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backend/node_modules/date-fns/lastDayOfISOWeekYear/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = lastDayOfISOWeekYear;
+var _index = _interopRequireDefault(require("../getISOWeekYear/index.js"));
+var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name lastDayOfISOWeekYear
+ * @category ISO Week-Numbering Year Helpers
+ * @summary Return the last day of an ISO week-numbering year for the given date.
+ *
+ * @description
+ * Return the last day 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 end of an ISO week-numbering year
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // The last day of an ISO week-numbering year for 2 July 2005:
+ * const result = lastDayOfISOWeekYear(new Date(2005, 6, 2))
+ * //=> Sun Jan 01 2006 00:00:00
+ */
+function lastDayOfISOWeekYear(dirtyDate) {
+  (0, _index3.default)(1, arguments);
+  var year = (0, _index.default)(dirtyDate);
+  var fourthOfJanuary = new Date(0);
+  fourthOfJanuary.setFullYear(year + 1, 0, 4);
+  fourthOfJanuary.setHours(0, 0, 0, 0);
+  var date = (0, _index2.default)(fourthOfJanuary);
+  date.setDate(date.getDate() - 1);
+  return date;
+}
+module.exports = exports.default;