update

node_modules/rxjs/operator/let.d.ts

@@ -0,0 +1,8 @@
+import { Observable } from '../Observable';
+/**
+ * @param func
+ * @return {Observable<R>}
+ * @method let
+ * @owner Observable
+ */
+export declare function letProto<T, R>(this: Observable<T>, func: (selector: Observable<T>) => Observable<R>): Observable<R>;