Why Angular export empty class in app.modules.ts?

Question

I am new in Angular, I am using Angular 4, and I made an app using the Angular CLI, by ng new command.

In main.ts, we have

 ...
import          


        

Answer 1

The body of the class is indeed empty. But that decorator above the class (@NgModule) is giving that class its functionality. So really, that class isn't empty. It just doesn't require any extra logic after the decorator is applied to it. bootstrapModule takes a class as input and assumes that that class is decorated with @NgModule configured in a manner similar to what you have (declarations, imports, providers, etc.).