import { DateLib, type DateLibOptions } from "../classes/DateLib.js";
/**
 * Format the weekday name to be displayed in the weekdays header.
 *
 * @defaultValue `cccccc` (e.g. "Mo" for Monday)
 * @group Formatters
 * @see https://daypicker.dev/docs/translation#custom-formatters
 */
export declare function formatWeekdayName(weekday: Date, options?: DateLibOptions, dateLib?: DateLib): string;