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mc_test/node_modules/date-fns/esm/startOfISOWeekYear/index.js

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+import getISOWeekYear from "../getISOWeekYear/index.js";
+import startOfISOWeek from "../startOfISOWeek/index.js";
+import requiredArgs from "../_lib/requiredArgs/index.js";
+/**
+ * @name startOfISOWeekYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Return the start of an ISO week-numbering year for the given date.
+ *
+ * @description
+ * Return the start 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
+ *
+ * @param {Date|Number} date - the original date
+ * @returns {Date} the start of an ISO week-numbering year
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // The start of an ISO week-numbering year for 2 July 2005:
+ * const result = startOfISOWeekYear(new Date(2005, 6, 2))
+ * //=> Mon Jan 03 2005 00:00:00
+ */
+export default function startOfISOWeekYear(dirtyDate) {
+  requiredArgs(1, arguments);
+  var year = getISOWeekYear(dirtyDate);
+  var fourthOfJanuary = new Date(0);
+  fourthOfJanuary.setFullYear(year, 0, 4);
+  fourthOfJanuary.setHours(0, 0, 0, 0);
+  var date = startOfISOWeek(fourthOfJanuary);
+  return date;
+}