Add production dependencies

node_modules/rxjs/internal/util/subscribeToObservable.d.ts

@@ -0,0 +1,7 @@
+import { Subscriber } from '../Subscriber';
+/**
+ * Subscribes to an object that implements Symbol.observable with the given
+ * Subscriber.
+ * @param obj An object that implements Symbol.observable
+ */
+export declare const subscribeToObservable: <T>(obj: any) => (subscriber: Subscriber<T>) => any;