gistfile1.txt

let factorial : int -> int = fun num ->
     let rec helper : int -> int -> int = fun n acc ->
          if n > 0
          then helper (n-1) (acc * n)
          else acc
     in
          helper num 1
;;

gistfile2.txt

// Generated by BUCKLESCRIPT VERSION 3.2.0, PLEASE EDIT WITH CARE
'use strict';

var Caml_int32 = require("./stdlib/caml_int32.js");

function factorial(num) {
  var _n = num;
  var _acc = 1;
  while(true) {
    var acc = _acc;
    var n = _n;
    if (n > 0) {
      _acc = Caml_int32.imul(acc, n);
      _n = n - 1 | 0;
      continue ;
    } else {
      return acc;
    }
  };
}

exports.factorial = factorial;
/* No side effect */