export declare function format(kt: string): string;
export declare function makeKerfiskennitala(): string;
export declare function makeKennitala(birthdate?: Date): string;
export declare function clean(kt?: string | number): string;
export declare function isValid(kennitala: string | number): boolean;
export declare function isValidDate(kt: string | number): boolean;
export declare function getBirthdate(kt: string | number): Date;
export declare function isCompany(kt: string): boolean;
export declare function getAge(kt: string | number, referenceDate?: Date): number;
export declare function isKennitalaPart(str?: string): boolean;