ExtJS Lint?

There is a nice script for jquery called jQuery Lint.
http://github.com/jamespadolsey/jQue...jquery.lint.js

You can include this and get console output for all errors/warnings of your code. very nice for developing.
http://img11.imageshack.us/img11/986...0118140644.png

I would like to have a simular for ExtJS - what do you think?

Optional, add-in, runtime error checking of common mistakes is coming soon!

nice to hear :)