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import addDays from '../addDays/index.ts'import addMonths from '../addMonths/index.ts'import toDate from '../toDate/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'import toInteger from '../_lib/toInteger/index.ts'import { Duration } from '../types.ts'
/** * @name add * @category Common Helpers * @summary Add the specified years, months, weeks, days, hours, minutes and seconds to the given date. * * @description * Add the specified years, months, weeks, days, hours, minutes and seconds to the given date. * * @param {Date|Number} date - the date to be changed * @param {Duration} duration - the object with years, months, weeks, days, hours, minutes and seconds to be added. Positive decimals will be rounded using `Math.floor`, decimals less than zero will be rounded using `Math.ceil`. * * | Key            | Description                        | * |----------------|------------------------------------| * | years          | Amount of years to be added        | * | months         | Amount of months to be added       | * | weeks          | Amount of weeks to be added       | * | days           | Amount of days to be added         | * | hours          | Amount of hours to be added        | * | minutes        | Amount of minutes to be added      | * | seconds        | Amount of seconds to be added      | * * All values default to 0 * * @returns {Date} the new date with the seconds added * @throws {TypeError} 2 arguments required * * @example * // Add the following duration to 1 September 2014, 10:19:50 * const result = add(new Date(2014, 8, 1, 10, 19, 50), { *   years: 2, *   months: 9, *   weeks: 1, *   days: 7, *   hours: 5, *   minutes: 9, *   seconds: 30, * }) * //=> Thu Jun 15 2017 15:29:20 */export default function add(  dirtyDate: Date | number,  duration: Duration): Date {  requiredArgs(2, arguments)
  if (!duration || typeof duration !== 'object') return new Date(NaN)
  const years = 'years' in duration ? toInteger(duration.years) : 0  const months = 'months' in duration ? toInteger(duration.months) : 0  const weeks = 'weeks' in duration ? toInteger(duration.weeks) : 0  const days = 'days' in duration ? toInteger(duration.days) : 0  const hours = 'hours' in duration ? toInteger(duration.hours) : 0  const minutes = 'minutes' in duration ? toInteger(duration.minutes) : 0  const seconds = 'seconds' in duration ? toInteger(duration.seconds) : 0
  // Add years and months  const date = toDate(dirtyDate)  const dateWithMonths =    months || years ? addMonths(date, months + years * 12) : date
  // Add weeks and days  const dateWithDays =    days || weeks ? addDays(dateWithMonths, days + weeks * 7) : dateWithMonths
  // Add days, hours, minutes and seconds  const minutesToAdd = minutes + hours * 60  const secondsToAdd = seconds + minutesToAdd * 60  const msToAdd = secondsToAdd * 1000  const finalDate = new Date(dateWithDays.getTime() + msToAdd)
  return finalDate}