0.0"
+              }
+            }
+          }
         },
-        "lodash": {
-          "version": "4.17.11",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+        "@babel/helper-replace-supers": {
+          "version": "7.2.3",
+          "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.2.3.tgz",
+          "integrity": "sha512-GyieIznGUfPXPWu0yLS6U55Mz67AZD9cUk0BfirOWlPrXlBcan9Gz+vHGz+cPfuoweZSnPzPIm67VtQM0OWZbA==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-member-expression-to-functions": "^7.0.0",
+            "@babel/helper-optimise-call-expression": "^7.0.0",
+            "@babel/traverse": "^7.2.3",
+            "@babel/types": "^7.0.0"
+          }
+        },
+        "@babel/parser": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.3.2.tgz",
+          "integrity": "sha512-QzNUC2RO1gadg+fs21fi0Uu0OuGNzRKEmgCxoLNzbCdoprLwjfmZwzUrpUNfJPaVRwBpDY47A17yYEGWyRelnQ==",
           "dev": true
+        },
+        "@babel/traverse": {
+          "version": "7.2.3",
+          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.2.3.tgz",
+          "integrity": "sha512-Z31oUD/fJvEWVR0lNZtfgvVt512ForCTNKYcJBGbPb1QZfve4WGH8Wsy7+Mev33/45fhP/hwQtvgusNdcCMgSw==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.0.0",
+            "@babel/generator": "^7.2.2",
+            "@babel/helper-function-name": "^7.1.0",
+            "@babel/helper-split-export-declaration": "^7.0.0",
+            "@babel/parser": "^7.2.3",
+            "@babel/types": "^7.2.2",
+            "debug": "^4.1.0",
+            "globals": "^11.1.0",
+            "lodash": "^4.17.10"
+          },
+          "dependencies": {
+            "@babel/types": {
+              "version": "7.3.2",
+              "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.3.2.tgz",
+              "integrity": "sha512-3Y6H8xlUlpbGR+XvawiH0UXehqydTmNmEpozWcXymqwcrwYAl5KMvKtQ+TF6f6E08V6Jur7v/ykdDSF+WDEIXQ==",
+              "dev": true,
+              "requires": {
+                "esutils": "^2.0.2",
+                "lodash": "^4.17.10",
+                "to-fast-properties": "^2.0.0"
+              }
+            }
+          }
         }
       }
     },
+    "@babel/helper-define-map": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-define-map/-/helper-define-map-7.1.0.tgz",
+      "integrity": "sha512-yPPcW8dc3gZLN+U1mhYV91QU3n5uTbx7DUdf8NnPbjS0RMwBuHi9Xt2MUgppmNz7CJxTBWsGczTiEp1CSOTPRg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/types": "^7.0.0",
+        "lodash": "^4.17.10"
+      }
+    },
+    "@babel/helper-explode-assignable-expression": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-explode-assignable-expression/-/helper-explode-assignable-expression-7.1.0.tgz",
+      "integrity": "sha512-NRQpfHrJ1msCHtKjbzs9YcMmJZOg6mQMmGRB+hbamEdG5PNpaSm95275VD92DvJKuyl0s2sFiDmMZ+EnnvufqA==",
+      "dev": true,
+      "requires": {
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
     "@babel/helper-function-name": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
       "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
       "dev": true,
       "requires": {
-        "@babel/helper-get-function-arity": "7.0.0",
-        "@babel/template": "7.2.2",
-        "@babel/types": "7.3.0"
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
       }
     },
     "@babel/helper-get-function-arity": {
@@ -56,7 +204,107 @@
       "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "7.3.0"
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-hoist-variables": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.0.0.tgz",
+      "integrity": "sha512-Ggv5sldXUeSKsuzLkddtyhyHe2YantsxWKNi7A+7LeD12ExRDWTRk29JCXpaHPAbMaIPZSil7n+lq78WY2VY7w==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-member-expression-to-functions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.0.0.tgz",
+      "integrity": "sha512-avo+lm/QmZlv27Zsi0xEor2fKcqWG56D5ae9dzklpIaY7cQMK5N8VSpaNVPPagiqmy7LrEjK1IWdGMOqPu5csg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-module-imports": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz",
+      "integrity": "sha512-aP/hlLq01DWNEiDg4Jn23i+CXxW/owM4WpDLFUbpjxe4NS3BhLVZQ5i7E0ZrxuQ/vwekIeciyamgB1UIYxxM6A==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-module-transforms": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.1.0.tgz",
+      "integrity": "sha512-0JZRd2yhawo79Rcm4w0LwSMILFmFXjugG3yqf+P/UsKsRS1mJCmMwwlHDlMg7Avr9LrvSpp4ZSULO9r8jpCzcw==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-module-imports": "^7.0.0",
+        "@babel/helper-simple-access": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0",
+        "lodash": "^4.17.10"
+      }
+    },
+    "@babel/helper-optimise-call-expression": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.0.0.tgz",
+      "integrity": "sha512-u8nd9NQePYNQV8iPWu/pLLYBqZBa4ZaY1YWRFMuxrid94wKI1QNt67NEZ7GAe5Kc/0LLScbim05xZFWkAdrj9g==",
+      "dev": true,
+      "requires": {
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-        "safe-buffer": "5.1.1",
-        "ultron": "1.1.1"
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
       }
     },
-    "xdg-basedir": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
-      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
-      "dev": true
-    },
     "xml-name-validator": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-2.0.1.tgz",
@@ -15614,18 +20581,18 @@
     },
     "xml2js": {
       "version": "0.4.19",
-      "resolved": "http://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
-      "integrity": "sha1-aGwg8hMgnpSr8NG88e+qKRx4J6c=",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
+      "integrity": "sha512-esZnJZJOiJR9wWKMyuvSE1y6Dq5LCuJanqhxslH2bxM6duahNZ+HMpCLhBQGZkbX6xRf8x1Y2eJlgt2q3qo49Q==",
       "dev": true,
       "requires": {
-        "sax": "1.2.4",
-        "xmlbuilder": "9.0.4"
+        "sax": ">=0.6.0",
+        "xmlbuilder": "~9.0.1"
       }
     },
     "xmlbuilder": {
-      "version": "9.0.4",
-      "resolved": "http://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.4.tgz",
-      "integrity": "sha1-UZy0ymhtAFqEINNJbz8MruzKWA8=",
+      "version": "9.0.7",
+      "resolved": "http://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
+      "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0=",
       "dev": true
     },
     "xmlhttprequest-ssl": {
@@ -15653,40 +20620,79 @@
       "dev": true
     },
     "yargs": {
-      "version": "3.10.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
-      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
-        "window-size": "0.1.0"
-      }
-    },
-    "yargs-parser": {
-      "version": "10.1.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
-      "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
-      "dev": true,
-      "requires": {
-        "camelcase": "4.1.0"
+      "version": "12.0.5",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+      "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^4.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^3.0.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1 || ^4.0.0",
+        "yargs-parser": "^11.1.1"
       },
       "dependencies": {
-        "camelcase": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
-          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.0.0.tgz",
+          "integrity": "sha512-fl5s52lI5ahKCernzzIyAP0QAZbGIovtVHGwpcu1Jr/EpzLVDI2myISHwGqK7m8uQFugVWSrbxH7XnhGtvEc+A==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.0.0.tgz",
+          "integrity": "sha512-hMp0onDKIajHfIkdRk3P4CdCmErkYAxxDtP3Wx/4nZ3aGlau2VKh3mZpcuFkH27WQkL/3WBCPOktzA9ZOAnMQQ==",
           "dev": true
         }
       }
     },
-    "yarn": {
-      "version": "1.12.3",
-      "resolved": "https://registry.npmjs.org/yarn/-/yarn-1.12.3.tgz",
-      "integrity": "sha512-8f5rWNDvkhAmCxmn8C0LsNWMxTYVk4VGKiq0sIB6HGZjaZTHsGIH87SUmVDUEd2Wk54bqKoUlbVWgQFCQhRkVw==",
-      "dev": true
+    "yargs-parser": {
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
     },
     "yauzl": {
       "version": "2.4.1",
@@ -15694,7 +20700,7 @@
       "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
       "dev": true,
       "requires": {
-        "fd-slicer": "1.0.1"
+        "fd-slicer": "~1.0.1"
       }
     },
     "yeast": {
@@ -15702,23 +20708,6 @@
       "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
       "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk=",
       "dev": true
-    },
-    "yn": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
-      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
-      "dev": true
-    },
-    "zip-stream": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-2.0.1.tgz",
-      "integrity": "sha512-c+eUhhkDpaK87G/py74wvWLtz2kzMPNCCkUApkun50ssE0oQliIQzWpTnwjB+MTKVIf2tGzIgHyqW/Y+W77ecQ==",
-      "dev": true,
-      "requires": {
-        "archiver-utils": "2.0.0",
-        "compress-commons": "1.2.2",
-        "readable-stream": "2.3.3"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index 5ccf2f612a0..08808f52dbf 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "build": "webpack --progress",
     "build:debug": "webpack --progress --env.debug",
     "build:watch": "webpack --progress --env.debug --watch",
-    "build:analyze": "ANALYZE=true webpack --progress",
+    "build:types": "tsc --emitDeclarationOnly",
     "dev": "webpack-dev-server --progress --env.debug --port 8000",
     "docs": "esdoc",
     "lint": "./scripts/lint.sh",
@@ -31,13 +31,24 @@
     "test": "npm run test:unit && npm run test:func",
     "test:unit": "karma start karma.conf.js",
     "test:unit:watch": "karma start karma.conf.js --auto-watch --no-single-run",
-    "test:func": "mocha --require ts-node/register tests/functional/auto/setup.js --timeout 40000 --exit"
+    "test:func": "BABEL_ENV=development mocha --require @babel/register tests/functional/auto/setup.js --timeout 40000 --exit",
+    "type-check": "tsc --noEmit",
+    "type-check:watch": "npm run type-check -- --watch"
   },
   "dependencies": {
     "eventemitter3": "3.1.0",
     "url-toolkit": "^2.1.6"
   },
   "devDependencies": {
+    "@babel/core": "7.2.0",
+    "@babel/helper-module-imports": "7.0.0",
+    "@babel/plugin-proposal-class-properties": "^7.3.0",
+    "@babel/plugin-proposal-object-rest-spread": "^7.3.2",
+    "@babel/preset-env": "7.2.0",
+    "@babel/preset-typescript": "^7.1.0",
+    "@babel/register": "^7.0.0",
+    "arraybuffer-equal": "^1.0.4",
+    "babel-loader": "8.0.4",
     "chai": "4.2.0",
     "chromedriver": "^2.38.3",
     "esdoc": "^1.1.0",
@@ -51,34 +62,29 @@
     "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-standard": "^3.0.1",
     "eslint-plugin-typescript": "^0.12.0",
-    "git-commit-info": "^1.0.0",
-    "git-tag-version": "^1.2.0",
     "http-server": "^0.11.0",
     "husky": "^0.14.3",
     "istanbul-instrumenter-loader": "^3.0.1",
     "karma": "3.1.3",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage-istanbul-reporter": "2.0.4",
-    "karma-mocha": "1.3.0",
-    "karma-mocha-reporter": "2.2.5",
-    "karma-sinon": "1.0.5",
-    "karma-sinon-chai": "2.0.2",
+    "karma-mocha": "^1.3.0",
+    "karma-mocha-reporter": "^2.2.5",
+    "karma-sinon": "^1.0.5",
+    "karma-sinon-chai": "^2.0.2",
     "karma-sourcemap-loader": "^0.3.7",
-    "karma-webpack": "3.0.5",
-    "mocha": "5.2.0",
+    "karma-webpack": "^3.0.5",
+    "mocha": "^5.2.0",
     "netlify-cli": "^2.5.1",
     "selenium-webdriver": "^3.1.0",
     "sinon": "7.1.1",
     "sinon-chai": "3.3.0",
-    "ts-loader": "^4.4.2",
-    "ts-node": "^6.1.0",
-    "typescript": "^2.9.1",
+    "typescript": "^3.3.1",
     "typescript-eslint-parser": "^21.0.2",
-    "webpack": "^4.11.1",
-    "webpack-bundle-analyzer": "^2.9.1",
-    "webpack-cli": "^3.0.2",
+    "webpack": "^4.27.1",
+    "webpack-cli": "^3.1.2",
     "webpack-dev-server": "^3.1.4",
     "webpack-merge": "^4.2.1",
-    "webworkify-webpack": "^2.1.2"
+    "webworkify-webpack": "johnBartos/webworkify-webpack#refs/heads/master"
   }
 }
diff --git a/src/polyfills/number-isFinite.js b/src/polyfills/number-isFinite.js
new file mode 100644
index 00000000000..5d2885c6660
--- /dev/null
+++ b/src/polyfills/number-isFinite.js
@@ -0,0 +1,3 @@
+export const isFiniteNumber = Number.isFinite || function (value) {
+  return typeof value === 'number' && isFinite(value);
+};
diff --git a/src/polyfills/number.js b/src/polyfills/number.js
deleted file mode 100644
index d528a4781a9..00000000000
--- a/src/polyfills/number.js
+++ /dev/null
@@ -1,11 +0,0 @@
-import { getSelfScope } from '../utils/get-self-scope';
-
-const self = getSelfScope();
-const Number = self.Number;
-
-// TODO: get rid of global polyfills and replace them with wrappers ("ponyfills")
-Number.isFinite = Number.isFinite || function (value) {
-  return typeof value === 'number' && isFinite(value);
-};
-
-export { Number };
diff --git a/tsconfig.json b/tsconfig.json
index 9d6fc6833c9..a38a008c034 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,9 +1,9 @@
 {
   "compilerOptions": {
-    "sourceMap": true,
-    "allowJs": true,
+    "target": "esnext",
     "module": "commonjs",
-    "target": "ES5",
+    "declaration": true,
+    "sourceMap": true,
     "strict": false,
     "strictNullChecks": true,
     "strictPropertyInitialization": true,
diff --git a/webpack.config.js b/webpack.config.js
index c37197aa197..0f1e4892385 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -2,11 +2,7 @@ const pkgJson = require('./package.json');
 const path = require('path');
 const webpack = require('webpack');
 const merge = require('webpack-merge');
-
-const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
-
-const getGitVersion = require('git-tag-version');
-const getGitCommitInfo = require('git-commit-info');
+const importHelper = require('@babel/helper-module-imports');
 
