Script that automatically scroll YouTube Shorts

yt-shorts-autoplay.js

// ==UserScript==
// @name     YouTube Shorts autoscroll
// @version  v0.0.2
// @grant    none
// @author   Subhrajit Prusty, liponex
// @description Just auto scroll through youtube shorts
// @match  https://www.youtube.com/*
// ==/UserScript==

(function () {
    let interval = null;
    let oldHref = document.location.href;
    function init() {
        if (!document.location.href.startsWith("https://www.youtube.com/shorts/")) {
            if (interval = null) return;
            clearInterval(interval);
            interval = null;
            return;
        }
        interval = setInterval(function () {
            let player = document.querySelector(".html5-video-player");
            if (!player) {
                console.log("======== No Active player, skipping ======= ")
                return
            }
            let video = player.querySelector("video") // to get video
            let down = document.querySelector("#navigation-button-down")
            video.loop = false

            if (video.currentTime === video.duration) {
                let actualButton = down.getElementsByClassName("style-scope ytd-shorts")
                if (actualButton.length > 0) {
                    console.log("======== Playing next video ======= ")
                    actualButton[0].click()
                }
            }
        }, 1000);
    }

    var observer = new MutationObserver(function(mutations) {
        mutations.forEach(function(mutation) {
            if (oldHref != document.location.href) {
                oldHref = document.location.href;
                init()
            }
        });
    });
    observer.observe(document.querySelector("body"), {
        childList: true,
        subtree: true
    });
    init();
})();