/**
 * Domain Utils.
 *
 * @export
 * @abstract
 * @class DomainUtils
 */
export declare abstract class DomainUtils {
    /**
     * Check if an URL part is a valid TLD (top level domain).
     *
     * @static
     * @param {string} part URL part.
     * @returns {boolean} True if TLD.
     * @memberof DomainUtils
     */
    static isTLD(part: string): boolean;
    private static oTLDs;
    private static gTLDs;
    private static ccTLDs;
}