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import differenceInCalendarDays from '../differenceInCalendarDays/index.ts'import startOfWeekYear from '../startOfWeekYear/index.js'import toDate from '../toDate/index.ts'import toInteger from '../_lib/toInteger/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name setWeekYear * @category Week-Numbering Year Helpers * @summary Set the local week-numbering year to the given date. * * @description * Set the local week-numbering year to the given date, * saving the week number and the weekday number. * The exact calculation depends on the values of * `options.weekStartsOn` (which is the index of the first day of the week) * and `options.firstWeekContainsDate` (which is the day of January, which is always in * the first week of the week-numbering year) * * Week numbering: https://en.wikipedia.org/wiki/Week#Week_numbering * * ### 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 date to be changed * @param {Number} weekYear - the local week-numbering year of the new date * @param {Object} [options] - an object with options. * @param {Locale} [options.locale=defaultLocale] - the locale object. See [Locale]{@link https://date-fns.org/docs/Locale} * @param {0|1|2|3|4|5|6} [options.weekStartsOn=0] - the index of the first day of the week (0 - Sunday) * @param {1|2|3|4|5|6|7} [options.firstWeekContainsDate=1] - the day of January, which is always in the first week of the year * @returns {Date} the new date with the local week-numbering year set * @throws {TypeError} 2 arguments required * @throws {RangeError} `options.weekStartsOn` must be between 0 and 6 * @throws {RangeError} `options.firstWeekContainsDate` must be between 1 and 7 * * @example * // Set the local week-numbering year 2004 to 2 January 2010 with default options: * var result = setWeekYear(new Date(2010, 0, 2), 2004) * //=> Sat Jan 03 2004 00:00:00 * * @example * // Set the local week-numbering year 2004 to 2 January 2010, * // if Monday is the first day of week * // and 4 January is always in the first week of the year: * var result = setWeekYear(new Date(2010, 0, 2), 2004, { *   weekStartsOn: 1, *   firstWeekContainsDate: 4 * }) * //=> Sat Jan 01 2005 00:00:00 */export default function setWeekYear(dirtyDate, dirtyWeekYear, dirtyOptions) {  requiredArgs(2, arguments)
  var options = dirtyOptions || {}  var locale = options.locale  var localeFirstWeekContainsDate =    locale && locale.options && locale.options.firstWeekContainsDate  var defaultFirstWeekContainsDate =    localeFirstWeekContainsDate == null      ? 1      : toInteger(localeFirstWeekContainsDate)  var firstWeekContainsDate =    options.firstWeekContainsDate == null      ? defaultFirstWeekContainsDate      : toInteger(options.firstWeekContainsDate)
  var date = toDate(dirtyDate)  var weekYear = toInteger(dirtyWeekYear)  var diff = differenceInCalendarDays(date, startOfWeekYear(date, dirtyOptions))  var firstWeek = new Date(0)  firstWeek.setFullYear(weekYear, 0, firstWeekContainsDate)  firstWeek.setHours(0, 0, 0, 0)  date = startOfWeekYear(firstWeek, dirtyOptions)  date.setDate(date.getDate() + diff)  return date}