main.js

const { app, Menu, BrowserWindow } = require('electron');
const path = require('path');
const url = require('url');

let mainWindow;

function createWindow () {
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    acceptFirstMouse: true,
    titleBarStyle: 'hidden',
    frame: false,
  });

  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true,
  }));

  // Open the DevTools.
  if (process.env.NODE_ENV === 'development') {
    mainWindow.webContents.openDevTools()
  }

  mainWindow.on('closed', function () {
    mainWindow = null;
  });

  var template = [{
    label: "Application",
    submenu: [
      { label: "Quit", accelerator: "Command+Q", click: function() { app.quit(); }}
    ]
  }, {
    label: "Edit",
    submenu: [
      { label: "Undo", accelerator: "CmdOrCtrl+Z", selector: "undo:" },
      { label: "Redo", accelerator: "Shift+CmdOrCtrl+Z", selector: "redo:" },
      { type: "separator" },
      { label: "Cut", accelerator: "CmdOrCtrl+X", selector: "cut:" },
      { label: "Copy", accelerator: "CmdOrCtrl+C", selector: "copy:" },
      { label: "Paste", accelerator: "CmdOrCtrl+V", selector: "paste:" },
      { label: "Select All", accelerator: "CmdOrCtrl+A", selector: "selectAll:" }
    ]}
  ];

  Menu.setApplicationMenu(Menu.buildFromTemplate(template));
}

if (process.env.NODE_ENV === 'development') {
  require('electron-reload')(__dirname);
}

app.on('ready', createWindow);

app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', function () {
  if (mainWindow === null) {
    createWindow();
  }
});