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import toDate from '../toDate/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name lastDayOfDecade * @category Decade Helpers * @summary Return the last day of a decade for the given date. * * @description * Return the last day of a decade for the given date. * * ### v2.0.0 breaking changes: * * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes). * * @param {Date|Number} date - the original date * @returns {Date} the last day of a decade * @throws {TypeError} 1 argument required * * @example * // The last day of a decade for 21 December 2012 21:12:00: * var result = lastDayOfDecade(new Date(2012, 11, 21, 21, 12, 00)) * //=> Wed Dec 31 2019 00:00:00 */export default function lastDayOfDecade(dirtyDate: Date | number): Date {  requiredArgs(1, arguments)
  const date = toDate(dirtyDate)  const year = date.getFullYear()  const decade = 9 + Math.floor(year / 10) * 10  date.setFullYear(decade + 1, 0, 0)  date.setHours(0, 0, 0, 0)  return date}