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

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = getISOWeeksInYear;
+var _index = _interopRequireDefault(require("../startOfISOWeekYear/index.js"));
+var _index2 = _interopRequireDefault(require("../addWeeks/index.js"));
+var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+var MILLISECONDS_IN_WEEK = 604800000;
+
+/**
+ * @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
+ *
+ * @param {Date|Number} date - the given date
+ * @returns {Number} the number of ISO weeks in a year
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // How many weeks are in ISO week-numbering year 2015?
+ * const result = getISOWeeksInYear(new Date(2015, 1, 11))
+ * //=> 53
+ */
+function getISOWeeksInYear(dirtyDate) {
+  (0, _index3.default)(1, arguments);
+  var thisYear = (0, _index.default)(dirtyDate);
+  var nextYear = (0, _index.default)((0, _index2.default)(thisYear, 60));
+  var diff = nextYear.valueOf() - thisYear.valueOf();
+  // 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 / MILLISECONDS_IN_WEEK);
+}
+module.exports = exports.default;