Document the formState option for hydrateRoot - #8633
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This adds the `formState` option to the `hydrateRoot` reference. The option carries the form state produced by a Server Function form submission so that `useActionState` with a `permalink` returns the submitted state during hydration instead of the initial state, and it must match the `formState` passed to the server renderer. The option shipped in React 19.0 but was never documented. Co-Authored-By: Claude Code (kimi-k3[1m]) <noreply@anthropic.com>
Size changesDetails📦 Next.js Bundle Analysis for react-devThis analysis was generated by the Next.js Bundle Analysis action. 🤖 This PR introduced no changes to the JavaScript bundle! 🙌 |
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Folded into #8632 since both touch formState. |
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Folded into #8632 |
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This adds the
formStateoption to thehydrateRootreference. The option carries the form state produced by a Server Function form submission so thatuseActionStatewith apermalinkreturns the submitted state during hydration instead of the initial state, and it must match theformStatepassed to the server renderer. The option shipped in React 19.0 but was never documented.Verified against
HydrateRootOptionsat react/react@f4e439e198 and the publishedreact-dom@19.2.8stable bundle, which already supports the option (so no Canary badge).