lit.dev-userscript.js

// ==UserScript==
// @name         lit.dev script
// @version      0.1
// @description  Redirect lit.dev pages to new docs
// @match        *://*.lit.dev/*
// ==/UserScript==

(function() {
    'use strict';

    console.log('lit.dev script running, redirecting from old docs...');

    const banner = document.getElementsByTagName('litdev-banner')[0];
    if (banner?.textContent.includes('older version')) {
        const link = banner.getElementsByTagName('a')[0];
        window.location.href = link.href;
    }
})();