Providers

A component can configure dependency injection by defining the list of providers the component and its children may inject.

@Component({
  selector: 'conf-app',
  providers: [Logger]
})
class AppCmp { //... }

@Component({
  ...
})
class TalksCmp {
  constructor(logger:Logger) { //... }
}

In this example, we have the logger service declared in the app component, which makes them available in the whole application. The talks component injects the logger service. I will cover dependency injection in detail in Chapter 5, Dependency Injection. For now, just remember that components can configure dependency injection.