Script for Userscripts browser extension to skip ads on Youtube.

Skip YouTube Ads.js

// ==UserScript==
// @name        Skip YouTube Ads
// @description This is your new file, start writing code
// @match        *://*.youtube.com/*
// ==/UserScript==

function skipAd() {
    const adPlaying = document.body.querySelector(".ad-showing");
    
    if (!adPlaying) {
        console.info("ad not found");
        return;
    }
    
    const button = document.querySelector(".ytp-ad-skip-button-text");
    
    if (button) {
        button?.click();
        console.info("skip ad button clicked");
        return;
    }
    
    const video = document.querySelector("video");
        
    if (video) {
        video.currentTime = video.duration - 1;
        video.playbackRate = 20;
        console.info("ad video skipped");
    }
}

function connect() {
    const targetNode = document.body;
    // Options for the observer (which mutations to observe)
    const config = { attributes: true, childList: true, subtree: true };
    observer.observe(targetNode, config);
}

// Callback function to execute when mutations are observed
function callback(mutationsList, observer) {
    // Use traditional 'for loops' for IE 11
    for (const mutation of mutationsList) {
        if (mutation.type === "attributes" && mutation.attributeName === "class" && mutation.target.classList.contains("ad-showing")) {
            observer.disconnect();
            console.info("skipping ad …");
            setTimeout(skipAd, 500);
            setTimeout(connect, 2000);
        }
    }
};

// Create an observer instance linked to the callback function
const observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
connect();