YouTube-Default-Channel-Sort-Latest

// ==UserScript==
// @name         YouTube-Default-Channel-Sort-Latest
// @namespace    https://github.com/bidaumm/
// @version      0.2
// @description  YouTube-Default-Channel-Sort-Latest
// @author       bidaumm
// @match        https://www.youtube.com/*videos
// @match        https://www.youtube.com/*streams
// @match        https://www.youtube.com/*shorts
// @grant        none
// ==/UserScript==

function waitForElm(selector) {
    return new Promise(resolve => {
        if (document.querySelector(selector)) {
            return resolve(document.querySelector(selector));
        }

        const observer = new MutationObserver(mutations => {
            if (document.querySelector(selector)) {
                resolve(document.querySelector(selector));
                observer.disconnect();
            }
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
    });
}

document.body.addEventListener('yt-navigate-finish', () => {
    waitForElm('yt-formatted-string[title="Latest"]').then((elm) => {
        console.log('Element is ready');
        console.log(elm.textContent);
        elm.click();
    });
});