convert-and-redirect-t.me-to-telegram.me.user.js

// ==UserScript==
// @name         Convert and redirect t.me to telegram.me
// @namespace    https://greasyfork.org/en/users/85671-jcunews
// @version      1.0.1
// @license      AGPL v3
// @author       jcunews
// @description  Context: https://www.reddit.com/r/userscripts/comments/xey0b1/request_userscript_which_redirects_tme_to/
// @match        *://*/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(() => {
  if ((location.hostname === "t.me") && !sessionStorage.tmeRedired) {
    sessionStorage.tmeRedired = 1;
    return location.hostname = "telegram.me"
  }
  function chkEle(e) {
    if ((e.tagName === "A") && (e.hostname === "t.me")) {
      e.hostname = "telegram.me"
    } else e.querySelectorAll && e.querySelectorAll('a').forEach(chkEle)
  }
  (new MutationObserver(recs => {
    recs.forEach(rec => rec.addedNodes.forEach(chkEle))
  })).observe(document, {childList: true, subtree: true})
})();