Source: lib/polyfill/symbol.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  6. goog.provide('shaka.polyfill.Symbol');
  8. goog.require('shaka.log');
  9. goog.require('shaka.polyfill');
  11. /**
  12.  * @summary A polyfill to provide Symbol.prototype.description in all browsers.
  13.  * See: https://caniuse.com/mdn-javascript_builtins_symbol_description
  14.  * @export
  15.  */
  16. shaka.polyfill.Symbol = class {
  17.   /**
  18.    * Install the polyfill if needed.
  19.    * @export
  20.    */
  21.   static install() {
  22.     shaka.log.debug('Symbol.install');
  24.     // eslint-disable-next-line no-restricted-syntax
  25.     const proto = Symbol.prototype;
  27.     if (!('description' in proto)) {
  28.       Object.defineProperty(proto, 'description', {
  29.         get: shaka.polyfill.Symbol.getSymbolDescription_,
  30.       });
  31.     }
  32.   }
  34.   /**
  35.    * @this {Symbol}
  36.    * @return {(string|undefined)}
  37.    * @private
  38.    */
  39.   static getSymbolDescription_() {
  40.     const m = /\((.*)\)/.exec(this.toString());
  41.     return m ? m[1] : undefined;
  42.   }
  43. };
  46. shaka.polyfill.register(shaka.polyfill.Symbol.install);