diff --git a/.eslintrc.js b/.eslintrc.js
index 1ebd095db48..02b5510b9cb 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,43 +1,43 @@
 module.exports = {
-  'env': {
-    'browser': true,
-    'commonjs': true,
-    'es6': true
+  env: {
+    browser: true,
+    commonjs: true,
+    es6: true
   },
-  'globals': {
+  globals: {
     // Allowed globals
-    'console': true,
+    console: true,
 
     // Compile-time defines
-    '__VERSION__': true,
-    '__USE_SUBTITLES__': true,
-    '__USE_ALT_AUDIO__': true,
-    '__USE_EME_DRM__': true
+    __VERSION__: true,
+    __USE_SUBTITLES__: true,
+    __USE_ALT_AUDIO__: true,
+    __USE_EME_DRM__: true
   },
   // see https://standardjs.com/
   // see https://github.com/standard/eslint-config-standard
-  'extends': [
+  extends: [
     'eslint:recommended',
     'standard'
   ],
-  'parser': '@typescript-eslint/parser',
-  'parserOptions': {
-    'sourceType': 'module'
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    sourceType: 'module'
   },
-  'plugins': [
+  plugins: [
     '@typescript-eslint'
   ],
-  'rules': {
+  rules: {
     // our basic style rules
-    'semi': [
+    semi: [
       'error',
       'always'
     ],
-    'indent': [
+    indent: [
       'error',
       2
     ],
-    'quotes': [
+    quotes: [
       'error',
       'single'
     ],
@@ -47,14 +47,14 @@ module.exports = {
     ],
     // spacing
     'space-infix-ops': 2,
-    'space-unary-ops': [2, { 'words': true, 'nonwords': false }],
+    'space-unary-ops': [2, { words: true, nonwords: false }],
     'space-in-parens': ['error', 'never'],
-    'keyword-spacing': [2, { 'before': true, 'after': true }],
+    'keyword-spacing': [2, { before: true, after: true }],
     // enforce litteral objects on multiple lines
     'block-spacing': 'error',
-    'curly': 2,
+    curly: 2,
     'object-curly-spacing': ['error', 'always'],
-    'brace-style': ['error', '1tbs', { 'allowSingleLine': false }],
+    'brace-style': ['error', '1tbs', { allowSingleLine: false }],
 
     // limit code block and line length
     /*
@@ -75,26 +75,26 @@ module.exports = {
 
     'no-restricted-globals': [2,
       {
-        'name': 'window',
-        'message': 'Use `self` instead of `window` to access the global context everywhere (including workers).'
+        name: 'window',
+        message: 'Use `self` instead of `window` to access the global context everywhere (including workers).'
       },
       {
-        'name': 'SourceBuffer',
-        'message': 'Use `self.SourceBuffer`'
+        name: 'SourceBuffer',
+        message: 'Use `self.SourceBuffer`'
       },
       {
-        'name': 'setTimeout',
-        'message': 'Use `self.setTimeout`'
+        name: 'setTimeout',
+        message: 'Use `self.setTimeout`'
       },
       {
-        'name': 'setInterval',
-        'message': 'Use `self.setInterval`'
+        name: 'setInterval',
+        message: 'Use `self.setInterval`'
       }
     ],
 
