build(typescript): Migrated change detection to typescript

modules/angular2/src/facade/async.ts

@@ -52,7 +52,7 @@ export class PromiseWrapper {
 
 
 export class ObservableWrapper {
-  static subscribe(emitter: EventEmitter, onNext, onThrow = null, onReturn = null) {
+  static subscribe(emitter: Observable, onNext, onThrow = null, onReturn = null): Object {
     return emitter.observer({next: onNext, throw: onThrow, return: onReturn});
   }
 
@@ -69,7 +69,7 @@ export class ObservableWrapper {
 
 // TODO: vsavkin change to interface
 export class Observable {
-  observer(generator: any) {}
+  observer(generator: any): Object { return null; }
 }
 
 /**

modules/angular2/src/facade/collection.ts

@@ -117,9 +117,9 @@ export class ListWrapper {
   static indexOf(array: List<any>, value, startIndex = -1) {
     return array.indexOf(value, startIndex);
   }
-  static reduce<T>(list: List<T>,
-                   fn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T,
-                   init: T) {
+  static reduce<T, E>(list: List<T>,
+                      fn: (accumValue: E, currentValue: T, currentIndex: number, array: T[]) => E,
+                      init: E) {
     return list.reduce(fn, init);
   }
   static filter(array, pred: Function) { return array.filter(pred); }