MineCraft Keybind

Rebinds the MineFun.io controls for easier use by MineCraft players
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// ==UserScript==
// @name         MineCraft Keybind
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Rebinds the MineFun.io controls for easier use by MineCraft players
// @author  Qwerty Matthew
// @license  MIT
// @match        https://minefun.io/*
// @match        https://*.minefun.io/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function remapKey(e) {
        // Leave the keys alone if you're typing in chat
        if (document.activeElement.tagName === 'INPUT' || document.activeElement.tagName === 'TEXTAREA') return;

        // 1. CROUCH: Left Shift triggers 'C'.
        if (e.code === 'ShiftLeft') {
            Object.defineProperty(e, 'code', { value: 'KeyC' });
        }
        // DISABLE ORIGINAL C: If you press physical C, stop it from triggering crouch
        else if (e.code === 'KeyC') {
            e.preventDefault();
            e.stopPropagation();
            Object.defineProperty(e, 'code', { value: 'None' });
        }

        // 2. SPRINT: Right Option / Alt (right of spacebar) triggers 'ShiftLeft'
        else if (e.code === 'AltRight') {
            Object.defineProperty(e, 'code', { value: 'ShiftLeft' });
        }

        // 3. INVENTORY: 'E' triggers 'X'.
        else if (e.code === 'KeyE') {
            Object.defineProperty(e, 'code', { value: 'KeyX' });
        }
        // DISABLE ORIGINAL X: If you press physical X, stop it from opening inventory
        else if (e.code === 'KeyX') {
            e.preventDefault();
            e.stopPropagation();
            Object.defineProperty(e, 'code', { value: 'None' });
        }
    }

    // Capture everything instantly on the way down and up
    window.addEventListener('keydown', remapKey, true);
    window.addEventListener('keyup', remapKey, true);

})();