FIN INIT

node_modules/date-fns/startOfWeekYear.cjs

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+"use strict";
+exports.startOfWeekYear = startOfWeekYear;
+var _index = require("./_lib/defaultOptions.cjs");
+var _index2 = require("./constructFrom.cjs");
+var _index3 = require("./getWeekYear.cjs");
+var _index4 = require("./startOfWeek.cjs");
+
+/**
+ * The {@link startOfWeekYear} function options.
+ */
+
+/**
+ * @name startOfWeekYear
+ * @category Week-Numbering Year Helpers
+ * @summary Return the start of a local week-numbering year for the given date.
+ *
+ * @description
+ * Return the start of a local week-numbering year.
+ * 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).
+ * @typeParam ResultDate - The result `Date` type.
+ *
+ * @param date - The original date
+ * @param options - An object with options
+ *
+ * @returns The start of a week-numbering year
+ *
+ * @example
+ * // The start of an a week-numbering year for 2 July 2005 with default settings:
+ * const result = startOfWeekYear(new Date(2005, 6, 2))
+ * //=> Sun Dec 26 2004 00:00:00
+ *
+ * @example
+ * // The start of a week-numbering year for 2 July 2005
+ * // if Monday is the first day of week
+ * // and 4 January is always in the first week of the year:
+ * const result = startOfWeekYear(new Date(2005, 6, 2), {
+ *   weekStartsOn: 1,
+ *   firstWeekContainsDate: 4
+ * })
+ * //=> Mon Jan 03 2005 00:00:00
+ */
+function startOfWeekYear(date, options) {
+  const defaultOptions = (0, _index.getDefaultOptions)();
+  const firstWeekContainsDate =
+    options?.firstWeekContainsDate ??
+    options?.locale?.options?.firstWeekContainsDate ??
+    defaultOptions.firstWeekContainsDate ??
+    defaultOptions.locale?.options?.firstWeekContainsDate ??
+    1;
+
+  const year = (0, _index3.getWeekYear)(date, options);
+  const firstWeek = (0, _index2.constructFrom)(options?.in || date, 0);
+  firstWeek.setFullYear(year, 0, firstWeekContainsDate);
+  firstWeek.setHours(0, 0, 0, 0);
+  const _date = (0, _index4.startOfWeek)(firstWeek, options);
+  return _date;
+}