I don't know much about this, but do you mean http://code.google.com/p/closure-compiler/source/browse/trunk/contrib/externs http://code.google.com/p/closure-com

I don't know much about this, but do you mean http://code.google.com/p/closure-compiler/source/browse/trunk/contrib/externs http://code.google.com/p/closure-compiler/source/browse/trun... ? That suggests that it will be available at some point, at least...