update

node_modules/rxjs/operator/materialize.d.ts

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+import { Observable } from '../Observable';
+import { Notification } from '../Notification';
+/**
+ * Represents all of the notifications from the source Observable as `next`
+ * emissions marked with their original types within {@link Notification}
+ * objects.
+ *
+ * <span class="informal">Wraps `next`, `error` and `complete` emissions in
+ * {@link Notification} objects, emitted as `next` on the output Observable.
+ * </span>
+ *
+ * <img src="./img/materialize.png" width="100%">
+ *
+ * `materialize` returns an Observable that emits a `next` notification for each
+ * `next`, `error`, or `complete` emission of the source Observable. When the
+ * source Observable emits `complete`, the output Observable will emit `next` as
+ * a Notification of type "complete", and then it will emit `complete` as well.
+ * When the source Observable emits `error`, the output will emit `next` as a
+ * Notification of type "error", and then `complete`.
+ *
+ * This operator is useful for producing metadata of the source Observable, to
+ * be consumed as `next` emissions. Use it in conjunction with
+ * {@link dematerialize}.
+ *
+ * @example <caption>Convert a faulty Observable to an Observable of Notifications</caption>
+ * var letters = Rx.Observable.of('a', 'b', 13, 'd');
+ * var upperCase = letters.map(x => x.toUpperCase());
+ * var materialized = upperCase.materialize();
+ * materialized.subscribe(x => console.log(x));
+ *
+ * // Results in the following:
+ * // - Notification {kind: "N", value: "A", error: undefined, hasValue: true}
+ * // - Notification {kind: "N", value: "B", error: undefined, hasValue: true}
+ * // - Notification {kind: "E", value: undefined, error: TypeError:
+ * //   x.toUpperCase is not a function at MapSubscriber.letters.map.x
+ * //   [as project] (http://1…, hasValue: false}
+ *
+ * @see {@link Notification}
+ * @see {@link dematerialize}
+ *
+ * @return {Observable<Notification<T>>} An Observable that emits
+ * {@link Notification} objects that wrap the original emissions from the source
+ * Observable with metadata.
+ * @method materialize
+ * @owner Observable
+ */
+export declare function materialize<T>(this: Observable<T>): Observable<Notification<T>>;