// ==UserScript==
// @name         No youtube numpad
// @match        https://www.youtube.com/*
// @author       Stabosa87
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    const keyset = new Set([
        'Digit0','Digit1','Digit2','Digit3','Digit4',
        'Digit5','Digit6','Digit7','Digit8','Digit9',
        'Numpad0','Numpad1','Numpad2','Numpad3','Numpad4',
        'Numpad5','Numpad6','Numpad7','Numpad8','Numpad9'
    ]);

    function typing(el) {
        if (!el) return false;

        const tag = el.tagName;
        return (
            tag === 'INPUT' ||
            tag === 'TEXTAREA' ||
            el.isContentEditable
        );
    }

    function handler(e) {
        if (!keyset.has(e.code)) return;
        if (typing(document.activeElement)) return;

        e.preventDefault();
        e.stopImmediatePropagation();
    }

    document.addEventListener('keydown', handler, true);
})();