Twitter promoted tweets blocker for Tampermonkey

main.js

// ==UserScript==
// @name         Twitter promoted blocker
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Block twitter promoted tweets at home timeline
// @author       tizee
// @match        https://twitter.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=twitter.com
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  const hiddenTweets = new WeakSet();

  function watchTweetNodes(mutationList) {
    mutationList.forEach(function (mutationRecord) {
      mutationRecord.addedNodes.forEach(function (node) {
        if (node && typeof node.querySelector == "function") {
          const tweet = node.querySelector(
            `div[data-testid="cellInnerDiv"] article[data-testid="tweet"]`
          );
          if (tweet) {
            if (hiddenTweets.has(tweet)) {
              return;
            }

            const spans = tweet.querySelectorAll("span");
            if (
              [...spans]
                .map((span) => span.innerHTML)
                .some((txt) => txt == "Promoted" || txt == "Ad")
            ) {
              tweet.style.display = "none";
              console.debug("block promoted tweet", tweet);
              hiddenTweets.add(tweet);
            }
          }
        }
      });
    });
  }

  const regex = /^https:\/\/twitter.com\/.*$/;

  const observer = new MutationObserver(function (mutationList, observer) {
    if (!regex.test(window.location.href)) {
      return;
    }

    watchTweetNodes(mutationList);
  });

  observer.observe(document.documentElement, {
    childList: true,
    subtree: true,
  });
})();