 /* Allow to customise builds through env-vars */
 const env = process.env;
@@ -14,11 +10,32 @@ const env = process.env;
 const addSubtitleSupport = !!env.SUBTITLE || !!env.USE_SUBTITLES;
 const addAltAudioSupport = !!env.ALT_AUDIO || !!env.USE_ALT_AUDIO;
 const addEMESupport = !!env.EME_DRM || !!env.USE_EME_DRM;
-const runAnalyzer = !!env.ANALYZE;
+
+const createDefinePlugin = (type) => {
+  const buildConstants = {
+    __VERSION__: JSON.stringify(pkgJson.version),
+    __USE_SUBTITLES__: JSON.stringify(type === 'main' || addSubtitleSupport),
+    __USE_ALT_AUDIO__: JSON.stringify(type === 'main' || addAltAudioSupport),
+    __USE_EME_DRM__: JSON.stringify(type === 'main' || addEMESupport)
+  };
+  return new webpack.DefinePlugin(buildConstants);
+};
+
+const basePlugins = [
+  new webpack.optimize.ModuleConcatenationPlugin(),
+  new webpack.optimize.OccurrenceOrderPlugin(),
+  new webpack.BannerPlugin({ entryOnly: true, raw: true, banner: 'typeof window !== "undefined" &&' }) // SSR/Node.js guard
+];
+const mainPlugins = [...basePlugins, createDefinePlugin('main')];
+const lightPlugins = [...basePlugins, createDefinePlugin('light')];
 
