bloc-state-management

To manage Flutter feature state, use Cubit as the default state machine and define sealed Freezed states to represent idle, loading, success, and error phases for predictable UI reactions. This approach keeps application logic entirely out of your widgets.

Use Bloc instead of Cubit for Flutter state management when your feature requires complex event streams, throttling, or detailed event traceability. Cubit serves as the first-choice default for most slices, keeping orchestration simpler until advanced stream control is needed.

Handle async use cases in Flutter BLoC by wiring use cases that return Either types to your Cubit or Bloc, emitting loading states during execution, then updating the UI on success or surfacing typed failure errors on the error state.

The best way to test Flutter Cubit state transitions is using bloc_test to verify that your sealed Freezed state contracts hold during loading, success, and error transitions. This ensures your state machine maps cleanly to expected async use case outputs.

Yes, clean architecture in Flutter requires Either-returning use cases to explicitly model typed failures. This allows your Cubit or Bloc to branch state emissions predictably between success and typed error states during async orchestration.