Di Module

Using a register module (for third party dependencies) with injectable.
This will

@module  
abstract class AppModule {  
 // You can register named preemptive types like follows  
  @Named("BaseUrl")  
  String get baseUrl => 'My base url';  
  
  // url here will be injected  
  @lazySingleton  
  Dio dio(@Named('BaseUrl') String url) => Dio(BaseOptions(baseUrl: url));  
  
  // same thing works for instances that's gotten asynchronous.  
  // all you need to do is wrap your instance with a future and tell injectable how  
  // to initialize it  
  @preResolve // if you need to pre resolve the value  
  Future<SharedPreferences> get prefs => SharedPreferences.getInstance();  
  // Also, make sure you await for your configure function before running the App.  
}