app.js

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

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 500,
    height: 260,
    minHeight: 220
  })

  // and load the index.html of the app.
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true
  }))

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })

  const template = [
    {
      label: 'Edit',
      submenu: [
        {role: 'undo'},
        {role: 'redo'},
        {type: 'separator'},
        {role: 'cut'},
        {role: 'copy'},
        {role: 'paste'},
        {role: 'pasteandmatchstyle'},
        {role: 'delete'},
        {role: 'selectall'}
      ]
    },
    {
      label: 'View',
      submenu: [
        {role: 'reload'},
        {role: 'forcereload'},
        {role: 'toggledevtools'},
        {type: 'separator'},
        {role: 'resetzoom'},
        {role: 'zoomin'},
        {role: 'zoomout'},
        {type: 'separator'},
        {role: 'togglefullscreen'}
      ]
    },
    {
      role: 'window',
      submenu: [
        {role: 'minimize'},
        {role: 'close'}
      ]
    }
  ]

  if (process.platform === 'darwin') {
    template.unshift({
      label: app.getName(),
      submenu: [
        {role: 'about'},
        {type: 'separator'},
        {role: 'services', submenu: []},
        {type: 'separator'},
        {role: 'hide'},
        {role: 'hideothers'},
        {role: 'unhide'},
        {type: 'separator'},
        {role: 'quit'}
      ]
    })

    // Edit menu
    template[1].submenu.push(
      {type: 'separator'},
      {
        label: 'Speech',
        submenu: [
          {role: 'startspeaking'},
          {role: 'stopspeaking'}
        ]
      }
    )

    // Window menu
    template[3].submenu = [
      {role: 'close'},
      {role: 'minimize'},
      {role: 'zoom'},
      {type: 'separator'},
      {role: 'front'}
    ]
  }

  const menu = Menu.buildFromTemplate(template)
  Menu.setApplicationMenu(menu)
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.