Smash that like button (add current YouTube video to liked videos)

like-yt-video.user.js

(() => {
  const likeVideo = () => {
    const [likeButton] = [...document.querySelectorAll('button')]
      .filter(node => (
        typeof node.getAttribute('aria-label') === 'string'
        && node.getAttribute('aria-label').startsWith('like this video')
      ));
  
    let likeAnchor = likeButton;
  
    while (likeAnchor.nodeName !== 'A') likeAnchor = likeAnchor.parentNode;
  
    if (likeButton.getAttribute('aria-pressed') === 'true') {
      console.log('Already liked');
    }
    else if (likeButton.getAttribute('aria-pressed') === 'false') {
      likeAnchor.click();
      console.log('Liked');
    }
    else console.log('Cannot determine like status');
  };
  
  likeVideo();
})();