import { InjectDocumentVisibilityOptions } from 'ngxtension/inject-document-visibility';
import { MonoTypeOperatorFunction } from 'rxjs';
/**
 * RxJS operator to pause a stream when the document is hidden (i.e.: tab is not active)
 * and to resume the stream when the document is visible (i.e.: tab is active).
 *
 * @example This example shows how to do an HTTP GET every 5 seconds only when the page is visible in the browser:
 * ```typescript
 * http.get('http://api').pipe(poll(5000), whenPageVisible()).subscribe(result => {})
 * ```
 * @public
 */
export declare function whenDocumentVisible<T>(options?: InjectDocumentVisibilityOptions): MonoTypeOperatorFunction<T>;