import { BaseCompanyInfo, BaseInvoice } from '../models';
/**
 * Provides functionality for handling the german X-Rechnung format.
 */
export declare abstract class XRechnungUtilities {
    /**
     * Creates and attaches a factur-x xml to the invoice pdf at the given path.
     * @param pdfFilePath - The path of the invoice pdf to attach to.
     * @param invoice - The invoice data to generate the xml from.
     * @param currency - The currency code, eg. 'USD'.
     * @param companyInfo - Info about the seller.
     * @param tradeContact - The trade contact. Defaults to companyInfo.ceo.
     */
    static attachXRechnung<Invoice extends BaseInvoice>(pdfFilePath: string, invoice: Invoice, currency: string, companyInfo: BaseCompanyInfo, tradeContact?: string | undefined): Promise<void>;
    private static createXRechnungBytes;
}