Source: lib/polyfill/typed_array.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2025 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  7. goog.provide('shaka.polyfill.TypedArray');
  9. goog.require('shaka.polyfill');
  11. /**
  12.  * @summary A polyfill to provide missing TypedArray methods for older
  13.  * browsers (indexOf/lastIndexOf/includes).
  14.  * @export
  15.  */
  16. shaka.polyfill.TypedArray = class {
  17.   /**
  18.    * Install the polyfill if needed.
  19.    * @export
  20.    */
  21.   static install() {
  22.     const typedArrays = [
  23.       Uint8Array, Uint8ClampedArray, Uint16Array, Uint32Array,
  24.       Int8Array, Int16Array, Int32Array, Float32Array, Float64Array,
  25.     ];
  26.     for (const typedArray of typedArrays) {
  27.       // eslint-disable-next-line no-restricted-syntax
  28.       if (!typedArray.prototype.indexOf) {
  29.         // eslint-disable-next-line no-restricted-syntax
  30.         typedArray.prototype.indexOf = shaka.polyfill.TypedArray.indexOf_;
  31.       }
  32.       // eslint-disable-next-line no-restricted-syntax
  33.       if (!typedArray.prototype.lastIndexOf) {
  34.         // eslint-disable-next-line no-restricted-syntax
  35.         typedArray.prototype.lastIndexOf =
  36.             shaka.polyfill.TypedArray.lastIndexOf_;
  37.       }
  38.       // eslint-disable-next-line no-restricted-syntax
  39.       if (!typedArray.prototype.includes) {
  40.         // eslint-disable-next-line no-restricted-syntax
  41.         typedArray.prototype.includes = shaka.polyfill.TypedArray.includes_;
  42.       }
  43.     }
  44.   }
  46.   /**
  47.    * @param {number} searchElement
  48.    * @param {number} fromIndex
  49.    * @return {number}
  50.    * @this {TypedArray}
  51.    * @private
  52.    */
  53.   static indexOf_(searchElement, fromIndex) {
  54.     // eslint-disable-next-line no-restricted-syntax
  55.     return Array.prototype.indexOf.call(this, searchElement, fromIndex);
  56.   }
  58.   /**
  59.    * @param {number} searchElement
  60.    * @param {number} fromIndex
  61.    * @return {number}
  62.    * @this {TypedArray}
  63.    * @private
  64.    */
  65.   static lastIndexOf_(searchElement, fromIndex) {
  66.     // eslint-disable-next-line no-restricted-syntax
  67.     return Array.prototype.lastIndexOf.call(this, searchElement, fromIndex);
  68.   }
  70.   /**
  71.    * @param {number} searchElement
  72.    * @param {number} fromIndex
  73.    * @return {boolean}
  74.    * @this {TypedArray}
  75.    * @private
  76.    */
  77.   static includes_(searchElement, fromIndex) {
  78.     return this.indexOf(searchElement, fromIndex) !== -1;
  79.   }
  80. };
  82. shaka.polyfill.register(shaka.polyfill.TypedArray.install);