/**
 * Utility function to combine class names with deduplication
 * @param {...Array<string | number | boolean | null | undefined>} classes - Classes to combine
 * @returns {string} A combined, deduplicated string of class names
 *
 * @example
 * clsx('btn', conditional && 'btn-primary', 'btn') // 'btn btn-primary'
 */
export declare function clsx(...classes: Array<string | number | boolean | null | undefined>): string;