import { ColorAccessor, ColorFunction } from '../types/accessor';

type RGBColor = {
    r: number;
    g: number;
    b: number;
};
export declare const UnovisColorScale: import('d3-scale').ScaleOrdinal<string | number, string, never>;
/** Retrieves color from the data if provided; fallbacks to CSS variables if the index was passed */
export declare function getColor<T>(d: T, accessorOrValue: ColorAccessor<T>, index?: number, key?: string | boolean, // Todo: Remove (key === true) in Unovis 2.0. We have is only for backward compatibility, it used to be `dontFallbackToCssVar`
options?: {
    dontFallbackToCssVar?: boolean;
    colorFn?: ColorFunction;
}): string | null;
export declare function hexToRgb(hex: string): RGBColor;
export declare function rgbToBrightness(rgb: RGBColor): number;
export declare function hexToBrightness(hex: string): number;
export declare function getHexValue(s: string, context: HTMLElement | SVGElement): string;
export declare function rgbaToRgb(rgba: string, backgroundColor?: string): RGBColor;
/**
 * Makes a color brighter by a certain amount
 * @param inputColor - The color to brighten (hex, rgb, or rgba)
 * @param amount - Amount to brighten by (0-1)
 * @returns The brightened color in hex format
 */
export declare function brighter(inputColor: string, amount: number): string;
export declare function isColorDark(color: string, threshold?: number): boolean;
export {};