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Youtube Resumer

Updates the url so that it contains "?t={time}" corresponding to video.currentTime.

As of 2021-10-06. See the latest version.

// ==UserScript==
// @name        Youtube Resumer
// @description Updates the url so that it contains "?t={time}" corresponding to video.currentTime.
// @version     1
// @match       https://www.youtube.com/watch?*
// @grant       none
// @namespace https://greasyfork.org/users/206408
// ==/UserScript==

(async () => {

    function l(message){
        console.log(`[Youtube Resumer] ${message}`)
    }

    l('starting')

    const video = document.querySelector('video');
    video.addEventListener('timeupdate', (event) => {
        l(`duration changed: ${video.currentTime}`)
        const time = parseInt(video.currentTime)
        const url = new URL(window.location.href)
        url.searchParams.set('t', time)
        window.history.replaceState(null, null, url);
    })
})();