import { FormatDateParams } from "./format-date.js";
/**
 * Retrieves the day of the week from a given date as a string.
 *
 * @param {Date | string | null} date - The date to retrieve the day from. Defaults to the current date.
 * @param {"short" | "long"} [format="short"] - The format of the day name to return. Defaults to "short".
 * @returns {string} The day name as a string (e.g. "Mon" or "Monday").
 */
export declare function getDayName(date?: Date | string | null, format?: FormatDateParams["dayFormat"]): string;