i assume you work on the team at FB. Are you considering writing jsx compilers for platforms like the jvm?
Our approach is going to make js interop performant with our stack (which is not jvm). We don't have a concrete plan at this time. You would need more than jsx to make this work through (jsx is just sugar)
I suppose Rhino can also be used? :)
we use rhino for some types of testing. brutally slow.