refactor: use es6 classes

Adds babel and uses es6 classes instead of class.extend

.eslintrc.json

@@ -1,5 +1,4 @@
 {
-
-   "extends": "@silvermine/eslint-config/node"
-
+   "extends": "@silvermine/eslint-config/node",
+   "parser": "babel-eslint"
 }

Gruntfile.js

@@ -2,9 +2,6 @@
  * Copyright (c) 2017 Jeremy Thomerson
  * Licensed under the MIT license.
  */
-
-'use strict';
-
 var path = require('path'),
     getCodeVersion = require('silvermine-serverless-utils/src/get-code-version');
 
@@ -52,6 +49,26 @@ module.exports = function(grunt) {
          main: {
             src: config.js.standalone,
             dest: config.dist.js.bundle,
+            options: {
+               transform: [
+                  [
+                     'babelify',
+                     {
+                        presets: [
+                           [
+                              '@babel/preset-env',
+                              {
+                                 debug: true,
+                                 useBuiltIns: 'usage',
+                                 shippedProposals: true,
+                                 corejs: 3,
+                              },
+                           ],
+                        ],
+                     },
+                  ],
+               ],
+            },
          },
       },
 

commitlint.config.js

@@ -1,5 +1,3 @@
-'use strict';
-
 module.exports = {
    extends: [ '@silvermine/standardization/commitlint.js' ],
 };

package.json

@@ -33,9 +33,17 @@
   },
   "homepage": "https://github.com/silvermine/videojs-quality-selector#readme",
   "devDependencies": {
+    "@babel/core": "7.13.16",
+    "@babel/preset-env": "7.13.15",
+    "@commitlint/cli": "8.3.5",
+    "@commitlint/travis-cli": "8.3.5",
     "@silvermine/eslint-config": "3.0.1",
     "@silvermine/standardization": "2.0.0",
     "autoprefixer": "8.6.5",
+    "babelify": "10.0.0",
+    "babel-eslint": "10.1.0",
+    "check-node-version": "4.0.3",
+    "core-js": "3.11.0",
     "coveralls": "3.0.3",
     "eslint": "6.8.0",
     "expect.js": "0.3.1",
@@ -62,7 +70,6 @@
     "video.js": ">=6.0.0"
   },
   "dependencies": {
-    "class.extend": "0.9.1",
     "underscore": "1.13.1"
   }
 }

src/js/components/QualityOption.js

@@ -1,5 +1,3 @@
-'use strict';
-
 var _ = require('underscore'),
     events = require('../events');
 

src/js/components/QualitySelector.js

@@ -1,5 +1,3 @@
-'use strict';
-
 var _ = require('underscore'),
     events = require('../events'),
     qualityOptionFactory = require('./QualityOption'),

src/js/events.js

@@ -1,9 +1,5 @@
-'use strict';
-
 module.exports = {
-
    QUALITY_REQUESTED: 'qualityRequested',
    QUALITY_SELECTED: 'qualitySelected',
    PLAYER_SOURCES_CHANGED: 'playerSourcesChanged',
-
 };

src/js/index.js

@@ -1,5 +1,3 @@
-'use strict';
-
 var _ = require('underscore'),
     events = require('./events'),
     qualitySelectorFactory = require('./components/QualitySelector'),

src/js/middleware/SourceInterceptor.js

@@ -1,5 +1,3 @@
-'use strict';
-
 var _ = require('underscore'),
     events = require('../events');
 

src/js/standalone.js

@@ -1,3 +1 @@
-'use strict';
-
 require('./index')();

src/js/util/SafeSeek.js

@@ -1,17 +1,13 @@
-'use strict';
-
-var Class = require('class.extend');
-
-module.exports = Class.extend({
-   init: function(player, seekToTime) {
+class SafeSeek {
+   constructor(player, seekToTime) {
       this._player = player;
       this._seekToTime = seekToTime;
       this._hasFinished = false;
       this._keepThisInstanceWhenPlayerSourcesChange = false;
       this._seekWhenSafe();
-   },
+   }
 
-   _seekWhenSafe: function() {
+   _seekWhenSafe() {
       var HAVE_FUTURE_DATA = 3;
 
       // `readyState` in Video.js is the same as the HTML5 Media element's `readyState`
@@ -35,9 +31,9 @@ module.exports = Class.extend({
       } else {
          this._seek();
       }
-   },
+   }
 
-   onPlayerSourcesChange: function() {
+   onPlayerSourcesChange() {
       if (this._keepThisInstanceWhenPlayerSourcesChange) {
          // By setting this to `false`, we know that if the player sources change again
          // the change did not originate from a quality selection change, the new sources
@@ -47,9 +43,9 @@ module.exports = Class.extend({
       } else {
          this.cancel();
       }
-   },
+   }
 
-   onQualitySelectionChange: function() {
+   onQualitySelectionChange() {
       // `onPlayerSourcesChange` will cancel this pending seek unless we tell it not to.
       // We need to reuse this same pending seek instance because when the player is
       // paused, the `preload` attribute is set to `none`, and the user selects one
@@ -60,21 +56,23 @@ module.exports = Class.extend({
       if (!this.hasFinished()) {
          this._keepThisInstanceWhenPlayerSourcesChange = true;
       }
-   },
+   }
 
-   _seek: function() {
+   _seek() {
       this._player.currentTime(this._seekToTime);
       this._keepThisInstanceWhenPlayerSourcesChange = false;
       this._hasFinished = true;
-   },
+   }
 
-   hasFinished: function() {
+   hasFinished() {
       return this._hasFinished;
-   },
+   }
 
-   cancel: function() {
+   cancel() {
       this._player.off('canplay', this._seekFn);
       this._keepThisInstanceWhenPlayerSourcesChange = false;
       this._hasFinished = true;
-   },
-});
+   }
+}
+
+module.exports = SafeSeek;

tests/Placeholder.test.js

@@ -1,5 +1,3 @@
-'use strict';
-
 var expect = require('expect.js');
 
 describe('Everything', function() {