/**
 * Validates if a string is a valid hex color
 * @param value - The string to validate
 * @returns boolean - true if valid hex color, false otherwise
 */
export declare const isValidHexColor: (value: string) => boolean;
/**
 * Normalizes a hex color string to full 6-digit format with # prefix
 * @param value - The hex color string to normalize
 * @returns string - Normalized hex color or empty string if invalid
 */
export declare const normalizeHexColor: (value: string) => string;
