text: "use strict";
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = setWeekYear;
  
  var _index = _interopRequireDefault(require("../differenceInCalendarDays/index.js"));
  
  var _index2 = _interopRequireDefault(require("../startOfWeekYear/index.js"));
  
  var _index3 = _interopRequireDefault(require("../toDate/index.js"));
  
  var _index4 = _interopRequireDefault(require("../_lib/toInteger/index.js"));
  
  var _index5 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  /**
   * @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
   */
  function setWeekYear(dirtyDate, dirtyWeekYear, dirtyOptions) {
    (0, _index5.default)(2, arguments);
    var options = dirtyOptions || {};
    var locale = options.locale;
    var localeFirstWeekContainsDate = locale && locale.options && locale.options.firstWeekContainsDate;
    var defaultFirstWeekContainsDate = localeFirstWeekContainsDate == null ? 1 : (0, _index4.default)(localeFirstWeekContainsDate);
    var firstWeekContainsDate = options.firstWeekContainsDate == null ? defaultFirstWeekContainsDate : (0, _index4.default)(options.firstWeekContainsDate);
    var date = (0, _index3.default)(dirtyDate);
    var weekYear = (0, _index4.default)(dirtyWeekYear);
    var diff = (0, _index.default)(date, (0, _index2.default)(date, dirtyOptions));
    var firstWeek = new Date(0);
    firstWeek.setFullYear(weekYear, 0, firstWeekContainsDate);
    firstWeek.setHours(0, 0, 0, 0);
    date = (0, _index2.default)(firstWeek, dirtyOptions);
    date.setDate(date.getDate() + diff);
    return date;
  }
  
  module.exports = exports.default;