@peeja Haven't tested but there is a commit React 16 support anmonteiro committed on Sep 29

@peeja FYI when I ported Fulcro away from Om Next, I noticed that that code is broken under adv opt

It is trying to track “mounted” status…using the lifecycle hooks via the defui wrapping works better.

If anyone wanted to back-port the fix, it is here: https://github.com/fulcrologic/fulcro/blob/v2.0.0-beta5/src/main/fulcro/client/primitives.cljc#L396 Just look for anything related to fulcro$mounted…should be fairly easy. Remove the stuff in Om next about react fibre and such for this same concern.