`emit()` is not a `Future`, and BLoC state must be emitted inside an `on<Event>` handler. ```dart sealed class CounterEvent {} final class CounterIncremented extends CounterEvent {} class CounterBloc extends Bloc<CounterEvent, int> { CounterBloc() : super(0) { on<CounterIncremented>((event, emit) { emit(state + 1); print('done'); }); } void increment() => add(CounterIncremented()); } ``` Remove `.then()`. If the handler performs asynchronous work, use `async`/`await` before calling `emit()`.
Scanned 9/5/2026
Install to Claude Code
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`emit()` is not a `Future`, and BLoC state must be emitted inside an `on<Event>` handler.
```dart
sealed class CounterEvent {}
final class CounterIncremented extends CounterEvent {}
class CounterBloc extends Bloc<CounterEvent, int> {
CounterBloc() : super(0) {
on<CounterIncremented>((event, emit) {
emit(state + 1);
print('done');
});
}
void increment() => add(CounterIncremented());
}
```
Remove `.then()`. If the handler performs asynchronous work, use `async`/`await` before calling `emit()`.
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