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Native Promise for YouTube

YouTube replaced Promise with polyfill in some old browsers.

当前为 2023-06-22 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Native Promise for YouTube
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.1.4
  5. // @license      MIT
  6. // @description  YouTube replaced Promise with polyfill in some old browsers.
  7. // @author       CY Fung
  8. // @match        https://*.youtube.com/*
  9. // @match        https://www.youtube-nocookie.com/embed/*
  10. // @run-at       document-start
  11. // @grant        none
  12. // @unwrap
  13. // @allFrames
  14. // @inject-into  page
  15. // @compatible   firefox Firefox >= 52 && Firefox < 69
  16. // @compatible   edge Edge >= 15 && Edge < 79
  17. // ==/UserScript==
  18.  
  19. (function () {
  20.     'use strict';
  21.  
  22.     if (typeof PromiseRejectionEvent !== 'function') {
  23.  
  24.         /*
  25.         
  26.             Minimum Requirement:
  27.                 async ()=>{}: Chrome 55, Edge 15, Safari 11, Firefox 52, Opera 42
  28.             
  29.             Target Browsers below the following versions:
  30.                 PromiseRejectionEvent: Chrome 49, Edge 79, Safari 11, Firefox 69, Opera 36
  31.             
  32.             This script will only work for 
  33.                 Edge >= 15 && Edge < 79
  34.                 Firefox >= 52 && Firefox <= 69
  35.         
  36.         */
  37.  
  38.         try {
  39.  
  40.             const truePromise = (async () => { })().constructor; // suppress polyfill if the old browser can support async arrow function;
  41.  
  42.             window.PromiseRejectionEvent = (() => {
  43.                 throw 'PromiseRejectionEvent is not supported';
  44.             }); // Waterfox Classic does not have "PromiseRejectionEvent"
  45.  
  46.             if (truePromise !== Promise) window.Promise = truePromise; // if the script runs after polyfill.
  47.  
  48.         } catch (e) {
  49.             throw 'Your browser is too old. This script will not work for you';
  50.         }
  51.  
  52.     }
  53.  
  54. })();