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YouTube Flag Tracker

Track changes in YouTube's experiment flags

  1. // ==UserScript==
  2. // @name        YouTube Flag Tracker
  3. // @namespace   Violentmonkey Scripts
  4. // @version     1.2.2
  5. // @description Track changes in YouTube's experiment flags
  6. // @include     http*://www.youtube.com/*
  7. // @grant       unsafeWindow
  8. // @grant       GM_setValue
  9. // @grant       GM_getValue
  10. // @run-at      document-end
  11. // ==/UserScript==
  12.  
  13. function save(key, data) {
  14.  
  15.     if (!Object.keys(data).length) {
  16.         return;
  17.     }
  18.  
  19.     if (key === "changes") {
  20.         const changes = GM_getValue("changes", []);
  21.         changes.unshift(data);
  22.         data = changes;
  23.     }
  24.  
  25.     GM_setValue(key, data);
  26. }
  27.  
  28. function isEqual(a, b) {
  29.  
  30.     if (Array.isArray(a) && Array.isArray(b)) {
  31.         return (
  32.             a.length === b.length &&
  33.             JSON.stringify(a) === JSON.stringify(b)
  34.         );
  35.     }
  36.  
  37.     return a === b;
  38. }
  39.  
  40. function diffChecker(prev = {}, curr = {}) {
  41.  
  42.     let changes = {};
  43.  
  44.     const allKeys = new Set([...Object.keys(prev), ...Object.keys(curr)]);
  45.  
  46.     allKeys.forEach(key => {
  47.  
  48.         const prevVal = prev[key];
  49.         const currVal = curr[key];
  50.  
  51.         if (prevVal === undefined) {
  52.             changes[key] = { type: "added", value: currVal };
  53.         }
  54.  
  55.         else if (currVal === undefined) {
  56.             changes[key] = { type: "removed" };
  57.         }
  58.  
  59.         else if (!isEqual(prevVal, currVal)) {
  60.             changes[key] = { type: "modified", value: currVal };
  61.         }
  62.     });
  63.  
  64.     return changes;
  65. }
  66.  
  67. function updateStorage(currentFlags) {
  68.  
  69.     const previousFlags = GM_getValue("flags", {});
  70.     const changes = diffChecker(previousFlags, currentFlags);
  71.  
  72.     const numChanges = Object.keys(changes).length;
  73.     const maxChanges = Object.keys(previousFlags).length / 2;
  74.  
  75.     if (!maxChanges || numChanges <= maxChanges) {
  76.         save("changes", changes);
  77.         save("flags", currentFlags);
  78.     }
  79. }
  80.  
  81. function observeFlags() {
  82.  
  83.     const observer = new MutationObserver(() => {
  84.  
  85.         const flags = unsafeWindow.yt?.config_?.EXPERIMENT_FLAGS;
  86.  
  87.         if (flags) {
  88.             observer.disconnect();
  89.             updateStorage(flags);
  90.         }
  91.     });
  92.  
  93.     observer.observe(document.body, { childList: true, subtree: true });
  94. }
  95.  
  96.  
  97. observeFlags();

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