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CoffeeScript (http://coffeescript.org) is a language that to compiles down to JavaScript.

Starting with version 5.4, Tapestry can automatically compile your CoffeeScript code into JavaScript on the fly. This is done with the optional tapestry-webresources module. It is highly recommended for anyone who wants to use CoffeeScript in their application ... just let Tapestry do the compilation at runtime (with access to Tapestry's full exception reporting capabilities).

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All of Tapestry's own client-side code in is written in CoffeeScript and compiled, at build- time, to JavaScript.

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