Freezed when method isn't recognized — help needed

[Mohamad-Ammis]

Hey folks 👋
I'm trying to use freezed for the first time to handle my Cubit states, but I can't access the generated methods like when, maybeWhen, etc. The error I get is:

---

✅ What I did

📄 My AuthState class

part of 'auth_cubit.dart';

@freezed
class AuthState with _$AuthState {
  const factory AuthState.initial() = _Initial;
  const factory AuthState.registerLoading() = _RegisterLoading;
  const factory AuthState.registerFailure({required String errMessage}) = _RegisterFailure;
  const factory AuthState.registerSuccess() = _RegisterSuccess;
}

📄 My `AuthCubit class

import 'dart:developer';
import 'package:delta_app/core/bloc/base_cubit.dart';
import 'package:delta_app/core/utils/service_locator.dart';
import 'package:delta_app/feature/auth/data/models/register_input_model.dart';
import 'package:delta_app/feature/auth/data/repos/auth_repository.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'auth_state.dart';
part 'auth_cubit.freezed.dart';

class AuthCubit extends BaseCubit<AuthState> {
  AuthCubit() : super(AuthState.initial());

  final AuthRepository authRepository = getIt.get<AuthRepository>();

  Future<bool> register({required RegisterInputModel model}) async {
    try {
      bool result = false;
      safeEmit(AuthState.registerLoading());

      final data = await authRepository.register(model: model);

      data.fold(
        (failure) => safeEmit(AuthState.registerFailure(errMessage: failure.errorMessage)),
        (success) {
          safeEmit(AuthState.registerSuccess());
          result = true;
        },
      );

      return result;
    } catch (e) {
      log('e: $e');
      safeEmit(AuthState.registerFailure(errMessage: e.toString()));
      return false;
    }
  }
}

😢 where i try to use when

BlocBuilder<AuthCubit, AuthState>(
  builder: (context, state) {
    return CustomButton(
      onTap: () {
        if (_key.currentState!.validate()) {
          log('validate');
        } else {
          setState(() {
            _autoValidateMode = AutovalidateMode.onUserInteraction;
            _key.currentState!.save();
          });
        }
      },
      gradient: kCommonGradinet,
      child: Text(
        "إنشاء حساب",
        style: Styles.style15Bold.copyWith(color: Colors.white),
      ),
    );
  },
);

what i've tried

remove all dependencies and add them again

delete pubspec.lock and run flutter clean ,flutter pub get then run build runner again

Ran flutter pub run build_runner build --delete-conflicting-outputs

add this to analysis_options.yaml

analyzer:
  errors:
    invalid_annotation_target: ignore

Tried hot restart and full rebuild

[yusuff122]

What to Check

1. Was auth_cubit.freezed.dart generated?
   Check that this file exists in your project:

Does auth_cubit.freezed.dart exist?

Does it include generated classes like _Initial, _RegisterLoading, _RegisterFailure, _RegisterSuccess?

flutter pub run build_runner build --delete-conflicting-outputs

2. Are you actually calling state.when(...) in your UI?
   In your BlocBuilder, you're not using any of the generated methods yet. For example, this:
   state.when( initial: () => ..., registerLoading: () => ..., registerFailure: (errMessage) => ..., registerSuccess: () => ..., )

[Mohamad-Ammis]

Yes, the auth_cubit.freezed.dart file is generated correctly and exists in the project. However, the when, map, and similar pattern-matching functions are not available. From what I’ve read in the migration guide, it seems that Freezed v3 no longer automatically generates these methods

So to clarify:

File is generated.

when, map, etc. are not available.

According to the Freezed v3 migration guide, this change is expected behavior unless union types are explicitly defined.