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import toDate from '../toDate/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name closestIndexTo * @category Common Helpers * @summary Return an index of the closest date from the array comparing to the given date. * * @description * Return an index of the closest date from the array comparing to 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). * * - Now, `closestIndexTo` doesn't throw an exception *   when the second argument is not an array, and returns Invalid Date instead. * * @param {Date|Number} dateToCompare - the date to compare with * @param {Date[]|Number[]} datesArray - the array to search * @returns {Number} an index of the date closest to the given date * @throws {TypeError} 2 arguments required * * @example * // Which date is closer to 6 September 2015? * var dateToCompare = new Date(2015, 8, 6) * var datesArray = [ *   new Date(2015, 0, 1), *   new Date(2016, 0, 1), *   new Date(2017, 0, 1) * ] * var result = closestIndexTo(dateToCompare, datesArray) * //=> 1 */export default function closestIndexTo(dirtyDateToCompare, dirtyDatesArray) {  requiredArgs(2, arguments)
  var dateToCompare = toDate(dirtyDateToCompare)
  if (isNaN(dateToCompare)) {    return NaN  }
  var timeToCompare = dateToCompare.getTime()
  var datesArray  // `dirtyDatesArray` is undefined or null  if (dirtyDatesArray == null) {    datesArray = []
    // `dirtyDatesArray` is Array, Set or Map, or object with custom `forEach` method  } else if (typeof dirtyDatesArray.forEach === 'function') {    datesArray = dirtyDatesArray
    // If `dirtyDatesArray` is Array-like Object, convert to Array. Otherwise, make it empty Array  } else {    datesArray = Array.prototype.slice.call(dirtyDatesArray)  }
  var result  var minDistance  datesArray.forEach(function(dirtyDate, index) {    var currentDate = toDate(dirtyDate)
    if (isNaN(currentDate)) {      result = NaN      minDistance = NaN      return    }
    var distance = Math.abs(timeToCompare - currentDate.getTime())    if (result == null || distance < minDistance) {      result = index      minDistance = distance    }  })
  return result}