Changes spacebar to toggle modes

fpuzzles-spacebar.js

// ==UserScript==
// @name         Fpuzzles-Spacebar
// @namespace    http://tampermonkey.net/
// @version      1.5
// @description  Changes spacebar and numpad enter to toggle modes
// @author       Rangsk
// @match        https://*.f-puzzles.com/*
// @match        https://f-puzzles.com/*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function() {
    const codes = ['Space', 'NumpadEnter'];

    const doShim = function() {
        'use strict';

        const prevOnKeyDown = document.onkeydown;
        document.onkeydown = function(event) {
            if (!codes.includes(event.code) ||
                disableInputs ||
                popup ||
                testPaused() ||
                toolCosmetics.includes(currentTool) ||
                event.ctrlKey ||
                event.altKey ||
                event.metaKey) {
                prevOnKeyDown(event);
            } else {
                const modeCycle = ['Normal', 'Corner', 'Center', 'Highlight'];
                const modeIndex = modeCycle.indexOf(enterMode);
                setEnterMode(modeCycle[(modeIndex + 1) % modeCycle.length]);
            }
        }
    }

    let intervalId = setInterval(() => {
        if (!document.onkeydown) {
            return;
        }

        clearInterval(intervalId);
        doShim();
    }, 16);
})();