Design pattern for multiple file JavaScript library that can be used in browser and with node.js

I'm have written a library which primarily made to be used in the browser. Now I want to use this library with node.js too.

My library consists of multiple files like:

loremIpsum.core.js:

loremIpsum = {};

loremIpsum.a = function(){
   //Important code
}

loremIpsum.b = function(){
   //Important code
}

Then there are other files which are dependent on the loremIpsum because they have to use the a or b function. Like:

loremIpsum.dolor.js:

loremIpsum.dolor = loremIpsum.a(); 

loremIpsum.dolor.x = function(){
   //Important code
}

loremIpsum.dolor.y = function(){
   //Important code
}

I have no idea how I could use that code with node.js. When I would require the files like: (pretending I've assigned exports to loremIpsum) 

var loremIpsum = require("loremIpsum.core.js");
require("loremIpsum.dolor.js");

The problem is that loremIpsum.dolor.js would not work because loremIpsum is not defined.

I've read about some libraries and requireJS but I would prefer not to use such a library. Is there any good approach?

While writing the question I got an idea but I is it a good idea?

loremIpsum.core.js:

loremIpsum.dolor = loremIpsum.a(); 

loremIpsum.load = function(w){
    require("loremIpsum." + w + ".js")(this);
}

loremIpsum.dolor.x = function(){
   //Important code
}

loremIpsum.dolor.y = function(){
   //Important code
}

And loremIpsum.dolor.js:

var module = function(loremIpsum){
    loremIpsum.dolor = loremIpsum.a(); 

    loremIpsum.dolor.x = function(){
       //Important code
    }

    loremIpsum.dolor.y = function(){
       //Important code
    }
};

if(typeof loremIpsum !== "undefined") {
   module(loremIpsum)
}
exports = module;

And then in a node.js file:

var loremIpsum = require("loremIpsum.core.js");
loremIpsum.load("dolor");

I've found a solution. I don't know if there are any disadvantages of it but it works quite well.

I've written about the solution on my blog: http://www.zujab.at/2014/09/pattern-for-a-multiple-file-javascript-library-for-the-browser-and-node-js/

The main code is:

The core file contains this method:

nowClean.load = function (lang){
    if(typeof require === 'undefined'){
        throw "nowClean.load may only be used with node.js";
    }
    var path = require('path');
    require(__dirname + path.sep + "nowClean." + lang + ".js")(this);
};

An "extension" file:

var nowCleanExt = function (nowClean){  

    nowClean.css = nowClean.create(function (code){
        /* ... */
    });

    /* ... */
};  

if(typeof nowClean !== 'undefined'){
    nowCleanExt(nowClean);
}
if(typeof module !== 'undefined'){
    module.exports = nowCleanExt;
}

And then in the node main script:

var nowClean = require("nowClean");
nowClean.load("css");