Initial implementation of func package. BUG= R=jmesserly@google.com Review URL: https://codereview.appspot.com/250790043.

diff --git a/LICENSE.md b/LICENSE.md
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index 0000000..521fb57
--- /dev/null
+++ b/LICENSE.md

@@ -0,0 +1,28 @@
+
+Copyright 2015, the Dart project authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google Inc. nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

diff --git a/README.md b/README.md
index 8c57b30..61b2637 100644
--- a/README.md
+++ b/README.md

@@ -1,2 +1,4 @@
 # func
-Repository for the func package containing convenience typedefs for specifying function types.
+Repository for the func package containing convenience typedefs defining
+commonly used function types to make it simpler to define members that return
+specific function types.

diff --git a/lib/func.dart b/lib/func.dart
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index 0000000..041bb49
--- /dev/null
+++ b/lib/func.dart

@@ -0,0 +1,29 @@
+// Copyright (c) 2015, 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.
+
+/// Typedefs defining commonly used function types to make it simpler to
+/// define members that return specific function types.
+library func;
+
+typedef R Func0<R>();
+typedef R Func1<A, R>(A a);
+typedef R Func2<A, B, R>(A a, B b);
+typedef R Func3<A, B, C, R>(A a, B b, C c);
+typedef R Func4<A, B, C, D, R>(A a, B b, C c, D d);
+
+typedef R Func1Opt1<A, R>([A a]);
+typedef R Func2Opt1<A, B, R>(A a, [B b]);
+typedef R Func3Opt1<A, B, C, R>(A a, B b, [C c]);
+typedef R Func4Opt1<A, B, C, D, R>(A a, B b, C c, [D d]);
+
+typedef void VoidFunc0();
+typedef void VoidFunc1<A>(A a);
+typedef void VoidFunc2<A, B>(A a, B b);
+typedef void VoidFunc3<A, B, C>(A a, B b, C c);
+typedef void VoidFunc4<A, B, C, D>(A a, B b, C c, D d);
+
+typedef void VoidFunc1Opt1<A>([A a]);
+typedef void VoidFunc2Opt1<A, B>(A a, [B b]);
+typedef void VoidFunc3Opt1<A, B, C>(A a, B b, [C c]);
+typedef void VoidFunc4Opt1<A, B, C, D>(A a, B b, C c, [D d]);

diff --git a/pubspec.yaml b/pubspec.yaml
new file mode 100644
index 0000000..81264e1
--- /dev/null
+++ b/pubspec.yaml

@@ -0,0 +1,9 @@
+name: func
+version: 0.1.0
+description: >
+  Typedefs defining commonly used function types to make it simpler to
+  define members that return specific function types.
+author: Dart Dev Compiler team <dev-compiler@dartlang.org>
+homepage: https://github.com/dart-lang/func
+environment:
+  sdk: ">=1.9.0 <2.0.0"