 const baseConfig = {
   mode: 'development',
   entry: './src/hls',
+  node: false,
+  optimization: {
+    splitChunks: false
+  },
   resolve: {
     // Add `.ts` as a resolvable extension.
     extensions: ['.ts', '.js']
@@ -26,80 +43,52 @@ const baseConfig = {
   module: {
     strictExportPresence: true,
     rules: [
-      // all files with a `.ts` extension will be handled by `ts-loader`
       {
         test: /\.(ts|js)$/,
-        loader: 'ts-loader',
-        exclude: /node_modules/
+        exclude: [
+          path.resolve(__dirname, 'node_modules')
+        ],
+        loader: 'babel-loader',
+        options: {
+          babelrc: false,
+          presets: [
+            '@babel/preset-typescript',
+            ['@babel/preset-env', {
+              loose: true,
+              modules: false,
+              targets: {
+                browsers: [
+                  'chrome >= 47',
+                  'firefox >= 51',
+                  'ie >= 11',
+                  'safari >= 8',
+                  'ios >= 8',
+                  'android >= 4'
+                ]
+              }
+            }]
+          ],
+          plugins: [
+            ['@babel/plugin-proposal-class-properties', {
+              loose: true
+            }],
+            '@babel/plugin-proposal-object-rest-spread',
+            {
+              visitor: {
+                CallExpression: function (espath) {
+                  if (espath.get('callee').matchesPattern('Number.isFinite')) {
+                    espath.node.callee = importHelper.addNamed(espath, 'isFiniteNumber', path.resolve('src/polyfills/number-isFinite'));
+                  }
+                }
+              }
+            }
+          ]
+        }
       }
     ]
   }
 };
 
-const demoConfig = merge(baseConfig, {
-  name: 'demo',
-  mode: 'development',
-  entry: './demo/main',
-  output: {
-    filename: 'hls-demo.js',
-    chunkFilename: '[name].js',
-    sourceMapFilename: 'hls-demo.js.map',
-    path: path.resolve(__dirname, 'dist'),
-    publicPath: '/dist/',
-    library: 'HlsDemo',
-    libraryTarget: 'umd',
-    libraryExport: 'default',
-    globalObject: 'this' // https://github.com/webpack/webpack/issues/6642#issuecomment-370222543
-  },
-  optimization: {
-    minimize: false
-  },
-  plugins: [],
-  devtool: 'source-map'
-});
-
-function getPluginsForConfig (type, minify = false) {
-  // common plugins.
-
-  const defineConstants = getConstantsForConfig(type);
-
-  // console.log('DefinePlugin constants:', JSON.stringify(defineConstants, null, 2))
-
-  const plugins = [
-    new webpack.BannerPlugin({ entryOnly: true, raw: true, banner: 'typeof window !== "undefined" &&' }), // SSR/Node.js guard
-    new webpack.optimize.OccurrenceOrderPlugin(),
-    new webpack.DefinePlugin(defineConstants),
-    new webpack.ProvidePlugin({
-      Number: [path.resolve('./src/polyfills/number'), 'Number']
-    })
-  ];
-
-  if (runAnalyzer && !minify) {
-    plugins.push(new BundleAnalyzerPlugin({
-      analyzerMode: 'static',
-      reportFilename: `bundle-analyzer-report.${type}.html`
-    }));
-  } else {
-    // https://github.com/webpack-contrib/webpack-bundle-analyzer/issues/115
-    plugins.push(new webpack.optimize.ModuleConcatenationPlugin());
-  }
-
-  return plugins;
-}
-
-function getConstantsForConfig (type) {
-  const gitCommitInfo = getGitCommitInfo();
-  const suffix = gitCommitInfo.shortCommit ? ('-' + gitCommitInfo.shortCommit) : '';
-
-  // By default the "main" dists (hls.js & hls.min.js) are full-featured.
-  return {
-    __VERSION__: JSON.stringify(pkgJson.version || (getGitVersion() + suffix)),
-    __USE_SUBTITLES__: JSON.stringify(type === 'main' || addSubtitleSupport),
-    __USE_ALT_AUDIO__: JSON.stringify(type === 'main' || addAltAudioSupport),
-    __USE_EME_DRM__: JSON.stringify(type === 'main' || addEMESupport)
-  };
-}
-
 function getAliasesForLightDist () {
   let aliases = {};
 
@@ -141,9 +130,9 @@ const multiConfig = [
       library: 'Hls',
       libraryTarget: 'umd',
       libraryExport: 'default',
-      globalObject: 'this'
+      globalObject: 'this' // https://github.com/webpack/webpack/issues/6642#issuecomment-370222543
     },
-    plugins: getPluginsForConfig('main'),
+    plugins: mainPlugins,
     devtool: 'source-map'
   },
   {
@@ -159,10 +148,7 @@ const multiConfig = [
       libraryExport: 'default',
       globalObject: 'this'
     },
-    plugins: getPluginsForConfig('main', true),
-    optimization: {
-      minimize: true
-    },
+    plugins: mainPlugins,
     devtool: 'source-map'
   },
   {
@@ -182,7 +168,7 @@ const multiConfig = [
     resolve: {
       alias: getAliasesForLightDist()
     },
-    plugins: getPluginsForConfig('light'),
+    plugins: lightPlugins,
     devtool: 'source-map'
   },
   {
@@ -201,42 +187,47 @@ const multiConfig = [
     resolve: {
       alias: getAliasesForLightDist()
     },
-    plugins: getPluginsForConfig('light', true),
-    optimization: {
-      minimize: true
+    plugins: lightPlugins,
+    devtool: 'source-map'
+  },
+  {
+    name: 'demo',
+    entry: './demo/main',
+    mode: 'development',
+    output: {
+      filename: 'hls-demo.js',
+      chunkFilename: '[name].js',
+      sourceMapFilename: 'hls-demo.js.map',
+      path: path.resolve(__dirname, 'dist'),
+      publicPath: '/dist/',
+      library: 'HlsDemo',
+      libraryTarget: 'umd',
+      libraryExport: 'default',
+      globalObject: 'this' // https://github.com/webpack/webpack/issues/6642#issuecomment-370222543
     },
+    plugins: mainPlugins,
     devtool: 'source-map'
   }
 ].map(config => merge(baseConfig, config));
 
-multiConfig.push(demoConfig);
-
 // webpack matches the --env arguments to a string; for example, --env.debug.min translates to { debug: true, min: true }
 module.exports = (envArgs) => {
   let configs;
-
   if (!envArgs) {
     // If no arguments are specified, return every configuration
     configs = multiConfig;
   } else {
     // Find the first enabled config within the arguments array
     const enabledConfigName = Object.keys(envArgs).find(envName => envArgs[envName]);
-
     // Filter out config with name
     const enabledConfig = multiConfig.find(config => config.name === enabledConfigName);
-
     if (!enabledConfig) {
-      console.error(`Couldn't find a valid config with the name "${enabledConfigName}". Known configs are: ${multiConfig.map(config => config.name).join(', ')}`);
-
-      throw new Error('Hls.js webpack config: Invalid environment parameters');
+      throw new Error(`Couldn't find a valid config with the name "${enabledConfigName}". Known configs are: ${multiConfig.map(config => config.name).join(', ')}`);
     }
 
-    configs = [enabledConfig, demoConfig];
+    configs = [enabledConfig];
   }
 
-  console.log(
-    `Building configs: ${configs.map(config => config.name).join(', ')}.\n`
-  );
-
+  console.log(`Building configs: ${configs.map(config => config.name).join(', ')}.\n`);
   return configs;
 };

From ff0aa545baca0e9a355e513676680f54d21b4147 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Mon, 11 Feb 2019 09:32:55 -0400
Subject: [PATCH 48/59] Basic typescript of event handler.

