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- "use strict";
- var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
- Object.defineProperty(exports, "__esModule", {
- value: true
- });
- exports.default = startOfISOWeekYear;
- var _index = _interopRequireDefault(require("../getISOWeekYear/index.js"));
- var _index2 = _interopRequireDefault(require("../startOfISOWeek/index.js"));
- var _index3 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
- /**
- * @name startOfISOWeekYear
- * @category ISO Week-Numbering Year Helpers
- * @summary Return the start of an ISO week-numbering year for the given date.
- *
- * @description
- * Return the start 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 start of an ISO week-numbering year
- * @throws {TypeError} 1 argument required
- *
- * @example
- * // The start of an ISO week-numbering year for 2 July 2005:
- * const result = startOfISOWeekYear(new Date(2005, 6, 2))
- * //=> Mon Jan 03 2005 00:00:00
- */
- function startOfISOWeekYear(dirtyDate) {
- (0, _index3.default)(1, arguments);
- var year = (0, _index.default)(dirtyDate);
- var fourthOfJanuary = new Date(0);
- fourthOfJanuary.setFullYear(year, 0, 4);
- fourthOfJanuary.setHours(0, 0, 0, 0);
- var date = (0, _index2.default)(fourthOfJanuary);
- return date;
- }
- module.exports = exports.default;
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