flutter_mux

Flutter widgets for mux. Widgets send typed requests with context.send(...), and each MuxBuilder rebuilds only when the state for its own request changes.

Pre-release (0.1.0-dev.1). The API may change before 0.1.0.

Widgets

• MuxApp: creates the app's single channel once and closes it on dispose.
• MuxBuilder<T>: subscribes to one request key, rebuilds on every state change, and releases the key when disposed.
• context.send(request): sends a request from anywhere below MuxApp.

Usage

MuxBuilder<UserPage>(
  request: FetchUsers(filter),
  builder: (context, state) => switch (state) {
    Idle() || Loading(previous: null) => const CircularProgressIndicator(),
    Loading(:final UserPage previous) => UserList(previous, refreshing: true),
    Data(:final value) => UserList(value),
    Failure(:final error) => Text('Failed: $error'),
  },
)

MuxBuilder only reads state. Send the request yourself, for example from initState or a refresh callback.

To wire services with annotations and skip creating the channel by hand, use mux_generator. See example/main.dart for a complete app that wires one service manually.

Testing

• Create the channel inside the testWidgets body, not in setUp. Widget tests run in a FakeAsync zone, and a channel created outside it never delivers.
• Responses arrive a microtask after they are sent, so call pumpAndSettle() or pump() twice before expecting a rebuild.