declare const WEEK_STARTS: {
    readonly mon: "mon";
    readonly sun: "sun";
    readonly sat: "sat";
};
export type WEEK_START = keyof typeof WEEK_STARTS;
/**
 * Formats the provided date according to a specific spec
 *
 * @param {Date|string} val - Date to format
 * @param {string} spec - Spec to format the date to
 * @param {string} locale - Locale to format the date in (only used in certain tokens such as dddd and MMMM)
 * @param {string} zone - (default=current timezone) Pass the timezone to convert into. If not passed no conversion will happen
 * @param {string} sow - (default='mon') Start of week (only useful when working with the 'W' and 'w' tokens for week numbers
 * @throws {TypeError} When provided invalid payload
 */
declare function format(val: Date | string, spec: string, locale?: string, zone?: string, sow?: WEEK_START): string;
declare namespace format {
    var getLocale: () => string;
    var setLocale: (locale: string) => void;
    var getZone: () => string;
    var setZone: (zone: string) => void;
    var getStartOfWeek: () => "mon" | "sun" | "sat";
    var setStartOfWeek: (sow: WEEK_START) => void;
}
export { format, format as default };