chore: remove IE11 support (#160)

BREAKING CHANGE: Internet Explorer is no longer supported.

package.json

@@ -65,21 +65,17 @@
     "@videojs/generator-helpers": "~2.0.1",
     "jsdom": "^16.4.0",
     "karma": "^5.2.3",
-    "rollup": "^2.36.1",
+    "rollup": "^2.38.0",
     "rollup-plugin-string": "^3.0.0",
     "sinon": "^9.2.3",
-    "videojs-generate-karma-config": "~7.0.0",
-    "videojs-generate-rollup-config": "^6.2.2",
+    "videojs-generate-karma-config": "^8.0.1",
+    "videojs-generate-rollup-config": "~7.0.0",
     "videojs-generator-verify": "~3.0.2",
     "videojs-standard": "^9.0.1"
   },
   "generator-videojs-plugin": {
     "version": "7.7.3"
   },
-  "browserslist": [
-    "defaults",
-    "ie 11"
-  ],
   "lint-staged": {
     "*.js": "vjsstandard --fix",
     "README.md": "doctoc --notitle"

src/playlist-merge.js

@@ -1,5 +1,5 @@
 import { forEachMediaGroup } from '@videojs/vhs-utils/es/media-groups';
-import { findIndex, union } from './utils/list';
+import { union } from './utils/list';
 
 const SUPPORTED_MEDIA_TYPES = ['AUDIO', 'SUBTITLES'];
 // allow one 60fps frame as leniency (arbitrarily chosen)
@@ -82,10 +82,11 @@ export const updateMediaSequenceForPlaylist = ({ playlist, mediaSequence }) => {
  */
 export const updateSequenceNumbers = ({ oldPlaylists, newPlaylists, timelineStarts }) => {
   newPlaylists.forEach((playlist) => {
-    playlist.discontinuitySequence = findIndex(
-      timelineStarts,
-      ({ timeline }) => timeline === playlist.timeline
-    );
+    playlist.discontinuitySequence = timelineStarts.findIndex(function({
+      timeline
+    }) {
+      return timeline === playlist.timeline;
+    });
 
     // Playlists NAMEs come from DASH Representation IDs, which are mandatory
     // (see ISO_23009-1-2012 5.3.5.2).
@@ -116,9 +117,11 @@ export const updateSequenceNumbers = ({ oldPlaylists, newPlaylists, timelineStar
     // Since we don't yet support early available timelines, we don't need to support
     // playlists with no segments.
     const firstNewSegment = playlist.segments[0];
-    const oldMatchingSegmentIndex = findIndex(oldPlaylist.segments, (oldSegment) =>
-      Math.abs(oldSegment.presentationTime - firstNewSegment.presentationTime) <
-        TIME_FUDGE);
+    const oldMatchingSegmentIndex = oldPlaylist.segments.findIndex(function(oldSegment) {
+      return (
+        Math.abs(oldSegment.presentationTime - firstNewSegment.presentationTime) < TIME_FUDGE
+      );
+    });
 
     // No matching segment from the old playlist means the entire playlist was refreshed.
     // In this case the media sequence should account for this update, and the new segments

src/toM3u8.js

@@ -1,5 +1,5 @@
 import { values } from './utils/object';
-import { findIndex, findIndexes } from './utils/list';
+import { findIndexes } from './utils/list';
 import { addSidxSegmentsToPlaylist as addSidxSegmentsToPlaylist_ } from './segment/segmentBase';
 import { byteRangeToString } from './segment/urlType';
 import {
@@ -352,7 +352,11 @@ export const addMediaSequenceValues = (playlists, timelineStarts) => {
   // increment all segments sequentially
   playlists.forEach((playlist) => {
     playlist.mediaSequence = 0;
-    playlist.discontinuitySequence = findIndex(timelineStarts, ({ timeline }) => timeline === playlist.timeline);
+    playlist.discontinuitySequence = timelineStarts.findIndex(function({
+      timeline
+    }) {
+      return timeline === playlist.timeline;
+    });
 
     if (!playlist.segments) {
       return;

src/utils/list.js

@@ -34,40 +34,6 @@ export const findIndexes = (l, key) => l.reduce((a, e, i) => {
   return a;
 }, []);
 
-/**
- * Returns the first index that satisfies the matching function, or -1 if not found.
- *
- * Only necessary because of IE11 support.
- *
- * @param {Array} list - the list to search through
- * @param {Function} matchingFunction - the matching function
- *
- * @return {number} the matching index or -1 if not found
- */
-export const findIndex = (list, matchingFunction) => {
-  for (let i = 0; i < list.length; i++) {
-    if (matchingFunction(list[i])) {
-      return i;
-    }
-  }
-
-  return -1;
-};
-
-/**
- * Returns whether the list contains the search element.
- *
- * Only necessary because of IE11 support.
- *
- * @param {Array} list - the list to search through
- * @param {*} searchElement - the element to look for
- *
- * @return {boolean} whether the list includes the search element or not
- */
-export const includes = (list, searchElement) => {
-  return list.some((element) => element === searchElement);
-};
-
 /**
  * Returns a union of the included lists provided each element can be identified by a key.
  *

test/utils.test.js

@@ -4,9 +4,7 @@ import {
   flatten,
   range,
   from,
-  findIndexes,
-  findIndex,
-  includes
+  findIndexes
 } from '../src/utils/list';
 import { findChildren, getContent } from '../src/utils/xml';
 import {DOMParser} from '@xmldom/xmldom';
@@ -199,26 +197,6 @@ QUnit.test('indexes found', function(assert) {
   ], 'b'), [1, 2]);
 });
 
-QUnit.module('findIndex');
-
-QUnit.test('match', function(assert) {
-  assert.equal(findIndex([2, 'b', 'a'], (el) => el === 'a'), 2, 'returned index');
-});
-
-QUnit.test('no match', function(assert) {
-  assert.equal(findIndex([], (el) => el === 'a'), -1, 'no match');
-});
-
-QUnit.module('includes');
-
-QUnit.test('match', function(assert) {
-  assert.ok(includes([2, 'b', 'a'], 'a'), 'match found');
-});
-
-QUnit.test('no match', function(assert) {
-  assert.notOk(includes([], 'a'), 'no match');
-});
-
 QUnit.module('xml', {
   beforeEach() {
     const parser = new DOMParser();