48 lines
2.1 KiB
TypeScript
48 lines
2.1 KiB
TypeScript
|
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>>;
|