Code completion for passed objects

I have been using Komodo Edit for some time and it’s code completion has improved a lot since previous version. One place where I don’t get completion is when passing object as argument. For example, in following node js code I get code completion for http object but for request and response I don’t get code completion. Am I missing something or it isn’t possible?

var http = require("http");

http.createServer(function(req, res){

This is not possible. The “type” of req and res cannot be inferred by Komodo, as they are arguments to a function, and not return values.