main.js

'use strict';

// Import parts of electron to use
const {app, BrowserWindow, Menu} = require('electron');
const path = require('path')
const url = require('url')

let mainWindow;
let dev = false;
if (process.defaultApp || /[\\/]electron-prebuilt[\\/]/.test(process.execPath) || /[\\/]electron[\\/]/.test(process.execPath)) {
  dev = true;
}

function createWindow() {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 1024, height: 768, show: false
  });

  // Setup menu, you should change this
  Menu.setApplicationMenu(null);

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

  // Don't show until we are ready and loaded
  mainWindow.once('ready-to-show', () => {
    mainWindow.show();
    // Open the DevTools automatically if developing
    if (dev) {
      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 installExtensions = async () => {
  const installer = require('electron-devtools-installer');
  const forceDownload = !!process.env.UPGRADE_EXTENSIONS;
  const extensions = [
    'REACT_DEVELOPER_TOOLS',
    'REDUX_DEVTOOLS'
  ];

  return Promise
    .all(extensions.map(name => installer.default(installer[name], forceDownload)))
    .catch(console.log);
};

app.on('ready', async () => {
  if (dev) {
    await installExtensions();
  }
  createWindow();
});

// Quit when all windows are closed.
app.on('window-all-closed', () => {
  // On macOS 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 macOS 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();
  }
});