import type { Header, Options, Transaction } from '../types.js';
export declare const digitsAdjuster: (value: string, length: number) => string;
export declare const cleanNonDigitChars: (value: string) => string;
export declare const addLeadingZeros: (value: number | undefined, length: number) => string;
export declare const numToSignedString: (value: number, length: number) => string;
export declare const headerInfoToHeaderAndFooterStrings: (header: Header, options: Options) => {
    header: string;
    footer: string;
};
export declare function sortTransactions(transactions: Transaction[], options: Options): {
    entryType: import("../types.js").EntryType;
    vatId: string | undefined;
    allocationNumber: string | undefined;
    invoiceDate: string;
    refGroup: string | undefined;
    refNumber: string | undefined;
    invoiceSum: number;
    totalVat?: number | undefined;
}[];
export declare function transactionToString(transaction: Transaction, options: Options): string;