dillon1000/react

useRef: Warn about reading or writing mutable values during render (#18545)

Reading or writing a ref value during render is only safe if you are implementing the lazy initialization pattern.

Other types of reading are unsafe as the ref is a mutable source.

Other types of writing are unsafe as they are effectively side effects.

This change also refactors useTransition to no longer use a ref hook, but instead manage its own (stable) hook state.