chore: Define ReflectionCapabilities interface

modules/angular2/src/reflection/reflection.dart

@@ -5,7 +5,7 @@ import 'types.dart';
 export 'reflector.dart';
 import 'package:angular2/src/facade/lang.dart';
 
-class NoReflectionCapabilities {
+class NoReflectionCapabilities implements IReflectionCapabilities {
   Function factory(Type type) {
     throw "Cannot find reflection information on ${stringify(type)}";
   }

modules/angular2/src/reflection/reflection_capabilities.dart

@@ -4,7 +4,7 @@ import 'package:angular2/src/facade/lang.dart';
 import 'types.dart';
 import 'dart:mirrors';
 
-class ReflectionCapabilities {
+class ReflectionCapabilities implements IReflectionCapabilities {
   ReflectionCapabilities([metadataReader]) {}
 
   Function factory(Type type) {

modules/angular2/src/reflection/reflection_capabilities.ts

@@ -1,8 +1,8 @@
 import {Type, isPresent, global, stringify, BaseException} from 'angular2/src/facade/lang';
 import {List, ListWrapper} from 'angular2/src/facade/collection';
-import {GetterFn, SetterFn, MethodFn} from './types';
+import {GetterFn, SetterFn, MethodFn, IReflectionCapabilities} from './types';
 
-export class ReflectionCapabilities {
+export class ReflectionCapabilities implements IReflectionCapabilities {
   private _reflect: any;
 
   constructor(reflect?: any) { this._reflect = isPresent(reflect) ? reflect : global.Reflect; }
@@ -99,13 +99,15 @@ export class ReflectionCapabilities {
 
   interfaces(type): List<any> { throw new BaseException("JavaScript does not support interfaces"); }
 
-  getter(name: string): GetterFn { return new Function('o', 'return o.' + name + ';'); }
+  getter(name: string): GetterFn { return <GetterFn>new Function('o', 'return o.' + name + ';'); }
 
-  setter(name: string): SetterFn { return new Function('o', 'v', 'return o.' + name + ' = v;'); }
+  setter(name: string): SetterFn {
+    return <SetterFn>new Function('o', 'v', 'return o.' + name + ' = v;');
+  }
 
   method(name: string): MethodFn {
     let functionBody = `if (!o.${name}) throw new Error('"${name}" is undefined');
         return o.${name}.apply(o, args);`;
-    return new Function('o', 'args', functionBody);
+    return <MethodFn>new Function('o', 'args', functionBody);
   }
 }

modules/angular2/src/reflection/reflector.ts

@@ -7,16 +7,17 @@ import {
   StringMap,
   StringMapWrapper
 } from 'angular2/src/facade/collection';
-import {SetterFn, GetterFn, MethodFn} from './types';
+import {SetterFn, GetterFn, MethodFn, IReflectionCapabilities} from './types';
+export {SetterFn, GetterFn, MethodFn, IReflectionCapabilities} from './types';
 
 export class Reflector {
   _typeInfo: Map<Type, any>;
   _getters: Map<string, GetterFn>;
   _setters: Map<string, SetterFn>;
   _methods: Map<string, MethodFn>;
-  reflectionCapabilities: any;
+  reflectionCapabilities: IReflectionCapabilities;
 
-  constructor(reflectionCapabilities) {
+  constructor(reflectionCapabilities: IReflectionCapabilities) {
     this._typeInfo = MapWrapper.create();
     this._getters = MapWrapper.create();
     this._setters = MapWrapper.create();

modules/angular2/src/reflection/types.dart

@@ -3,3 +3,13 @@ library reflection.types;
 typedef SetterFn(Object obj, value);
 typedef GetterFn(Object obj);
 typedef MethodFn(Object obj, List args);
+
+abstract class IReflectionCapabilities {
+  Function factory(Type type);
+  List<List<Type>> parameters(Type type);
+  List<Type> interfaces(Type type);
+  List annotations(Type type);
+  GetterFn getter(String name);
+  SetterFn setter(String name);
+  MethodFn method(String name);
+}

modules/angular2/src/reflection/types.ts

@@ -1,3 +1,21 @@
-export {Function as SetterFn};
-export {Function as GetterFn};
-export {Function as MethodFn};
+import {Type} from 'angular2/src/facade/lang';
+import {List} from 'angular2/src/facade/collection';
+
+// HACK: workaround for Traceur behavior.
+// It expects all transpiled modules to contain this marker.
+// TODO: remove this when we no longer use traceur
+export var __esModule = true;
+
+export type SetterFn = (obj: any, value: any) => void;
+export type GetterFn = (obj: any) => any;
+export type MethodFn = (obj: any, args: List<any>) => any;
+
+export interface IReflectionCapabilities {
+  factory(type: Type): Function;
+  parameters(type: Type): List<List<any>>;
+  interfaces(type: Type): List<any>;
+  annotations(type: Type): List<any>;
+  getter(name: string): GetterFn;
+  setter(name: string): SetterFn;
+  method(name: string): MethodFn;
+}