Creates link to new SFDC Release Notes from old Release Notes

sfdc-new-release-notes.user.js

// ==UserScript==
// @name         Redirect to new SFDC release notes
// @namespace    https://gist.github.com/gbutt/e62c691887887b8287b382455c0194c9
// @version      0.1
// @description  Injects a link to new SFDC Release Notes into the old Release Notes page
// @author       Greg Butt
// @match        https://releasenotes.docs.salesforce.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const paths = location.pathname.split('/');

    let newUrl = 'https://help.salesforce.com/articleView?id=release-notes.' + paths[4] + '&type=5';

    if (paths[2] === 'spring21') {
        newUrl += '&release=230';
    }
    else if (paths[2] === 'winter21') {
        newUrl += '&release=228';
    }
    else if (paths[2] === 'summer20') {
        newUrl += '&release=226';
    }

    const linkBlock = document.createElement('div');
    linkBlock.innerHTML = `<a href="${newUrl}">New Help Article</a>`;
    document.querySelector('#sfdc-topic').prepend(linkBlock);
})();