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node_modules/date-fns/getISOWeeksInYear.js

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+"use strict";
+exports.getISOWeeksInYear = getISOWeeksInYear;
+var _index = require("./addWeeks.js");
+var _index2 = require("./constants.js");
+var _index3 = require("./startOfISOWeekYear.js");
+
+/**
+ * @name getISOWeeksInYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Get the number of weeks in an ISO week-numbering year of the given date.
+ *
+ * @description
+ * Get the number of weeks in an ISO week-numbering year of the given date.
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ *
+ * @param date - The given date
+ *
+ * @returns The number of ISO weeks in a year
+ *
+ * @example
+ * // How many weeks are in ISO week-numbering year 2015?
+ * const result = getISOWeeksInYear(new Date(2015, 1, 11))
+ * //=> 53
+ */
+function getISOWeeksInYear(date) {
+  const thisYear = (0, _index3.startOfISOWeekYear)(date);
+  const nextYear = (0, _index3.startOfISOWeekYear)(
+    (0, _index.addWeeks)(thisYear, 60),
+  );
+  const diff = +nextYear - +thisYear;
+
+  // Round the number of weeks to the nearest integer because the number of
+  // milliseconds in a week is not constant (e.g. it's different in the week of
+  // the daylight saving time clock shift).
+  return Math.round(diff / _index2.millisecondsInWeek);
+}