/**
 * Validates a PESEL (Polish national identification number) string.
 * This function validates the control number and ensures the birthdate is also valid.
 *
 * **Note:** This validator isn't perfect. Some invalid numbers might still return true.
 * For example, people born before the year 1931 might accidentally swap their birthyear
 * and birthday, and the function will still pass. 1st, 5th, and 9th or 2nd, 6th, and
 * 10th numbers may also be swapped while still passing. There is nothing that can really
 * be done about that, other than validating against a database of PESEL numbers.
 *
 * @param {string} pesel - The 11-digit PESEL number as a string.
 * @returns {boolean} `true` if the PESEL is valid; `false` otherwise.
 */
export declare function isPeselValid(pesel: string): boolean;
/**
 * Validates a PESEL (Polish national identification number) string.
 * This function validates the control number and ensures the birthdate is also valid.
 *
 * **Note:** This validator isn't perfect. Some invalid numbers might still return true.
 * For example, people born before the year 1931 might accidentally swap their birthyear
 * and birthday, and the function will still pass. 1st, 5th, and 9th or 2nd, 6th, and
 * 10th numbers may also be swapped while still passing. There is nothing that can really
 * be done about that, other than validating against a database of PESEL numbers.
 *
 * @param {string} pesel - The 11-digit PESEL number as a string.
 * @returns {boolean} `true` if the PESEL is invalid; `false` otherwise.
 */
export declare const isPeselInvalid: (pesel: string) => boolean;
/**
 * Extracts the birthdate from a valid PESEL number.
 * @param pesel - The 11-digit PESEL number as a string.
 * @returns The birthdate as a Date object.
 * @throws Error if the PESEL is invalid.
 */
export declare function getBirthdateFromPesel(pesel: string): Date;
export declare const PeselSex: {
    readonly Male: "male";
    readonly Female: "female";
};
export type PeselSex = (typeof PeselSex)[keyof typeof PeselSex];
/**
 * Extracts the sex from a valid PESEL number.
 * @param pesel - The 11-digit PESEL number as a string.
 * @returns 'male' if the PESEL belongs to a male, 'female' if it belongs to a female.
 * @throws Error if the PESEL is invalid.
 */
export declare function extractSexFromPesel(pesel: string): PeselSex;