A javascript function to format javascript code

Does anyone know of a javascript library that will take a chunk of javascript source and format it according to 开发者_开发知识库some set of rules. I can of course do it in my editor but I would like to be able to automate it as part of a build process.

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Not in js, but maybe it could help:

• http://jsbeautifier.org/

(online and python version)