---
 src/{event-handler.js => event-handler.ts} | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)
 rename src/{event-handler.js => event-handler.ts} (89%)

diff --git a/src/event-handler.js b/src/event-handler.ts
similarity index 89%
rename from src/event-handler.js
rename to src/event-handler.ts
index d41a41158b0..964f62eade2 100644
--- a/src/event-handler.js
+++ b/src/event-handler.ts
@@ -15,7 +15,11 @@ const FORBIDDEN_EVENT_NAMES = {
 };
 
 class EventHandler {
-  constructor (hls, ...events) {
+  hls: any;
+  handledEvents: any[];
+  useGenericHandler: boolean;
+
+  constructor (hls: any, ...events: any[]) {
     this.hls = hls;
     this.onEvent = this.onEvent.bind(this);
     this.handledEvents = events;
@@ -60,12 +64,12 @@ class EventHandler {
   /**
    * arguments: event (string), data (any)
    */
-  onEvent (event, data) {
+  onEvent (event: string, data: any) {
     this.onEventGeneric(event, data);
   }
 
-  onEventGeneric (event, data) {
-    let eventToFunction = function (event, data) {
+  onEventGeneric (event: string, data: any) {
+    let eventToFunction = function (event: string, data: any) {
       let funcName = 'on' + event.replace('hls', '');
       if (typeof this[funcName] !== 'function') {
         throw new Error(`Event ${event} has no generic handler in this ${this.constructor.name} class (tried ${funcName})`);

From 48f64de1a9ef59267c5f253a8339e1f513ae7426 Mon Sep 17 00:00:00 2001
From: Alexey Gusev <mad.gooze@gmail.com>
Date: Mon, 11 Feb 2019 18:45:03 +0300
Subject: [PATCH 49/59] remove events/EventEmitter && move Observer to ts
 (#2097)

* remove events/EventEmitter && move Observer to ts

* disable node modules in webpack
---
 docs/design.md                          |  2 +-
 src/demux/demuxer-worker.js             |  2 +-
 src/demux/demuxer.js                    |  2 +-
 src/observer.js                         | 22 ----------------------
 src/observer.ts                         | 15 +++++++++++++++
 tests/unit/controller/eme-controller.js |  2 +-
 webpack.config.js                       |  8 ++++++++
 7 files changed, 27 insertions(+), 26 deletions(-)
 delete mode 100644 src/observer.js
 create mode 100644 src/observer.ts

diff --git a/docs/design.md b/docs/design.md
index 084b596e272..c32455e12ec 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -5,7 +5,7 @@ design idea is pretty simple :
    - main functionalities are split into several subsystems
    - all subsystems are instantiated by the Hls instance.
    - each subsystem heavily relies on events for internal/external communications.
-   - Events are handled using [EventEmitter](https://nodejs.org/api/events.html)
+   - Events are handled using [EventEmitter3](https://github.com/primus/eventemitter3)
    - bundled for the browser by [webpack](https://webpack.js.org/)
 
 ## Code structure
diff --git a/src/demux/demuxer-worker.js b/src/demux/demuxer-worker.js
index e0710d6ec82..08bc7afee5a 100644
--- a/src/demux/demuxer-worker.js
+++ b/src/demux/demuxer-worker.js
@@ -7,7 +7,7 @@ import DemuxerInline from '../demux/demuxer-inline';
 import Event from '../events';
 import { enableLogs } from '../utils/logger';
 
-import { EventEmitter } from 'events';
+import { EventEmitter } from 'eventemitter3';
 
 let DemuxerWorker = function (self) {
   // observer setup
diff --git a/src/demux/demuxer.js b/src/demux/demuxer.js
index 25ffa95eb68..bd261bd5c4a 100644
--- a/src/demux/demuxer.js
+++ b/src/demux/demuxer.js
@@ -1,4 +1,4 @@
-import { EventEmitter } from 'events';
+import { EventEmitter } from 'eventemitter3';
 import * as work from 'webworkify-webpack';
 
 import Event from '../events';
diff --git a/src/observer.js b/src/observer.js
deleted file mode 100644
index 75c3589ac00..00000000000
--- a/src/observer.js
+++ /dev/null
@@ -1,22 +0,0 @@
-import { EventEmitter } from 'eventemitter3';
-
-/**
- * @class
- *
- * Simple adapter sub-class of Nodejs-like EventEmitter.
- *
- * We simply want to pass along the event-name itself
- * in every call to a handler, which is the purpose of our `trigger` method
- * extending the standard API.
- *
- */
-export class Observer extends EventEmitter {
-  /**
-   *
-   * @param {string} event
-   * @param {any} data
-   */
-  trigger (event, ...data) {
-    this.emit(event, event, ...data);
-  }
-}
diff --git a/src/observer.ts b/src/observer.ts
new file mode 100644
index 00000000000..33d265eb752
--- /dev/null
+++ b/src/observer.ts
@@ -0,0 +1,15 @@
+import { EventEmitter } from 'eventemitter3';
+
+/**
+ * Simple adapter sub-class of Nodejs-like EventEmitter.
+ */
+export class Observer extends EventEmitter {
+  /**
+   * We simply want to pass along the event-name itself
+   * in every call to a handler, which is the purpose of our `trigger` method
+   * extending the standard API.
+   */
+  trigger (event: string, ...data: Array<any>): void {
+    this.emit(event, event, ...data);
+  }
+}
diff --git a/tests/unit/controller/eme-controller.js b/tests/unit/controller/eme-controller.js
index abbd3550b80..95d41d2a38e 100644
--- a/tests/unit/controller/eme-controller.js
+++ b/tests/unit/controller/eme-controller.js
@@ -1,6 +1,6 @@
 import EMEController from '../../../src/controller/eme-controller';
 import HlsMock from '../../mocks/hls.mock';
-import EventEmitter from 'events';
+import { EventEmitter } from 'eventemitter3';
 import { ErrorDetails } from '../../../src/errors';
 
 const sinon = require('sinon');
diff --git a/webpack.config.js b/webpack.config.js
index 0f1e4892385..a63bef25997 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -86,6 +86,14 @@ const baseConfig = {
         }
       }
     ]
+  },
+  node: {
+    global: false,
+    process: false,
+    __filename: false,
+    __dirname: false,
+    Buffer: false,
+    setImmediate: false
   }
 };
 

From fd7f6d311a67725a040c73ec43a45a2f759a46df Mon Sep 17 00:00:00 2001
From: Brent Smith <brentsmithis@gmail.com>
Date: Tue, 12 Feb 2019 12:13:45 -0400
Subject: [PATCH 50/59] Fixed case of 'They use hls.js in production!' header
 and updated Viacom image link to new domain and using https (#2127)

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 98b085fcc44..d94f225279b 100644
--- a/README.md
+++ b/README.md
@@ -89,7 +89,7 @@ Video is controlled through HTML ```<video>``` element.
 
