0.9.1-alpha.6

Patch Changes

• d8783d7: Add the shared hooks: useControllableState, usePressState, useMergedRef and usePrevious.

  useControllableState gives a component one state that works whether the caller drives it or not, so there are never two code paths for the same value. Its setter keeps its identity across renders and reads the current value from a ref, which is what lets a handler built on it be passed to a memoized child. Switching between the two modes mid-life warns in development — it is always a bug, and invisible without it.

  usePressState is the press state a root owns, with handlers that compose the caller's rather than replacing them and keep their identity across renders. Every pressable component needs those three properties and gets one of them wrong on its own.

  useMergedRef memoizes mergeRefs on the refs it was given, so React does not detach and reattach every one of them — and pay for a node measurement — on each render.