function startOfISOWeekYear(dirtyDate) {
  __WEBPACK_IMPORTED_MODULE_2__lib_requiredArgs_index_js__["a" /* default */](1, arguments);
  var year = __WEBPACK_IMPORTED_MODULE_0__getISOWeekYear_index_js__["a" /* default */](dirtyDate);
  var fourthOfJanuary = new Date(0);
  fourthOfJanuary.setFullYear(year, 0, 4);
  fourthOfJanuary.setHours(0, 0, 0, 0);
  var date = __WEBPACK_IMPORTED_MODULE_1__startOfISOWeek_index_js__["a" /* default */](fourthOfJanuary);
  return date;
}
@name startOfISOWeekYear
@category ISO Week-Numbering Year Helpers
@summary Return the start of an ISO week-numbering year for the given date.

@description
Return the start of an ISO week-numbering year,
which always starts 3 days before the year's first Thursday.
The result will be in the local timezone.

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).

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

@example
// The start of an ISO week-numbering year for 2 July 2005:
var result = startOfISOWeekYear(new Date(2005, 6, 2))
//=> Mon Jan 03 2005 00:00:00