autoloader.js

exports.AutoLoader = function() {};
AutoLoader.prototype.autoload = function(type, filePath, includeAsType) {
  var obj = undefined;
  if(includeAsType === undefined) includeAsType = true;
 
  this.__defineGetter__(type, function(){
    if(!obj){
      obj = require(filePath);
      if(includeAsType) obj = obj[type];
    }
    return obj;
  });
};

myObj.js

exports.MyObj = {
  hi : "there"
}

node.js

var paths = require("path"),
AutoLoader = require("./autoloader").AutoLoader;

var foo = new AutoLoader();
foo.autoload("MyObj", paths.join(__dirname, "myObj"));

sys.puts(foo.MyObj);