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Andrew Clark
85b296e9b6
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`.