PHP's ksort in JavaScript

module.exports = functionksort (inputArr, sortFlags) {
//  discuss at: https://locutus.io/php/ksort/
// original by: GeekFG (https://geekfg.blogspot.com)
// improved by: Kevin van Zonneveld (https://kvz.io)
// improved by: Brett Zamir (https://brett-zamir.me)
//      note 1: This function deviates from PHP in returning a copy of the array instead
//      note 1: of acting by reference and returning true; this was necessary because
//      note 1: IE does not allow deleting and re-adding of properties without caching
//      note 1: of property position; you can set the ini of "locutus.sortByReference" to true to
//      note 1: get the PHP behavior, but use this only if you are in an environment
//      note 1: such as Firefox extensions where for-in iteration order is fixed and true
//      note 1: property deletion is supported. Note that we intend to implement the PHP
//      note 1: behavior by default if IE ever does allow it; only gives shallow copy since
//      note 1: is by reference in PHP anyways
//      note 1: Since JS objects' keys are always strings, and (the
//      note 1: default) SORT_REGULAR flag distinguishes by key type,
//      note 1: if the content is a numeric string, we treat the
//      note 1: "original type" as numeric.
//   example 1: var $data = {d: 'lemon', a: 'orange', b: 'banana', c: 'apple'}
//   example 1: ksort($data)
//   example 1: var $result = $data
//   returns 1: {a: 'orange', b: 'banana', c: 'apple', d: 'lemon'}
//   example 2: ini_set('locutus.sortByReference', true)
//   example 2: var $data = {2: 'van', 3: 'Zonneveld', 1: 'Kevin'}
//   example 2: ksort($data)
//   example 2: var $result = $data
//   returns 2: {1: 'Kevin', 2: 'van', 3: 'Zonneveld'}
const i18nlgd = require('../i18n/i18n_loc_get_default')
const strnatcmp = require('../strings/strnatcmp')
const tmpArr = {}
const keys = []
let sorter
let i
let k
let sortByReference = false
let populateArr = {}
const $global = (typeofwindow !== 'undefined' ? window : global)
  $global.$locutus = $global.$locutus || {}
const $locutus = $global.$locutus
  $locutus.php = $locutus.php || {}
  $locutus.php.locales = $locutus.php.locales || {}
switch (sortFlags) {
case'SORT_STRING':
// compare items as strings
      sorter = function (a, b) {
return strnatcmp(b, a)
      }
break
case'SORT_LOCALE_STRING':
// compare items as strings, based on the current locale
// (set with i18n_loc_set_default() as of PHP6)
var loc = i18nlgd()
      sorter = $locutus.locales[loc].sorting
break
case'SORT_NUMERIC':
// compare items numerically
      sorter = function (a, b) {
return ((a + 0) - (b + 0))
      }
break
default:
// case 'SORT_REGULAR': // compare items normally (don't change types)
      sorter = function (a, b) {
const aFloat = parseFloat(a)
const bFloat = parseFloat(b)
const aNumeric = aFloat + '' === a
const bNumeric = bFloat + '' === b
if (aNumeric && bNumeric) {
return aFloat > bFloat ? 1 : aFloat < bFloat ? -1 : 0
        } elseif (aNumeric && !bNumeric) {
return1
        } elseif (!aNumeric && bNumeric) {
return-1
        }
return a > b ? 1 : a < b ? -1 : 0
      }
break
  }
// Make a list of key names
for (k in inputArr) {
if (inputArr.hasOwnProperty(k)) {
      keys.push(k)
    }
  }
  keys.sort(sorter)
const iniVal = (typeofrequire !== 'undefined' ? require('../info/ini_get')('locutus.sortByReference') : undefined) || 'on'
  sortByReference = iniVal === 'on'
  populateArr = sortByReference ? inputArr : populateArr
// Rebuild array with sorted key names
for (i = 0; i < keys.length; i++) {
    k = keys[i]
    tmpArr[k] = inputArr[k]
if (sortByReference) {
delete inputArr[k]
    }
  }
for (i in tmpArr) {
if (tmpArr.hasOwnProperty(i)) {
      populateArr[i] = tmpArr[i]
    }
  }
return sortByReference || populateArr
}