import { Temporal } from 'temporal-polyfill';
/**
 * Belgian Social Security Number (Rijksregisternummer) utility
 *
 * Format: YY.MM.DD-XXX.XX or YYMMDDXXXXX
 * - First 6 digits: birthdate (YYMMDD)
 * - Next 3 digits: sequence number (odd for males, even for females)
 * - Last 2 digits: checksum (97 - (first 9 digits mod 97))
 *
 * For people born after 2000, the checksum is calculated with '2' prepended to the 9 digits
 */
export declare class BelgianSsnUtil {
    /**
     * Extracts the birthdate from a Belgian SSN
     * Returns null if the SSN is invalid or birthdate cannot be determined
     */
    static extractBirthdate(ssn: string): Temporal.PlainDate | null;
    /**
     * Checks if the country code indicates Belgium
     */
    static isBelgianCountry(country: string | null | undefined): boolean;
    /**
     * Validates a Belgian SSN format and checksum
     */
    static isValid(ssn: string): boolean;
    /**
     * Removes formatting (dots and dashes) from the SSN
     */
    static normalize(ssn: string): string;
}