 HTMLVideoElement control and events could be used seamlessly.
 
-## they use hls.js in production !
+## They use hls.js in production!
 
 |[<img src="http://i.cdn.turner.com/adultswim/big/img/global/adultswim.jpg" width="120">](http://www.adultswim.com/videos/streams)|[<img src="https://www.akamai.com/fr/fr/multimedia/images/logo/akamai-logo.png" width="120">](https://www.akamai.com)|[<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Canal%2B.svg/2000px-Canal%2B.svg.png" width="120">](https://www.canalplus.fr)|[<img src="https://avatars2.githubusercontent.com/u/115313" width="120">](http://www.dailymotion.com)|
 |---|---|---|---|
@@ -98,7 +98,7 @@ HTMLVideoElement control and events could be used seamlessly.
 |[<img src="https://cloud.githubusercontent.com/assets/1798553/20356424/ba158574-ac24-11e6-95e1-1ae591b11a0a.png" width="120">](https://www.peer5.com/)|[<img src="https://cloud.githubusercontent.com/assets/4909096/20925062/e26e6fc8-bbb4-11e6-99a5-d4762274a342.png" width="120">](http://qbrick.com/)|[<img src="https://www.radiantmediaplayer.com/images/radiantmediaplayer-new-logo-640.jpg" width="120">](https://www.radiantmediaplayer.com/)|[<img src="https://www.rts.ch/hummingbird-static/images/logos/logo_marts.svg" width="120">](http://www.rts.ch/)|
 |[<img src="https://cloud.githubusercontent.com/assets/12702747/19316434/0a3601de-9067-11e6-85e2-936b1cb099a0.png" width="120">](https://www.snapstream.com/)|[<img src="https://www.streamamg.com/wp-content/themes/barebones/_assets/images/streamamg-logo.png" width="120">](https://www.streamamg.com/)|[<img src="https://streamsharkio.sa.metacdn.com/wp-content/uploads/2015/10/streamshark-dark.svg" width="120">](https://streamshark.io/)|[<img src="https://camo.githubusercontent.com/9580f10e9bfa8aa7fba52c5cb447bee0757e33da/68747470733a2f2f7777772e7461626c6f74762e636f6d2f7374617469632f696d616765732f7461626c6f5f6c6f676f2e706e67" width="120">](http://my.tablotv.com/)|
 |[<img src="https://user-images.githubusercontent.com/2803310/34083705-349c8fd0-e375-11e7-92a6-5c38509f4936.png" width="120">](https://www.streamroot.io/)|[<img src="http://vignette1.wikia.nocookie.net/tedtalks/images/c/c0/TED_logo.png/revision/20150915192527" width="120">](https://www.ted.com/)|[<img src="https://www.seeklogo.net/wp-content/uploads/2014/12/twitter-logo-vector-download.jpg" width="120">](https://twitter.com/)|[<img src="https://cloud.githubusercontent.com/assets/8201317/20566816/bc33f51c-b196-11e6-9bd3-afb71a06460b.png" width="120">](http://vwflow.com)|
-|[<img src="http://media.mtvnservices.com/edge/hosted/Viacom_logo.svg" width="120">](https://www.viacom.com/)|[<img src="https://user-images.githubusercontent.com/1181974/29248959-efabc440-802d-11e7-8050-7c1f4ca6c607.png" width="120">](https://vk.com/)|[<img src="https://s3.amazonaws.com/uploads.hipchat.com/87223/4876411/7Rybnl26ReFzlt3/jw-logo-red.png" width="120">](https://www.jwplayer.com)|[<img src="https://staticftv-a.akamaihd.net/arches/francetv/default/img/og-image.jpg?20161007" width="120">](https://www.france.tv)|
+|[<img src="https://player.mtvnservices.com/edge/hosted/Viacom_logo.svg" width="120">](https://www.viacom.com/)|[<img src="https://user-images.githubusercontent.com/1181974/29248959-efabc440-802d-11e7-8050-7c1f4ca6c607.png" width="120">](https://vk.com/)|[<img src="https://s3.amazonaws.com/uploads.hipchat.com/87223/4876411/7Rybnl26ReFzlt3/jw-logo-red.png" width="120">](https://www.jwplayer.com)|[<img src="https://staticftv-a.akamaihd.net/arches/francetv/default/img/og-image.jpg?20161007" width="120">](https://www.france.tv)|
 |[<img src="http://showmax.akamaized.net/e/logo/showmax_black.png" width="120">](https://tech.showmax.com)|[<img src="https://static3.1tv.ru/assets/web/logo-ac67852f1625b338f9d1fb96be089d03557d50bfc5790d5f48dc56799f59dec6.svg" width="120" height="120">](https://www.1tv.ru/) | [<img src="https://user-images.githubusercontent.com/1480052/40482633-c013ebce-5f55-11e8-96d5-b776415de0ce.png" width="120">](https://www.zdf.de) | [<img src="https://github.com/cdnbye/hlsjs-p2p-engine/blob/master/figs/cdnbye.png" width="120">](https://github.com/cdnbye/hlsjs-p2p-engine)| |
 |[<img src="https://streaming.cdn77.com/live-streaming-logo-dark.png" width="120">](https://streaming.cdn77.com/)| [<img src="https://avatars0.githubusercontent.com/u/7442371?s=200&v=4" width="120">](https://r7.com/)|[<img src="https://raw.githubusercontent.com/Novage/p2p-media-loader/gh-pages/images/p2pml-logo.png" width="120">](https://github.com/Novage/p2p-media-loader)
 

From 421fe24802c9251bf8c56e02b9f9709e9755501f Mon Sep 17 00:00:00 2001
From: Michael Cunningham <michael.cunningham@redspace.com>
Date: Tue, 12 Feb 2019 18:55:46 -0400
Subject: [PATCH 51/59] (misc) Removing IE8-specific (dead) vtt/cue code

---
 src/utils/vttcue.js | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/src/utils/vttcue.js b/src/utils/vttcue.js
index 30179887a73..9e8e6423ff2 100644
--- a/src/utils/vttcue.js
+++ b/src/utils/vttcue.js
@@ -65,20 +65,9 @@ export default (function () {
 
   function VTTCue (startTime, endTime, text) {
     let cue = this;
-    let isIE8 = (function () {
-      if (typeof navigator === 'undefined') {
-        return;
-      }
-
-      return (/MSIE\s8\.0/).test(navigator.userAgent);
-    })();
     let baseObj = {};
 
-    if (isIE8) {
-      cue = document.createElement('custom');
-    } else {
-      baseObj.enumerable = true;
-    }
+    baseObj.enumerable = true;
 
     /**
      * Shim implementation specific properties. These properties are not in
@@ -294,11 +283,7 @@ export default (function () {
      */
 
     // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#text-track-cue-display-state
-    cue.displayState = undefined;
-
-    if (isIE8) {
-      return cue;
-    }
+    cue.displayState = void 0;
   }
 
   /**

From 52bc8fb175ffa0594eef701248db7b85c24d216b Mon Sep 17 00:00:00 2001
From: Michael Cunningham <michael.cunningham@live.ca>
Date: Wed, 13 Feb 2019 13:18:42 -0400
Subject: [PATCH 52/59] (misc): converting binary search to typescript (#2129)

