Henry

Would be nice to include node in https://github.com/babel/babel-preset-env, we should ask all the node-x, w.e presets to help out. This is new but you can use the `latest` preset instead...

Right `babel-core` is already a dependency in `babel-cli`, it's not necessary (only when using babel-loader since it's a peerDep in that case).

We could throw if `context.env()` is not what is expected or undefined in the plugins themselves? Or just warn

I think we're confusing the terms here? Since not everyone understands how it all works, yes we need to modify the parser and would have to make the same changes...