import { CSSProperties } from "react";
/**
 * Given a background color and two foreground color options, returns the
 * foreground color with the best contrast ratio to the background color.
 */
export declare const testContrast: (bg: CSSProperties["color"], fg1: CSSProperties["color"], fg2: CSSProperties["color"], skewReturnLighter?: number) => CSSProperties["color"];
/**
 * Returns the contrast ratio between two luminances
 */
export declare const getContrast: (bgLuminance: number, fgLuminance: number) => number;
/**
 * Returns the luminance value of a CSS color
 */
export declare const getLuminance: (color: CSSProperties["color"]) => number;
/**
 * Converts a CSS color string to RGB values
 */
export declare const cssColorToRGB: (color: CSSProperties["color"]) => number[];
export declare const RGBToHSL: ([r, g, b]: number[]) => number[];