fix(typings): the return type of factory of defer should be Observabl…

…eInput<T> (ReactiveX#3211)

src/internal/observable/DeferObservable.ts

@@ -1,4 +1,4 @@
-import { Observable, SubscribableOrPromise } from '../Observable';
+import { Observable, ObservableInput } from '../Observable';
 import { Subscriber } from '../Subscriber';
 import { Subscription } from '../Subscription';
 
@@ -47,7 +47,7 @@ export class DeferObservable<T> extends Observable<T> {
  *
  * @see {@link create}
  *
- * @param {function(): SubscribableOrPromise} observableFactory The Observable
+ * @param {function(): ObservableInput} observableFactory The Observable
  * factory function to invoke for each Observer that subscribes to the output
  * Observable. May also return a Promise, which will be converted on the fly
  * to an Observable.
@@ -57,11 +57,11 @@ export class DeferObservable<T> extends Observable<T> {
  * @name defer
  * @owner Observable
  */
- static create<T>(observableFactory: () => SubscribableOrPromise<T> | void): Observable<T> {
+ static create<T>(observableFactory: () => ObservableInput<T> | void): Observable<T> {
  return new DeferObservable(observableFactory);
  }
 
- constructor(private observableFactory: () => SubscribableOrPromise<T> | void) {
+ constructor(private observableFactory: () => ObservableInput<T> | void) {
  super();
  }
 
@@ -72,7 +72,7 @@ export class DeferObservable<T> extends Observable<T> {
 
 class DeferSubscriber<T> extends OuterSubscriber<T, T> {
  constructor(destination: Subscriber<T>,
- private factory: () => SubscribableOrPromise<T> | void) {
+ private factory: () => ObservableInput<T> | void) {
  super(destination);
  this.tryDefer();
  }