# `react-router`

## v8.3.0

### Patch Changes

- Encode path params in `href`/`generatePath` per RFC 3986 path-segment rules instead of `encodeURIComponent` ([#15310](https://github.com/remix-run/react-router/pull/15310))
  - Characters that are valid literally in a path segment (`$ & + , ; = : @` — RFC 3986 `pchar`) are no longer percent-encoded, so values like a semver build `1.0.0+1` interpolate unchanged instead of becoming `1.0.0%2B1`
  - Structural/unsafe characters (`/ ? # %`, whitespace, non-ASCII) are still escaped exactly as before
- Use `crypto.randomUUID()` for `createMemorySessionStorage` session ids ([#15302](https://github.com/remix-run/react-router/pull/15302))
  - `createMemorySessionStorage` is only intended for local development and testing - sessions are lost when the server restarts
- Fix `NavLink` not applying its `pending` state when `to` has a trailing slash ([#15300](https://github.com/remix-run/react-router/pull/15300))
- Preserve RSC route component metadata so routes with a `clientLoader` can skip unnecessary server requests once their components have rendered while still fetching missing server-rendered elements ([#15323](https://github.com/remix-run/react-router/pull/15323))
- Harden RSC CSRF code paths ([#15311](https://github.com/remix-run/react-router/pull/15311))
- Fix server crash (`TypeError: Invalid state: Unable to enqueue`) when a request is aborted while the RSC HTML stream has a pending flush ([#15286](https://github.com/remix-run/react-router/pull/15286))
  - Handle cancellation of the `injectRSCPayload` readable side, clear the pending flush, and cancel the underlying RSC payload stream

### Unstable Changes

⚠️  _[Unstable features](https://reactrouter.com/community/api-development-strategy#unstable-flags) are not recommended for production use_

- Detect stale RSC clients during lazy route discovery and reload the destination document ([#15318](https://github.com/remix-run/react-router/pull/15318))

  #### Migration

  Apps using the default RSC Framework entry do not need to make any changes. Apps with a custom `entry.rsc.tsx` should import the generated client version and pass it to `unstable_matchRSCServerRequest`:

  ```tsx
  import clientVersion from "virtual:react-router/unstable_rsc/client-version";

  return unstable_matchRSCServerRequest({
    // ...
    clientVersion,
  });
  ```

- Add CSP nonce support to RSC document rendering ([#15320](https://github.com/remix-run/react-router/pull/15320))

  - Add `nonce` options to `unstable_routeRSCServerRequest` and `unstable_RSCStaticRouter`
  - Forward the nonce to the HTML renderer and apply it to injected RSC payload scripts and nonce-aware framework components

  To adopt nonce-based CSP, update your `entry.ssr.tsx` (run `react-router reveal entry.ssr` first in RSC Framework Mode) to generate a fresh nonce for each request. Pass it to `routeRSCServerRequest`, spread the `renderHTML` options into React's HTML renderer, pass `options.nonce` to `RSCStaticRouter`, and use the same nonce in the `Content-Security-Policy` response header:

  ```tsx
  const nonce = crypto.randomUUID();
  const response = await routeRSCServerRequest({
    request,
    serverResponse,
    createFromReadableStream,
    nonce,
    async renderHTML(getPayload, options) {
      const payload = getPayload();
      return renderHTMLToReadableStream(
        <RSCStaticRouter getPayload={getPayload} nonce={options.nonce} />,
        {
          ...options,
          bootstrapScriptContent,
          formState: await payload.formState,
          signal: request.signal,
        },
      );
    },
  });
  response.headers.set(
    "Content-Security-Policy",
    `script-src 'self' 'nonce-${nonce}'`,
  );
  ```

## v8.2.0

### Patch Changes

- Fix `href()` to properly stringify and URL-encode param values, matching `generatePath()` ([#15277](https://github.com/remix-run/react-router/pull/15277))
  - splat params preserve path separators while encoding each segment individually
- Fix dynamic param extraction for routes with optional static segments ([#15200](https://github.com/remix-run/react-router/pull/15200))
  - When a route path contains optional static segments (e.g. `/school?/user/:id`), the internal regex's incorrectly shifted parameter indices resulting in incorrect parameter extraction
  - Consecutive optional static segments (e.g. `/one?/two?`) were only partially handled
- Preserve navigation blocker state through a revalidation ([#15246](https://github.com/remix-run/react-router/pull/15246))
- Fix route ranking for dynamic parameters with static extension suffixes ([#15273](https://github.com/remix-run/react-router/pull/15273))
  - These were not being detected as dynamic param segments and instead got incorrectly scored higher as a static segment
  - This meant they could potentially tie truly static routes like `/sitemap.xml` and outrank them based on definition order
  - These are now correctly identified as dynamic parameter segments and scored correctly
- Use ReactFormState types instead of unknown ([#15263](https://github.com/remix-run/react-router/pull/15263))

## v8.1.0

### Minor Changes

- Return route metadata from server request, client navigation, and client fetcher instrumentations ([#15235](https://github.com/remix-run/react-router/pull/15235))
  - Adds result metadata after instrumented calls complete, including the URL, matched route pattern, and params
  - Adds known HTTP status codes to server request handler instrumentation results

## v8.0.1

### Patch Changes

- Remove the obsolete `AppLoadContext` type export accidentally left over from v7 now that middleware is always enabled and server request context is provided through `RouterContextProvider`. ([#15207](https://github.com/remix-run/react-router/pull/15207))

