Parse Xbox GamePass availability and display on DekuDeals

xbgp-dekudeals.js

/* XBOX GAME PASS LIST PAGE 
   https://www.xbox.com/en-US/xbox-game-pass/games
*/

// Scrape XBGP Data (run on each page)
var titles = [...document.getElementsByClassName("x1GameName")].map(a => a.innerText.replace(/( - Windows 10 Edition)|( - Xbox One Edition)|( - Windows 10)|( for Windows 10)|( \(Windows\))/, ''));
var availability = [...[...[...document.getElementsByClassName("availability")]].map(a => a.getElementsByClassName("c-glyph"))].map(a => [...a].map(b => b.ariaLabel));
var gpMap = JSON.parse(window.localStorage.getItem("xbgp", gpMap) || '{}');

for(var i = 0; i < titles.length; i++) {
    if(gpMap[titles[i]]) {
        gpMap[titles[i]] = gpMap[titles[i]].concat(availability[i]);
    } else {
        gpMap[titles[i]] = availability[i];
    }
}

window.localStorage.setItem("xbgp", JSON.stringify(gpMap))


/* DEKUDEALS GAME PAGE 
   e.g. https://www.dekudeals.com/items/ori-and-the-blind-forest-de
*/

// Calculate data
var gpMap = JSON.parse(window.localStorage.getItem("xbgp", gpMap) || '{}');  // not stored cross site
var title = [...document.getElementsByClassName("display-5")][0].innerText;
var availability = gpMap[title] || '';

// Insert XBGP element
[...document.getElementsByClassName("details list-group")][0].insertAdjacentHTML('afterBegin', `<li class="list-group-item"><strong>GamePass Availability:</strong>[` + availability + `]</li>`);