PHP's max in JavaScript

module.exports = functionmax () {
//  discuss at: https://locutus.io/php/max/
// original by: Onno Marsman (https://twitter.com/onnomarsman)
//  revised by: Onno Marsman (https://twitter.com/onnomarsman)
// improved by: Jack
//      note 1: Long code cause we're aiming for maximum PHP compatibility
//   example 1: max(1, 3, 5, 6, 7)
//   returns 1: 7
//   example 2: max([2, 4, 5])
//   returns 2: 5
//   example 3: max(0, 'hello')
//   returns 3: 0
//   example 4: max('hello', 0)
//   returns 4: 'hello'
//   example 5: max(-1, 'hello')
//   returns 5: 'hello'
//   example 6: max([2, 4, 8], [2, 5, 7])
//   returns 6: [2, 5, 7]
let ar
let retVal
let i = 0
let n = 0
const argv = arguments
const argc = argv.length
const _obj2Array = function (obj) {
if (Object.prototype.toString.call(obj) === '[object Array]') {
return obj
    } else {
const ar = []
for (const i in obj) {
if (obj.hasOwnProperty(i)) {
          ar.push(obj[i])
        }
      }
return ar
    }
  }
var _compare = function (current, next) {
let i = 0
let n = 0
let tmp = 0
let nl = 0
let cl = 0
if (current === next) {
return0
    } elseif (typeof current === 'object') {
if (typeof next === 'object') {
        current = _obj2Array(current)
        next = _obj2Array(next)
        cl = current.length
        nl = next.length
if (nl > cl) {
return1
        } elseif (nl < cl) {
return-1
        }
for (i = 0, n = cl; i < n; ++i) {
          tmp = _compare(current[i], next[i])
if (tmp === 1) {
return1
          } elseif (tmp === -1) {
return-1
          }
        }
return0
      }
return-1
    } elseif (typeof next === 'object') {
return1
    } elseif (isNaN(next) && !isNaN(current)) {
if (current === 0) {
return0
      }
return (current < 0 ? 1 : -1)
    } elseif (isNaN(current) && !isNaN(next)) {
if (next === 0) {
return0
      }
return (next > 0 ? 1 : -1)
    }
if (next === current) {
return0
    }
return (next > current ? 1 : -1)
  }
if (argc === 0) {
thrownewError('At least one value should be passed to max()')
  } elseif (argc === 1) {
if (typeof argv[0] === 'object') {
      ar = _obj2Array(argv[0])
    } else {
thrownewError('Wrong parameter count for max()')
    }
if (ar.length === 0) {
thrownewError('Array must contain at least one element for max()')
    }
  } else {
    ar = argv
  }
  retVal = ar[0]
for (i = 1, n = ar.length; i < n; ++i) {
if (_compare(retVal, ar[i]) === 1) {
      retVal = ar[i]
    }
  }
return retVal
}