export declare function isColorCode(color: string): boolean;
export declare function extractColorHex(color: string): RegExpExecArray | null;
export declare function colorHexToRgb(color: string, alpha?: string | undefined): string;
export declare function colorCodeToRgba(color: string, opacity: number): string;
export declare function getColorCode(color: string): string | undefined;
export declare function calculateColorBrightness(color: string): number;