/**
 * Helper utility to prefix object keys for Tailwind config spreading.
 *
 * @param obj - Object with string values (e.g., { md: "36px", lg: "44px" })
 * @param prefix - Prefix to prepend (e.g., "form")
 * @returns Object with prefixed keys (e.g., { "form-md": "36px", "form-lg": "44px" })
 *
 * @example
 * const FORM_HEIGHTS = { md: "36px", lg: "44px" };
 * const prefixed = prefixKeys(FORM_HEIGHTS, "form");
 * // Result: { "form-md": "36px", "form-lg": "44px" }
 */
export declare function prefixKeys<T extends Record<string, string>>(obj: T, prefix: string): Record<string, string>;