Derby.js Pass env var to the client

client.js

// Somewhere in the /lib/app

derby = require('derby');
app = require('./index.js');

if(derby.util.isServer) {
  fnEval = "(function(){"
           + "return function() {"
             + "window.NODE_ENV = \'" + (process.env.NODE_ENV || 'development') + "\';"
             + "window.APP = \'"      + (process.env.APP      || 'myapp')       + "\';"
           + "};"   
         + "})()";
  app.view.inline( eval(fnEval) );
}