     'no-restricted-properties': [2,
-      { 'property': 'findIndex' },  // Intended to block usage of Array.prototype.findIndex
-      { 'property': 'find' }        // Intended to block usage of Array.prototype.find
+      { 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,
@@ -106,7 +106,7 @@ module.exports = {
     'no-console': [
       1,
       {
-        "allow": ["assert"]
+        allow: ['assert']
       }
     ],
     'no-fallthrough': 1,
@@ -125,17 +125,20 @@ module.exports = {
     'lines-between-class-members': 2,
     'no-prototype-builtins': 0
   },
-  'overrides': [
+  overrides: [
     {
-      'files': ['*.ts'],
-      'rules': {
+      files: ['*.ts'],
+      rules: {
         'no-unused-vars': 0,
-        '@typescript-eslint/no-unused-vars': [ 'error', { 'args': 'none' } ],
+        'no-undef': 0,
+        'no-use-before-define': 'off',
+        // '@typescript-eslint/no-use-before-define': ['error'],
+        '@typescript-eslint/no-unused-vars': ['error', { args: 'none' }],
         '@typescript-eslint/prefer-optional-chain': 2,
-        '@typescript-eslint/consistent-type-assertions': [ 2,
+        '@typescript-eslint/consistent-type-assertions': [2,
           {
-            'assertionStyle': 'as',
-            'objectLiteralTypeAssertions': 'never'
+            assertionStyle: 'as',
+            objectLiteralTypeAssertions: 'never'
           }
         ]
       }
diff --git a/package-lock.json b/package-lock.json
index 2558113237a..0eb50272a63 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2330,6 +2330,59 @@
       "integrity": "sha512-EdGnA7n2UmX9Z0e2tIU0biKz8tCgtjbY69KoyH3yiMzm7Q9sriIlN9bZjqhTOKzM0GdLSGrkyKWif08xWKyucA==",
       "dev": true
     },
+    "@eslint/eslintrc": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.1.3.tgz",
+      "integrity": "sha512-4YVwPkANLeNtRjMekzux1ci8hIaH5eGKktGqR0d3LWsKNn5B2X/1Z6Trxy7jQXl9EBGE6Yj02O+t09FMeRllaA==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "lodash": "^4.17.19",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.12.6",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        },
+        "strip-json-comments": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
+          "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
+          "dev": true
+        }
+      }
+    },
     "@itsjamie/esdoc-accessor-plugin": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/@itsjamie/esdoc-accessor-plugin/-/esdoc-accessor-plugin-0.3.0.tgz",
@@ -2692,6 +2745,14 @@
       "dev": true,
       "requires": {
         "typescript": "^3.7.4"
+      },
+      "dependencies": {
+        "typescript": {
+          "version": "3.9.7",
+          "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
+          "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
+          "dev": true
+        }
       }
     },
     "@itsjamie/esdoc-undocumented-identifier-plugin": {
@@ -4711,12 +4772,6 @@
         "@types/node": "*"
       }
     },
-    "@types/eslint-visitor-keys": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
-      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
-      "dev": true
-    },
     "@types/events": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
@@ -4769,9 +4824,9 @@
       }
     },
     "@types/json-schema": {
-      "version": "7.0.4",
-      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.4.tgz",
-      "integrity": "sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==",
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.6.tgz",
+      "integrity": "sha512-3c+yGKvVP5Y9TYBEibGNR+kLtijnj7mYrXRg+WpFb2X9xm04g/DXYkfg4hmzJQosc9snFNUPkbYIhu+KAm6jJw==",
       "dev": true
     },
     "@types/json5": {
@@ -4899,52 +4954,126 @@
       }
     },
     "@typescript-eslint/eslint-plugin": {
-      "version": "2.34.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.34.0.tgz",
-      "integrity": "sha512-4zY3Z88rEE99+CNvTbXSyovv2z9PNOVffTWD2W8QF5s2prBQtwN2zadqERcrHpcR7O/+KMI3fcTAmUUhK/iQcQ==",
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.5.0.tgz",
+      "integrity": "sha512-mjb/gwNcmDKNt+6mb7Aj/TjKzIJjOPcoCJpjBQC9ZnTRnBt1p4q5dJSSmIqAtsZ/Pff5N+hJlbiPc5bl6QN4OQ==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/experimental-utils": "2.34.0",
+        "@typescript-eslint/experimental-utils": "4.5.0",
+        "@typescript-eslint/scope-manager": "4.5.0",
+        "debug": "^4.1.1",
         "functional-red-black-tree": "^1.0.1",
         "regexpp": "^3.0.0",
+        "semver": "^7.3.2",
         "tsutils": "^3.17.1"
       }
     },
     "@typescript-eslint/experimental-utils": {
-      "version": "2.34.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.34.0.tgz",
-      "integrity": "sha512-eS6FTkq+wuMJ+sgtuNTtcqavWXqsflWcfBnlYhg/nS4aZ1leewkXGbvBhaapn1q6qf4M71bsR1tez5JTRMuqwA==",
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.5.0.tgz",
+      "integrity": "sha512-bW9IpSAKYvkqDGRZzayBXIgPsj2xmmVHLJ+flGSoN0fF98pGoKFhbunIol0VF2Crka7z984EEhFi623Rl7e6gg==",
       "dev": true,
       "requires": {
         "@types/json-schema": "^7.0.3",
-        "@typescript-eslint/typescript-estree": "2.34.0",
+        "@typescript-eslint/scope-manager": "4.5.0",
+        "@typescript-eslint/types": "4.5.0",
+        "@typescript-eslint/typescript-estree": "4.5.0",
         "eslint-scope": "^5.0.0",
         "eslint-utils": "^2.0.0"
       },
       "dependencies": {
-        "eslint-utils": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/eslint-utils/-/eslint-utils-2.0.0.tgz",
-          "integrity": "sha512-0HCPuJv+7Wv1bACm8y5/ECVfYdfsAm9xmVb7saeFlxjPYALefjhbYoCkBjPdPzGH8wWyTpAez82Fh3VKYEZ8OA==",
+        "@typescript-eslint/typescript-estree": {
+          "version": "4.5.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.5.0.tgz",
+          "integrity": "sha512-gN1mffq3zwRAjlYWzb5DanarOPdajQwx5MEWkWCk0XvqC8JpafDTeioDoow2L4CA/RkYZu7xEsGZRhqrTsAG8w==",
           "dev": true,
           "requires": {
-            "eslint-visitor-keys": "^1.1.0"
