--bare by default in nodejs

Is it possible to switch `--bare` on by default when the runtime environment is nodejs? I've build a [module](https://github.com/jhnns/rewire) for dependency injection to inject mocks. But rewire() can only change variables in the top-scope of the module which doesn't work when the cs-compiler is wrapping the code (jhnns/rewire#8).

There is no need for wrapping the code in node. :wink: 
