What I did (to present loading state example) is: @freezed abstract class CounterState with _ $ CounterState { const factory CounterState.initial([ @Default ( 0 ) int value]) = _Initial; const factory CounterState.loading( int value) = _Loading; const factory CounterState.current( int value) = _Current; } class CounterStateNotifier extends StateNotifier < CounterState > with LocatorMixin { CounterStateNotifier() : super (CounterState.initial()); void increment() { state = CounterState.loading(state.value); Timer( Duration(seconds: 1 ), () => state = CounterState.current(state.value + 1 ), ); } } StateNotifierBuilder( stateNotifier: context.watch<CounterStateNotifier>(), builder: (context, CounterState state, _) => state. when ( initial: (value) => Text( '$value' , style: Theme. of (context).textTheme.headline4, ), loading: (_) => CircularProgressIndicator(), current: (value) => Text( '$value' , style: Theme. of (context).textTheme.headline4, ), ), ) But that is obviously 'hack'. Any tip? Remi Rousselet / Ryan Edge

How to add something like loading state? I tried: @freezed abstract class CounterState with _ $ CounterState { const factory CounterState.initial([ @Default ( 0 ) int value]) = _Initial; const factory CounterState.loading() = _Loading; const factory CounterState.current( int value) = _Current; } Of course I get an error if I try to use it in notifier, because current looses it: The getter 'value' isn 't defined for the type ' CounterState '. How to go about it? Thanks