## v8.0.0

### Major Changes

- Remove the `future.v8_trailingSlashAwareDataRequests` flag ([#15100](https://github.com/remix-run/react-router/pull/15100))
  - Trailing slash-aware data request URLs are now the default behavior.
- Update `tsconfig.json` `target`/`lib` from `ES2020 -> ES2022` ([591853e](https://github.com/remix-run/react-router/commit/591853e))
- Switch the published packages in `packages/` to ESM-only. ([#14895](https://github.com/remix-run/react-router/pull/14895)) ([59ebcf1](https://github.com/remix-run/react-router/commit/59ebcf1))
- Remove deprecated `data` parameter in favor of `loaderData` for `meta` APIs (to align with `Route.ComponentProps`) ([#14931](https://github.com/remix-run/react-router/pull/14931))
  - `Route.MetaArgs`, `Route.MetaMatch`, `MetaArgs`, `MetaMatch`, `Route.ComponentProps.matches`, `UIMatch`
- Remove `future.v8_passThroughRequests` flag - the raw incoming `request` is now always passed through to `loader`/`action`. Use `url` for the normalized URL without React Router-specific implementation details (`.data` suffixes, `index`/`_routes` search params). ([#15079](https://github.com/remix-run/react-router/pull/15079))
- Remove internal `hasErrorBoundary` field added to `router.routes` when using a data router ([#15074](https://github.com/remix-run/react-router/pull/15074))
  - This should not impact user-facing code since this was an internal prop and was computed based on the presence of `ErrorBoundary` or `errorElement` on your route
  - `hasErrorBoundary` is no longer accepted on `RouteObject` (`IndexRouteObject`/`NonIndexRouteObject`), `DataRouteObject`, `<Route>` JSX props, or as a key in `lazy` route definitions.
  - The `MapRoutePropertiesFunction` signature no longer requires returning `hasErrorBoundary`; the router infers it directly.
- Remove `react-router-dom` package ([#15076](https://github.com/remix-run/react-router/pull/15076))
  - In v7 everything DOM-specific was collapsed into `react-router/dom`
    - `react-router-dom` was kept around as a convenience so existing v6 app imports would still work
  - For v8, you will need to swap `react-router-dom` imports:
    - `RouterProvider`/`HydratedRouter` should be imported from `react-router/dom`
    - Everything else should be imported from `react-router`
- Remove `future.v8_middleware` flag — middleware is always enabled in v8 ([#15078](https://github.com/remix-run/react-router/pull/15078))
  - The `future.v8_middleware` flag has been removed; middleware is now always enabled
  - The `context` parameter passed to `loader`, `action`, and `middleware` functions is always a `RouterContextProvider` instance
  - `getLoadContext` functions in custom servers must return a `RouterContextProvider` — returning a plain object is no longer supported
  - The `MiddlewareEnabled` type (previously exported as `UNSAFE_MiddlewareEnabled`) has been removed since the conditional it gated is now unconditional
  - The `Future` module augmentation pattern (`interface Future { v8_middleware: true }`) is no longer needed to type `context` in Data Mode
- Update minimum Node version to 22.22.0 ([#14928](https://github.com/remix-run/react-router/pull/14928))
- Update minimum React version to 19.2.7 ([#15062](https://github.com/remix-run/react-router/pull/15062))

### Minor Changes

- Bump dependencies ([#15080](https://github.com/remix-run/react-router/pull/15080))
  - Bumped `cookie` from `^1.0.1` to `^1.1.1`
  - Bumped `set-cookie-parser` from `^2.6.0` to `^3.1.0`

### Patch Changes

- Ensure client middleware errors load lazy route error boundaries before bubbling ([#15086](https://github.com/remix-run/react-router/pull/15086))
- Remove explicit `onSubmit` type override from `SharedFormProps` to fix deprecation warning with `@types/react@19.x` ([#14932](https://github.com/remix-run/react-router/pull/14932)) ([59ebcf1](https://github.com/remix-run/react-router/commit/59ebcf1))
- Update package builds to preserve individual module files in published artifacts. Public APIs and documented import paths are unchanged. ([#15092](https://github.com/remix-run/react-router/pull/15092))
  - Updated package TypeScript configs to support modern module syntax used by the build configuration.
- Migrate package builds from `tsup` to `tsdown`. Published package entry points and public APIs are unchanged. ([#15092](https://github.com/remix-run/react-router/pull/15092))
- Upgrade React Router's TypeScript tooling to TypeScript 6. Runtime behavior and public APIs are unchanged. ([#15092](https://github.com/remix-run/react-router/pull/15092))

## v7.18.0

### Patch Changes

- Fix server handler prerender responses when using `ssr: false` and `future.v8_trailingSlashAwareDataRequests: true`. Avoids false positive "SPA Mode" detection when serving prerendered paths ([#15173](https://github.com/remix-run/react-router/pull/15173))
- Use the `ServerRouter` nonce for nonce-aware SSR components when they don't provide their own value so strict CSP pages can load them. ([#15170](https://github.com/remix-run/react-router/pull/15170))
- Use `turbo-stream` to serialize and deserialize Framework Mode hydration errors ([#15175](https://github.com/remix-run/react-router/pull/15175))
- Precompute route branch matchers to avoid recompiling route path regexes during matching ([#15186](https://github.com/remix-run/react-router/pull/15186))
- Use the constructed request URL host when validating action request origins. ([#15185](https://github.com/remix-run/react-router/pull/15185))
- Remove the un-documented custom error serialization logic from Data Mode SSR built-in hydration flows ([#15175](https://github.com/remix-run/react-router/pull/15175))
- Validate protocols in RSC render redirects ([#15177](https://github.com/remix-run/react-router/pull/15177))
- Consolidate url normalization logic and better handle mixed slashes ([#15176](https://github.com/remix-run/react-router/pull/15176))

## v7.17.0

### Minor Changes

- Ship a subset of the official documentation inside the `react-router` package ([#15121](https://github.com/remix-run/react-router/pull/15121))
  - Markdown docs are now available in `node_modules/react-router/docs`, letting AI coding agents and the React Router agent skills read official docs locally
  - Excludes auto-generated API docs (`api/`), `community/` content, and tutorials (`tutorials/`)

## v7.16.0

### Minor Changes

- Stabilize `future.unstable_trailingSlashAwareDataRequests` as `future.v8_trailingSlashAwareDataRequests` ([#15098](https://github.com/remix-run/react-router/pull/15098))

### Patch Changes

- Disable manifest path when lazy route dicovery is disabled ([#15068](https://github.com/remix-run/react-router/pull/15068))

- Fix browser URL creation to use the configured history window instead of the global window. ([#15066](https://github.com/remix-run/react-router/pull/15066))
  - Pass the history/router window through to `createBrowserURLImpl` so custom window contexts keep the correct URL origin.

- Fix `useNavigation()` return type to preserve discriminated union across navigation states ([#15095](https://github.com/remix-run/react-router/pull/15095))

- Widen `MetaDescriptor` `script:ld+json` type from `LdJsonObject` to `LdJsonObject | LdJsonObject[]` to permit multiple JSON-LD schemas in a single `<script type="application/ld+json">` tag emitted by `<Meta />` ([#15082](https://github.com/remix-run/react-router/pull/15082))

## v7.15.1

### Patch Changes

- Update router to operate on fetcher Maps in an immutable manner to avoid delayed React renders from potentially reading an updated but not yet committed Map. This could result in brief flickers in some fetcher-driven optimistic UI scenarios. ([#15028](https://github.com/remix-run/react-router/pull/15028))
- Fix `serverLoader()` returning stale SSR data when a client navigation aborts pending hydration before the hydration `clientLoader` resolves ([#15022](https://github.com/remix-run/react-router/pull/15022))
- Fix `RouterProvider` `onError` callback not being called for synchronous initial loader errors in SPA mode ([#15039](https://github.com/remix-run/react-router/pull/15039)) ([#14942](https://github.com/remix-run/react-router/pull/14942))
- Memoize `useFetchers` to return a stable identity and only change if fetchers changed ([#15028](https://github.com/remix-run/react-router/pull/15028))
- Internal refactor to consolidate mutation request detection through shared utility ([#15033](https://github.com/remix-run/react-router/pull/15033))

