/**
 * Joins class names together, filtering out falsy values.
 * @param {...(string | boolean | number | null | undefined)} classes - Class names or conditional expressions
 * @returns {string} Combined class names as a single string, or undefined (to prevent class="" not render in node).
 * @example
 * cn('btn', isActive && 'active', hasError && 'error');
 * // Returns: "btn active" (when isActive is true and hasError is false)
 */
export declare const cn: (...classes: (string | boolean | number | null | undefined)[]) => string | undefined;

export { }