Auto expand t.co links on Tweetdeck website

auto-expand-tco-links-on-tweetdeck-website.user.js

// ==UserScript==
// @name        Auto expand t.co links on Tweetdeck website
// @namespace   https://github.com/lgp171188
// @include     https://tweetdeck.twitter.com/*
// @version     2
// @grant       none
// ==/UserScript==
function expandTwitterShortlinks() {
  var twitter_shortlinks = document.getElementsByClassName('url-ext');
  for (var i = 0; i < twitter_shortlinks.length; i++) {
    var shortlink = twitter_shortlinks[i];
    if (shortlink.classList.contains('tco-url-expanded')) {
      continue;
    } 
    else {
      var actual_url = shortlink.getAttribute('data-full-url');
      shortlink.setAttribute('href', actual_url);
      shortlink.classList.add('tco-url-expanded');
    }
  }
}

function expandTwitterShortimagelinks() {
  var twitter_shortlinks = document.getElementsByClassName('js-media-image-link'),
      i, shortlink, actual_url, tmp;

  for(i = 0; i < twitter_shortlinks.length; i++) {
    shortlink = twitter_shortlinks[i];

    if(shortlink.classList.contains('tco-url-expanded')) {
      continue;
    }

    actual_url = shortlink.getAttribute('style');

    if(actual_url !== null) {
      tmp = actual_url.match(/background-image:url\((.+?)\)/);

      if(tmp !== null) {
        shortlink.setAttribute('href', tmp[1]);
        shortlink.classList.add('tco-url-expanded');
      }
    }
  }
}

function expandTwitterShortimagelinksInMediaEmbeds() {
  var divs = document.getElementsByClassName('med-tray'),
      tco = new RegExp('https?://t.co/[^"]+', 'g'),
      i, medtray, full_link, ih;

  for(i = 0; i < divs.length; i++) {
    medtray = divs[i];

    if(medtray.classList.contains('tco-url-expanded')) {
      continue;
    }

    ih = medtray.innerHTML;
    full_link = ih.match(/img class=\"media-img\" src=\"([^\"]+)\"/);
    if(full_link !== null && full_link.length > 0) {
      medtray.classList.add('tco-url-expanded');
      medtray.innerHTML = ih.replace(tco, full_link[1]);
    }
  }
}

function allOfThem() {
  expandTwitterShortlinks();
  expandTwitterShortimagelinks();
  expandTwitterShortimagelinksInMediaEmbeds();
}

setInterval(allOfThem, 2000);

You should use MutationObserver instead of setInterval()