export declare const rgba: (c: string, a: number) => string;
export declare const darken: (c: string, a: number) => string;
export declare const lighten: (c: string, a: number) => string;
export declare const mix: (c: string, b: string, a: number) => string;
export declare const ff: (v: string) => {
    fontFamily: string;
    fontWeight: any;
    fontStyle: any;
};
export declare const ensureContrast: (color1: string, color2: string) => string;
