import { Observable } from 'rxjs';
/**
 * Wraps a poller observable with document visibility control.
 * Lets the current cycle finish before pausing; pauses when hidden and resumes when visible.
 *
 * @param poller$ - The polling observable to wrap
 * @param cycler$ - Observable that emits when the current poll cycle completes
 * @param notifier$ - Optional visibility stream; uses document visibility when omitted
 * @returns Observable that emits values from poller$ with visibility-aware pausing
 */
export declare function withHiddenPause$<T>(poller$: Observable<T>, cycler$: Observable<0>, notifier$?: Observable<boolean>): Observable<T>;
/**
 * Returns a shared observable that tracks document visibility (hidden vs visible).
 * Singleton: same observable is reused on subsequent calls.
 *
 * @returns Observable that emits true when document is hidden, false when visible
 */
export declare function getHiddenNotifier$(): Observable<boolean>;
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