Flow bakes React libdefs right into the binary https://github.com/facebook/flow/blob/master/lib/react.js https://github.com/facebook/flow/blob/master/lib/react.

Flow bakes React libdefs right into the binary https://github.com/facebook/flow/blob/master/lib/react.js https://github.com/facebook/flow/blob/master/lib/react.js - so yes, Flow damn well have good React support, because the React libdef is given the same level of importance as Node and DOM APIs. Of course it also means you can't upgrade React without upgrading Flow, and you can't target a specific (older) version of React without downgrading Flow.