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"use strict";
exports.getISOWeeksInYear = getISOWeeksInYear;
var _index = require("./addWeeks.js");
var _index2 = require("./constants.js");
var _index3 = require("./startOfISOWeekYear.js");
/**
* @name getISOWeeksInYear
* @category ISO Week-Numbering Year Helpers
* @summary Get the number of weeks in an ISO week-numbering year of the given date.
*
* @description
* Get the number of weeks in an ISO week-numbering year of the given date.
*
* 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 number of ISO weeks in a year
*
* @example
* // How many weeks are in ISO week-numbering year 2015?
* const result = getISOWeeksInYear(new Date(2015, 1, 11))
* //=> 53
*/
function getISOWeeksInYear(date) {
const thisYear = (0, _index3.startOfISOWeekYear)(date);
const nextYear = (0, _index3.startOfISOWeekYear)(
(0, _index.addWeeks)(thisYear, 60),
);
const diff = +nextYear - +thisYear;
// Round the number of weeks to the nearest integer because the number of
// milliseconds in a week is not constant (e.g. it's different in the week of
// the daylight saving time clock shift).
return Math.round(diff / _index2.millisecondsInWeek);
}