Future<T> localOrBackendOrExternal<T>({
  required Future<void> Function(T e) storeLocally,
  required Future<T?> Function() localGet,
  required Future<T> Function() backendGet,
  required Future<T> Function() externalGet,
}) async {
  final local = await localGet();
  if (local != null) return local;
  try {
    final backend = await backendGet();
    storeLocally(backend);
    return backend;
  } catch (error, stackTrace) {
    Future(() => Error.throwWithStackTrace(error, stackTrace));
  }
  final external = await externalGet();
  storeLocally(external);
  return external;
}