The biggest issue with Reason and Elm is that they don't support integration with arbitrary npm packages. That's the fastest way to gain adoption. If you are go

The biggest issue with Reason and Elm is that they don't support integration with arbitrary npm packages. That's the fastest way to gain adoption. If you are going to launch a new frontend language and you are not google, the quickest method is to have out of the box compiler support for the existing JS ecosystem.