---
 src/utils/binary-search.js | 41 -----------------------------------
 src/utils/binary-search.ts | 44 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 41 deletions(-)
 delete mode 100644 src/utils/binary-search.js
 create mode 100644 src/utils/binary-search.ts

diff --git a/src/utils/binary-search.js b/src/utils/binary-search.js
deleted file mode 100644
index 87bd46828b4..00000000000
--- a/src/utils/binary-search.js
+++ /dev/null
@@ -1,41 +0,0 @@
-let BinarySearch = {
-  /**
-     * Searches for an item in an array which matches a certain condition.
-     * This requires the condition to only match one item in the array,
-     * and for the array to be ordered.
-     *
-     * @param {Array} list The array to search.
-     * @param {Function} comparisonFunction
-     *      Called and provided a candidate item as the first argument.
-     *      Should return:
-     *          > -1 if the item should be located at a lower index than the provided item.
-     *          > 1 if the item should be located at a higher index than the provided item.
-     *          > 0 if the item is the item you're looking for.
-     *
-     * @return {*} The object if it is found or null otherwise.
-     */
-  search: function (list, comparisonFunction) {
-    let minIndex = 0;
-    let maxIndex = list.length - 1;
-    let currentIndex = null;
-    let currentElement = null;
-
-    while (minIndex <= maxIndex) {
-      currentIndex = (minIndex + maxIndex) / 2 | 0;
-      currentElement = list[currentIndex];
-
-      let comparisonResult = comparisonFunction(currentElement);
-      if (comparisonResult > 0) {
-        minIndex = currentIndex + 1;
-      } else if (comparisonResult < 0) {
-        maxIndex = currentIndex - 1;
-      } else {
-        return currentElement;
-      }
-    }
-
-    return null;
-  }
-};
-
-export default BinarySearch;
diff --git a/src/utils/binary-search.ts b/src/utils/binary-search.ts
new file mode 100644
index 00000000000..01c8b492ada
--- /dev/null
+++ b/src/utils/binary-search.ts
@@ -0,0 +1,44 @@
+type BinarySearchComparison < T > = (candidate: T) => -1 | 0 | 1;
+
+const BinarySearch = {
+
+  /**
+   * Searches for an item in an array which matches a certain condition.
+   * This requires the condition to only match one item in the array,
+   * and for the array to be ordered.
+   *
+   * @param {Array<T>} list The array to search.
+   * @param {BinarySearchComparison<T>} comparisonFn
+   *      Called and provided a candidate item as the first argument.
+   *      Should return:
+   *          > -1 if the item should be located at a lower index than the provided item.
+   *          > 1 if the item should be located at a higher index than the provided item.
+   *          > 0 if the item is the item you're looking for.
+   *
+   * @return {T | null} The object if it is found or null otherwise.
+   */
+  search: function<T> (list: T[], comparisonFn: BinarySearchComparison<T>): T | null {
+    let minIndex: number = 0;
+    let maxIndex: number = list.length - 1;
+    let currentIndex: number | null = null;
+    let currentElement: T | null = null;
+
+    while (minIndex <= maxIndex) {
+      currentIndex = (minIndex + maxIndex) / 2 | 0;
+      currentElement = list[currentIndex];
+
+      let comparisonResult = comparisonFn(currentElement);
+      if (comparisonResult > 0) {
+        minIndex = currentIndex + 1;
+      } else if (comparisonResult < 0) {
+        maxIndex = currentIndex - 1;
+      } else {
+        return currentElement;
+      }
+    }
+
+    return null;
+  }
+};
+
+export default BinarySearch;

From 4b4a067fb6373255bd0312aa27261201f51ecd89 Mon Sep 17 00:00:00 2001
From: mfedderly <mdfedderly@mdfedderly.com>
Date: Wed, 13 Feb 2019 12:53:57 -0500
Subject: [PATCH 53/59] Reduce GC pressure from ID3._utf8ArrayToStr (#2035)

* Reduce GC pressure from ID3._utf8ArrayToStr

If the TextDecoder API exists, it is significantly faster for large payloads than the existing code.
This work happens on the main thread, so large payloads may cause UI hiccups. On my Chrome70 profiler runs, most of the time was actually being spent in GC.
---
 src/demux/id3.js          | 27 +++++++++++++++++++++++++++
 tests/unit/demuxer/id3.js | 12 ++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 tests/unit/demuxer/id3.js

diff --git a/src/demux/id3.js b/src/demux/id3.js
index 6ae48adb2e8..23e0ba4abf2 100644
--- a/src/demux/id3.js
+++ b/src/demux/id3.js
@@ -1,3 +1,5 @@
+import { getSelfScope } from '../utils/get-self-scope';
+
 /**
  * ID3 parser
  */
@@ -294,6 +296,20 @@ class ID3 {
    * This library is free.  You can redistribute it and/or modify it.
    */
   static _utf8ArrayToStr (array, exitOnNull = false) {
+    const decoder = getTextDecoder();
+    if (decoder) {
+      const decoded = decoder.decode(array);
+
+      if (exitOnNull) {
+        // grab up to the first null
+        const idx = decoded.indexOf('\0');
+        return idx !== -1 ? decoded.substring(0, idx) : decoded;
+      }
+
+      // remove any null characters
+      return decoded.replace(/\0/g, '');
+    }
+
     const len = array.length;
     let c;
     let char2;
@@ -333,6 +349,17 @@ class ID3 {
   }
 }
 
+let decoder;
+
+function getTextDecoder () {
+  const global = getSelfScope(); // safeguard for code that might run both on worker and main thread
+  if (!decoder && typeof global.TextDecoder !== 'undefined') {
+    decoder = new global.TextDecoder('utf-8');
+  }
+
+  return decoder;
+}
+
 const utf8ArrayToStr = ID3._utf8ArrayToStr;
 
 export default ID3;
diff --git a/tests/unit/demuxer/id3.js b/tests/unit/demuxer/id3.js
new file mode 100644
index 00000000000..6ae846ae07b
--- /dev/null
+++ b/tests/unit/demuxer/id3.js
@@ -0,0 +1,12 @@
+import { utf8ArrayToStr } from '../../../src/demux/id3.js';
+
+describe('ID3 tests', function () {
+  it('utf8ArrayToStr', function () {
+    const aB = new Uint8Array([97, 98]);
+    const aNullBNullC = new Uint8Array([97, 0, 98, 0, 99]);
+
+    expect(utf8ArrayToStr(aB)).to.equal('ab');
+    expect(utf8ArrayToStr(aNullBNullC)).to.equal('abc');
+    expect(utf8ArrayToStr(aNullBNullC, true)).to.equal('a');
+  });
+});

From 2e9f2de5f626fb5fa5074f3d9ec760cd82ad4670 Mon Sep 17 00:00:00 2001
From: Michael Cunningham <michael.cunningham@live.ca>
Date: Thu, 14 Feb 2019 11:29:47 -0400
Subject: [PATCH 54/59] GH-2082: Replacing usage of
 Array.prototype.find/findIndex (#2117)

* GH-2082: Replacing usage of Array.prototype.find and Array.protoype.findIndex with alternate solutions

* GH-2082: Adding eslint rule for restricting usage of findIndex/find methods
---
 .eslintrc.js                          |  5 +++++
 src/controller/level-controller.js    | 10 +++++++++-
 src/controller/timeline-controller.js | 10 +++++++++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/.eslintrc.js b/.eslintrc.js
index 70e5a613c8a..6e04d135b89 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -76,6 +76,11 @@ module.exports = {
       'never'
     ],
 
