Piper State #

Flutter state management with lifecycle-aware ViewModels.

• ✅ Automatic cleanup — streams cancel, tasks abort
• ✅ Explicit dependencies — constructor injection
• ✅ Zero boilerplate — no code generation
• ✅ Testable — plain Dart classes

Installation #

dependencies:
  piper_state: ^0.0.2
  flutter_piper: ^0.0.2  # Flutter widgets

Quick Example #

class CounterViewModel extends ViewModel {
  late final count = state(0);

  void increment() => count.update((c) => c + 1);
}

// In your widget
vm.count.build((count) => Text('$count'));

Stream Binding #

class AuthViewModel extends ViewModel {
  final AuthRepository _auth;

  AuthViewModel(this._auth);

  late final user = bind(_auth.userStream, initial: null);
}

Async Operations #

late final profile = asyncState<Profile>();

void load() => load(profile, () => _repo.fetchProfile());

Why Piper? #

Documentation #

📖 Full docs · GitHub · flutter_piper

License #

MIT