main.js

/**
 * Require root module
 */
define(function (require, exports, module) {
    "use strict";

    var ModuleA      = require("packageA/moduleA"),
        ModuleB      = require("./packageB/moduleB");
    
    console.log("Modules loaded:", ModuleA, ModuleB);
    
    // Type "ModuleA." or "ModuleB." here:
    
});

moduleA.js

/**
 * Sample module A - place this in 'packageA' subfolder!
 */
define(function (require, exports, module) {
    "use strict";
    
    function foo(x) {
        return Math.sqrt(x);
    }
    
    exports.foo = foo;
});

moduleB.js

/**
 * Sample module B - place this in 'packageB' subfolder!
 */
define(function (require, exports, module) {
    "use strict";
    
    function bar(x) {
        return x + " bar!";
    }
    
    exports.bar = bar;
});

This is not working with node modules
eg: var express = require('express')();
app.use --> there is no autocomplete here!!!