import { ValidatorFn } from '@angular/forms';
/**
 * Custom iban validator for angular forms.
 * Checks if the iban is valid.
 * First move the first four chracters from the beginngin to the end of the string.
 * Change the letter to a numeric representation.
 * Calculate the modulo in a parts, because javascript cannot accuratly calculate the modulus for large numbers.
 *
 * @returns Null if the iban is valid or the value is an empty string, else return an object with isIbanValid property.
 */
export declare function ibanValidator(): ValidatorFn;
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