youtube-remove-from-liked.js

// I re-typed what I saw in reference 3 below,
// went to Liked videos page on YouTube[1] while logged in,
// pasted that into browser dev tools console (Google Chrome Version 97.0.4692.99 (Official Build) (x86_64)),
// pressed enter, and it seemed to do its thing, for the most part
// (when I refreshed the page, there was still 1 video remaining).

// [1] as of 2022-01-23 that’s at https://www.youtube.com/playlist?list=LL

// context: https://twitter.com/QiaochuYuan/status/1485164256970510340
// references:
// 1. https://www.quora.com/How-can-I-delete-all-liked-YouTube-videos-at-once/answer/Zeeshan-Arshad-34
// 2. https://twitter.com/gene_minkov/status/1485179092991365123
// 3. https://twitter.com/QiaochuYuan/status/1485438430720905219

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function deleteLikedVideos() {
  'use strict';
  var items = document.querySelectorAll('ytd-playlist-video-renderer ytd-menu-renderer > yt-icon-button.dropdown-trigger > button[aria-label]');
  var out;
  for (var i = 0; i < items.length; i++) {
    items[i].click();
    out = setTimeout(function () {
      if (document.querySelector('tp-yt-paper-listbox.style-scope.ytd-menu-popup-renderer').lastElementChild) {
        document.querySelector('tp-yt-paper-listbox.style-scope.ytd-menu-popup-renderer').lastElementChild.click();
      }
    }, 100);
    await sleep(500); // sleep cause browser can not handle the process
    clearTimeout(out);
  }
}

deleteLikedVideos();