main.js

// Modules to control application life and create native browser window
const {app, BrowserWindow} = require('electron')
const url = require('url')
const path = require('path')

// 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({
    show: false,
    width: 600,
    height: 350,
    resizable: false,
    maximizable: false,
    titleBarStyle: 'hiddenInset',
    transparent: true,
    webPreferences: {webSecurity: false},
  })

  mainWindow.once('ready-to-show', () => {
    mainWindow.show()
  })

  // and load the index.html of the app.
  // /work/git/square/web
  // mainWindow.loadURL('http://localhost:8888/');
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, './build/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
  })
}

// 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.