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feat: support React 19.2 #638

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feat: support React 19.2 #638

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@CodyJasonBennett CodyJasonBennett commented Nov 30, 2025

Mirrors pmndrs/react-three-fiber#3606.

Updates the reconciler to support React 19.2, including <Activity /> and useEffectEvent().

Because react-reconciler is published in lockstep with the React package, it is not seen as forwards compatible since React 19 and supports 19.2+.

We bundle react-reconciler for the moment since we are sure these features are forward compatible and do not present a breaking change. React packages inline the reconciler as well, but we have to ship both the development and production bundles.

@CodyJasonBennett CodyJasonBennett marked this pull request as draft November 30, 2025 19:24
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