import { Contrastrast } from "../contrastrast.js";
/**
 * Calculate the WCAG 2.1 contrast ratio between two colors
 * @param color1 First color (Contrastrast instance or color string)
 * @param color2 Second color (Contrastrast instance or color string)
 * @returns Contrast ratio (1:1 to 21:1)
 */
export declare const contrastRatio: (color1: Contrastrast | string, color2: Contrastrast | string) => number;
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