Browser UserScript to show Project Star count for each LGTM result

lgtm.js

// ==UserScript==
// @name         LGTM stars
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Show star counts
// @author       Alvaro Muñoz (@pwntester)
// @match        https://lgtm.com/query/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function () {
    'use strict';

    const callback = function(mutationsList, observer) {
        for(const mutation of mutationsList) {
            if (mutation.type === 'childList') {
                const addedNode = mutation.addedNodes[0]
                if (addedNode != undefined && addedNode.classList != undefined) {
                    if (addedNode.classList.contains('c-query-run-display')) {
                        const projectNode = addedNode.getElementsByClassName("project-name")[0]
                        if (projectNode != undefined) {
                            const name = projectNode.textContent;
                            fetch('https://api.github.com/repos/'+name)
                                .then(response => response.json())
                                .then(data => {


                                // show watchers count
                                projectNode.textContent=name + " ✨"+data.watchers_count+"✨";

                                // collapse element
                                const header = addedNode.getElementsByClassName("header")[0]
                                console.log(name, data.watchers_count, header);
                                header.dispatchEvent(new MouseEvent("click", {"view": window, "bubbles": true, "cancelable": false}));
                            })
                        }
                    }
                }
            }
        }
    };

    var observer = new MutationObserver(callback);
    observer.observe(document, {
        childList: true,
        subtree: true
    });
})();