12345678910111213141516171819202122232425262728293031323334353637383940414243444546
import getISOWeekYear from '../getISOWeekYear/index.ts'import startOfISOWeek from '../startOfISOWeek/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name endOfISOWeekYear * @category ISO Week-Numbering Year Helpers * @summary Return the end of an ISO week-numbering year for the given date. * * @description * Return the end 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). * * - The function was renamed from `endOfISOYear` to `endOfISOWeekYear`. *   "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., `addWeekYears`. * * @param {Date|Number} date - the original date * @returns {Date} the end of an ISO week-numbering year * @throws {TypeError} 1 argument required * * @example * // The end of an ISO week-numbering year for 2 July 2005: * const result = endOfISOWeekYear(new Date(2005, 6, 2)) * //=> Sun Jan 01 2006 23:59:59.999 */export default function endOfISOWeekYear(dirtyDate: Date | number): Date {  requiredArgs(1, arguments)
  const year = getISOWeekYear(dirtyDate)  const fourthOfJanuaryOfNextYear = new Date(0)  fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4)  fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0)  const date = startOfISOWeek(fourthOfJanuaryOfNextYear)  date.setMilliseconds(date.getMilliseconds() - 1)  return date}