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"use strict";
exports.startOfISOWeekYear = startOfISOWeekYear;
var _index = require("./getISOWeekYear.js");
var _index2 = require("./startOfISOWeek.js");
var _index3 = require("./constructFrom.js");
/**
* @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
*
* @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 original date
*
* @returns The start of an ISO week-numbering year
*
* @example
* // The start of an ISO week-numbering year for 2 July 2005:
* const result = startOfISOWeekYear(new Date(2005, 6, 2))
* //=> Mon Jan 03 2005 00:00:00
*/
function startOfISOWeekYear(date) {
const year = (0, _index.getISOWeekYear)(date);
const fourthOfJanuary = (0, _index3.constructFrom)(date, 0);
fourthOfJanuary.setFullYear(year, 0, 4);
fourthOfJanuary.setHours(0, 0, 0, 0);
return (0, _index2.startOfISOWeek)(fourthOfJanuary);
}