why consoling in server code run electron app

Question

I had used electron to create a desktop app, but I have some problem let me show my code first

my server.js

  'use strict';

   var loopback = require('loopback');
   var boot = require('loopback-boot');
   var path = require('path');
   var bodyParser = require('body-parser');

   var app = module.exports = loopback();

   // configure view handler
   app.set('view engine', 'ejs');
   app.set('views', path.join(__dirname, 'views'));

   app.use(loopback.token());

   console.log("hi")

   app.start = function() {
   // start the web server
         console.log("hi1")
         return app.listen(function() {
             app.emit('started');
             var baseUrl = app.get('url').replace(/\/$/, '');
             console.log('Web server listening at: %s', baseUrl);
             if (app.get('loopback-component-explorer')) {
             var explorerPath = app.get('loopback-component-explorer').mountPath;
            console.log('Browse your REST API at %s%s', baseUrl, explorerPath);
         }
   });
  };

  boot(app, __dirname, function(err) {
    if (err) throw err;

     // start the server if `$ node server.js`
          if (require.main === module)
              console.log("hi2")
              app.start();
  });

here is my index.js of electron

       'use strict';
 const electron = require('electron');             
 const {app, BrowserWindow,crashReporter} = electron;
 require(__dirname+'/server/server.js');

 let mainWindow;

  function onClosed() {
      mainWindow = null;
  }

function createMainWindow() {
    const win = new BrowserWindow({
        width: 600,
        height: 400
    });

    win.loadURL('http://localhost:3000/');
    win.maximize();
    win.on('closed', onClosed);

    return win;
}

  app.on('window-all-closed', () => {
      if (process.platform !== 'darwin') {
          app.quit();
      }
  });

  app.on('activate-with-no-open-windows', () => {
      if (!mainWindow) {
          mainWindow = createMainWindow();
      }
  });

  app.on('ready', () => {
      mainWindow = createMainWindow();
  });

and in my package json(where my application start i mean before electron. package json required to run server) i modify it to run electron app

      {
    "name": "login",
    "version": "0.1.0",
    "productName": "login",
    "main":"index.js",
    "engines": {
      "node": ">=4"
    },
    "electronVersion": "^3.0.2",
    "scripts": {
      "start": "electron .",
      "build": "electron-packager . $npm_package_productName --out=dist --ignore='^/dist$' --prune --asar --all --version=$npm_package_electronVersion",
      "posttest": "npm run lint && nsp check"
    },

    "keywords": [
      "electron-app"
    ],
  "dependencies": {
    // required dependencies to run project
    "electron-debug": "^2.0.0",
  },
  "devDependencies": {
    "electron": "^3.0.2",
    "electron-winstaller": "^2.7.0",     
  },
}

now my problem is that it work correctly if i do console.log("hii") console.log("hi1") and console.log("hi2") in server.js example provide above and if i remove all 3 console.log then electron app does not start app can any body tell me what is this issue