/**
 * ibantools-germany
 * Copyright (c) 2022-2026 Markus Baumer <markus@baumer.dev>
 * SPDX-License-Identifier: MIT OR MPL-2.0
 */
export interface CheckDigits {
    [method: string]: number[];
}
export interface NextCheckDigits {
    add: CheckDigits;
    remove: CheckDigits;
    valid: string;
}
/**
 * Returns date object
 *
 * @param date Date from string or current date if undefined
 * @returns
 */
export declare const dateObject: (date?: string | Date) => Date;
/**
 * Combines current data by adding or removing from data provided in next
 * @param current
 * @param nextAdd
 * @param nextRemove
 */
export declare const combineCurrentNext: (current: CheckDigits, nextAdd: CheckDigits, nextRemove: CheckDigits) => CheckDigits;
/**
 * Get data, either current or combined with next by comparing it to valid-to
 * date from next data
 * @param date
 * @returns
 */
export declare const checkDigitData: (date?: string | Date) => CheckDigits;
/**
 * Get the check digit method assigned for a BLZ
 *
 * @param blz German BLZ with 8 digits
 * @param date Method valid at this date (default: current date)
 * @returns Check digit method or null if invalid
 */
export declare const methodForBLZ: (blz: string, date?: string | Date) => string | null;