Index: packages/async/lib/src/utils.dart |
diff --git a/packages/async/lib/src/utils.dart b/packages/async/lib/src/utils.dart |
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+// 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 F UnaryFunction<E, F>(E argument); |
+ |
+/// A typedef for a function that takes no arguments and returns a Future or a |
+/// value. |
+typedef FutureOr<T> FutureOrCallback<T>(); |