// ==UserScript==
// @name         Enable Script on Both Shifts
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Run userscript on both Shift keys pressed
// @author       dsasmblr
// @match        https://*.reddit.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=reddit.com
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function() {
    'use strict';

    window.keys = [];
    let keys = window.keys;

    window.runMyScript = () => {
        console.log('I did it!');
    }

    window.keysCheck = () => {
        keys.push(event.code);
        keys = [...new Set(keys)];
        setTimeout(() => { keys = []; }, 100);
    }

    document.querySelector('body').addEventListener("keydown", (event) => {
        const shiftKeyPressed = event.code === "ShiftLeft" || event.code === "ShiftRight";

        if (shiftKeyPressed) {
            window.keysCheck();
        }

        if (keys.length === 2) {
            window.runMyScript();
            keys = [];
        }
    });
})();