📝 Commit Details:

backend/node_modules/date-fns/getISOWeekYear.cjs

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+"use strict";
+exports.getISOWeekYear = getISOWeekYear;
+var _index = require("./constructFrom.cjs");
+var _index2 = require("./startOfISOWeek.cjs");
+var _index3 = require("./toDate.cjs");
+
+/**
+ * The {@link getISOWeekYear} function options.
+ */
+
+/**
+ * @name getISOWeekYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Get the ISO week-numbering year of the given date.
+ *
+ * @description
+ * Get the ISO week-numbering year of the given date,
+ * which always starts 3 days before the year's first Thursday.
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @param date - The given date
+ *
+ * @returns The ISO week-numbering year
+ *
+ * @example
+ * // Which ISO-week numbering year is 2 January 2005?
+ * const result = getISOWeekYear(new Date(2005, 0, 2))
+ * //=> 2004
+ */
+function getISOWeekYear(date, options) {
+  const _date = (0, _index3.toDate)(date, options?.in);
+  const year = _date.getFullYear();
+
+  const fourthOfJanuaryOfNextYear = (0, _index.constructFrom)(_date, 0);
+  fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
+  fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
+  const startOfNextYear = (0, _index2.startOfISOWeek)(
+    fourthOfJanuaryOfNextYear,
+  );
+
+  const fourthOfJanuaryOfThisYear = (0, _index.constructFrom)(_date, 0);
+  fourthOfJanuaryOfThisYear.setFullYear(year, 0, 4);
+  fourthOfJanuaryOfThisYear.setHours(0, 0, 0, 0);
+  const startOfThisYear = (0, _index2.startOfISOWeek)(
+    fourthOfJanuaryOfThisYear,
+  );
+
+  if (_date.getTime() >= startOfNextYear.getTime()) {
+    return year + 1;
+  } else if (_date.getTime() >= startOfThisYear.getTime()) {
+    return year;
+  } else {
+    return year - 1;
+  }
+}