export declare function isHexColor(color: string): boolean;
export declare function rgbToHex(r: number, g: number, b: number): string;
export declare function hexToRGB(hex: string): string;
export declare function colorIsDark(color: string): boolean | undefined;
export declare function fade(color: string, amount: number): string;
export declare function darken(color: string, amount: number): string;
export declare function lighten(color: string, amount: number): string;
export declare function addLight(color: string, amount: number): string;
export declare function calculateBestTextColor(hexColor: string): "#000000" | "#FFFFFF";