interface InjectionType<T> {
  identity: InjectionSelector<T>
  useValue?: any
  useClass?: InjectionClass<any>
}

Represents data passed to the injector.

• identity: (required) A reference key (a class, a language symbol, or an InjectionToken).
• useClass: The class which will be instenciated by the injector.
• useValue: A data which will be provided without instenciation.