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+import getWeek from "../getWeek/index.js";
+import toDate from "../toDate/index.js";
+import requiredArgs from "../_lib/requiredArgs/index.js";
+import toInteger from "../_lib/toInteger/index.js";
+/**
+ * @name setWeek
+ * @category Week Helpers
+ * @summary Set the local week to the given date.
+ *
+ * @description
+ * Set the local week to the given date, saving 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
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} week - the week 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 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 1st week to 2 January 2005 with default options:
+ * const result = setWeek(new Date(2005, 0, 2), 1)
+ * //=> Sun Dec 26 2004 00:00:00
+ *
+ * @example
+ * // Set the 1st week to 2 January 2005,
+ * // if Monday is the first day of the week,
+ * // and the first week of the year always contains 4 January:
+ * const result = setWeek(new Date(2005, 0, 2), 1, {
+ *   weekStartsOn: 1,
+ *   firstWeekContainsDate: 4
+ * })
+ * //=> Sun Jan 4 2004 00:00:00
+ */
+export default function setWeek(dirtyDate, dirtyWeek, options) {
+  requiredArgs(2, arguments);
+  var date = toDate(dirtyDate);
+  var week = toInteger(dirtyWeek);
+  var diff = getWeek(date, options) - week;
+  date.setDate(date.getDate() - diff * 7);
+  return date;
+}
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