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import isWeekend from '../isWeekend/index.ts'import toDate from '../toDate/index.ts'import toInteger from '../_lib/toInteger/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'import isSunday from '../isSunday/index.ts'import isSaturday from '../isSaturday/index.ts'
/** * @name addBusinessDays * @category Day Helpers * @summary Add the specified number of business days (mon - fri) to the given date. * * @description * Add the specified number of business days (mon - fri) to the given date, ignoring weekends. * * @param {Date|Number} date - the date to be changed * @param {Number} amount - the amount of business days to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`. * @returns {Date} the new date with the business days added * @throws {TypeError} 2 arguments required * * @example * // Add 10 business days to 1 September 2014: * const result = addBusinessDays(new Date(2014, 8, 1), 10) * //=> Mon Sep 15 2014 00:00:00 (skipped weekend days) */export default function addBusinessDays(  dirtyDate: Date | number,  dirtyAmount: number): Date {  requiredArgs(2, arguments)
  const date = toDate(dirtyDate)  const startedOnWeekend = isWeekend(date)  const amount = toInteger(dirtyAmount)
  if (isNaN(amount)) return new Date(NaN)
  const hours = date.getHours()  const sign = amount < 0 ? -1 : 1  const fullWeeks = toInteger(amount / 5)
  date.setDate(date.getDate() + fullWeeks * 7)
  // Get remaining days not part of a full week  let restDays = Math.abs(amount % 5)
  // Loops over remaining days  while (restDays > 0) {    date.setDate(date.getDate() + sign)    if (!isWeekend(date)) restDays -= 1  }
  // If the date is a weekend day and we reduce a dividable of  // 5 from it, we land on a weekend date.  // To counter this, we add days accordingly to land on the next business day  if (startedOnWeekend && isWeekend(date) && amount !== 0) {    // If we're reducing days, we want to add days until we land on a weekday    // If we're adding days we want to reduce days until we land on a weekday    if (isSaturday(date)) date.setDate(date.getDate() + (sign < 0 ? 2 : -1))    if (isSunday(date)) date.setDate(date.getDate() + (sign < 0 ? 1 : -2))  }
  // Restore hours to avoid DST lag  date.setHours(hours)
  return date}