export interface RgbColor {
    r: number;
    g: number;
    b: number;
}
export interface RgbaColor extends RgbColor {
    a: number;
}
export type ColorInput = string | number | [number, number, number] | [number, number, number, number] | RgbColor | RgbaColor | null;
export declare function hslToRgb(h: number, s: number, l: number): RgbColor;
export declare function parseColor(input: ColorInput): RgbaColor | null;
export declare function colorToHex(color: RgbColor): string;
export declare function relativeLuminance(color: RgbColor): number;
export declare function contrastRatio(foreground: RgbColor, background: RgbColor): number;
export declare function readableTextColor(background: RgbColor, light?: RgbColor, dark?: RgbColor): RgbColor;