### Unstable Changes

⚠️ _[Unstable features](https://reactrouter.com/community/api-development-strategy#unstable-flags) are not recommended for production use_

- Add a new `unstable_useRouterState()` hook that consolidates access to active and pending router states (RFC: #12358) ([#15017](https://github.com/remix-run/react-router/pull/15017))
  - Data/Framework/RSC only — throws when used without a data router
  - This should allow you to consolidate usages of the following hooks which will likely be deprecated and removed in a future major version
    - `useLocation`
    - `useSearchParams`
    - `useParams`
    - `useMatches`
    - `useNavigationType`
    - `useNavigation`

    ```ts
    let { active, pending } = unstable_useRouterState();

    // Active is always populated with the current location
    active.location; // replaces `useLocation()`
    active.searchParams; // replaces `useSearchParams()[0]`
    active.params; // replaces `useParams()`
    active.matches; // replaces `useMatches()`
    active.type; // replaces `useNavigationType()`

    // Pending is only populated during a navigation
    pending.location; // replaces `useNavigation().location`
    pending.searchParams; // equivalent to `new URLSearchParams(useNavigation().search)`
    pending.params; // Not directly accessible today
    pending.matches; // Not directly accessible today
    pending.type; // Not directly accessible today
    pending.state; // replaces `useNavigation().state`
    pending.formMethod; // replaces useNavigation().formMethod
    pending.formAction; // replaces useNavigation().formAction
    pending.formEncType; // replaces useNavigation().formEncType
    pending.formData; // replaces useNavigation().formData
    pending.json; // replaces useNavigation().json
    pending.text; // replaces useNavigation().text
    ```

## v7.15.0

### Minor Changes

- Stabilize `unstable_defaultShouldRevalidate` as `defaultShouldRevalidate` on `<Link>`, `<Form>`, `useLinkClickHandler`, `useSubmit`, `fetcher.submit`, and `setSearchParams` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Stabilize the instrumentation APIs. `unstable_instrumentations` is now `instrumentations` and `unstable_pattern` is now `pattern` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - The `unstable_ServerInstrumentation`, `unstable_ClientInstrumentation`, `unstable_InstrumentRequestHandlerFunction`, `unstable_InstrumentRouterFunction`, `unstable_InstrumentRouteFunction`, and `unstable_InstrumentationHandlerResult` types have had their `unstable_` prefixes removed
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Stabilize `unstable_mask` as `mask` on `<Link>`, `useLinkClickHandler`, and `useNavigate`, and rename the corresponding `Location.unstable_mask` field to `Location.mask` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Stabilize the `unstable_normalizePath` option on `staticHandler.query` and `staticHandler.queryRoute` as `normalizePath` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Stabilize `future.unstable_passThroughRequests` as `future.v8_passThroughRequests` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Remove `unstable_subResourceIntegrity` from the runtime `FutureConfig` type; the flag is now controlled by the top-level `subResourceIntegrity` option in `react-router.config.ts` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Stabilize `unstable_url` as `url` on `loader`, `action`, and `middleware` function args ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

- Stabilize `unstable_useTransitions` as `useTransitions` on `<BrowserRouter>`, `<HashRouter>`, `<HistoryRouter>`, `<MemoryRouter>`, `<Router>`, `<RouterProvider>`, `<HydratedRouter>`, and `useLinkClickHandler` ([a993f09](https://github.com/remix-run/react-router/commit/a993f09))
  - ⚠️ This is a breaking change if you have already opted into the unstable version - you will need to update your code accordingly

### Patch Changes

- Add `nonce` to `<Scripts>` `<link rel="modulepreload">` elements (if provided) ([af5d49b](https://github.com/remix-run/react-router/commit/af5d49b))

- Fix a bug with `unstable_defaultShouldRevalidate={false}` where parent routes that did not export a `shouldRevalidate` function could be incorrectly included in the single fetch call for new child route data ([#15012](https://github.com/remix-run/react-router/pull/15012))

- Improve server-side route matching performance by pre-computing flattened/cached route branches ([#14967](https://github.com/remix-run/react-router/pull/14967)) ([af5d49b](https://github.com/remix-run/react-router/commit/af5d49b))
  - Performance benchmarks showed roughly a 10-15% improvement in server-side request handling performance

- Mark `mask` as an optional field in `Location` for easier mocking in unit tests ([#14999](https://github.com/remix-run/react-router/pull/14999))

- Cache flattened/ranked route branches to optimize server-side route matching ([#14967](https://github.com/remix-run/react-router/pull/14967))

- Improve route matching performance in Framework/Data Mode ([#14971](https://github.com/remix-run/react-router/pull/14971)) ([af5d49b](https://github.com/remix-run/react-router/commit/af5d49b))
  - Avoiding unnecessary calls to `matchRoutes` in data router scenarios
    - This includes adding back the optimization that was removed in `7.6.0` ([#13562](https://github.com/remix-run/react-router/pull/13562))
    - The issues that prompted the revert have been addressed by using the available router `matches` but always updating `match.route` to the latest route in the `manifest`
  - Leverage pre-computed pre-computing flattened/cached route branches during client side route matching
  - Performance benchmarks showed roughly a 15-30% improvement in server-side request handling performance

## v7.14.2

### Patch Changes

- Remove the un-documented custom error serialization logic from the internal turbo-stream implementation. React Router only automatically handles serialization of `Error` and it's standard subtypes (`SyntaxError`, `TypeError`, etc.). ([[aabf4a1](https://github.com/remix-run/react-router/commit/aabf4a1))

- Properly handle parent middleware redirects during `fetcher.load` ([[aabf4a1](https://github.com/remix-run/react-router/commit/aabf4a1))

- Remove redundant `Omit<RouterProviderProps, "flushSync">` from `react-router/dom` `RouterProvider` ([[aabf4a1](https://github.com/remix-run/react-router/commit/aabf4a1))

- Improved types for `generatePath`'s `param` arg ([[aabf4a1](https://github.com/remix-run/react-router/commit/aabf4a1))

  Type errors when required params are omitted:

  ```ts
  // Before
  // Passes type checks, but throws at runtime 💥
  generatePath(":required", { required: null });

  // After
  generatePath(":required", { required: null });
  //                          ^^^^^^^^ Type 'null' is not assignable to type 'string'.ts(2322)
  ```

  Allow omission of optional params:

  ```ts
  // Before
  generatePath(":optional?", {});
  //                         ^^ Property 'optional' is missing in type '{}' but required in type '{ optional: string | null | undefined; }'.ts(2741)

  // After
  generatePath(":optional?", {});
  ```

  Allows extra keys:

  ```ts
  // Before
  generatePath(":a", { a: "1", b: "2" });
  //                           ^ Object literal may only specify known properties, and 'b' does not exist in type '{ a: string; }'.ts(2353)

  // After
  generatePath(":a", { a: "1", b: "2" });
  ```

