Tweetdeck like shortcut for Mastodon

TootDeckShortcutAlternative.js

// ==UserScript==
// @name         TootDeck Shortcut Alternative
// @namespace    k0ta0uchi
// @version      0.1
// @description  Add shortcut keys like TweetDeck to Mastodon
// @author       k0ta0uchi
// @match        https://*/web/*
// @downloadURL  https://gist.githubusercontent.com/k0ta0uchi/03f5ca5a3d2eae8fac03f6f61a56e400/raw/3fa111403799376bf5b7dcb0d222cc2c8862270c/TootDeckShortcutAlternative.js
// @grant        none
// ==/UserScript==

(() => {
    'use strict';
    const KEY_N = 78,
          KEY_S = 83,
          doc = document;
    doc.onkeyup = (e) => {
        let activeTag = document.activeElement.tagName;
        if (activeTag != "INPUT" && activeTag != "TEXTAREA") {
            switch (e.keyCode) {

                case KEY_N:
                    // Key: n - prepare to post New toot
                    doc.querySelector(".autosuggest-textarea__textarea").focus();
                    doc.querySelector(".autosuggest-textarea__textarea").value="";
                    break;

                case KEY_S:
                    // key: s - prepare to Search
                    doc.querySelector(".search__input").focus();
                    doc.querySelector(".search__input").value="";
                    break;
            }
        }
    };
})();