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import isValid from '../isValid/index.js'import isWeekend from '../isWeekend/index.ts'import toDate from '../toDate/index.ts'import differenceInCalendarDays from '../differenceInCalendarDays/index.ts'import addDays from '../addDays/index.ts'import isSameDay from '../isSameDay/index.ts'import toInteger from '../_lib/toInteger/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name differenceInBusinessDays * @category Day Helpers * @summary Get the number of business days between the given dates. * * @description * Get the number of business day periods between the given dates. * Business days being days that arent in the weekend. * Like `differenceInCalendarDays`, the function removes the times from * the dates before calculating the difference. * * @param {Date|Number} dateLeft - the later date * @param {Date|Number} dateRight - the earlier date * @returns {Number} the number of business days * @throws {TypeError} 2 arguments required * * @example * // How many business days are between * // 10 January 2014 and 20 July 2014? * var result = differenceInBusinessDays( *   new Date(2014, 6, 20), *   new Date(2014, 0, 10) * ) * //=> 136 */export default function differenceInBusinessDays(  dirtyDateLeft: Date | number,  dirtyDateRight: Date | number): number {  requiredArgs(2, arguments)
  const dateLeft = toDate(dirtyDateLeft)  let dateRight = toDate(dirtyDateRight)
  if (!isValid(dateLeft) || !isValid(dateRight)) return NaN
  const calendarDifference = differenceInCalendarDays(dateLeft, dateRight)  const sign = calendarDifference < 0 ? -1 : 1
  const weeks = toInteger(calendarDifference / 7)
  let result = weeks * 5  dateRight = addDays(dateRight, weeks * 7)
  // the loop below will run at most 6 times to account for the remaining days that don't makeup a full week  while (!isSameDay(dateLeft, dateRight)) {    // sign is used to account for both negative and positive differences    result += isWeekend(dateRight) ? 0 : sign    dateRight = addDays(dateRight, sign)  }
  return result === 0 ? 0 : result}