import { BehaviorSubject, Observable } from 'rxjs';
export declare let asyncBatchesInProgress: number;
export declare const batchInProgress: BehaviorSubject<boolean>;
export declare const batchDone$: Observable<boolean>;
export declare function emitOnce<T>(cb: () => T): T;
export declare function emitOnceAsync<T>(cb: () => Promise<T> | Observable<T>): Promise<T>;