## v7.14.1

### Patch Changes

- Fix a potential race condition that can occur when rendering a `HydrateFallback` and initial loaders land before the `router.subscribe` call happens in the `RouterProvider` layout effect
- Normalize double-slashes in redirect paths

## 7.14.0

### Patch Changes

- UNSTABLE RSC FRAMEWORK MODE BREAKING CHANGE - Existing route module exports remain unchanged from stable v7 non-RSC mode, but new exports are added for RSC mode. If you want to use RSC features, you will need to update your route modules to export the new annotations. ([#14901](https://github.com/remix-run/react-router/pull/14901))

  If you are using RSC framework mode currently, you will need to update your route modules to the new conventions. The following route module components have their own mutually exclusive server component counterparts:

  | Server Component Export | Client Component  |
  | ----------------------- | ----------------- |
  | `ServerComponent`       | `default`         |
  | `ServerErrorBoundary`   | `ErrorBoundary`   |
  | `ServerLayout`          | `Layout`          |
  | `ServerHydrateFallback` | `HydrateFallback` |

  If you were previously exporting a `ServerComponent`, your `ErrorBoundary`, `Layout`, and `HydrateFallback` were also server components. If you want to keep those as server components, you can rename them and prefix them with `Server`. If you were previously importing the implementations of those components from a client module, you can simply inline them.

  Example:

  Before

  ```tsx
  import { ErrorBoundary as ClientErrorBoundary } from "./client";

  export function ServerComponent() {
    // ...
  }

  export function ErrorBoundary() {
    return <ClientErrorBoundary />;
  }

  export function Layout() {
    // ...
  }

  export function HydrateFallback() {
    // ...
  }
  ```

  After

  ```tsx
  export function ServerComponent() {
    // ...
  }

  export function ErrorBoundary() {
    // previous implementation of ClientErrorBoundary, this is now a client component
  }

  export function ServerLayout() {
    // rename previous Layout export to ServerLayout to make it a server component
  }

  export function ServerHydrateFallback() {
    // rename previous HydrateFallback export to ServerHydrateFallback to make it a server component
  }
  ```

- rsc Link prefetch ([#14902](https://github.com/remix-run/react-router/pull/14902))

- Remove recursion from turbo-stream v2 allowing for encoding / decoding of massive payloads. ([#14838](https://github.com/remix-run/react-router/pull/14838))

- encodeViaTurboStream leaked memory via unremoved AbortSignal listener ([#14900](https://github.com/remix-run/react-router/pull/14900))

## 7.13.2

### Patch Changes

- Fix clientLoader.hydrate when an ancestor route is also hydrating a clientLoader ([#14835](https://github.com/remix-run/react-router/pull/14835))

- Fix type error when passing Framework Mode route components using `Route.ComponentProps` to `createRoutesStub` ([#14892](https://github.com/remix-run/react-router/pull/14892))

- Fix percent encoding in relative path navigation ([#14786](https://github.com/remix-run/react-router/pull/14786))

- Add `future.unstable_passThroughRequests` flag ([#14775](https://github.com/remix-run/react-router/pull/14775))

  By default, React Router normalizes the `request.url` passed to your `loader`, `action`, and `middleware` functions by removing React Router's internal implementation details (`.data` suffixes, `index` + `_routes` query params).

  Enabling this flag removes that normalization and passes the raw HTTP `request` instance to your handlers. This provides a few benefits:
  - Reduces server-side overhead by eliminating multiple `new Request()` calls on the critical path
  - Allows you to distinguish document from data requests in your handlers base don the presence of a `.data` suffix (useful for observability purposes)

  If you were previously relying on the normalization of `request.url`, you can switch to use the new sibling `unstable_url` parameter which contains a `URL` instance representing the normalized location:

  ```tsx
  // ❌ Before: you could assume there was no `.data` suffix in `request.url`
  export async function loader({ request }: Route.LoaderArgs) {
    let url = new URL(request.url);
    if (url.pathname === "/path") {
      // This check will fail with the flag enabled because the `.data` suffix will
      // exist on data requests
    }
  }

  // ✅ After: use `unstable_url` for normalized routing logic and `request.url`
  // for raw routing logic
  export async function loader({ request, unstable_url }: Route.LoaderArgs) {
    if (unstable_url.pathname === "/path") {
      // This will always have the `.data` suffix stripped
    }

    // And now you can distinguish between document versus data requests
    let isDataRequest = new URL(request.url).pathname.endsWith(".data");
  }
  ```

- Internal refactor to consolidate framework-agnostic/React-specific route type layers - no public API changes ([#14765](https://github.com/remix-run/react-router/pull/14765))

- Sync protocol validation to rsc flows ([#14882](https://github.com/remix-run/react-router/pull/14882))

- Add a new `unstable_url: URL` parameter to route handler methods (`loader`, `action`, `middleware`, etc.) representing the normalized URL the application is navigating to or fetching, with React Router implementation details removed (`.data`suffix, `index`/`_routes` query params) ([#14775](https://github.com/remix-run/react-router/pull/14775))

  This is being added alongside the new `future.unstable_passthroughRequests` future flag so that users still have a way to access the normalized URL when that flag is enabled and non-normalized `request`'s are being passed to your handlers. When adopting this flag, you will only need to start leveraging this new parameter if you are relying on the normalization of `request.url` in your application code.

  If you don't have the flag enabled, then `unstable_url` will match `request.url`.

## 7.13.1

### Patch Changes

- fix null reference exception in bad codepath leading to invalid route tree comparisons ([#14780](https://github.com/remix-run/react-router/pull/14780))

- fix: clear timeout when turbo-stream encoding completes ([#14810](https://github.com/remix-run/react-router/pull/14810))

- Improve error message when Origin header is invalid ([#14743](https://github.com/remix-run/react-router/pull/14743))

- Fix matchPath optional params matching without a "/" separator. ([#14689](https://github.com/remix-run/react-router/pull/14689))
  - matchPath("/users/:id?", "/usersblah") now returns null.
  - matchPath("/test_route/:part?", "/test_route_more") now returns null.

