Tampermonkey script to map gamepad buttons to Ludum Dare theme slaughter inputs

slaughterpad.js

// ==UserScript==
// @name         Slaughterpad - Ludum Dare theme slaughter controller mapping
// @version      0.1
// @description  Rip and tear until it is done
// @author       sprngr
// @match        https://ldjam.com/events/ludum-dare/50/theme
// @icon         https://www.google.com/s2/favicons?sz=64&domain=ldjam.com
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // global gamepad object
    let gamepadIndex;

    window.addEventListener('gamepadconnected', (event) => {
        gamepadIndex = event.gamepad.index;
    });

    setInterval(() => {
        if (gamepadIndex !== undefined) {
            // a gamepad is connected and has an index
            const myGamepad = navigator.getGamepads()[gamepadIndex];
            myGamepad.buttons.map(e => e.pressed).forEach((isPressed, buttonIndex) => {
                if (isPressed) {
                    console.log(`Button ${buttonIndex} is pressed`);

                    let theme = document.querySelector('.-theme').innerText;

                    switch (buttonIndex) {
                        case 0:
                            document.querySelector('.ui-button.middle.big.-yes').click();
                            console.log(`Voted Yes on ${theme}`);   
                            break;
                        case 2:
                            document.querySelector('.ui-button.middle.big.-no').click();
                            console.log(`Voted No on ${theme}`); 
                            break;
                        case 1:
                            document.querySelector('.ui-button.-flag').click();
                            console.log(`Flagged ${theme}`); 
                            break;
                        default:
                            console.log("Mash more buttons...");
                    }
                }
            })
        }
    }, 50)
})();