import { AbstractPowerSyncDatabase } from '../client/AbstractPowerSyncDatabase.js';
import { DifferentialWatchedQuery } from '../client/watched/processors/DifferentialQueryProcessor.js';
import { ILogger } from '../utils/Logger.js';
import { AttachmentContext } from './AttachmentContext.js';
import { AttachmentRecord } from './Schema.js';
/**
 * Service for querying and watching attachment records in the database.
 *
 * @internal
 */
export declare class AttachmentService {
    private db;
    private logger;
    private tableName;
    private mutex;
    private context;
    constructor(db: AbstractPowerSyncDatabase, logger: ILogger, tableName?: string, archivedCacheLimit?: number);
    /**
     * Creates a differential watch query for active attachments requiring synchronization.
     * @returns Watch query that emits changes for queued uploads, downloads, and deletes
     */
    watchActiveAttachments({ throttleMs }?: {
        throttleMs?: number;
    }): DifferentialWatchedQuery<AttachmentRecord>;
    /**
     * Executes a callback with exclusive access to the attachment context.
     */
    withContext<T>(callback: (context: AttachmentContext) => Promise<T>): Promise<T>;
}