import type { MaybeColor } from "./api.js";
/**
 * Computes the WCAG 2.0 contrast ratio of the two given colors (order is
 * irrelevant). Contrast ratios can range from 1 to 21.
 *
 * @remarks
 * For accessibility guideline conformance, the visual presentation of text must
 * have a minimum contrast ratio of at least 4.5 (with some exceptions).
 *
 * Reference: https://www.w3.org/TR/WCAG20/#contrast-ratiodef
 *
 * @param a
 * @param b
 */
export declare const contrast: (a: MaybeColor, b: MaybeColor) => number;
//# sourceMappingURL=contrast.d.ts.map