[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
react-router (source)	^8.4.0 → ^8.5.0

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Release Notes

remix-run/react-router (react-router)

v8.5.0

Compare Source

Minor Changes

• Deprecate React Router's view transition APIs in favor of React's <ViewTransition> component, available in React 19.3 and later (#​15493)
  • Deprecate the viewTransition props/options, useViewTransitionState, and NavLink's isTransitioning render prop and transitioning class
  • Preserve existing behavior, including support for older React versions
  • See the migration guide for a navigation example and compatibility considerations

Patch Changes

• Fix <Await> failing to server render promises decoded from an RSC payload, which caused the Suspense boundary to switch to client rendering (#​15597)
• Declare @types/react and @types/react-dom as optional peer dependencies so the shipped type definitions resolve React types under strict (non-hoisted) node_modules layouts (#​15528)
• Fix the unstable_useRouterState documentation example to call the imported alias (#​15535)
• Render the HydrateFallback of a route discovered through patchRoutesOnNavigation during initial hydration (#​15537)
  • Routes discovered during initial hydration are now exposed in state.matches while their loaders run, so <RouterProvider> renders down to the discovered route's HydrateFallback instead of rendering nothing
• Fix router state recovery when updates occur before RouterProvider subscribes, including when other subscribers are already attached, and report current client errors once without replaying server errors during hydration (#​15637)
• Fix matchPath not treating a static segment as optional when it contains characters outside [\w-] (#​15425)
• Fix an RSC server crash when a client aborts a document request while the HTML stream waits for the RSC payload (#​15612)
• Stop revalidating a fetcher after fetcher.reset(), so its cleared data no longer comes back on the next revalidation (#​15633)

Unstable Changes

⚠️ Unstable features are not recommended for production use

• Add an unstable_fetch prop to <HydratedRouter> to customize JavaScript-issued manifest and server data requests in conventional Framework Mode (#​15586)
  • The function receives the intended request as well as context identifying the type of request
  • Data request context includes navigationType ("PUSH", "REPLACE", or "POP" for navigation-initiated requests, including reloaded fetchers; null otherwise)
    • Data strategies receive equivalent metadata through unstable_initiator and unstable_navigationType
  • The custom fetch context is a discriminated union, so narrowing type to "navigation" guarantees a non-null navigationType, while other data requests have a null navigationType
    • Fetchers reloaded after an initialization redirect retain the "initialization" type and include their fetcher key
  • Like other router initialization options, the implementation is captured when the singleton router is created and thus subsequent prop changes are ignored
  • Browser-managed data prefetches from <Link prefetch> use native <link rel="prefetch"> elements and do not call the custom implementation
  • Use the callback for custom fetch options, custom headers, safe request retries, or response header inspection
  • Return response bodies unchanged so React Router can decode its manifest and Turbo Stream data protocols
• Support API-only Framework Mode with runtime server data loading, actions, revalidation, and lazy route discovery (#​15601)
  • Hydrate prerendered pages from build-time data and fetch server loader data when hydrating a SPA fallback
  • Preserve normal loader revalidation and server-action support for eagerly loaded and lazily discovered routes, and honor loader opt-outs when making server data requests
• Add unstable_useRouteDiscovery for application-controlled route discovery in conventional Framework Mode (#​15602)
  • Discover selected destinations or load the running client's full route manifest without loading route modules
  • Compose manifest-mismatch handlers, with shared recovery and cancellation that preserves application state
  • Keep full-manifest failures catchable without rendering error boundaries, whether mismatch handlers use the hook or event's loadAllRoutes()
  • Cancel pending revalidation alongside a canceled navigation, retaining existing data and settling interrupted fetchers before restoring Back/Forward history
  • Enable future.unstable_customRouteDiscovery to opt in
    • Apps without the flag retain existing discovery behavior
  • Call event.defaultBehavior() from a custom mismatch handler to explicitly run built-in recovery
• Return middleware short-circuit responses as-is for document requests in RSC modes, including resource routes, instead of decoding non-RSC bodies as Flight (#​15628)
  • Include server middleware in both eager and lazy RSC route configuration types
  • Preserve HTML rendering for cached Flight responses returned by middleware, and pass through raw responses that replace the result of next()

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