/**
 * @author  Ikaros Kappler
 * @date    2021-11-07
 * @modified 2023-09-25 Ported to Typescript and added system darkmode detection.
 * @version 1.1.0
 *
 * @param {Record<string,string>} GUP
 * @returns {boolean}
 */
export declare const detectDarkMode: (GUP?: Record<string, string>) => boolean;