twitch player cursor hide

script.js

// ==UserScript==
// @name         twitch player cursor hide
// @version      0.1
// @author       kutu
// @match        https://www.twitch.tv/*
// ==/UserScript==

(function() {
    'use strict';

    var playerControls, videoEl;

    setInterval(function() {
        var newPlayerControls = document.querySelector('.player-controls');
        if (!newPlayerControls || playerControls === newPlayerControls) return;
        playerControls = newPlayerControls;
        observer.disconnect();
        observer.observe(playerControls, {attributes: true});
        videoEl = document.querySelector('video').parentElement;
    }, 1000);

    var observer = new MutationObserver(function(list) {
        videoEl.style.cursor = list[0].target.dataset.aVisible === 'false' ? 'none' : 'inherit';
    });
})();