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This used to be trivial but it's no longer trivial. In Fizz and Fiber this is split into renderWithHooks and finishFunctionComponent since they also support indeterminate components. Interestingly thanks to this unification we always call functions with an arity of 2 which is a bit weird - with the second argument being undefined in everything except forwardRef and legacy context consumers. This makes Flight makes the same thing but we could also call it with an arity of 1. Since Flight errors early if you try to pass it a ref, and there's no legacy context, the second arg is always undefined. The practical change in this PR is that returning a Promise from a forwardRef now turns it into a lazy. We previously didn't support async forwardRef since it wasn't supported on the client. However, since eventually this will be supported by child-as-a-promise it seems fine to support it.
react-server
This is an experimental package for creating custom React streaming server renderers.
Its API is not as stable as that of React, React Native, or React DOM, and does not follow the common versioning scheme.
Use it at your own risk.