+            "@typescript-eslint/types": "4.5.0",
+            "@typescript-eslint/visitor-keys": "4.5.0",
+            "debug": "^4.1.1",
+            "globby": "^11.0.1",
+            "is-glob": "^4.0.1",
+            "lodash": "^4.17.15",
+            "semver": "^7.3.2",
+            "tsutils": "^3.17.1"
+          }
+        },
+        "globby": {
+          "version": "11.0.1",
+          "resolved": "https://registry.npmjs.org/globby/-/globby-11.0.1.tgz",
+          "integrity": "sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==",
+          "dev": true,
+          "requires": {
+            "array-union": "^2.1.0",
+            "dir-glob": "^3.0.1",
+            "fast-glob": "^3.1.1",
+            "ignore": "^5.1.4",
+            "merge2": "^1.3.0",
+            "slash": "^3.0.0"
           }
         }
       }
     },
     "@typescript-eslint/parser": {
-      "version": "2.34.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.34.0.tgz",
-      "integrity": "sha512-03ilO0ucSD0EPTw2X4PntSIRFtDPWjrVq7C3/Z3VQHRC7+13YB55rcJI3Jt+YgeHbjUdJPcPa7b23rXCBokuyA==",
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.5.0.tgz",
+      "integrity": "sha512-xb+gmyhQcnDWe+5+xxaQk5iCw6KqXd8VQxGiTeELTMoYeRjpocZYYRP1gFVM2C8Yl0SpUvLa1lhprwqZ00w3Iw==",
       "dev": true,
       "requires": {
-        "@types/eslint-visitor-keys": "^1.0.0",
-        "@typescript-eslint/experimental-utils": "2.34.0",
-        "@typescript-eslint/typescript-estree": "2.34.0",
-        "eslint-visitor-keys": "^1.1.0"
+        "@typescript-eslint/scope-manager": "4.5.0",
+        "@typescript-eslint/types": "4.5.0",
+        "@typescript-eslint/typescript-estree": "4.5.0",
+        "debug": "^4.1.1"
+      },
+      "dependencies": {
+        "@typescript-eslint/typescript-estree": {
+          "version": "4.5.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.5.0.tgz",
+          "integrity": "sha512-gN1mffq3zwRAjlYWzb5DanarOPdajQwx5MEWkWCk0XvqC8JpafDTeioDoow2L4CA/RkYZu7xEsGZRhqrTsAG8w==",
+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "4.5.0",
+            "@typescript-eslint/visitor-keys": "4.5.0",
+            "debug": "^4.1.1",
+            "globby": "^11.0.1",
+            "is-glob": "^4.0.1",
+            "lodash": "^4.17.15",
+            "semver": "^7.3.2",
+            "tsutils": "^3.17.1"
+          }
+        },
+        "globby": {
+          "version": "11.0.1",
+          "resolved": "https://registry.npmjs.org/globby/-/globby-11.0.1.tgz",
+          "integrity": "sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==",
+          "dev": true,
+          "requires": {
+            "array-union": "^2.1.0",
+            "dir-glob": "^3.0.1",
+            "fast-glob": "^3.1.1",
+            "ignore": "^5.1.4",
+            "merge2": "^1.3.0",
+            "slash": "^3.0.0"
+          }
+        }
       }
     },
+    "@typescript-eslint/scope-manager": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.5.0.tgz",
+      "integrity": "sha512-C0cEO0cTMPJ/w4RA/KVe4LFFkkSh9VHoFzKmyaaDWAnPYIEzVCtJ+Un8GZoJhcvq+mPFXEsXa01lcZDHDG6Www==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.5.0",
+        "@typescript-eslint/visitor-keys": "4.5.0"
+      }
+    },
+    "@typescript-eslint/types": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.5.0.tgz",
+      "integrity": "sha512-n2uQoXnyWNk0Les9MtF0gCK3JiWd987JQi97dMSxBOzVoLZXCNtxFckVqt1h8xuI1ix01t+iMY4h4rFMj/303g==",
+      "dev": true
+    },
     "@typescript-eslint/typescript-estree": {
       "version": "2.34.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.34.0.tgz",
@@ -4968,6 +5097,24 @@
         }
       }
     },
+    "@typescript-eslint/visitor-keys": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.5.0.tgz",
+      "integrity": "sha512-UHq4FSa55NDZqscRU//O5ROFhHa9Hqn9KWTEvJGTArtTQp5GKv9Zqf6d/Q3YXXcFv4woyBml7fJQlQ+OuqRcHA==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.5.0",
+        "eslint-visitor-keys": "^2.0.0"
+      },
+      "dependencies": {
+        "eslint-visitor-keys": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz",
+          "integrity": "sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==",
+          "dev": true
+        }
+      }
+    },
     "@webassemblyjs/ast": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.9.0.tgz",
@@ -5143,6 +5290,29 @@
         "@xtuc/long": "4.2.2"
       }
     },
+    "@webpack-cli/info": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@webpack-cli/info/-/info-1.0.2.tgz",
+      "integrity": "sha512-FEfLQwmN4pXZSYSrtp+KC84rFanoCIxXFpS2wUvviDCE2fnajwxw2GXzbj83IlH4Dl8Wq8kJjavVwvxv3YJmnw==",
+      "dev": true,
+      "requires": {
+        "envinfo": "^7.7.3"
+      },
+      "dependencies": {
+        "envinfo": {
+          "version": "7.7.3",
+          "resolved": "https://registry.npmjs.org/envinfo/-/envinfo-7.7.3.tgz",
+          "integrity": "sha512-46+j5QxbPWza0PB1i15nZx0xQ4I/EfQxg9J8Had3b408SV63nEtor2e+oiY63amTo9KTuh2a3XLObNwduxYwwA==",
+          "dev": true
+        }
+      }
+    },
+    "@webpack-cli/serve": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@webpack-cli/serve/-/serve-1.0.1.tgz",
+      "integrity": "sha512-WGMaTMTK6NOe29Hw1WBEok9vGLfKg5C6jWzNOS/6HH1YadR+RL+TRWRcSyc81Dzulljhk/Ree9mrDM4Np9GGOQ==",
+      "dev": true
+    },
     "@xtuc/ieee754": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/@xtuc/ieee754/-/ieee754-1.2.0.tgz",
@@ -5190,9 +5360,9 @@
       }
     },
     "acorn-jsx": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
-      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
+      "version": "5.3.1",
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+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
           "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==",
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
           "dev": true,
           "requires": {
-            "p-limit": "^2.0.0"
+            "p-limit": "^2.2.0"
           }
         },
         "p-try": {
