fix(typings): don't expose PromiseConstructor dependency

closes #1270

Author: alexeagle

src/CoreOperators.ts

@@ -84,7 +84,7 @@ export interface CoreOperators<T> {
   timeout?: (due: number | Date, errorToSend?: any, scheduler?: Scheduler) => Observable<T>;
   timeoutWith?: <R>(due: number | Date, withObservable: Observable<R>, scheduler?: Scheduler) => Observable<T> | Observable<R>;
   toArray?: () => Observable<T[]>;
-  toPromise?: (PromiseCtor: PromiseConstructor) => Promise<T>;
+  toPromise?: (PromiseCtor: typeof Promise) => Promise<T>;
   window?: (closingNotifier: Observable<any>) => Observable<Observable<T>>;
   windowCount?: (windowSize: number, startWindowEvery: number) => Observable<Observable<T>>;
   windowTime?: (windowTimeSpan: number, windowCreationInterval?: number, scheduler?: Scheduler) => Observable<Observable<T>>;

src/Observable.ts

@@ -129,7 +129,7 @@ export class Observable<T> implements CoreOperators<T>  {
    * @returns {Promise} a promise that either resolves on observable completion or
    *  rejects with the handled error
    */
-  forEach(next: (value: T) => void, thisArg: any, PromiseCtor?: PromiseConstructor): Promise<void> {
+  forEach(next: (value: T) => void, thisArg: any, PromiseCtor?: typeof Promise): Promise<void> {
     if (!PromiseCtor) {
       if (root.Rx && root.Rx.config && root.Rx.config.Promise) {
         PromiseCtor = root.Rx.config.Promise;
@@ -269,7 +269,7 @@ export class Observable<T> implements CoreOperators<T>  {
   timeout: (due: number | Date, errorToSend?: any, scheduler?: Scheduler) => Observable<T>;
   timeoutWith: <R>(due: number | Date, withObservable: Observable<R>, scheduler?: Scheduler) => Observable<T> | Observable<R>;
   toArray: () => Observable<T[]>;
-  toPromise: (PromiseCtor?: PromiseConstructor) => Promise<T>;
+  toPromise: (PromiseCtor?: typeof Promise) => Promise<T>;
   window: (closingNotifier: Observable<any>) => Observable<Observable<T>>;
   windowCount: (windowSize: number, startWindowEvery: number) => Observable<Observable<T>>;
   windowTime: (windowTimeSpan: number, windowCreationInterval?: number, scheduler?: Scheduler) => Observable<Observable<T>>;

src/operator/toPromise.ts

@@ -1,6 +1,6 @@
 import {root} from '../util/root';
 
-export function toPromise<T>(PromiseCtor?: PromiseConstructor): Promise<T> {
+export function toPromise<T>(PromiseCtor?: typeof Promise): Promise<T> {
   if (!PromiseCtor) {
     if (root.Rx && root.Rx.config && root.Rx.config.Promise) {
       PromiseCtor = root.Rx.config.Promise;