1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950
import toInteger from '../_lib/toInteger/index.ts'import toDate from '../toDate/index.ts'import startOfISOWeekYear from '../startOfISOWeekYear/index.ts'import differenceInCalendarDays from '../differenceInCalendarDays/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name setISOWeekYear * @category ISO Week-Numbering Year Helpers * @summary Set the ISO week-numbering year to the given date. * * @description * Set the ISO week-numbering year to the given date, * saving the week number and the weekday number. * * 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 `setISOYear` to `setISOWeekYear`. *   "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., `setWeekYear`. * * @param {Date|Number} date - the date to be changed * @param {Number} isoWeekYear - the ISO week-numbering year of the new date * @returns {Date} the new date with the ISO week-numbering year set * @throws {TypeError} 2 arguments required * * @example * // Set ISO week-numbering year 2007 to 29 December 2008: * const result = setISOWeekYear(new Date(2008, 11, 29), 2007) * //=> Mon Jan 01 2007 00:00:00 */export default function setISOWeekYear(dirtyDate: Date | number, dirtyISOWeekYear: number): Date {  requiredArgs(2, arguments)
  let date = toDate(dirtyDate)  const isoWeekYear = toInteger(dirtyISOWeekYear)  const diff = differenceInCalendarDays(date, startOfISOWeekYear(date))  const fourthOfJanuary = new Date(0)  fourthOfJanuary.setFullYear(isoWeekYear, 0, 4)  fourthOfJanuary.setHours(0, 0, 0, 0)  date = startOfISOWeekYear(fourthOfJanuary)  date.setDate(date.getDate() + diff)  return date}