@@ -20504,59 +20645,79 @@
           "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
           "dev": true
         },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+        "path-exists": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
+          "integrity": "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==",
+          "dev": true
+        },
+        "path-key": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+          "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+          "dev": true
+        },
+        "pkg-dir": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-4.2.0.tgz",
+          "integrity": "sha512-HRDzbaKjC+AOWVXxAU/x54COGeIv9eb+6CkDSQoNTt4XyWoIJvuPsXizxu/Fr23EiekbtZwmh1IcIG/l/a10GQ==",
           "dev": true,
           "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
+            "find-up": "^4.0.0"
           }
         },
-        "supports-color": {
-          "version": "6.1.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
-          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+        "resolve-cwd": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-cwd/-/resolve-cwd-3.0.0.tgz",
+          "integrity": "sha512-OrZaX2Mb+rJCpH/6CpSqt9xFVpN++x01XnN2ie9g6P5/3xelLAkXWVADpdz1IHD/KFfEXyE6V0U01OQ3UO2rEg==",
           "dev": true,
           "requires": {
-            "has-flag": "^3.0.0"
+            "resolve-from": "^5.0.0"
           }
         },
-        "v8-compile-cache": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.3.tgz",
-          "integrity": "sha512-CNmdbwQMBjwr9Gsmohvm0pbL954tJrNzf6gWL3K+QMQf00PF7ERGrEiLgjuU3mKreLC2MeGhUsNV9ybTbLgd3w==",
+        "resolve-from": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+          "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
           "dev": true
         },
-        "yargs": {
-          "version": "13.2.4",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
-          "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
+        "shebang-command": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+          "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
           "dev": true,
           "requires": {
-            "cliui": "^5.0.0",
-            "find-up": "^3.0.0",
-            "get-caller-file": "^2.0.1",
-            "os-locale": "^3.1.0",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^2.0.0",
-            "set-blocking": "^2.0.0",
-            "string-width": "^3.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^4.0.0",
-            "yargs-parser": "^13.1.0"
+            "shebang-regex": "^3.0.0"
           }
         },
-        "yargs-parser": {
-          "version": "13.1.2",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
-          "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+        "shebang-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+          "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+          "dev": true
+        },
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+          "dev": true
+        },
+        "webpack-merge": {
+          "version": "4.2.2",
+          "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.2.2.tgz",
+          "integrity": "sha512-TUE1UGoTX2Cd42j3krGYqObZbOD+xF7u28WB7tfUordytSjbWTIjK/8V0amkBfTYN4/pB/GIDlJZZ657BGG19g==",
           "dev": true,
           "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
+            "lodash": "^4.17.15"
+          }
+        },
+        "which": {
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+          "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+          "dev": true,
+          "requires": {
+            "isexe": "^2.0.0"
           }
         }
       }
@@ -21293,6 +21454,16 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
+    "wordwrapjs": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-4.0.0.tgz",
+      "integrity": "sha512-Svqw723a3R34KvsMgpjFBYCgNOSdcW3mQFK4wIfhGQhtaFVOJmdYoXgi63ne3dTlWgatVcUc7t4HtQ/+bUVIzQ==",
+      "dev": true,
+      "requires": {
+        "reduce-flatten": "^2.0.0",
+        "typical": "^5.0.0"
+      }
+    },
     "worker-farm": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.7.0.tgz",
diff --git a/package.json b/package.json
index 20dfddc6ae1..07e3e0c6dda 100644
--- a/package.json
+++ b/package.json
@@ -70,19 +70,19 @@
     "@types/chart.js": "^2.9.24",
     "@types/mocha": "^8.0.0",
     "@types/sinon-chai": "^3.2.4",
-    "@typescript-eslint/eslint-plugin": "^2.34.0",
-    "@typescript-eslint/parser": "^2.34.0",
+    "@typescript-eslint/eslint-plugin": "^4.4.1",
+    "@typescript-eslint/parser": "^4.0.1",
     "babel-loader": "^8.0.6",
     "babel-plugin-transform-remove-console": "6.9.4",
     "chai": "^4.2.0",
     "chart.js": "^2.9.3",
     "chartjs-plugin-zoom": "^0.7.7",
     "chromedriver": "^86.0.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.11.0",
     "eslint-config-standard": "^14.1.1",
-    "eslint-plugin-import": "^2.21.1",
-    "eslint-plugin-mocha": "^6.3.0",
-    "eslint-plugin-node": "^11.0.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-mocha": "^8.0.0",
+    "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
     "http-server": "^0.12.3",
@@ -103,9 +103,9 @@
     "semver": "^7.3.2",
     "sinon": "^9.0.1",
     "sinon-chai": "^3.5.0",
-    "typescript": "^3.9.5",
+    "typescript": "^4.0.3",
     "webpack": "^4.43.0",
-    "webpack-cli": "^3.1.2",
+    "webpack-cli": "^4.0.0",
     "webpack-dev-server": "^3.11.0",
     "webpack-merge": "^5.1.2",
     "webworkify-webpack": "^2.1.5"
diff --git a/src/controller/audio-stream-controller.ts b/src/controller/audio-stream-controller.ts
index fbd798b6bf9..7918da094c9 100644
--- a/src/controller/audio-stream-controller.ts
+++ b/src/controller/audio-stream-controller.ts
@@ -48,8 +48,7 @@ class AudioStreamController extends BaseStreamController implements ComponentAPI
   protected readonly logPrefix = '[audio-stream-controller]';
 
