export interface WatchOptions {
    /** Milliseconds after which a datetime is evicted from the deduplication set inside watchVmDirectory. */
    lockTimeout?: number;
    /** Milliseconds to wait between consecutive size checks when polling for write completion. */
    delayBetweenSizeCheck: number;
    /** When set, backups whose filename-encoded datetime is already past the immutability window are not re-locked. */
    immutabilityDuration?: number;
}
export declare function waitForWriteDone(path: string, timeout: number, delayBetweenSizeCheck: number): Promise<void>;
export declare function watchVmDirectory(vmDir: string, onError: (err: unknown) => void, { lockTimeout, delayBetweenSizeCheck, immutabilityDuration }: WatchOptions): () => void;
export declare function watchRemote(root: string, onError: (err: unknown) => void, options: WatchOptions): Promise<() => void>;