import type { number_percent } from '../../../types/typeAliases';
import type { ColorTransformer } from './ColorTransformer';
/**
 * Makes color transformer which darker the given color
 *
 * @param amount from 0 to 1
 *
 * @public exported from `@promptbook/color`
 */
export declare function darken(amount: number_percent): ColorTransformer;