   constructor (hls: Hls, fragmentTracker: FragmentTracker) {
-    super(hls);
-    this.fragmentTracker = fragmentTracker;
+    super(hls, fragmentTracker);
     this.fragmentLoader = new FragmentLoader(hls.config);
 
     this._registerListeners();
@@ -399,7 +398,7 @@ class AudioStreamController extends BaseStreamController implements ComponentAPI
 
     const track = levels[trackId];
     let sliding = 0;
-    if (newDetails.live) {
+    if (newDetails.live || track.details?.live) {
       if (newDetails.deltaUpdateFailed) {
         return;
       }
diff --git a/src/controller/base-stream-controller.ts b/src/controller/base-stream-controller.ts
index f786967bba3..ce1adf246d2 100644
--- a/src/controller/base-stream-controller.ts
+++ b/src/controller/base-stream-controller.ts
@@ -45,7 +45,7 @@ export default class BaseStreamController extends TaskLoop {
 
   protected fragPrevious: Fragment | null = null;
   protected fragCurrent: Fragment | null = null;
-  protected fragmentTracker!: FragmentTracker;
+  protected fragmentTracker: FragmentTracker;
   protected transmuxer: TransmuxerInterface | null = null;
   protected _state: string = State.STOPPED;
   protected media?: any;
@@ -66,9 +66,10 @@ export default class BaseStreamController extends TaskLoop {
 
   protected readonly logPrefix: string = '';
 
