File 'app/hero.ts' is not a module error in the console, where to store interfaces files in directory structure with angular2?

Question

I am doing the angular2 tutorial at this address: https://angular.io/docs/ts/latest/tutorial/toh-pt3.html I have put the hero interface in a single

Answer 1

I got the same error in the same tutorial because I had forgot the export keyword for the interface.