- add RSC unstable_getRequest ([#14758](https://github.com/remix-run/react-router/pull/14758))

- Fix `HydrateFallback` rendering during initial lazy route discovery with matching splat route ([#14740](https://github.com/remix-run/react-router/pull/14740))

- \[UNSTABLE] Add support for `<Link unstable_mask>` in Data Mode which allows users to navigate to a URL in the router but "mask" the URL displayed in the browser. This is useful for contextual routing usages such as displaying an image in a model on top of a gallery, but displaying a browser URL directly to the image that can be shared and loaded without the contextual gallery in the background. ([#14716](https://github.com/remix-run/react-router/pull/14716))

  ```tsx
  // routes/gallery.tsx
  export function clientLoader({ request }: Route.LoaderArgs) {
    let sp = new URL(request.url).searchParams;
    return {
      images: getImages(),
      // When the router location has the image param, load the modal data
      modalImage: sp.has("image") ? getImage(sp.get("image")!) : null,
    };
  }

  export default function Gallery({ loaderData }: Route.ComponentProps) {
    return (
      <>
        <GalleryGrid>
          {loaderData.images.map((image) => (
            <Link
              key={image.id}
              {/* Navigate the router to /galley?image=N */}}
              to={`/gallery?image=${image.id}`}
              {/* But display /images/N in the URL bar */}}
              unstable_mask={`/images/${image.id}`}
            >
              <img src={image.url} alt={image.alt} />
            </Link>
          ))}
        </GalleryGrid>

        {/* When the modal data exists, display the modal */}
        {data.modalImage ? (
          <dialog open>
            <img src={data.modalImage.url} alt={data.modalImage.alt} />
          </dialog>
        ) : null}
      </>
    );
  }
  ```

  Notes:
  - The masked location, if present, will be available on `useLocation().unstable_mask` so you can detect whether you are currently masked or not.
  - Masked URLs only work for SPA use cases, and will be removed from `history.state` during SSR.
  - This provides a first-class API to mask URLs in Data Mode to achieve the same behavior you could do in Declarative Mode via [manual `backgroundLocation` management](https://github.com/remix-run/react-router/tree/main/examples/modal).

- RSC: Update failed origin checks to return a 400 status and appropriate UI instead of a generic 500 ([#14755](https://github.com/remix-run/react-router/pull/14755))

- Preserve query parameters and hash on manifest version mismatch reload ([#14813](https://github.com/remix-run/react-router/pull/14813))

## 7.13.0

### Minor Changes

- Add `crossOrigin` prop to `Links` component ([#14687](https://github.com/remix-run/react-router/pull/14687))

### Patch Changes

- Fix double slash normalization for useNavigate colon urls ([#14718](https://github.com/remix-run/react-router/pull/14718))
- Update failed origin checks to return a 400 status instead of a 500 ([#14737](https://github.com/remix-run/react-router/pull/14737))
- Bugfix #14666: Inline criticalCss is missing nonce ([#14691](https://github.com/remix-run/react-router/pull/14691))
- Loosen `allowedActionOrigins` glob check so `**` matches all domains ([#14722](https://github.com/remix-run/react-router/pull/14722))

## 7.12.0

### Minor Changes

- Add additional layer of CSRF protection by rejecting submissions to UI routes from external origins. If you need to permit access to specific external origins, you can specify them in the `react-router.config.ts` config `allowedActionOrigins` field. ([#14708](https://github.com/remix-run/react-router/pull/14708))

### Patch Changes

- Fix `generatePath` when used with suffixed params (i.e., "/books/:id.json") ([#14269](https://github.com/remix-run/react-router/pull/14269))

- Export `UNSAFE_createMemoryHistory` and `UNSAFE_createHashHistory` alongside `UNSAFE_createBrowserHistory` for consistency. These are not intended to be used for new apps but intended to help apps usiong `unstable_HistoryRouter` migrate from v6->v7 so they can adopt the newer APIs. ([#14663](https://github.com/remix-run/react-router/pull/14663))

- Escape HTML in scroll restoration keys ([#14705](https://github.com/remix-run/react-router/pull/14705))

- Validate redirect locations ([#14706](https://github.com/remix-run/react-router/pull/14706))

- \[UNSTABLE] Pass `<Scripts nonce>` value through to the underlying `importmap` `script` tag when using `future.unstable_subResourceIntegrity` ([#14675](https://github.com/remix-run/react-router/pull/14675))

- \[UNSTABLE] Add a new `future.unstable_trailingSlashAwareDataRequests` flag to provide consistent behavior of `request.pathname` inside `middleware`, `loader`, and `action` functions on document and data requests when a trailing slash is present in the browser URL. ([#14644](https://github.com/remix-run/react-router/pull/14644))

  Currently, your HTTP and `request` pathnames would be as follows for `/a/b/c` and `/a/b/c/`

  | URL `/a/b/c` | **HTTP pathname** | **`request` pathname\`** |
  | ------------ | ----------------- | ------------------------ |
  | **Document** | `/a/b/c`          | `/a/b/c` ✅              |
  | **Data**     | `/a/b/c.data`     | `/a/b/c` ✅              |

  | URL `/a/b/c/` | **HTTP pathname** | **`request` pathname\`** |
  | ------------- | ----------------- | ------------------------ |
  | **Document**  | `/a/b/c/`         | `/a/b/c/` ✅             |
  | **Data**      | `/a/b/c.data`     | `/a/b/c` ⚠️              |

  With this flag enabled, these pathnames will be made consistent though a new `_.data` format for client-side `.data` requests:

  | URL `/a/b/c` | **HTTP pathname** | **`request` pathname\`** |
  | ------------ | ----------------- | ------------------------ |
  | **Document** | `/a/b/c`          | `/a/b/c` ✅              |
  | **Data**     | `/a/b/c.data`     | `/a/b/c` ✅              |

  | URL `/a/b/c/` | **HTTP pathname**  | **`request` pathname\`** |
  | ------------- | ------------------ | ------------------------ |
  | **Document**  | `/a/b/c/`          | `/a/b/c/` ✅             |
  | **Data**      | `/a/b/c/_.data` ⬅️ | `/a/b/c/` ✅             |

  This a bug fix but we are putting it behind an opt-in flag because it has the potential to be a "breaking bug fix" if you are relying on the URL format for any other application or caching logic.

  Enabling this flag also changes the format of client side `.data` requests from `/_root.data` to `/_.data` when navigating to `/` to align with the new format. This does not impact the `request` pathname which is still `/` in all cases.

- Preserve `clientLoader.hydrate=true` when using `<HydratedRouter unstable_instrumentations>` ([#14674](https://github.com/remix-run/react-router/pull/14674))

## 7.11.0

### Minor Changes

- Stabilize `<HydratedRouter onError>`/`<RouterProvider onError>` ([#14546](https://github.com/remix-run/react-router/pull/14546))

### Patch Changes

- add support for throwing redirect Response's at RSC render time ([#14596](https://github.com/remix-run/react-router/pull/14596))

- Support for throwing `data()` and Response from server component render phase. Response body is not serialized as async work is not allowed as error encoding phase. If you wish to transmit data to the boundary, throw `data()` instead. ([#14632](https://github.com/remix-run/react-router/pull/14632))

- Fix `unstable_useTransitions` prop on `<Router>` component to permit omission for backewards compatibility ([#14646](https://github.com/remix-run/react-router/pull/14646))

- `routeRSCServerRequest` replace `fetchServer` with `serverResponse` ([#14597](https://github.com/remix-run/react-router/pull/14597))

- \[UNSTABLE] Add a new `unstable_defaultShouldRevalidate` flag to various APIs to allow opt-ing out of standard revalidation behaviors. ([#14542](https://github.com/remix-run/react-router/pull/14542))

