main.dart

import "package:riverpod/riverpod.dart";

void main() {
  // A `ProviderContainer` is the central storage for the state of all providers.
  final container = ProviderContainer();

  // A `StateProvider` is used to expose a simple, mutable piece of state.
  // In this case, 'counter' holds an integer value, initialized to 0.
  final counter = StateProvider((ref) => 0);

  // `container.listen` allows you to observe changes in a provider's state.
  container.listen(counter, (prevCount, currentCount) {
    print(currentCount);
  });

  // Setting `state = 1` will trigger the `container.listen` callback.
  // Logs: 1
  container.read(counter.notifier).state = 1;
}