Youtube to Youtube gaming.user.js

// ==UserScript==
// @name         Youtube to Youtube gaming
// @namespace    http://dykam.nl/
// @version      0.1
// @description  Redirects the YT watch page to the better YT gaming watch page
// @author       Dykam
// @match        https://www.youtube.com/*
// @grant        none
// ==/UserScript==

var core = function(e) {
    document.location.host = "gaming.youtube.com";
};

document.addEventListener('DOMContentLoaded', function() {
    var masthead_user = document.querySelector("#yt-masthead-user");
    var upload_button = document.querySelector("#upload-btn");
    var gaming_button = document.createElement("a");
    gaming_button.classList.add.apply(gaming_button.classList, upload_button.classList);
    gaming_button.style.marginRight = "15px";
    gaming_button.addEventListener("click", function(e) {
        e.stopPropagation();
        core();
    });
    var gaming_button_text = document.createElement("span");
    gaming_button_text.innerText = "Gaming";
    gaming_button_text.classList.add.apply(gaming_button_text.classList, upload_button.children[0].classList);
    gaming_button.appendChild(gaming_button_text);
    masthead_user.insertBefore(gaming_button, upload_button);
});

/** why no worky
var _wr = function(type) {
    var orig = history[type];
    return function() {
        var rv = orig.apply(this, arguments);
        var e = new Event(type);
        e.arguments = arguments;
        window.dispatchEvent(e);
        return rv;
    };
};

history.pushState = _wr('pushState'), history.replaceState = _wr('replaceState');

setTimeout(function() {
    history.pushState = _wr('pushState'), history.replaceState = _wr('replaceState');
}, 1000);

window.addEventListener('replaceState', core);
window.addEventListener('pushState', core);
**/

// Don't redirect if url has a timestamp, YT Gaming doesn't support it.
if(document.location.pathname == "/watch") {
    if(!/[?&](t=\d|noredirect\b)/.test(document.location.search)) {
        core();
    } else {return;
        var n = new Notification("Gaming", {
            body: "No automatic redirect to TY Gaming, as jumping to a timestamp is unsupported by YT gaming."
        });
        setTimeout(n.close.bind(n), 4000);
    }
}