How to make the dev tools not show up on screen by default in Electron?

Just comment or remove this line of code in main.js file (setting devTools to false) this.mainWindow.openDevTools();
(or)
Add the following code to

     mainWindow = new BrowserWindow({ 
     width: 1024,
     height: 768,
     webPreferences: {
      devTools: false
      }
   });

(or)
change the package.json build to npm run build && build --win --x64
(or)
again install npm