Commits on Sep 2, 2021

1. Initial shim of useSyncExternalStore …

   This sets up an initial shim implementation of useSyncExternalStore,
   via the use-sync-external-store package. It's designed to mimic the
   behavior of the built-in API, but is backwards compatible to any version
   of React that supports hooks.
   
   I have not yet implemented the built-in API, but once it exists, the
   use-sync-external-store package will always prefer that one. Library
   authors can depend on the shim and trust that their users get the
   correct implementation.
   
   See reactwg/react-18#86 for background
   on the API.
   
   The tests I've added here are designed to run against both the shim and
   built-in implementation, using our variant test flag feature. Tests that
   only apply to concurrent roots will live in a separate suite.

   

   acdlite committed Sep 2, 2021
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