| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'dart:async'; |
| |
| /// A generic typedef for a function that takes one type and returns another. |
| typedef UnaryFunction<E, F> = F Function(E argument); |
| |
| /// A typedef for a function that takes no arguments and returns a Future or a |
| /// value. |
| typedef FutureOrCallback<T> = FutureOr<T> Function(); |
