Clean YouTube Watch Later Videos with Limit and Random Delay

youtube_clean_watch_later_videos.js

(async function() {
   const REMOVE_BUTTON_TEXT = 'Remove from Watch later'
   // de-DE:      const REMOVE_BUTTON_TEXT = 'Aus "Später ansehen" entfernen'
   // pt-BR:      const REMOVE_BUTTON_TEXT = 'Remover de Assistir mais tarde'
   // swe-SE:     const REMOVE_BUTTON_TEXT = 'Ta bort från Titta senare'
   // zh-Hans-CN: const REMOVE_BUTTON_TEXT = '从稍后观看中移除'
   // ru-RU:      const REMOVE_BUTTON_TEXT = 'Удалить из плейлиста "Смотреть позже"'

   const playlistName = document.querySelector('#title a').text

   const limit = +prompt(`How many videos do you want to remove from ${playlistName}?`)
   if (!limit) return

   console.info('start...')
   let count = 0

   while (true) {
      const videos = document.querySelectorAll('#primary ytd-playlist-video-renderer')
      if (videos.length == 0) break

      for (const videoElement of videos) {
         const videoTitle = videoElement.querySelector('a#video-title')
         console.info(`Remove Video\n` + `  Title: ${videoTitle.innerText}\n` + `  URL: ${videoTitle.href}`)

         const actionMenuButton = videoElement.querySelector('#menu #button')
         console.debug('click actionMenuButton', actionMenuButton)
         actionMenuButton.click()

         const removeButton = await untilDefined(() => {
            for (const actionMenu of [...document.querySelectorAll('ytd-popup-container > tp-yt-iron-dropdown')]) {
               if ((actionMenu) => actionMenu.style.display !== 'none') {
                  for (const actionButton of [...actionMenu.querySelectorAll('tp-yt-paper-item')]) {
                     if (actionButton.innerText.trim().toLowerCase() === REMOVE_BUTTON_TEXT.toLowerCase()) {
                        return actionButton
                     }
                  }
               }
            }
            console.debug('wait for removeButton')
         })
         console.debug('click removeButton', removeButton)
         removeButton.click()

         count++
         if (count >= limit) break

         const randDelay = 1000 + Math.random() * 400
         await sleep(randDelay)
      }
      if (count >= limit) break
   }
   console.info('done!')

   // === util functions ========================================================

   async function sleep(timeout) {
      return new Promise((res) => setTimeout(res, timeout))
   }

   async function untilDefined(factory, checkInterval = 100) {
      while (true) {
         const value = factory()
         if (value != null) return value
         await sleep(checkInterval)
      }
   }
})()