+    'no-restricted-properties': [2,
+      { 'property': 'findIndex' },  // Intended to block usage of Array.prototype.findIndex
+      { 'property': 'find' }        // Intended to block usage of Array.prototype.find
+    ],
+
     'standard/no-callback-literal': 1,
     'import/first': 1,
     'no-var': 1,
diff --git a/src/controller/level-controller.js b/src/controller/level-controller.js
index d4e37bcd6e0..e5779daa1aa 100644
--- a/src/controller/level-controller.js
+++ b/src/controller/level-controller.js
@@ -427,7 +427,15 @@ export default class LevelController extends EventHandler {
     }
 
     if (currentLevel.audioGroupIds) {
-      const urlId = currentLevel.audioGroupIds.findIndex((groupId) => groupId === audioGroupId);
+      let urlId = -1;
+
+      for (let i = 0; i < currentLevel.audioGroupIds.length; i++) {
+        if (currentLevel.audioGroupIds[i] === audioGroupId) {
+          urlId = i;
+          break;
+        }
+      }
+
       if (urlId !== currentLevel.urlId) {
         currentLevel.urlId = urlId;
         this.startLoad();
diff --git a/src/controller/timeline-controller.js b/src/controller/timeline-controller.js
index 7e350ae30c4..229bc358a18 100644
--- a/src/controller/timeline-controller.js
+++ b/src/controller/timeline-controller.js
@@ -197,7 +197,15 @@ class TimelineController extends EventHandler {
       this.tracks.forEach((track, index) => {
         let textTrack;
         if (index < inUseTracks.length) {
-          const inUseTrack = [].slice.call(inUseTracks).find(inUseTrack => canReuseVttTextTrack(inUseTrack, track));
+          let inUseTrack = null;
+
+          for (let i = 0; i < inUseTracks.length; i++) {
+            if (canReuseVttTextTrack(inUseTracks[i], track)) {
+              inUseTrack = inUseTracks[i];
+              break;
+            }
+          }
+
           // Reuse tracks with the same label, but do not reuse 608/708 tracks
           if (inUseTrack) {
             textTrack = inUseTrack;

From 8a1815200683e2e75c007c91214e041a49eac36c Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Thu, 21 Feb 2019 22:23:38 -0400
Subject: [PATCH 55/59] Callbacks are defined, removing TODO.

---
 src/types/loader.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/types/loader.ts b/src/types/loader.ts
index 0272d230909..f60a0909a9a 100644
--- a/src/types/loader.ts
+++ b/src/types/loader.ts
@@ -84,7 +84,6 @@ export interface LoaderCallbacks<T extends LoaderContext>{
   onProgress?: LoaderOnProgress<T>,
 }
 
-// TODO: define callbacks - see https://github.com/video-dev/hls.js/blob/master/docs/API.md#loader
 export interface Loader<T extends LoaderContext> {
   destory(): void
   abort(): void

From 30394205dcea0c2b406caaf0f7aac38ae3326b9d Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <1956521+itsjamie@users.noreply.github.com>
Date: Sat, 23 Feb 2019 00:55:57 -0400
Subject: [PATCH 56/59] Change responseType to string

Per feedback from John, the further defined response type caused issue in callers.
---
 src/types/loader.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/types/loader.ts b/src/types/loader.ts
index f60a0909a9a..3fa9df6ebe1 100644
--- a/src/types/loader.ts
+++ b/src/types/loader.ts
@@ -4,7 +4,7 @@ export interface LoaderContext {
   // target URL
   url: string
   // loader response type (arraybuffer or default response type for playlist)
-  responseType: XMLHttpRequestResponseType
+  responseType: string
   // start byte range offset
   rangeStart?: number
   // end byte range offset

From 50e462e4f948e0f598c740d0412494475becfc00 Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <1956521+itsjamie@users.noreply.github.com>
Date: Sat, 23 Feb 2019 00:56:17 -0400
Subject: [PATCH 57/59] Typo fix for destory -> destroy.

---
 src/types/loader.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/types/loader.ts b/src/types/loader.ts
index 3fa9df6ebe1..f99aa1dab88 100644
--- a/src/types/loader.ts
+++ b/src/types/loader.ts
@@ -85,7 +85,7 @@ export interface LoaderCallbacks<T extends LoaderContext>{
 }
 
 export interface Loader<T extends LoaderContext> {
-  destory(): void
+  destroy(): void
   abort(): void
   load(
     context: LoaderContext,

From e8a4085693ffe7658224cb3c9396b5cc668d02a3 Mon Sep 17 00:00:00 2001
From: Guillaume du Pontavice <g.du.pontavice@gmail.com>
Date: Sun, 24 Feb 2019 14:52:10 -0800
Subject: [PATCH 58/59] mp4-remuxer / remuxAudio() : recompute mdatSize / dont
 rely on audioTrack.len (#2096)

* mp4-remuxer / remuxAudio() : dont rely on track.len to compute mdatSize

recompute it by looping through all samples and summing their individual size

get rid of track.len as it should now be useless

related to #2063
---
 src/demux/adts.js          |  2 --
 src/demux/mpegaudio.js     |  1 -
 src/demux/tsdemuxer.js     |  1 -
 src/remux/mp4-remuxer.js   | 29 ++++++++++++++---------------
 tests/unit/demuxer/adts.js |  2 --
 5 files changed, 14 insertions(+), 21 deletions(-)

diff --git a/src/demux/adts.js b/src/demux/adts.js
index ccbac365fe5..8ca6fca864c 100644
--- a/src/demux/adts.js
+++ b/src/demux/adts.js
@@ -229,8 +229,6 @@ export function appendFrame (track, data, offset, pts, frameIndex) {
     };
 
     track.samples.push(aacSample);
-    track.len += frameLength;
-
     return { sample: aacSample, length: frameLength + headerLength };
   }
 
diff --git a/src/demux/mpegaudio.js b/src/demux/mpegaudio.js
index 0b95b825078..6f3bc0642d9 100644
--- a/src/demux/mpegaudio.js
+++ b/src/demux/mpegaudio.js
@@ -67,7 +67,6 @@ const MpegAudio = {
       track.channelCount = header.channelCount;
       track.samplerate = header.sampleRate;
       track.samples.push(sample);
-      track.len += header.frameLength;
 
       return { sample, length: header.frameLength };
     }
diff --git a/src/demux/tsdemuxer.js b/src/demux/tsdemuxer.js
index 81ae6e7b9e9..b51c0f46ea1 100644
--- a/src/demux/tsdemuxer.js
+++ b/src/demux/tsdemuxer.js
@@ -94,7 +94,6 @@ class TSDemuxer {
       inputTimeScale: 90000,
       sequenceNumber: 0,
       samples: [],
-      len: 0,
       dropped: type === 'video' ? 0 : undefined,
       isAAC: type === 'audio' ? true : undefined,
       duration: type === 'audio' ? duration : undefined
diff --git a/src/remux/mp4-remuxer.js b/src/remux/mp4-remuxer.js
index 3ccc89ab2a9..7e258489995 100644
--- a/src/remux/mp4-remuxer.js
+++ b/src/remux/mp4-remuxer.js
@@ -393,7 +393,6 @@ class MP4Remuxer {
     // next AVC sample DTS should be equal to last sample DTS + last sample duration (in PES timescale)
     this.nextAvcDts = lastDTS + mp4SampleDuration;
     let dropped = track.dropped;
-    track.len = 0;
     track.nbNalu = 0;
     track.dropped = 0;
     if (outputSamples.length && navigator.userAgent.toLowerCase().indexOf('chrome') > -1) {
@@ -434,11 +433,11 @@ class MP4Remuxer {
     const initPTS = this._initPTS;
     const rawMPEG = !track.isAAC && this.typeSupported.mpeg;
 
-    let offset,
-      mp4Sample,
+    let mp4Sample,
       fillFrame,
       mdat, moof,
       firstPTS, lastPTS,
+      offset = (rawMPEG ? 0 : 8),
       inputSamples = track.samples,
       outputSamples = [],
       nextAudioPts = this.nextAudioPts;
@@ -503,7 +502,6 @@ class MP4Remuxer {
         if (delta <= -maxAudioFramesDrift * inputSampleDuration) {
           logger.warn(`Dropping 1 audio frame @ ${(nextPts / inputTimeScale).toFixed(3)}s due to ${Math.round(duration)} ms overlap.`);
           inputSamples.splice(i, 1);
-          track.len -= sample.unit.length;
           // Don't touch nextPtsNorm or i
         } // eslint-disable-line brace-style
 
