Начало наработок

node_modules/rxjs/operator/isEmpty.d.ts

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+import { Observable } from '../Observable';
+/**
+ * If the source Observable is empty it returns an Observable that emits true, otherwise it emits false.
+ *
+ * <img src="./img/isEmpty.png" width="100%">
+ *
+ * @return {Observable} An Observable that emits a Boolean.
+ * @method isEmpty
+ * @owner Observable
+ */
+export declare function isEmpty<T>(this: Observable<T>): Observable<boolean>;