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Remove the remaining IE 11 polyfills

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We really ought to settle on the *lowest* supported versions of various browsers[1], since that should allow even more clean-up, but given that https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#faq-support *explicitly* lists IE 11 as unsupported after PDF.js version `2.6.347` there's a number of polyfills that are no longer needed.

Based on the MDN compatibility data, this patch thus removes the following polyfills:
 - `String.prototype.startsWith()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith#Browser_compatibility

 - `String.prototype.endsWith()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith#Browser_compatibility

  - `String.prototype.includes()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes#Browser_compatibility

 - `Array.prototype.includes()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Browser_compatibility

  - `Array.from()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from#Browser_compatibility

  - `Object.assign()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Browser_compatibility

  - `Math.log2()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log2#Browser_compatibility

  - `Number.isNaN()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Browser_compatibility

  - `Number.isInteger()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger#Browser_compatibility

  - `Map.prototype.entries()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/entries#Browser_compatibility

  - `Set.prototype.entries()`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/entries#Browser_compatibility

  - `WeakMap`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap#Browser_compatibility

  - `WeakSet`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet#Browser_compatibility

  - `Symbol`, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol#Browser_compatibility

Finally, this patch also attempts to update the compatibility information for the remaining polyfills.

---
[1] For example: It's questionable if Safari 9 should be listed as supported, given that the last release from that branch was in 2016.
This commit is contained in:
Jonas Jenwald 2020-12-14 13:52:11 +01:00
parent 959dc379ee
commit a2874b380a
2 changed files with 12 additions and 138 deletions
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gulpfile.js
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@ -84,7 +84,6 @@ var AUTOPREFIXER_CONFIG = {
"Chrome >= 49", // Last supported on Windows XP
"Firefox >= 52", // Last supported on Windows XP
"Firefox ESR",
"IE >= 11",
"Safari >= 9",
"> 0.5%",
"not dead",