main.js

const {
  app,
  BrowserWindow,
  Menu,
} = require('electron');
const { autoUpdater } = require('electron-updater');
const log = require('electron-log');
// const {
//   default: installExtension,
//   REACT_DEVELOPER_TOOLS,
//   REDUX_DEVTOOLS,
// } = require('electron-devtools-installer');

autoUpdater.logger = log;
autoUpdater.logger.transports.file.level = 'info';
log.info('App starting...');

let win;

function createWindow() {
  // Create the browser window.
  win = new BrowserWindow({
    width: 1200,
    height: 800,
    minWidth: 1080,
    minHeight: 760,
  });

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

  // and load the index.html of the app.
  win.loadFile('./index.html');

  // Open the DevTools.
  win.webContents.openDevTools();

  // Emitted when the window is closed.
  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;
  });

  const template = [
    {
      label: 'Application',
      submenu: [
        { label: 'About Application', selector: 'orderFrontStandardAboutPanel:' },
        { type: 'separator' },
        { label: 'Quit', accelerator: 'Command+Q', click: () => 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));
}

function sendStatusToWindow(text) {
  log.info(text);
  win.webContents.send('message', text);
}

autoUpdater.on('checking-for-update', () => {
  sendStatusToWindow('Checking for update...');
})
autoUpdater.on('update-available', (info) => {
  sendStatusToWindow('Update available.');
})
autoUpdater.on('update-not-available', (info) => {
  sendStatusToWindow('Update not available.');
})
autoUpdater.on('error', (err) => {
  sendStatusToWindow('Error in auto-updater. ' + err);
})
autoUpdater.on('download-progress', (progressObj) => {
  let log_message = "Download speed: " + progressObj.bytesPerSecond;
  log_message = log_message + ' - Downloaded ' + progressObj.percent + '%';
  log_message = log_message + ' (' + progressObj.transferred + "/" + progressObj.total + ')';
  sendStatusToWindow(log_message);
})
autoUpdater.on('update-downloaded', (info) => {
  sendStatusToWindow('Update downloaded');
});

// 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 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 (win === 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.