async_notifier.dart

class PackageMetrics
// AutoDispose/Family版のAsyncNotifier
    extends AutoDisposeFamilyAsyncNotifier<PackageMetricsScore, String> {
  late String _packageName;
  @override
  Future<PackageMetricsScore> build(String arg) {
    _packageName = arg;
    return ref
        .watch(pubRepositoryProvider)
        .getPackageMetrics(packageName: _packageName);
  }

  Future<void> like() async {
    await ref.read(pubRepositoryProvider).like(packageName: _packageName);
    ref.invalidateSelf();
    ref.invalidate(likedPackagesProvider);
  }
}