  If active routes include a `shouldRevalidate` function, then your value will be passed as `defaultShouldRevalidate` in those function so that the route always has the final revalidation determination.
  - `<Form method="post" unstable_defaultShouldRevalidate={false}>`
  - `submit(data, { method: "post", unstable_defaultShouldRevalidate: false })`
  - `<fetcher.Form method="post" unstable_defaultShouldRevalidate={false}>`
  - `fetcher.submit(data, { method: "post", unstable_defaultShouldRevalidate: false })`

  This is also available on non-submission APIs that may trigger revalidations due to changing search params:
  - `<Link to="/" unstable_defaultShouldRevalidate={false}>`
  - `navigate("/?foo=bar", { unstable_defaultShouldRevalidate: false })`
  - `setSearchParams(params, { unstable_defaultShouldRevalidate: false })`

- Allow redirects to be returned from client side middleware ([#14598](https://github.com/remix-run/react-router/pull/14598))

- Handle `dataStrategy` implementations that return insufficient result sets by adding errors for routes without any available result ([#14627](https://github.com/remix-run/react-router/pull/14627))

## 7.10.1

### Patch Changes

- Update the `useOptimistic` stub we provide for React 18 users to use a stable setter function to avoid potential `useEffect` loops - specifically when using `<Link viewTransition>` ([#14628](https://github.com/remix-run/react-router/pull/14628))

## 7.10.0

### Minor Changes

- Stabilize `fetcher.reset()` ([#14545](https://github.com/remix-run/react-router/pull/14545))
  - ⚠️ This is a breaking change if you have begun using `fetcher.unstable_reset()`

- Stabilize the `dataStrategy` `match.shouldRevalidateArgs`/`match.shouldCallHandler()` APIs. ([#14592](https://github.com/remix-run/react-router/pull/14592))
  - The `match.shouldLoad` API is now marked deprecated in favor of these more powerful alternatives

  - If you're using this API in a custom `dataStrategy` today, you can swap to the new API at your convenience:

    ```tsx
    // Before
    const matchesToLoad = matches.filter((m) => m.shouldLoad);

    // After
    const matchesToLoad = matches.filter((m) => m.shouldCallHandler());
    ```

  - `match.shouldRevalidateArgs` is the argument that will be passed to the route `shouldRevaliate` function

  - Combined with the parameter accepted by `match.shouldCallHandler`, you can define a custom revalidation behavior for your `dataStrategy`:

  ```tsx
  const matchesToLoad = matches.filter((m) => {
    const defaultShouldRevalidate = customRevalidationBehavior(
      match.shouldRevalidateArgs,
    );
    return m.shouldCallHandler(defaultShouldRevalidate);
    // The argument here will override the internal `defaultShouldRevalidate` value
  });
  ```

### Patch Changes

- Fix a Framework Mode bug where the `defaultShouldRevalidate` parameter to `shouldRevalidate` would not be correct after `action` returned a 4xx/5xx response (`true` when it should have been `false`) ([#14592](https://github.com/remix-run/react-router/pull/14592))
  - If your `shouldRevalidate` function relied on that parameter, you may have seen unintended revalidations

- Fix `fetcher.submit` failing with plain objects containing a `tagName` property ([#14534](https://github.com/remix-run/react-router/pull/14534))

- \[UNSTABLE] Add `unstable_pattern` to the parameters for client side `unstable_onError`, refactor how it's called by `RouterProvider` to avoid potential strict mode issues ([#14573](https://github.com/remix-run/react-router/pull/14573))

- Add new `unstable_useTransitions` flag to routers to give users control over the usage of [`React.startTransition`](https://react.dev/reference/react/startTransition) and [`React.useOptimistic`](https://react.dev/reference/react/useOptimistic). ([#14524](https://github.com/remix-run/react-router/pull/14524))
  - Framework Mode + Data Mode:
    - `<HydratedRouter unstable_transition>`/`<RouterProvider unstable_transition>`
    - When left unset (current default behavior)
      - Router state updates are wrapped in `React.startTransition`
      - ⚠️ This can lead to buggy behaviors if you are wrapping your own navigations/fetchers in `React.startTransition`
      - You should set the flag to `true` if you run into this scenario to get the enhanced `useOptimistic` behavior (requires React 19)
    - When set to `true`
      - Router state updates remain wrapped in `React.startTransition` (as they are without the flag)
      - `Link`/`Form` navigations will be wrapped in `React.startTransition`
      - A subset of router state info will be surfaced to the UI _during_ navigations via `React.useOptimistic` (i.e., `useNavigation()`, `useFetchers()`, etc.)
        - ⚠️ This is a React 19 API so you must also be React 19 to opt into this flag for Framework/Data Mode
    - When set to `false`
      - The router will not leverage `React.startTransition` or `React.useOptimistic` on any navigations or state changes
  - Declarative Mode
    - `<BrowserRouter unstable_useTransitions>`
    - When left unset
      - Router state updates are wrapped in `React.startTransition`
    - When set to `true`
      - Router state updates remain wrapped in `React.startTransition` (as they are without the flag)
      - `Link`/`Form` navigations will be wrapped in `React.startTransition`
    - When set to `false`
      - the router will not leverage `React.startTransition` on any navigations or state changes

- Fix the promise returned from `useNavigate` in Framework/Data Mode so that it properly tracks the duration of `popstate` navigations (i.e., `navigate(-1)`) ([#14524](https://github.com/remix-run/react-router/pull/14524))

- Fix internal type error in useRoute types that surfaces when skipLibCheck is disabled ([#14577](https://github.com/remix-run/react-router/pull/14577))

- Preserve `statusText` on the `ErrorResponse` instance when throwing `data()` from a route handler ([#14555](https://github.com/remix-run/react-router/pull/14555))

- Optimize href() to avoid backtracking regex on splat ([#14329](https://github.com/remix-run/react-router/pull/14329))

## 7.9.6

### Patch Changes

- \[UNSTABLE] Add `location`/`params` as arguments to client-side `unstable_onError` to permit enhanced error reporting. ([#14509](https://github.com/remix-run/react-router/pull/14509))

  ⚠️ This is a breaking change if you've already adopted `unstable_onError`. The second `errorInfo` parameter is now an object with `location` and `params`:

  ```tsx
  // Before
  function errorHandler(error: unknown, errorInfo?: React.errorInfo) {
    /*...*/
  }

  // After
  function errorHandler(
    error: unknown,
    info: {
      location: Location;
      params: Params;
      errorInfo?: React.ErrorInfo;
    },
  ) {
    /*...*/
  }
  ```

- Properly handle ancestor thrown middleware errors before `next()` on fetcher submissions ([#14517](https://github.com/remix-run/react-router/pull/14517))

- Fix issue with splat routes interfering with multiple calls to patchRoutesOnNavigation ([#14487](https://github.com/remix-run/react-router/pull/14487))

