That looks cool, actually sketch open format is one of the reason to choose Sketch over other tools. Our developer also managed to export styles directly into code (something like stylesync is trying to do). But it’s still only one-direction sync and it requires cleaning up the code. So it’s not like you can connect Sketch Component to React Component and wherever you change one of them, other changes as well. That’s a dream I have :-)
Lona seems interesting though! Will give give it a try!

Leading Product Design team at Payoneer Germany