function getISOWeekYear(dirtyDate) {
  __WEBPACK_IMPORTED_MODULE_2__lib_requiredArgs_index_js__["a" /* default */](1, arguments);
  var date = __WEBPACK_IMPORTED_MODULE_0__toDate_index_js__["a" /* default */](dirtyDate);
  var year = date.getFullYear();
  var fourthOfJanuaryOfNextYear = new Date(0);
  fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
  fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
  var startOfNextYear = __WEBPACK_IMPORTED_MODULE_1__startOfISOWeek_index_js__["a" /* default */](fourthOfJanuaryOfNextYear);
  var fourthOfJanuaryOfThisYear = new Date(0);
  fourthOfJanuaryOfThisYear.setFullYear(year, 0, 4);
  fourthOfJanuaryOfThisYear.setHours(0, 0, 0, 0);
  var startOfThisYear = __WEBPACK_IMPORTED_MODULE_1__startOfISOWeek_index_js__["a" /* default */](fourthOfJanuaryOfThisYear);

  if (date.getTime() >= startOfNextYear.getTime()) {
    return year + 1;
  } else if (date.getTime() >= startOfThisYear.getTime()) {
    return year;
  } else {
    return year - 1;
  }
}
@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

### v2.0.0 breaking changes:

- [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).

- The function was renamed from `getISOYear` to `getISOWeekYear`.
  "ISO week year" is short for [ISO week-numbering year](https://en.wikipedia.org/wiki/ISO_week_date).
  This change makes the name consistent with
  locale-dependent week-numbering year helpers, e.g., `getWeekYear`.

@param {Date|Number} date - the given date
@returns {Number} the ISO week-numbering year
@throws {TypeError} 1 argument required

@example
// Which ISO-week numbering year is 2 January 2005?
var result = getISOWeekYear(new Date(2005, 0, 2))
//=> 2004