/// Minimal stand-ins for the parts of `provider` that pipe recognises, so the
/// fixture needs no dependency.
library;

class ChangeNotifier {
  void notifyListeners() {}
}

class Consumer<T> {
  const Consumer({required this.builder});

  final Object Function(Object context, T value, Object child) builder;
}

class Selector<T, R> {
  const Selector({required this.selector, required this.builder});

  final R Function(T value) selector;
  final Object Function(Object context, R value, Object child) builder;
}