Twitch Volume Memory - Ultimate Sync

A small script witten by google's gemini to save audio volume levels per channel on twitch.
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// ==UserScript==
// @name         Twitch Volume Memory - Ultimate Sync
// @namespace    http://tampermonkey.net/
// @version      1.6
// @description  A small script witten by google's gemini to save audio volume levels per channel on twitch.
// @author       Gemini
// @match        https://www.twitch.tv/*
// @grant        none
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    let lastUrl = location.href;

    // Helper to show the purple notification
    const showNotify = (msg) => {
        let notify = document.getElementById('vol-mem-notify');
        if (!notify) {
            notify = document.createElement('div');
            notify.id = 'vol-mem-notify';
            notify.style = "position:fixed; top:80px; right:20px; background:rgba(145,71,255,0.9); color:white; padding:10px 15px; border-radius:5px; z-index:9999; font-weight:bold; pointer-events:none; transition:opacity 0.5s; font-family: sans-serif;";
            document.body.appendChild(notify);
        }
        notify.innerText = msg;
        notify.style.opacity = "1";
        setTimeout(() => { notify.style.opacity = "0"; }, 2500);
    };

    // Helper to bypass React's internal state
    function setNativeValue(element, value) {
        const valueSetter = Object.getOwnPropertyDescriptor(element, 'value').set;
        const prototype = Object.getPrototypeOf(element);
        const prototypeValueSetter = Object.getOwnPropertyDescriptor(prototype, 'value').set;

        if (valueSetter && valueSetter !== prototypeValueSetter) {
            prototypeValueSetter.call(element, value);
        } else {
            valueSetter.call(element, value);
        }
        element.dispatchEvent(new Event('input', { bubbles: true }));
        element.dispatchEvent(new Event('change', { bubbles: true }));
    }

    const getStreamer = () => {
        const path = window.location.pathname.split('/');
        const invalid = ["", "directory", "search", "settings", "videos", "u"];
        return path[1] && !invalid.includes(path[1]) ? path[1] : null;
    };

    const applyVolume = () => {
        const streamer = getStreamer();
        const slider = document.querySelector('input[data-a-target="player-volume-slider"]');
        const saved = localStorage.getItem(`vol_${streamer}`);

        if (slider && saved !== null && streamer) {
            setNativeValue(slider, saved);
            showNotify(`🔊 ${streamer}: ${Math.round(saved * 100)}%`);
        }
    };

    // Save volume when the slider is moved
    document.addEventListener('input', (e) => {
        if (e.target.getAttribute('data-a-target') === 'player-volume-slider') {
            const streamer = getStreamer();
            if (streamer) {
                localStorage.setItem(`vol_${streamer}`, e.target.value);
            }
        }
    }, true);

    const observer = new MutationObserver(() => {
        if (location.href !== lastUrl) {
            lastUrl = location.href;
            setTimeout(applyVolume, 2000); // Wait for React to load player
        }

        const slider = document.querySelector('input[data-a-target="player-volume-slider"]');
        if (slider && !slider.dataset.volSet) {
            applyVolume();
            slider.dataset.volSet = "true";
        }
    });

    observer.observe(document.body, { childList: true, subtree: true });
})();