-  constructor (hls: Hls) {
+  constructor (hls: Hls, fragmentTracker: FragmentTracker) {
     super();
     this.hls = hls;
+    this.fragmentTracker = fragmentTracker;
     this.config = hls.config;
     this.decrypter = new Decrypter(hls as HlsEventEmitter, hls.config);
   }
diff --git a/src/controller/stream-controller.ts b/src/controller/stream-controller.ts
index 371db384d1c..8c0ebb92097 100644
--- a/src/controller/stream-controller.ts
+++ b/src/controller/stream-controller.ts
@@ -59,9 +59,8 @@ export default class StreamController extends BaseStreamController implements Ne
   protected readonly logPrefix = '[stream-controller]';
 
   constructor (hls: Hls, fragmentTracker: FragmentTracker) {
-    super(hls);
+    super(hls, fragmentTracker);
     this.fragmentLoader = new FragmentLoader(hls.config);
-    this.fragmentTracker = fragmentTracker;
     this.state = State.STOPPED;
 
     this._registerListeners();
@@ -174,7 +173,7 @@ export default class StreamController extends BaseStreamController implements Ne
       const now = self.performance.now();
       const retryDate = this.retryDate;
       // if current time is gt than retryDate, or if media seeking let's switch to IDLE state to retry loading
-      if (!retryDate || (now >= retryDate) || (this.media && this.media.seeking)) {
+      if (!retryDate || (now >= retryDate) || this.media?.seeking) {
         this.log('retryDate reached, switch back to IDLE state');
         this.state = State.IDLE;
       }
@@ -592,7 +591,7 @@ export default class StreamController extends BaseStreamController implements Ne
 
     const curLevel = levels[newLevelId];
     let sliding = 0;
-    if (newDetails.live) {
+    if (newDetails.live || curLevel.details?.live) {
       if (newDetails.deltaUpdateFailed) {
         return;
       }
diff --git a/src/controller/subtitle-stream-controller.ts b/src/controller/subtitle-stream-controller.ts
index 2b6de50f775..1f3b79212da 100644
--- a/src/controller/subtitle-stream-controller.ts
+++ b/src/controller/subtitle-stream-controller.ts
@@ -38,10 +38,9 @@ export class SubtitleStreamController extends BaseStreamController implements Co
   private tracksBuffered: Array<TimeRange[]>;
 
   constructor (hls: Hls, fragmentTracker: FragmentTracker) {
-    super(hls);
+    super(hls, fragmentTracker);
     this.config = hls.config;
     this.fragCurrent = null;
-    this.fragmentTracker = fragmentTracker;
     this.fragPrevious = null;
     this.media = null;
     this.mediaBuffer = null;
@@ -89,7 +88,6 @@ export class SubtitleStreamController extends BaseStreamController implements Co
   }
 
   onHandlerDestroyed () {
-    delete this.fragmentTracker;
     this.state = State.STOPPED;
     this._unregisterListeners();
     super.onHandlerDestroyed();
@@ -206,7 +204,7 @@ export class SubtitleStreamController extends BaseStreamController implements Co
       return;
     }
     this.mediaBuffer = this.mediaBufferTimeRanges;
-    if (details.live) {
+    if (details.live || currentTrack.details?.live) {
       if (details.deltaUpdateFailed) {
         return;
       }
diff --git a/src/demux/sample-aes.js b/src/demux/sample-aes.js
index 61d021372cf..a8b7cb3dd08 100644
--- a/src/demux/sample-aes.js
+++ b/src/demux/sample-aes.js
@@ -105,7 +105,7 @@ class SampleAesDecrypter {
         }
 
         const curUnit = curUnits[unitIndex];
-        if (curUnit.length <= 48 || (curUnit.type !== 1 && curUnit.type !== 5)) {
+        if (curUnit.data.length <= 48 || (curUnit.type !== 1 && curUnit.type !== 5)) {
           continue;
         }
 
diff --git a/src/demux/transmuxer-interface.ts b/src/demux/transmuxer-interface.ts
index d1213544dc5..5b711206af0 100644
--- a/src/demux/transmuxer-interface.ts
+++ b/src/demux/transmuxer-interface.ts
@@ -97,7 +97,8 @@ export default class TransmuxerInterface {
     if (observer) {
       observer.removeAllListeners();
     }
-    delete this.observer;
+    // @ts-ignore
+    this.observer = null;
   }
 
   push (data: ArrayBuffer, initSegmentData: Uint8Array, audioCodec: string | undefined, videoCodec: string | undefined, frag: Fragment, duration: number, accurateTimeOffset: boolean, chunkMeta: ChunkMetadata, defaultInitPTS?: number): void {
diff --git a/src/hls.ts b/src/hls.ts
index c93fe303d76..df3ef042427 100644
--- a/src/hls.ts
+++ b/src/hls.ts
@@ -471,6 +471,15 @@ export default class Hls implements HlsEventEmitter {
     this.levelController.startLevel = newLevel;
   }
 