- Normalize double-slashes in `resolvePath` ([#14529](https://github.com/remix-run/react-router/pull/14529))

## 7.9.5

### Patch Changes

- Move RSCHydratedRouter and utils to `/dom` export. ([#14457](https://github.com/remix-run/react-router/pull/14457))

- useRoute: return type-safe `handle` ([#14462](https://github.com/remix-run/react-router/pull/14462))

  For example:

  ```ts
  // app/routes/admin.tsx
  const handle = { hello: "world" };
  ```

  ```ts
  // app/routes/some-other-route.tsx
  export default function Component() {
    const admin = useRoute("routes/admin");
    if (!admin) throw new Error("Not nested within 'routes/admin'");
    console.log(admin.handle);
    //                ^? { hello: string }
  }
  ```

- Ensure action handlers run for routes with middleware even if no loader is present ([#14443](https://github.com/remix-run/react-router/pull/14443))

- Add `unstable_instrumentations` API to allow users to add observablity to their apps by instrumenting route loaders, actions, middlewares, lazy, as well as server-side request handlers and client side navigations/fetches ([#14412](https://github.com/remix-run/react-router/pull/14412))
  - Framework Mode:
    - `entry.server.tsx`: `export const unstable_instrumentations = [...]`
    - `entry.client.tsx`: `<HydratedRouter unstable_instrumentations={[...]} />`
  - Data Mode
    - `createBrowserRouter(routes, { unstable_instrumentations: [...] })`

  This also adds a new `unstable_pattern` parameter to loaders/actions/middleware which contains the un-interpolated route pattern (i.e., `/blog/:slug`) which is useful for aggregating performance metrics by route

## 7.9.4

### Patch Changes

- handle external redirects in from server actions ([#14400](https://github.com/remix-run/react-router/pull/14400))
- New (unstable) `useRoute` hook for accessing data from specific routes ([#14407](https://github.com/remix-run/react-router/pull/14407))

  For example, let's say you have an `admin` route somewhere in your app and you want any child routes of `admin` to all have access to the `loaderData` and `actionData` from `admin.`

  ```tsx
  // app/routes/admin.tsx
  import { Outlet } from "react-router";

  export const loader = () => ({ message: "Hello, loader!" });

  export const action = () => ({ count: 1 });

  export default function Component() {
    return (
      <div>
        {/* ... */}
        <Outlet />
        {/* ... */}
      </div>
    );
  }
  ```

  You might even want to create a reusable widget that all of the routes nested under `admin` could use:

  ```tsx
  import { unstable_useRoute as useRoute } from "react-router";

  export function AdminWidget() {
    // How to get `message` and `count` from `admin` route?
  }
  ```

  In framework mode, `useRoute` knows all your app's routes and gives you TS errors when invalid route IDs are passed in:

  ```tsx
  export function AdminWidget() {
    const admin = useRoute("routes/dmin");
    //                      ^^^^^^^^^^^
  }
  ```

  `useRoute` returns `undefined` if the route is not part of the current page:

  ```tsx
  export function AdminWidget() {
    const admin = useRoute("routes/admin");
    if (!admin) {
      throw new Error(`AdminWidget used outside of "routes/admin"`);
    }
  }
  ```

  Note: the `root` route is the exception since it is guaranteed to be part of the current page.
  As a result, `useRoute` never returns `undefined` for `root`.

  `loaderData` and `actionData` are marked as optional since they could be accessed before the `action` is triggered or after the `loader` threw an error:

  ```tsx
  export function AdminWidget() {
    const admin = useRoute("routes/admin");
    if (!admin) {
      throw new Error(`AdminWidget used outside of "routes/admin"`);
    }
    const { loaderData, actionData } = admin;
    console.log(loaderData);
    //          ^? { message: string } | undefined
    console.log(actionData);
    //          ^? { count: number } | undefined
  }
  ```

  If instead of a specific route, you wanted access to the _current_ route's `loaderData` and `actionData`, you can call `useRoute` without arguments:

  ```tsx
  export function AdminWidget() {
    const currentRoute = useRoute();
    currentRoute.loaderData;
    currentRoute.actionData;
  }
  ```

  This usage is equivalent to calling `useLoaderData` and `useActionData`, but consolidates all route data access into one hook: `useRoute`.

  Note: when calling `useRoute()` (without a route ID), TS has no way to know which route is the current route.
  As a result, `loaderData` and `actionData` are typed as `unknown`.
  If you want more type-safety, you can either narrow the type yourself with something like `zod` or you can refactor your app to pass down typed props to your `AdminWidget`:

  ```tsx
  export function AdminWidget({
    message,
    count,
  }: {
    message: string;
    count: number;
  }) {
    /* ... */
  }
  ```

## 7.9.3

### Patch Changes

- Do not try to use `turbo-stream` to decode CDN errors that never reached the server ([#14385](https://github.com/remix-run/react-router/pull/14385))
  - We used to do this but lost this check with the adoption of single fetch

- Fix Data Mode regression causing a 404 during initial load in when `middleware` exists without any `loader` functions ([#14393](https://github.com/remix-run/react-router/pull/14393))

## 7.9.2

### Patch Changes

- - Update client-side router to run client `middleware` on initial load even if no loaders exist ([#14348](https://github.com/remix-run/react-router/pull/14348))
  - Update `createRoutesStub` to run route middleware
    - You will need to set the `<RoutesStub future={{ v8_middleware: true }} />` flag to enable the proper `context` type

- Update Lazy Route Discovery manifest requests to use a singular comma-separated `paths` query param instead of repeated `p` query params ([#14321](https://github.com/remix-run/react-router/pull/14321))
  - This is because Cloudflare has a hard limit of 100 URL search param key/value pairs when used as a key for caching purposes
  - If more that 100 paths were included, the cache key would be incomplete and could produce false-positive cache hits

- \[UNSTABLE] Add `fetcher.unstable_reset()` API ([#14206](https://github.com/remix-run/react-router/pull/14206))

- Made useOutlet element reference have stable identity in-between route chages ([#13382](https://github.com/remix-run/react-router/pull/13382))

- feat: enable full transition support for the rsc router ([#14362](https://github.com/remix-run/react-router/pull/14362))

- In RSC Data Mode, handle SSR'd client errors and re-try in the browser ([#14342](https://github.com/remix-run/react-router/pull/14342))

- Support `middleware` prop on `<Route>` for usage with a data router via `createRoutesFromElements` ([#14357](https://github.com/remix-run/react-router/pull/14357))

- Handle encoded question mark and hash characters in ancestor splat routes ([#14249](https://github.com/remix-run/react-router/pull/14249))

- Fail gracefully on manifest version mismatch logic if `sessionStorage` access is blocked ([#14335](https://github.com/remix-run/react-router/pull/14335))

## 7.9.1

### Patch Changes

- Fix internal `Future` interface naming from `middleware` -> `v8_middleware` ([#14327](https://github.com/remix-run/react-router/pull/14327))

## 7.9.0

### Minor Changes

- Stabilize middleware and context APIs. ([#14215](https://github.com/remix-run/react-router/pull/14215))

  We have removed the `unstable_` prefix from the following APIs and they are now considered stable and ready for production use:
  - [`RouterContextProvider`](https://reactrouter.com/api/utils/RouterContextProvider)
  - [`createContext`](https://reactrouter.com/api/utils/createContext)
  - `createBrowserRouter` [`getContext`](https://reactrouter.com/api/data-routers/createBrowserRouter#optsgetcontext) option
  - `<HydratedRouter>` [`getContext`](https://reactrouter.com/api/framework-routers/HydratedRouter#getcontext) prop

  Please see the [Middleware Docs](https://reactrouter.com/how-to/middleware), the [Middleware RFC](https://github.com/remix-run/remix/discussions/7642), and the [Client-side Context RFC](https://github.com/remix-run/react-router/discussions/9856) for more information.

