Looks like they haven't put up much documentation yet - hard to say what this is really.
How do you work with different platforms? How does the performance compare to React Native? Can we see examples? What APIs exist to access native functionalities? How complete is the Flex implementation?
How do you work with different platforms? How does the performance compare to React Native? Can we see examples? What APIs exist to access native functionalities? How complete is the Flex implementation?