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IGG-Games show last edit date

Show the last edit date of the game on IGG-Games

// ==UserScript==
// @name         IGG-Games show last edit date
// @namespace    https://github.com/Alistair1231/my-userscripts/
// @version      0.0.5
// @description  Show the last edit date of the game on IGG-Games
// @author       Alistair1231
// @icon         https://icons.duckduckgo.com/ip2/igg-games.com.ico
// @grant        none
// @match        https://igg-games.com/*
// @license MIT
// ==/UserScript==
// https://openuserjs.org/scripts/Alistair1231/IGG-Games_show_last_edit_date
// https://greasyfork.org/en/scripts/468235-igg-games-show-last-edit-date
(async function() {

  function tryGetDate() {
      return new Promise((resolve, reject) => {
        const preDate = document.querySelector("article meta[property*='date']");
        if (preDate === null) {
          setTimeout(tryGetDate, 500);
        } else {
          resolve(preDate);
        }
      });
    }
  
  var preDate= await tryGetDate()
  
  var dateString = new Date(preDate.content).toLocaleDateString("en-US", {
  year: "numeric",
  month: "long",
  day: "numeric"
  });
  
  // element after heading
  var whereToAdd = document.querySelector("article.post h1").nextElementSibling;
  
  // reverse order because of prepend()
  var whatToAdd = [
      document.createElement('br'),
      document.createElement('br'),
      `(last update ${dateString})`,
  ];
  whatToAdd.forEach(x => whereToAdd.prepend(x));
  
  })();