import { BaseEncoder } from '../base/base.encoder.js';
import type { TInvoice, TCreditNote, TDebitNote } from '../../interfaces/common.js';
import { UBLDocumentType } from './ubl.types.js';
/**
 * Base encoder for UBL-based invoice formats
 */
export declare abstract class UBLBaseEncoder extends BaseEncoder {
    /**
     * Encodes a TInvoice object into UBL XML
     * @param invoice TInvoice object to encode
     * @returns UBL XML string
     */
    encode(invoice: TInvoice): Promise<string>;
    /**
     * Encodes a TCreditNote object into UBL XML
     * @param creditNote TCreditNote object to encode
     * @returns UBL XML string
     */
    protected abstract encodeCreditNote(creditNote: TCreditNote): Promise<string>;
    /**
     * Encodes a TDebitNote object into UBL XML
     * @param debitNote TDebitNote object to encode
     * @returns UBL XML string
     */
    protected abstract encodeDebitNote(debitNote: TDebitNote): Promise<string>;
    /**
     * Creates the XML declaration and root element
     * @param documentType UBL document type
     * @returns XML string with declaration and root element
     */
    protected createXmlRoot(documentType: UBLDocumentType): string;
    /**
     * Formats a date as an ISO string (YYYY-MM-DD)
     * @param timestamp Timestamp to format
     * @returns Formatted date string
     */
    protected formatDate(timestamp: number): string;
}