Writing JS for both Node & Browser

browser.html

<script src="mymodule.js"></script>
<script>
    alert(mymodule.test());
</script>

mymodule.js

(function(){

  // your code goes here
  
  function notExported(){
    return "shh, I'm not here";
  }

  function test(){
    return 'hello world';
  };
  
  if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
    module.exports = test; // default
    // module.exports.otherExport = otherExport;
  }
  else {
    window.test = test;
    // module.exports.otherExport = otherExport;
  }

})();

node.js

var mymodule = require('./mymodule'),
    sys = require('sys');

sys.puts(mymodule.test());