google sign-in with angular2 and typescript - where to get gapi?

Question

I\'m trying to use google sign-in with angular2 by following this question: Google Sign-In for Websites and Angular 2 using Typescript

But I\'m getting an error:

Answer 1

I also had same problem in Angular v4.0. Removing async defer from the Google platform API script solved my problem

My Problem was like below when I used Google platform api like :

I solved my problem by discarding async defer from Google platform api script as like below in my index.html :