start it with : node main.js

main.js

var config = {
    loadDir: {
        base: __dirname + '/',
        dirs: [ 'modules/' ]
    }
};

require('yui3').YUI( config ).use('loader', 'dump', function(Y) {
    Y.log("app starts", 'info');
        
    Y.use('module1', function(Y){
        Y.log("callback", 'info');
        Y.log( Y.dump(new Y.Module1()), 'info');
    });
    
});

module1.js

/* this file goes into modules folder at same location as main.js */

YUI.add('module1', function(Y) {
    
var Module1 = function() {
    Y.log("Module created !", 'info', Module1.PACKAGE);
};

Module1.NAME = "Module1";
Module1.PACKAGE = "Module1";

Y.namespace().Module1 = Module1;

Y.log("module load finished", 'info', Module1.PACKAGE);
console.log("inner model1");

}, '0.1', { requires: [ 'oop' ] });

console.log("loading module1 " + new Date());