Drop node.js v8 support (#4164)

.eslintrc.yml

@@ -28,7 +28,7 @@ overrides:
       - test/integration/helpers.js
       - lib/growl.js
     parserOptions:
-      ecmaVersion: 2017
+      ecmaVersion: 2018
     env:
       browser: false
   - files:
@@ -83,7 +83,7 @@ overrides:
   - files:
       - test/**/*.mjs
     parserOptions:
-      ecmaVersion: 2017
+      ecmaVersion: 2018
       sourceType: module
 
   - files:

.github/CONTRIBUTING.md

@@ -42,7 +42,7 @@ Follow these steps to get going. If you are having trouble, don't be afraid to [
 
 > PRO TIP: After `npm install`, run `npm start` to see a list of commands which can be run with `npm start <command>` (powered by [nps](https://npm.im/nps)).
 
-1. [Install Node.js 8.x or newer](https://nodejs.org/en/download/).
+1. [Install Node.js 10.x or newer](https://nodejs.org/en/download/).
    - If you're new to installing Node, a tool like [nvm](https://github.com/creationix/nvm#install-script) can help you manage multiple version installations.
    - You will need [Google Chrome](https://www.google.com/chrome/) to run browser-based tests locally.
 1. Follow [Github's documentation](https://help.github.com/articles/fork-a-repo/) on setting up Git, forking and cloning.

.travis.yml

@@ -46,9 +46,6 @@ jobs:
     - <<: *node
       node_js: '10'
 
-    - <<: *node
-      node_js: '8'
-
     - script: npm start test.bundle test.browser
       # XXX: update when canvas supplies a prebuilt binary for Node.js v12.x
       node_js: 10
@@ -83,9 +80,6 @@ jobs:
     - <<: *smoke
       node_js: '10'
 
-    - <<: *smoke
-      node_js: '8'
-
     - stage: precache
       script: true
 

appveyor.yml

@@ -15,7 +15,6 @@ environment:
     - nodejs_version: '13'
     - nodejs_version: '12'
     - nodejs_version: '10'
-    - nodejs_version: '8'
 matrix:
   fast_finish: true
 install:

docs/README.md

@@ -6,7 +6,7 @@ _So you wanna build the site?_
 
 ## Prerequisites
 
-- Node.js v8.x or greater
+- Node.js v10.x or greater
 
 ## Development
 

docs/index.md

@@ -99,7 +99,7 @@ or as a development dependency for your project:
 $ npm install --save-dev mocha
 ```
 
-> As of v7.0.0, Mocha requires Node.js v8.0.0 or newer.
+> As of v8.0.0, Mocha requires Node.js v10.0.0 or newer.
 
 ## Getting Started
 

package.json

@@ -34,7 +34,7 @@
     "test": "./test"
   },
   "engines": {
-    "node": ">= 8.0.0"
+    "node": ">= 10.0.0"
   },
   "scripts": {
     "prepublishOnly": "nps test clean build",