import type { DayOfWeek } from '../constants';
declare type Options = {
    /** Use the UTC timezone */
    UTC?: boolean;
    /** Week 1 is definied as the week with the Gregoriain year's first [weekOneInclues] day in it */
    weekOneIncludes?: DayOfWeek;
    /** The first day of the week */
    firstDayOfWeek?: DayOfWeek;
};
/**
 * Determine the ISO week number for a given date
 *
 * @param input The date
 * @param __namedParameteres see {@link Options}
 * @default weekOneIncludes Thursday
 * @default firstDayOfWeek Monday
 * @returns the week number (1-53)
 */
export declare function getISOWeekOfYear(input: Date, { UTC, weekOneIncludes, firstDayOfWeek }?: Options): {
    year: number;
    week: number;
};
export default getISOWeekOfYear;