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/**
 * @name getISOWeekYear
 * @category ISO Week-Numbering Year Helpers
 * @summary Get the ISO week-numbering year of the given date.
 *
 * @description
 * Get the ISO week-numbering year of the given date,
 * which always starts 3 days before the year's first Thursday.
 *
 * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 *
 * @param date - The given date
 *
 * @returns The ISO week-numbering year
 *
 * @example
 * // Which ISO-week numbering year is 2 January 2005?
 * const result = getISOWeekYear(new Date(2005, 0, 2))
 * //=> 2004
 */
export declare function getISOWeekYear<DateType extends Date>(
  date: DateType | number | string,
): number;