node.js - How to create extension of nodejs framework keystonejs -

i have learned how create nodejs module , how publish following this article. working on keystone , learned alot (creating models, templates, adding relationships etc.).

now want extend functionality , create extension framework can used separately using npm (including keystone features well). don't know how extend , declare extension. can body provide tutorial or article on it?

i have gone through following articles didn't find help.

http://syskall.com/how-to-write-your-own-native-nodejs-extension

is possible write node.js extension in c (not c++)?