/**
 * 判断是否 十六进制颜色值.
 * 输入形式可为 #fff000 #f00
 *
 * @param   String  color   十六进制颜色值
 * @return  Boolean
 */
export declare function isHexColor(color: string): boolean;
/**
 * RGB 颜色值转换为 十六进制颜色值.
 * r, g, 和 b 需要在 [0, 255] 范围内
 *
 * @return  String          类似#ff00ff
 * @param r
 * @param g
 * @param b
 */
export declare function rgbToHex(r: number | string, g?: number, b?: number): string;
/**
 * Transform a HEX color to its RGB representation
 * @param {string} hex The color to transform
 * @returns The RGB representation of the passed color
 */
export declare function hexToRGB(hex: string): string;
/**
 * 调整颜色的亮度和饱和度
 * @param {string} color 颜色值，支持hex(#ffffff)、rgb(255,255,255)、rgba(255,255,255,0.5)格式
 * @param {number} brightness 亮度调整值，范围-100到+100，正值变亮，负值变暗，0保持不变
 * @param {number} saturation 饱和度调整值，范围-100到+100，可选，不传则保持原饱和度
 * @returns {string} 调整后的HSL色值，格式为 "hsl(212, 57.8%, 40%)"
 */
export declare function adjustBrightness(color: string, brightness: number, saturation?: number): string;
/**
 * 颜色添加透明度
 * @param {stirng} color 颜色
 * @param {number} opacity 透明度 0-1
 * @returns {string} 转换后的颜色
 */
export declare const fade: (color: string, opacity: number) => string;
/**
 * Lightens a 6 char HEX color according to the passed percentage
 * @param {string} color The color to change
 * @param {number} amount The amount to change the color by
 * @returns {string} The processed color represented as HEX
 */
export declare function lighten(color: string, amount: number): string;