import { BaseXMLExtractor } from './base.extractor.js';
/**
 * Associated files extractor for PDF/A-3 documents
 * Extracts XML from associated files (AF entry in the catalog)
 * Particularly useful for ZUGFeRD v1 and some Factur-X documents
 */
export declare class AssociatedFilesExtractor extends BaseXMLExtractor {
    /**
     * Extract XML from a PDF buffer using associated files
     * @param pdfBuffer PDF buffer
     * @returns XML content or null if not found
     */
    extractXml(pdfBuffer: Uint8Array | Buffer): Promise<string | null>;
}