Get current response type in helper (Cake 2.0-dev)

hello.

i'm refactoring my Helpers to comply with Cake 2.0

i'm having problem with my TidyHelper.
As stated by his name this helper uses Tidy to clean up the output
HTML.
The problem comes when my app renders a PDF, a CSV or any document !=
"text/html".

so... is there a way to get CakeResponse::type() in helper, other than
brutally, manually, load that class?

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