//файл /application.js
include('module1/myFile.js');
include('module2/anotherFile.js');
include('module3/script.js');

function implementation(){
  // тут сама реализация модуля
}


//файл /module1/myFile.js
include('helper.js') //загрузка файла /module1/helper.js

function implementation(){
  // тут сама реализация вспомогательного функционала
}

include('configs.js', true); //аналог include_once
include('myfile1.js');
include('myfile2.js');
include('myfile3.js');

implementation(){
  //код
}

require(["configs", "myfile1", "myfile2", "myfile3"], function(configs, myfile1, myfile2, myfile3) {
});

/*****************************************
 * Реализация include начало             *
 *****************************************/
function Loader(){
  // this._ - создание функции с автовалидацией переданных аргументов
  this._(['String', ['Loader', null]], function init(path, parent){
    this.ext(TObject, []);
    this.parent = parent || null;
    this.includes = [];
    var pathElement = path.split('/');
    pathElement.pop();
    this.fileName = path;
    this.path = pathElement.join('/')+'/';
    this.waitFinish = false;
  });
  
  this._(['String', ['Boolean', false]], function include(path, once){
    var el = new Loader(this.path+path, this);
    el.once = once;
    this.includes.push(el);
    (function(el){
      window.loadFile(el.fileName, function(src){
        var hash = src.hashCode(); //функция hashCode определена немного ранее. Аналог хэша в java
        if (!el.once || typeof(window.__loader.hash[hash])==='undefined'){
          window.__loader.hash[hash] = 1;
          el.evaluate(src);
        }
        if(el.includes.length==0){
          el.waitFinish = true;
          if(el.parent!=null)
            el.parent.tryFinish();
        }
      });
    })(el);
  });
  
  this._([], function tryFinish(){
    if(this.includes[0].waitFinish==true){
      if(this.includes[0].implementation)
        this.includes[0].implementation.call(window);
      this.includes.shift();
    }
    if(this.includes.length==0){
      this.waitFinish = true;
      if(this.parent!=null)
        this.parent.tryFinish();
    }
  });
  
  this._(['String'], function evaluate(src){
    var include = this.include;
    var __fileName__ = this.fileName;
    eval(src);
    this.implementation=implementation;
  });
  
  this.init.apply(this, arguments);
}

window.__loader = new Loader('');
window.__loader.hash = [];

/*****************************************
 * Реализация include конец              *
 *****************************************/