main.js

const { app, BrowserWindow, dialog } = require('electron');
const { autoUpdater } = require('electron-updater');

autoUpdater.autoDownload = false;

let template = [];
if (process.platform === 'darwin') {
  // OS X
  const name = app.getName();
  template.unshift({
    label: name,
    submenu: [
      {
        label: 'About ' + name,
        role: 'about',
      },
      {
        label: 'Quit',
        accelerator: 'Command+Q',
        click() {
          app.quit();
        },
      },
    ],
  });
}

let win;

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

function createDefaultWindow() {
  win = new BrowserWindow();

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

  win.maximize();
  win.show();
  win.loadURL('http://www.wmsgosoftware.com');

  return win;
}

autoUpdater.on('checking-for-update', () => {
  sendStatusToWindow('Checking for update...');
});

autoUpdater.on('error', (err) => {
  sendStatusToWindow('Error in auto-updater. ' + err);
});

autoUpdater.on('update-available', () => {
  dialog.showMessageBox(
    {
      type: 'info',
      title: 'Found Updates',
      message: 'Found updates, do you want update now?',
      buttons: ['Sure', 'No'],
    },
    (buttonIndex) => {
      if (buttonIndex === 0) {
        autoUpdater.downloadUpdate();
      } else {
      }
    }
  );
});

autoUpdater.on('download-progress', (progressObj) => {
  sendStatusToWindow(progressObj.percent);
});

autoUpdater.on('update-downloaded', () => {
  dialog.showMessageBox(
    {
      title: 'Install Updates',
      message: 'Updates downloaded, application will be quit for update...',
    },
    () => {
      setImmediate(() => autoUpdater.quitAndInstall());
    }
  );
});

app.on('ready', function () {
  createDefaultWindow();
  autoUpdater.checkForUpdatesAndNotify();
});

app.on('window-all-closed', () => {
  app.quit();
});