@@ -522,7 +520,6 @@ class MP4Remuxer {
               fillFrame = sample.unit.subarray();
             }
             inputSamples.splice(i, 0, { unit: fillFrame, pts: newStamp, dts: newStamp });
-            track.len += fillFrame.length;
             nextPts += inputSampleDuration;
             i++;
           }
@@ -543,6 +540,13 @@ class MP4Remuxer {
       }
     }
 
+    // compute mdat size, as we eventually filtered/added some samples
+    let nbSamples = inputSamples.length;
+    let mdatSize = 0;
+    while (nbSamples--) {
+      mdatSize += inputSamples[nbSamples].unit.byteLength;
+    }
+
     for (let j = 0, nbSamples = inputSamples.length; j < nbSamples; j++) {
       let audioSample = inputSamples[j];
       let unit = audioSample.unit;
@@ -568,13 +572,13 @@ class MP4Remuxer {
                   fillFrame = unit.subarray();
                 }
 
-                track.len += numMissingFrames * fillFrame.length;
+                mdatSize += numMissingFrames * fillFrame.length;
               }
               // if we have frame overlap, overlapping for more than half a frame duraion
             } else if (delta < -12) {
               // drop overlapping audio frames... browser will deal with it
               logger.log(`drop overlapping AAC sample, expected/parsed/delta:${(nextAudioPts / inputTimeScale).toFixed(3)}s/${(pts / inputTimeScale).toFixed(3)}s/${(-delta)}ms`);
-              track.len -= unit.byteLength;
+              mdatSize -= unit.byteLength;
               continue;
             }
             // set PTS/DTS to expected PTS/DTS
@@ -583,11 +587,8 @@ class MP4Remuxer {
         }
         // remember first PTS of our audioSamples
         firstPTS = pts;
-        if (track.len > 0) {
-          /* concatenate the audio data and construct the mdat in place
-            (need 8 more bytes to fill length and mdat type) */
-          let mdatSize = rawMPEG ? track.len : track.len + 8;
-          offset = rawMPEG ? 0 : 8;
+        if (mdatSize > 0) {
+          mdatSize += offset;
           try {
             mdat = new Uint8Array(mdatSize);
           } catch (err) {
@@ -646,7 +647,7 @@ class MP4Remuxer {
       lastPTS = pts;
     }
     let lastSampleDuration = 0;
-    let nbSamples = outputSamples.length;
+    nbSamples = outputSamples.length;
     // set last sample duration as being identical to previous sample
     if (nbSamples >= 2) {
       lastSampleDuration = outputSamples[nbSamples - 2].duration;
@@ -656,7 +657,6 @@ class MP4Remuxer {
       // next audio sample PTS should be equal to last sample PTS + duration
       this.nextAudioPts = nextAudioPts = lastPTS + scaleFactor * lastSampleDuration;
       // logger.log('Audio/PTS/PTSend:' + audioSample.pts.toFixed(0) + '/' + this.nextAacDts.toFixed(0));
-      track.len = 0;
       track.samples = outputSamples;
       if (rawMPEG) {
         moof = new Uint8Array();
@@ -715,7 +715,6 @@ class MP4Remuxer {
     for (let i = 0; i < nbSamples; i++) {
       let stamp = startDTS + i * frameDuration;
       samples.push({ unit: silentFrame, pts: stamp, dts: stamp });
-      track.len += silentFrame.length;
     }
     track.samples = samples;
 
diff --git a/tests/unit/demuxer/adts.js b/tests/unit/demuxer/adts.js
index f72ffb8f4eb..c8939f8344c 100644
--- a/tests/unit/demuxer/adts.js
+++ b/tests/unit/demuxer/adts.js
@@ -394,7 +394,6 @@ describe('appendFrame', function () {
       length: 16
     });
     expect(track.samples.length).to.equal(1);
-    expect(track.len).to.equal(7);
   });
 
   it('should not append sample if `parseFrameHeader` fails', function () {
@@ -410,6 +409,5 @@ describe('appendFrame', function () {
 
     expect(appendFrame(track, data, 0, 0, 0)).to.be.undefined;
     expect(track.samples.length).to.equal(0);
-    expect(track.len).to.equal(0);
   });
 });

From 452b261161e4be3da8f9dc61407855d7c4ff9fcc Mon Sep 17 00:00:00 2001
From: Jamie Stackhouse <contin673@gmail.com>
Date: Sun, 24 Feb 2019 20:47:57 -0400
Subject: [PATCH 59/59] Change networkDetails type to "unknown".

---
 src/loader/playlist-loader.ts | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/loader/playlist-loader.ts b/src/loader/playlist-loader.ts
index 6aee398b7ba..6527ec80270 100644
--- a/src/loader/playlist-loader.ts
+++ b/src/loader/playlist-loader.ts
@@ -236,7 +236,7 @@ class PlaylistLoader extends EventHandler {
     return true;
   }
 
-  loadsuccess (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any = null) {
+  loadsuccess (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: unknown = null) {
     if (context.isSidxRequest) {
       this._handleSidxRequest(response, context);
       this._handlePlaylistLoaded(response, stats, context, networkDetails);
@@ -277,7 +277,7 @@ class PlaylistLoader extends EventHandler {
 
   // TODO(typescript-config): networkDetails can currently be a XHR or Fetch impl,
   // but with custom loaders it could be generic investigate this further when config is typed
-  _handleMasterPlaylist (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any) {
+  _handleMasterPlaylist (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: unknown) {
     const hls = this.hls;
     const string = response.data;
 
@@ -331,7 +331,7 @@ class PlaylistLoader extends EventHandler {
     });
   }
 
-  _handleTrackOrLevelPlaylist (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any) {
+  _handleTrackOrLevelPlaylist (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: unknown) {
     const hls = this.hls;
 
     const { id, level, type } = context;
@@ -424,7 +424,7 @@ class PlaylistLoader extends EventHandler {
     }
   }
 
-  _handleManifestParsingError (response: LoaderResponse, context: PlaylistLoaderContext, reason: string, networkDetails: any) {
+  _handleManifestParsingError (response: LoaderResponse, context: PlaylistLoaderContext, reason: string, networkDetails: unknown) {
     this.hls.trigger(Event.ERROR, {
       type: ErrorTypes.NETWORK_ERROR,
       details: ErrorDetails.MANIFEST_PARSING_ERROR,
@@ -435,7 +435,7 @@ class PlaylistLoader extends EventHandler {
     });
   }
 
-  _handleNetworkError (context: PlaylistLoaderContext, networkDetails: any, timeout: boolean = false, response: LoaderResponse | null = null) {
+  _handleNetworkError (context: PlaylistLoaderContext, networkDetails: unknown, timeout: boolean = false, response: LoaderResponse | null = null) {
     logger.info(`A network error occured while loading a ${context.type}-type playlist`);
 
     let details;
@@ -484,7 +484,7 @@ class PlaylistLoader extends EventHandler {
     this.hls.trigger(Event.ERROR, errorData);
   }
 
-  _handlePlaylistLoaded (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: any) {
+  _handlePlaylistLoaded (response: LoaderResponse, stats: LoaderStats, context: PlaylistLoaderContext, networkDetails: unknown) {
     const { type, level, id, levelDetails } = context;
 
     if (!levelDetails || !levelDetails.targetduration) {