v1.0 with SW PWA enabled

frontend/node_modules/date-fns/getWeek.js

@@ -0,0 +1,59 @@
+"use strict";
+exports.getWeek = getWeek;
+var _index = require("./constants.js");
+var _index2 = require("./startOfWeek.js");
+var _index3 = require("./startOfWeekYear.js");
+var _index4 = require("./toDate.js");
+
+/**
+ * The {@link getWeek} function options.
+ */
+
+/**
+ * @name getWeek
+ * @category Week Helpers
+ * @summary Get the local week index of the given date.
+ *
+ * @description
+ * Get the local week index of the given date.
+ * 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#The_ISO_week_date_system
+ *
+ * @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
+ * @param options - An object with options
+ *
+ * @returns The week
+ *
+ * @example
+ * // Which week of the local week numbering year is 2 January 2005 with default options?
+ * const result = getWeek(new Date(2005, 0, 2))
+ * //=> 2
+ *
+ * @example
+ * // Which week of the local week numbering year is 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 = getWeek(new Date(2005, 0, 2), {
+ *   weekStartsOn: 1,
+ *   firstWeekContainsDate: 4
+ * })
+ * //=> 53
+ */
+
+function getWeek(date, options) {
+  const _date = (0, _index4.toDate)(date);
+  const diff =
+    +(0, _index2.startOfWeek)(_date, options) -
+    +(0, _index3.startOfWeekYear)(_date, options);
+
+  // 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 / _index.millisecondsInWeek) + 1;
+}