VS Code is not showing errors

If I have typed:

  var alien1=new AlieNNConstructor("Venus","1511"); instead of var alien1=new AlienConstructor("Venus","1511");

Why does Visual Studio Code does not give me an error. I have experience with Visual Studio and it gives a messege in the error list whenever the code has minor error like non-existing function. I my case the right function is:

function AlienConstructor (alienPlanet1, alienShip1)
  {
      this.alienPlanet=alienPlanet1;
      this.alienShip=alienShip1;
  }
 var alien1=new AlienConstructor("Venus","1511");

Why does not VS Code give me an error if I have typed non-existing function like this:

function AlienConstructor (alienPlanet1, alienShip1)
  {
      this.alienPlanet=alienPlanet1;
      this.alienShip=alienShip1;
  }
 var alien1=new AlieNNConstructor("Venus","1511");

and AlieNNConstructor(alienPlanet1, alienShip1) does not exist anywhere! Why does not VS Code give an error??? The just stops working and it's quite strange. Can I add something like error box to VS Code that is working right?