Launcher/script.js

const {remote} = require('electron');
const {Menu, BrowserWindow, MenuItem, shell} = remote;

const {
    getCurrentWindow,
    minimizeWindow,
    unmaximizeWindow,
    maxUnmaxWindow,
    isWindowMaximized,
    closeWindow,
  } = require("./menubar.js");

window.addEventListener("DOMContentLoaded", () => {
    window.getCurrentWindow = getCurrentWindow;
    window.minimizeWindow = minimizeWindow;
    window.unmaximizeWindow = unmaximizeWindow;
    window.maxUnmaxWindow = maxUnmaxWindow;
    window.isWindowMaximized = isWindowMaximized;
    window.closeWindow = closeWindow;
    const minimizeButton = document.getElementById("minimize-btn");
    const maxUnmaxButton = document.getElementById("max-unmax-btn");
    const closeButton = document.getElementById("close-btn");

    minimizeButton.addEventListener("click", e => {
        window.minimizeWindow();
    });

    maxUnmaxButton.addEventListener("click", e => {
        const icon = maxUnmaxButton.querySelector("#icon-maxUnmax");
    
        window.maxUnmaxWindow();
    
        // Change the middle maximize-unmaximize icons.
        if (window.isWindowMaximized()) {
          icon.classList.remove("icon-square");
          icon.classList.add("icon-clone");
        } else {
          icon.classList.add("icon-square");
          icon.classList.remove("icon-clone");
        }
      });

      closeButton.addEventListener("click", e => {
        window.closeWindow();
      });
});