State is Object? for Code Generated Notifier

November 16, 2023

I have a Riverpod notifier that has a state object called AuthState. However, when I declare my notifier with the code generation tools it is typing state as object? instead of AuthState. Below is the notifier:

@Riverpod(keepAlive: true)
class AuthService extends _$AuthService {
  late ApiService _apiService;
  late Logger _log;
  final _storage = const FlutterSecureStorage();

  @override
  build() {
    _apiService = ref.watch(apiServiceProvider);
    _log = ref.watch(loggerProvider);
    return AuthState();
  }

  void testFunc() {
    state = state.copyWith(); // doesn't work because state is Object?
  }
}

I can see the culprit is inside my auth_service.g.dart file final authServiceProvider = NotifierProvider<AuthService, Object?>..., but I can’t find any way to change Object? to AuthResult

>Solution :

Declare the return type in your build method so the generator can infer the type:

@override
AuthState build() { ///Here you declare the return type
    _apiService = ref.watch(apiServiceProvider);
    _log = ref.watch(loggerProvider);
    return AuthState();
  }