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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) * * ```ts * import { NEVER, startWith } from 'rxjs'; * * const info = () => console.log('Will not be called'); * * const result = NEVER.pipe(startWith(7)); * result.subscribe({ * next: x => console.log(x), * error: info, * complete: info * }); * ``` * * @see {@link Observable} * @see {@link EMPTY} * @see {@link of} * @see {@link throwError} */ export const NEVER = new Observable<never>(noop); /** * @deprecated Replaced with the {@link NEVER} constant. Will be removed in v8. */ export function never() { return NEVER; }
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