Commits on Jan 25, 2024

1. Async action support for React.startTransition …

   This adds support for async actions to the "isomorphic" version of
   startTransition (i.e. the one exported by the "react" package).
   Previously, async actions were only supported by the startTransition
   that is returned from the useTransition hook.
   
   The interesting part about the isomorphic startTransition is that it's
   not associated with any particular root. It must work with updates to
   arbitrary roots, or even arbitrary React renderers in the same app. (For
   example, both React DOM and React Three Fiber.)
   
   The idea is that React.startTransition should behave as if every root
   had an implicit useTransition hook, and you composed together all the
   startTransitions provided by those hooks. Multiple updates to the same
   root will be batched together. However, updates to one root will not be
   batched with updates to other roots.
   
   Features like useOptimistic work the same as with the hook version.
   
   There is one difference from from the hook version of startTransition:
   an error triggered inside an async action cannot be captured by an error
   boundary, because it's not associated with any particular part of the
   tree. You should handle errors the same way you would in a regular
   event, e.g. with a global error event handler, or with a
   local `try/catch`.

   

   acdlite committed Jan 25, 2024
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