/**
 * bankdata-germany
 * Copyright (C) 2022-2024 Markus Baumer <markus@baumer.dev>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.

 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
import { ProbablyString } from "./types";
/**
 * Extract  BLZ from BBAN
 *
 * @param bban German BBAN with 18 digits
 * @returns BLZ or null if invalid
 */
export declare const extractBLZFromBBAN: (bban: ProbablyString) => string | null;