Provides a function to turn Youtube into a whitelist-only mode. This function depends on the BlockTube extension for Chrome/Firefox and should be used in its "Advanced blocking" option. The example values used below will only allow videos coming from the "Om Nom

blocktube_advanced_blocking.js

/**
 * The following function will make BlockTube act in a whitelist-only mode.
 * 
 * Any videos coming from channels other that those you have set in the
 * "allowedChannels" variable will get hidden from display.
 */
(video, objectType) => {
  /*
   * Add here the channel IDs you want to be displayed.
   */
  let allowedChannels = [
    'UCQm7lPfyFeVL8CBGDtT1ARQ'
  ];

  /*
   * Comment out the following line to find channel IDs.
   */
  // console.debug(video);

  /*
   * Add here the titles of the videos you want disallowed.
   */
  let notAllowedNames = [
    "Om Nom Stories",
    "Halloween",
    "Super-Noms' Funny & Epic Adventures"
  ]
  
  /*
   * Add here any objectType values you want displayed.
   */
  let allowedObjectTypes = [
    'args',
    'c4TabbedHeaderRenderer',
    /* 'channelRenderer', */
    'compactVideoRenderer',
    'endScreenVideoRenderer',
    'gridPlaylistRenderer',
    'gridVideoRenderer',
    'guideEntryRenderer',
    'playerOverlayAutoplayRenderer',
    'playlistRenderer',
    'shelfRenderer',
    'videoDetails',
    'videoPrimaryInfoRenderer',
    'videoRenderer',
    'videoSecondaryInfoRenderer'
  ];

  /**
   * =====================
   * Don't modify anything below this line (unless you know what you're doing).
   * ===========================================================================
   */
  if (allowedObjectTypes.indexOf(objectType) === -1) {
    console.debug(objectType);
    return true;
  }

  if (video.channelId) {
    if (allowedChannels.indexOf(video.channelId) !== -1) {
      // Since the channel ID is allowed, it should be displayed.
      if (video.title) {
        for (let i = 0; i < notAllowedNames.length; i++) {
          // console.debug(video.title, notAllowedNames[i], video.title.match(notAllowedNames[i]));
          if (video.title.indexOf(notAllowedNames[i]) !== -1) {
            // Hide videos matching the notAllowedNames values.
            return true;
          }
        }
      }
      return false;
    }
    // Channel not allowed.
    return true;
  }
  // Media doesn't have a channel ID. Let's display it!
  return false;
}