index.js

const path = require('path')
const { app, BrowserWindow, Menu } = require('electron')
const pkg = require('./package')

try {
  require('electron-reloader')(module)
} catch (err) {}

// 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 win

function createWindow() {
  app.dock.setIcon(`${__dirname}/src/static/dock-icon.png`)

  win = new BrowserWindow({
    webPreferences: {
      nodeIntegration: true
    },
    width: 1200,
    height: 800,
    minHeight: 340,
    minWidth: 680
  })

  // and load the index.html of the app.
  win.loadURL(path.join(`file://${__dirname}`, `${pkg['main-html']}`))

  win.on('closed', () => {
    // 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.
    win = null
  })

  if (process.env.NODE_ENV === 'development') {
    const {
      default: installExtension,
      REACT_DEVELOPER_TOOLS,
      REDUX_DEVTOOLS
    } = require('electron-devtools-installer')

    installExtension([REACT_DEVELOPER_TOOLS, REDUX_DEVTOOLS])
      .then(name => console.log(`Added Extension:  ${name}`))
      .catch(err => console.log('An error occurred: ', err))

    win.webContents.openDevTools()
  }

  const template = [
    {
      label: 'Application',
      submenu: [
        {
          label: 'About Application',
          selector: 'orderFrontStandardAboutPanel:'
        },
        { type: 'separator' },
        {
          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))
}

// 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', () => {
  // 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', () => {
  // 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 (win === null) {
    createWindow()
  }
})