Clear Youtube Watch Later Playlist

clearWL.js

// open https://www.youtube.com/playlist?list=WL
(async function() {
const delay = (ms = 100) => new Promise((resolve) => {
    setTimeout(() => {
        resolve(true);
    }, ms)
});

const loadAll = () => new Promise(async (resolve) => {
    let node = document.querySelector('ytd-continuation-item-renderer');
    while(node) {
        node.scrollIntoView();
        await delay(300);
        node = document.querySelector('ytd-continuation-item-renderer');
    }
    resolve(true);
});

const saveLastVideoId = () => {
    localStorage.setItem('_lastVideoId', '');

    const { __data: { data: { videoId } = {} } = {} } = [...document.querySelectorAll('ytd-playlist-video-renderer')]
        .filter(({ dataset: { title } }) => title !== '[Private video]')
        .pop()
        ;
    console.log('lastVideoId', videoId);        
    if (videoId) {
        localStorage.setItem('_lastVideoId', videoId);
    }
};

const removeAll = async () => {
    const nodes = [...document.querySelectorAll('ytd-playlist-video-renderer')];
    let node = nodes.pop();
    let counter = 0;
    node = nodes.pop();
    let menus;
    let button;
    while(node) {
        console.log(node);
        node.scrollIntoView();
        button = node.querySelector('#menu').querySelector('yt-icon-button');
        console.log(button);
        if (!button) {
          continue;
        }
        button.focus();
        button.click();

        menus = document.querySelector('ytd-popup-container>iron-dropdown');
        while(!menus) {
          await delay(300);
          menus = document.querySelector('ytd-popup-container>iron-dropdown');
        }
        await delay(300);
        menus = [...menus.querySelectorAll('ytd-menu-service-item-renderer')]
          .find(({ __data: { icon_ } }) => icon_ === 'yt-icons:delete');

        menus.click();

        await delay(500);

        node = nodes.pop();
    }
}

await loadAll();
console.log('loaded');
saveLastVideoId();
console.log('last videoId is saved');
await removeAll();

})();