How to fix "Skip checkForUpdatesAndNotify because application is not packed" in electron.js

"electron-builder": "20.28.1"

    const {autoUpdater} = require("electron-updater");
    autoUpdater.checkForUpdatesAndNotify();
    autoUpdater.on('checking-for-update', () => {
      console.log('Checking for update...');
    autoUpdater.on('update-available', (info) => {
      console.log('Update available.');
    autoUpdater.on('update-not-available', (info) => {
      console.log('Update not available.');
    autoUpdater.on('error', (err) => {
      console.log('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 + ')';
      console.log(log_message);
    autoUpdater.on('update-downloaded', (info) => {
      console.log('Update downloaded');
checkForUpdatesAndNotify() just won't work in development mode.
If you insist on test it in dev mode, you can do some hack with isPackaged:
const app = require('electron').app;
Object.defineProperty(app, 'isPackaged', {
  get() {
    return true;
Be careful, do not use this hack for production, it may 
        
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