Get youtube info

.user.js

const getYoutubeData = () => {
  const videoElem = document.querySelector('ytd-watch-flexy.ytd-page-manager');
  const titleElem = document.querySelector('title');
  
  const video = videoElem?.getAttribute?.('video-id') ?? '';
  const videoString = `Video=${video}`;
  
  const title = titleElem?.innerText ?? '';
  const titleFormatted = title?.trim?.()?.replace?.(' - YouTube', '').replace?.(/ /g, '_');
  const titleString = `Title=${titleFormatted}`;
  
  // guard against incomplete data
  if (!video || !title) return '';
  
  return `${videoString},${titleString},COMMAND`;
};

const aggregateYoutubeData = () => {
  const youtubeData = window.localStorage.getItem('youtubeData');
  const newYoutubeData = getYoutubeData();
  const newAggregateString = `${youtubeData || ''}${!!youtubeData ? '\n' : ''}${getYoutubeData()}`
  
  // guard against incomplete data or duplicates
  if (!newYoutubeData || youtubeData?.includes?.(newYoutubeData)) return;
  
  window.localStorage.setItem('youtubeData', newAggregateString);
};