+  /**
+   * Get the current setting for capLevelToPlayerSize
+   *
+   * @type {boolean}
+   */
+  get capLevelToPlayerSize (): boolean {
+    return this.config.capLevelToPlayerSize;
+  }
+
   /**
    * set  dynamically set capLevelToPlayerSize against (`CapLevelController`)
    *
diff --git a/src/is-supported.ts b/src/is-supported.ts
index 48eb1b61f13..844976f5dbf 100644
--- a/src/is-supported.ts
+++ b/src/is-supported.ts
@@ -5,7 +5,9 @@ export function isSupported (): boolean {
   if (!mediaSource) {
     return false;
   }
-  const sourceBuffer = self.SourceBuffer || (self as any).WebKitSourceBuffer as SourceBuffer;
+  const sourceBuffer = self.SourceBuffer ||
+    (self as any).WebKitSourceBuffer as SourceBuffer; // eslint-disable-line no-restricted-globals
+
   const isTypeSupported = mediaSource &&
     typeof mediaSource.isTypeSupported === 'function' &&
     mediaSource.isTypeSupported('video/mp4; codecs="avc1.42E01E,mp4a.40.2"');
diff --git a/src/loader/playlist-loader.ts b/src/loader/playlist-loader.ts
index d80fca30309..4370bfc6014 100644
--- a/src/loader/playlist-loader.ts
+++ b/src/loader/playlist-loader.ts
@@ -222,7 +222,7 @@ class PlaylistLoader {
 
     // Override level/track timeout for LL-HLS requests
     // (the default of 10000ms is counter productive to blocking playlist reload requests)
-    if (context.deliveryDirectives && context.deliveryDirectives.part) {
+    if (context.deliveryDirectives?.part) {
       let levelDetails: LevelDetails | undefined;
       if (context.type === PlaylistContextType.LEVEL && context.level !== null) {
         levelDetails = this.hls.levels[context.level].details;
diff --git a/src/types/buffer.ts b/src/types/buffer.ts
index b2a709faaae..2019dd554bf 100644
--- a/src/types/buffer.ts
+++ b/src/types/buffer.ts
@@ -1,6 +1,6 @@
 export type SourceBufferName = 'video' | 'audio' | 'audiovideo';
 
-export type ExtendedSourceBuffer = SourceBuffer & {
+export type ExtendedSourceBuffer = SourceBuffer & { // eslint-disable-line no-restricted-globals
   ended?: boolean
 };
 
diff --git a/src/types/track.ts b/src/types/track.ts
index 0b62ead282b..8a2915207f7 100644
--- a/src/types/track.ts
+++ b/src/types/track.ts
@@ -6,7 +6,7 @@ export interface TrackSet {
 
 export interface Track {
   id: 'audio' | 'main'
-  buffer?: SourceBuffer
+  buffer?: SourceBuffer // eslint-disable-line no-restricted-globals
   container: string;
   codec?: string;
   initSegment?: Uint8Array
diff --git a/src/utils/cues.ts b/src/utils/cues.ts
index 262079b7e69..aba66fe31d5 100644
--- a/src/utils/cues.ts
+++ b/src/utils/cues.ts
@@ -46,14 +46,7 @@ export function newCue (track: TextTrack | null, startTime: number, endTime: num
         indent++;
       }
 
