61 lines
2.2 KiB
JavaScript
61 lines
2.2 KiB
JavaScript
|
/** PURE_IMPORTS_START .._Observable,.._util_noop PURE_IMPORTS_END */
|
||
|
|
var __extends = (this && this.__extends) || function (d, b) {
|
||
|
|
for (var p in b)
|
||
|
|
if (b.hasOwnProperty(p))
|
||
|
|
d[p] = b[p];
|
||
|
|
function __() { this.constructor = d; }
|
||
|
|
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
|
||
|
|
};
|
||
|
|
import { Observable } from '../Observable';
|
||
|
|
import { noop } from '../util/noop';
|
||
|
|
/**
|
||
|
|
* We need this JSDoc comment for affecting ESDoc.
|
||
|
|
* @extends {Ignored}
|
||
|
|
* @hide true
|
||
|
|
*/
|
||
|
|
export var NeverObservable = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
|
||
|
|
__extends(NeverObservable, _super);
|
||
|
|
function NeverObservable() {
|
||
|
|
_super.call(this);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Creates an Observable that emits no items to the Observer.
|
||
|
|
*
|
||
|
|
* <span class="informal">An Observable that never emits anything.</span>
|
||
|
|
*
|
||
|
|
* <img src="./img/never.png" width="100%">
|
||
|
|
*
|
||
|
|
* This static operator is useful for creating a simple Observable that emits
|
||
|
|
* neither values nor errors nor the completion notification. It can be used
|
||
|
|
* for testing purposes or for composing with other Observables. Please note
|
||
|
|
* that by never emitting a complete notification, this Observable keeps the
|
||
|
|
* subscription from being disposed automatically. Subscriptions need to be
|
||
|
|
* manually disposed.
|
||
|
|
*
|
||
|
|
* @example <caption>Emit the number 7, then never emit anything else (not even complete).</caption>
|
||
|
|
* function info() {
|
||
|
|
* console.log('Will not be called');
|
||
|
|
* }
|
||
|
|
* var result = Rx.Observable.never().startWith(7);
|
||
|
|
* result.subscribe(x => console.log(x), info, info);
|
||
|
|
*
|
||
|
|
* @see {@link create}
|
||
|
|
* @see {@link empty}
|
||
|
|
* @see {@link of}
|
||
|
|
* @see {@link throw}
|
||
|
|
*
|
||
|
|
* @return {Observable} A "never" Observable: never emits anything.
|
||
|
|
* @static true
|
||
|
|
* @name never
|
||
|
|
* @owner Observable
|
||
|
|
*/
|
||
|
|
NeverObservable.create = function () {
|
||
|
|
return new NeverObservable();
|
||
|
|
};
|
||
|
|
/** @deprecated internal use only */ NeverObservable.prototype._subscribe = function (subscriber) {
|
||
|
|
noop();
|
||
|
|
};
|
||
|
|
return NeverObservable;
|
||
|
|
}(Observable));
|
||
|
|
//# sourceMappingURL=NeverObservable.js.map
|