/**
 * Validate if string is hexadecimal
 * @param hex string
 * @returns a boolean stating if the string is a valid hex
 */
export declare function validateHex(hex: string): boolean;
/**
 * Validate if string is rgb
 * @param rgb string
 * @returns a boolean stating if the string is a valid rgb
 */
export declare function validateRGB(rgb: string): boolean;
/**
 * Validate if string is hsl
 * @param hsl string
 * @returns a boolean stating if the string is a valid hsl
 */
export declare function validateHSL(hsl: string): boolean;