chore(deps): update react-router to v8.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@react-router/dev (source)	8.3.1 → 8.4.0
react-router (source)	8.3.1 → 8.4.0

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Release Notes

remix-run/react-router (@​react-router/dev)

v8.4.0

Compare Source

Patch Changes

• Fix action submissions behind an HTTPS reverse proxy in react-router dev and vite preview by using X-Forwarded-Proto when constructing request.url (#​15466)
  • No React Router configuration is required
  • The URL host continues to come from Host, not X-Forwarded-Host
  • Configure reverse proxies to overwrite client-supplied X-Forwarded-Proto headers
  • Do not expose dev or preview servers publicly
• Pass development conditions as CLI flags when relaunching the dev process (#​15435)
• Fix stack trace locations for split route modules when source maps are enabled in the reactRouter Vite plugin (#​15440)
• Updated dependencies:
  • react-router@8.4.0
  • @react-router/node@8.4.0
  • @react-router/serve@8.4.0

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

v8.4.0

Compare Source

Minor Changes

• Deprecate the createStaticRouter({ branches }) option (#​15297)
  • createStaticRouter now caches route branches internally, ignores branches, and logs a deprecation warning when the option is provided
  • The deprecated EntryContext.branches property remains available for compatibility but is always an empty array

Patch Changes

• Prevent stale route discovery during manifest version-mismatch recovery (#​15489)
  • Keep concurrent manifest responses pending while a document reload is in progress
  • Report a discovery error when a previous reload failed to resolve a version mismatch instead of loading a stale route or reloading repeatedly
  • Fail pending requests if a document reload does not complete within five seconds or the document is restored from the back-forward cache, allowing subsequent requests to recover
• Preserve lazy route module import errors during SPA navigations instead of replacing them with a missing dataStrategy result error (#​15464)
• Switch to more granular internal router contexts to avoid unnecessary route component re-renders when unrelated data router state changes (#​15376)
  • ⚠️ This contains some breaking changes to exported UNSAFE_ contexts, so please review carefully if you are using those unsafe exports
• Correctly escape streamed RSC redirect locations in meta tag attributes (#​15491)
• Avoid unintended document.startViewTransition calls during initial hydration and router.revalidate() calls (#​15484)
• Fix SingleFetchNoResultError thrown when a fetcher revalidates against a splat route during lazy route discovery (#​15395)
  • Track discovery per fetcher load so revalidation waits for the current load's discovery, even when the fetcher key is reused, while still restarting interrupted loaders after discovery completes
• Preserve the underlying decode failure as the cause of the Unable to decode turbo-stream response error (#​15450)

Unstable Changes

⚠️ Unstable features are not recommended for production use

• Add a Data Mode future.unstable_routePatternMatching flag for more efficient route matching powered by @remix-run/route-pattern (#​15298)
  • Add an unstable_validateParams route field to reject invalid parameter values and continue matching
• Document access control requirements for RSC Server Functions (#​15490)
  • Treat every Server Function as a public endpoint that must perform all of its own access control checks
  • Recommend route actions when access control should be provided by route middleware

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