Piper State

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Piper StateState management that cleans up after itself.

Plain Dart ViewModels with automatic rebuilds, stream cleanup, and cooperative task cancellation.

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Piper State

Automatic Rebuilds

Watch subscribes to the state it reads. computed() derives values without dependency lists.

Cleanup Follows Ownership

Streams, derived state, and cooperative tasks stop when their ViewModel disposes.

Plain Dart ViewModels

Test business logic without Flutter, generated files, or framework test containers.

Dependencies Stay Visible

Constructor parameters make the dependency graph readable from the code that creates it.

See it in action ​

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

  void increment() => count.update((n) => n + 1);
}
dart
class CounterPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final vm = context.vm<CounterViewModel>();

    return vm.count.build(
      (count) => Text('$count'),
    );
  }
}

Released under the MIT License.

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