I did that migration on a very large react project (hundreds of thousands of lines). As I recall, after dealing with warnings for the later 15.x releases, the u

I did that migration on a very large react project (hundreds of thousands of lines). As I recall, after dealing with warnings for the later 15.x releases, the upgrade was seamless. They're also good about creating codemods to make the transition easier -- something somewhat rare in the world of software libraries.