/**
 * Blob Progress Tracking
 *
 * Uses liveQuery to reactively track unresolved blob refs.
 * Any change to _hasBlobRefs in any syncable table automatically
 * triggers a re-scan — no manual updateBlobProgress() needed.
 */
import { BehaviorSubject, Observable } from 'rxjs';
import { BlobProgress } from '../DexieCloudAPI';
import { DexieCloudDB } from '../db/DexieCloudDB';
/**
 * BehaviorSubject for the isDownloading flag, controlled by eagerBlobDownloader.
 */
export declare function createDownloadingState(): BehaviorSubject<boolean>;
/**
 * Set downloading state.
 */
export declare function setDownloadingState(downloading$: BehaviorSubject<boolean>, isDownloading: boolean): void;
/**
 * Create a liveQuery-based Observable<BlobProgress>.
 *
 * Combines a liveQuery (blobsRemaining, bytesRemaining) with an external
 * isDownloading flag controlled by the eager downloader.
 */
export declare function observeBlobProgress(db: DexieCloudDB, downloading$: BehaviorSubject<boolean>): Observable<BlobProgress>;