How to build a module structure correctly?

Question

JavaScript

The task is to export the module with its functions (treeCatalog, catalogCreate in the future there will be more of them), these functions must return some variables (cate, result) generated by internal functions.
I tried to create a session separately when calling the function: unsuccessfully.
I suppose that you need to modify the internal Callback functions, push in which direction to dig

var MagentoAPI = require('magento');
var fs = require('fs');

var magento = new MagentoAPI({
  host: 'host.ru',
  port: 80,
  path: '/api/xmlrpc/',
  login: 'login',
  pass: 'pass'
});

// Открываем сессию получаем sessId
magento.login(function(err, sessId) {
  if (err) {
    console.log(err)    
    // deal with error
    return;
  }

//Получить список категорий
function treeCatalog (id){
 
magento.catalogCategory.tree({
  parentId:   id,  /* optional */
  
  //storeView:  1  /* optional */
}, function (err, result) {
if (err != null) {
  console.log(err)} 
  else{
     
     var cate = []

    for (i = 0; i < result.children.length; i++){
              var categor = {name:'', id:''}              
              categor.name = result.children[i].name
              categor.id = result.children[i].category_id
              cate.push (categor)
          }
        }
    });

}

//создать категорию
function catalogCreate (opt){

var catalogData = {
name: opt.name,
include_in_menu: 1,
available_sort_by: [1],
is_active: 1,
position: 1,
default_sort_by: 1,
}

magento.catalogCategory.create({
  categoryId: opt.id,
  data: catalogData,
 // storeView:  val   /* optional */
}, function (err, result) {
if (err != null) {
  console.log(err)} 
  else{    
   console.log("Catalog --" + '\n'+ result)
   }; 
});

}

});

Answer 1

More information here.

// mathModule.js
var mathModule = {};

mathModule.sum = function(a, b){
  return a + b;
};

module.exports = mathModule;

// app.js
var mathModule = require('./mathModule.js');

console.log(mathModule.sum(1,2));