This is a nice idea in development and not so nice an idea in production, so please keep that in mind.
You will need to have to have Node.js installed with NPM and coffee-script.
You can follow the instructions in my previous article to install Node.js and then it's just
npm -g install coffee-script
Install Flask-Coffee with pip:
pip install flask-coffee
from flaskext.coffee import coffee coffee(app)
This will watch your app’s static media directory and automatically render .coffee files into .js files in the same (sub)directory.
The best way to incorporate Flask-Coffee into your development is as described for flask-lesscss in my earlier flask-script tutorial.
If you want to contribute email me at the email at http://pypi.python.org/pypi/Flask-Coffee after checking out the code at http://bettercodes.org/projects/flask-coffee.