import { HexString } from "./hexToRGB";
/**
 * A number closest to 0 should be closest to black while a number closest to 1
 * should be closest to white.
 *
 * @see https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
 * @private
 */
export default function getLuminance(color: HexString): number;