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import { Observable } from '../Observable';
import { noop } from '../util/noop';
/**
* An Observable that emits no items to the Observer and never completes.
*
* 
*
* 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
* ### Emit the number 7, then never emit anything else (not even complete)
* ```javascript
* import { NEVER } from 'rxjs';
* import { startWith } from 'rxjs/operators';
*
* function info() {
* console.log('Will not be called');
* }
* const result = NEVER.pipe(startWith(7));
* result.subscribe(x => console.log(x), info, info);
*
* ```
*
* @see {@link Observable}
* @see {@link index/EMPTY}
* @see {@link of}
* @see {@link throwError}
*/
export const NEVER = new Observable<never>(noop);
/**
* @deprecated Deprecated in favor of using {@link NEVER} constant.
*/
export function never () {
return NEVER;
}
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