import{Observable}from'../Observable';/** * 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) * ```ts * 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} */exportdeclareconstNEVER:Observable<never>;/** * @deprecated Deprecated in favor of using {@link NEVER} constant. */exportdeclarefunctionnever():Observable<never>;