[nodejs] accessing a variable in a function that is exported from a module (using mapletree routing module)

[josh]

I have a variable in server.js. how to access it from within a function 
that is exported from a module? 
I use mapletree as my routes library that provide me define function -

var usersCollections = {};
router.define( '/user', require('./routes/user.js') 

//routes/user.js

module.exports = user;

function user (req, res) {
  console.log('collection', usersCollection); // not defined
  return res.end();
};

http://pastebin.com/SLHM85Xt

here is the complete project - 
https://github.com/oren/Y-U-NO-BIG

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