-      // VTTCue.line get's flakey when using controls, so let's now include line 13&14
-      // also, drop line 1 since it's to close to the top
-      if (navigator.userAgent.match(/Firefox\//)) {
-        cue.line = r + 1;
-      } else {
-        cue.line = (r > 7 ? r - 2 : r + 1);
-      }
-
+      cue.line = r + 1;
       cue.align = 'left';
       // Clamp the position between 0 and 100 - if out of these bounds, Firefox throws an exception and captions break
       cue.position = Math.max(0, Math.min(100, 100 * (indent / 32)));
@@ -61,8 +54,18 @@ export function newCue (track: TextTrack | null, startTime: number, endTime: num
     }
   }
   if (track && result.length) {
-    for (let i = result.length; i--;) {
-      track.addCue(result[i]);
+    // Sort bottom cues in reverse order so that they render in line order when overlapping in Chrome
+    const sortedCues = result.sort((cueA, cueB) => {
+      if (cueA.line === 'auto' || cueB.line === 'auto') {
+        return 0;
+      }
+      if (cueA.line > 8 && cueB.line > 8) {
+        return cueB.line - cueA.line;
+      }
+      return cueA.line - cueB.line;
+    });
+    for (let i = 0; i < sortedCues.length; i++) {
+      track.addCue(sortedCues[i]);
     }
   }
   return result;
diff --git a/src/utils/imsc1-ttml-parser.ts b/src/utils/imsc1-ttml-parser.ts
index 89286d4b53d..a27d8d46d83 100644
--- a/src/utils/imsc1-ttml-parser.ts
+++ b/src/utils/imsc1-ttml-parser.ts
@@ -121,7 +121,7 @@ function getTextContent (element, trim): string {
   return [].slice.call(element.childNodes).reduce((str, node, i) => {
     if (node.nodeName === 'br' && i) {
       return str + '\n';
-    } if (node.childNodes && node.childNodes.length) {
+    } if (node.childNodes?.length) {
       return getTextContent(node, trim);
     } else if (trim) {
       return str + node.textContent.trim().replace(/\s+/g, ' ');
diff --git a/src/utils/timescale-conversion.ts b/src/utils/timescale-conversion.ts
index e03927946e3..5dfa79d847e 100644
--- a/src/utils/timescale-conversion.ts
+++ b/src/utils/timescale-conversion.ts
@@ -1,14 +1,14 @@
 const MPEG_TS_CLOCK_FREQ_HZ = 90000;
 
-export function toTimescaleFromScale (value, destScale: number, srcScale: number = 1, round: boolean = false): number {
-  return toTimescaleFromBase(value, destScale, 1 / srcScale, round);
-}
-
 export function toTimescaleFromBase (value, destScale: number, srcBase: number = 1, round: boolean = false): number {
   const result = value * destScale * srcBase; // equivalent to `(value * scale) / (1 / base)`
   return round ? Math.round(result) : result;
 }
 
+export function toTimescaleFromScale (value, destScale: number, srcScale: number = 1, round: boolean = false): number {
+  return toTimescaleFromBase(value, destScale, 1 / srcScale, round);
+}
+
 export function toMsFromMpegTsClock (value: number, round: boolean = false): number {
   return toTimescaleFromBase(value, 1000, 1 / MPEG_TS_CLOCK_FREQ_HZ, round);
 }
diff --git a/tests/.eslintrc.js b/tests/.eslintrc.js
index 14107a8a2ca..2ae7563a616 100644
--- a/tests/.eslintrc.js
+++ b/tests/.eslintrc.js
@@ -1,33 +1,33 @@
 module.exports = {
-    "env": {
-        "node": true,
-        "commonjs": true,
-        "es6": true,
-        "mocha": true
-    },
-  "plugins": [ "mocha" ],
-  "globals": {
-      // Test globals
-      "after": false,
-      "afterEach": false,
-      "assert": false,
-      "before": false,
-      "beforeEach": false,
-      "describe": false,
-      "expect": true,
-      "sinon": false,
-      "xit": false
-    },
-    "rules": {
-        "one-var": 0,
-        "no-undefined": 0,
-        "no-unused-expressions": 0,
-        "no-restricted-modules": ["error", "assert"],
-        "no-restricted-properties": [2,
-          { "property": "findIndex" },  // Intended to block usage of Array.prototype.findIndex
-          { "property": "find" },       // Intended to block usage of Array.prototype.find
-          { "property": "only" }        // Intended to block usage of it.only in commits
-        ],
-        "mocha/no-mocha-arrows": 2
-    }
+  env: {
+    node: true,
+    commonjs: true,
+    es6: true,
+    mocha: true
+  },
+  plugins: ['mocha'],
+  globals: {
+    // Test globals
+    after: false,
+    afterEach: false,
+    assert: false,
+    before: false,
+    beforeEach: false,
+    describe: false,
+    expect: true,
+    sinon: false,
+    xit: false
+  },
+  rules: {
+    'one-var': 0,
+    'no-undefined': 0,
+    'no-unused-expressions': 0,
+    'no-restricted-modules': ['error', 'assert'],
+    'no-restricted-properties': [2,
+      { property: 'findIndex' }, // Intended to block usage of Array.prototype.findIndex
+      { property: 'find' }, // Intended to block usage of Array.prototype.find
+      { property: 'only' } // Intended to block usage of it.only in commits
+    ],
+    'mocha/no-mocha-arrows': 2
+  }
 };