How can I use option “–bare” in Rails 3.1 for CoffeeScript?

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I’d recommend against doing this. See my answer at Pattern for CoffeeScript modules for some of the reasons why. (“Making your CoffeeScript code incompatible with out-of-the-box Rails 3.1” is yet another reason.) Better to just use

window.a = b

or even

@a = b

instead of a = b when you’re trying to export something to global scope.

In previous versions of Rails 3.1, bare compilation was enabled. This was classified as a bug, and fixed in RC1.

So while I strongly encourage you not to do this, here’s how to turn bare compilation back on: Add

Tilt::CoffeeScriptTemplate.default_bare = true

to your environment.rb.

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