How to contribute to CoffeeScript

Before you open a ticket or send a pull request, search for previous discussions about the same feature or issue. Add to the earlier ticket if you find one.
Before sending a pull request for a feature, be sure to have tests.
Use the same coding style as the rest of the codebase. If you’re just getting started with CoffeeScript, there’s a nice style guide.
In your pull request, do not add documentation to index.html or re-build the minified coffeescript.js file. We’ll do those things before cutting a new release. You should, however, commit the updated compiled JavaScript files in lib.
To get started, read the guides in the wiki:

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