From b656f63430ab881fe87eedef7f7dcf19c9cacd9e Mon Sep 17 00:00:00 2001
From: Tim Blasi <tjblasi@google.com>
Date: Mon, 16 Mar 2015 14:43:22 -0700
Subject: [PATCH] feat(di): Add the `@Injectable` annotation

Add an annotation marking a class as available to `Injector`s.
---
 modules/angular2/di.js                 |  2 +-
 modules/angular2/src/di/annotations.js | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/modules/angular2/di.js b/modules/angular2/di.js
index f98c12fc4b..f54eb8cace 100644
--- a/modules/angular2/di.js
+++ b/modules/angular2/di.js
@@ -1,4 +1,4 @@
-export {Inject, InjectPromise, InjectLazy, Optional, DependencyAnnotation} from './src/di/annotations';
+export {Inject, InjectPromise, InjectLazy, Injectable, Optional, DependencyAnnotation} from './src/di/annotations';
 export {Injector} from './src/di/injector';
 export {Binding, Dependency, bind} from './src/di/binding';
 export {Key, KeyRegistry} from './src/di/key';
diff --git a/modules/angular2/src/di/annotations.js b/modules/angular2/src/di/annotations.js
index 425b3991bb..d2197918bd 100644
--- a/modules/angular2/src/di/annotations.js
+++ b/modules/angular2/src/di/annotations.js
@@ -107,4 +107,23 @@ export class DependencyAnnotation {
   @CONST()
   constructor() {
   }
-}
\ No newline at end of file
+}
+
+/**
+ * A class annotation that marks a class as available to `Injector`s for
+ * creation.
+ *
+ * ```
+ * class NeedsService {
+ *   constructor(svc:UsefulService) {}
+ * }
+ *
+ * @Injectable
+ * class UsefulService {}
+ * ```
+ */
+export class Injectable {
+  @CONST()
+  constructor() {
+  }
+}