refactor(di): move Dependency from key.js to binding.js

modules/di/src/binding.js

@@ -1,8 +1,18 @@
-import {Type, bool} from 'facade/lang';
+import {FIELD, Type, bool} from 'facade/lang';
 import {List, MapWrapper, ListWrapper} from 'facade/collection';
 import {reflector} from './reflector';
-import {Key, Dependency} from './key';
+import {Key} from './key';
 
+@FIELD('final key:Key')
+@FIELD('final asFuture:bool')
+@FIELD('final lazy:bool')
+export class Dependency {
+  constructor(key:Key, asFuture:bool, lazy:bool) {
+    this.key = key;
+    this.asFuture = asFuture;
+    this.lazy = lazy;
+  }
+}
 export class Binding {
   constructor(key:Key, factory:Function, dependencies:List, providedAsFuture:bool) {
     this.key = key;

modules/di/src/key.js

@@ -4,18 +4,6 @@ import {FIELD, int, bool} from 'facade/lang';
 var _allKeys = {};
 var _id:int = 0;
 
-//TODO: vsavkin: move to binding once cyclic deps are supported
-@FIELD('final key:Key')
-@FIELD('final asFuture:bool')
-@FIELD('final lazy:bool')
-export class Dependency {
-  constructor(key:Key, asFuture:bool, lazy:bool) {
-    this.key = key;
-    this.asFuture = asFuture;
-    this.lazy = lazy;
-  }
-}
-
 @FIELD('final token')
 @FIELD('final id:int')
 export class Key {

modules/di/src/reflector.dart

@@ -2,7 +2,8 @@ library facade.di.reflector;
 
 import 'dart:mirrors';
 import 'annotations.dart' show Inject, InjectFuture, InjectLazy;
-import 'key.dart' show Key, Dependency;
+import 'key.dart' show Key;
+import 'binding.dart' show Dependency;
 import 'exceptions.dart' show NoAnnotationError;
 
 class Reflector {

modules/di/src/reflector.es6

@@ -1,7 +1,8 @@
 import {Type, isPresent} from 'facade/lang';
 import {List} from 'facade/collection';
 import {Inject, InjectFuture, InjectLazy} from './annotations';
-import {Dependency, Key} from './key';
+import {Key} from './key';
+import {Dependency} from './binding';
 import {NoAnnotationError} from './exceptions';
 
 class Reflector {