### Patch Changes

- Escape HTML in `meta()` JSON-LD content ([#14316](https://github.com/remix-run/react-router/pull/14316))
- Add react-server Await component implementation ([#14261](https://github.com/remix-run/react-router/pull/14261))
- In RSC Data Mode when using a custom basename, fix hydration errors for routes that only have client loaders ([#14264](https://github.com/remix-run/react-router/pull/14264))
- Make `href` function available in a react-server context ([#14262](https://github.com/remix-run/react-router/pull/14262))
- decode each time `getPayload()` is called to allow for "in-context" decoding and hoisting of contextual assets ([#14248](https://github.com/remix-run/react-router/pull/14248))
- `href()` now correctly processes routes that have an extension after the parameter or are a single optional parameter. ([#13797](https://github.com/remix-run/react-router/pull/13797))

## 7.8.2

### Patch Changes

- \[UNSTABLE] Remove Data Mode `future.unstable_middleware` flag from `createBrowserRouter` ([#14213](https://github.com/remix-run/react-router/pull/14213))
  - This is only needed as a Framework Mode flag because of the route modules and the `getLoadContext` type behavior change
  - In Data Mode, it's an opt-in feature because it's just a new property on a route object, so there's no behavior changes that necessitate a flag

- \[UNSTABLE] Add `<RouterProvider unstable_onError>`/`<HydratedRouter unstable_onError>` prop for client side error reporting ([#14162](https://github.com/remix-run/react-router/pull/14162))

- server action revalidation opt out via $SKIP_REVALIDATION field ([#14154](https://github.com/remix-run/react-router/pull/14154))

- Properly escape interpolated param values in `generatePath()` ([#13530](https://github.com/remix-run/react-router/pull/13530))

- Maintain `ReadonlyMap` and `ReadonlySet` types in server response data. ([#13092](https://github.com/remix-run/react-router/pull/13092))

- \[UNSTABLE] Delay serialization of `.data` redirects to 202 responses until after middleware chain ([#14205](https://github.com/remix-run/react-router/pull/14205))

- Fix `TypeError` if you throw from `patchRoutesOnNavigation` when no partial matches exist ([#14198](https://github.com/remix-run/react-router/pull/14198))

- Fix `basename` usage without a leading slash in data routers ([#11671](https://github.com/remix-run/react-router/pull/11671))

- \[UNSTABLE] Update client middleware so it returns the data strategy results allowing for more advanced post-processing middleware ([#14151](https://github.com/remix-run/react-router/pull/14151))

## 7.8.1

### Patch Changes

- Fix usage of optional path segments in nested routes defined using absolute paths ([#14135](https://github.com/remix-run/react-router/pull/14135))
- Bubble client pre-next middleware error to the shallowest ancestor that needs to load, not strictly the shallowest ancestor with a loader ([#14150](https://github.com/remix-run/react-router/pull/14150))
- Fix optional static segment matching in `matchPath` ([#11813](https://github.com/remix-run/react-router/pull/11813))
- Fix prerendering when a `basename` is set with `ssr:false` ([#13791](https://github.com/remix-run/react-router/pull/13791))
- Provide `isRouteErrorResponse` utility in `react-server` environments ([#14166](https://github.com/remix-run/react-router/pull/14166))
- Propagate non-redirect Responses thrown from middleware to the error boundary on document/data requests ([#14182](https://github.com/remix-run/react-router/pull/14182))
- Handle `meta` and `links` Route Exports in RSC Data Mode ([#14136](https://github.com/remix-run/react-router/pull/14136))
- Properly convert returned/thrown `data()` values to `Response` instances via `Response.json()` in resource routes and middleware ([#14159](https://github.com/remix-run/react-router/pull/14159), [#14181](https://github.com/remix-run/react-router/pull/14181))

## 7.8.0

### Minor Changes

- Add `nonce` prop to `Links` & `PrefetchPageLinks` ([#14048](https://github.com/remix-run/react-router/pull/14048))
- Add `loaderData` arguments/properties alongside existing `data` arguments/properties to provide consistency and clarity between `loaderData` and `actionData` across the board ([#14047](https://github.com/remix-run/react-router/pull/14047))
  - Updated types: `Route.MetaArgs`, `Route.MetaMatch`, `MetaArgs`, `MetaMatch`, `Route.ComponentProps.matches`, `UIMatch`
  - `@deprecated` warnings have been added to the existing `data` properties to point users to new `loaderData` properties, in preparation for removing the `data` properties in a future major release

### Patch Changes

- Prevent _"Did not find corresponding fetcher result"_ console error when navigating during a `fetcher.submit` revalidation ([#14114](https://github.com/remix-run/react-router/pull/14114))

- Bubble client-side middleware errors prior to `next` to the appropriate ancestor error boundary ([#14138](https://github.com/remix-run/react-router/pull/14138))

- Switch Lazy Route Discovery manifest URL generation to usea standalone `URLSearchParams` instance instead of `URL.searchParams` to avoid a major performance bottleneck in Chrome ([#14084](https://github.com/remix-run/react-router/pull/14084))

- Adjust internal RSC usage of `React.use` to avoid Webpack compilation errors when using React 18 ([#14113](https://github.com/remix-run/react-router/pull/14113))

- Remove dependency on `@types/node` in TypeScript declaration files ([#14059](https://github.com/remix-run/react-router/pull/14059))

- Fix types for `UIMatch` to reflect that the `loaderData`/`data` properties may be `undefined` ([#12206](https://github.com/remix-run/react-router/pull/12206))
  - When an `ErrorBoundary` is being rendered, not all active matches will have loader data available, since it may have been their `loader` that threw to trigger the boundary
  - The `UIMatch.data` type was not correctly handing this and would always reflect the presence of data, leading to the unexpected runtime errors when an `ErrorBoundary` was rendered
  - ⚠️ This may cause some type errors to show up in your code for unguarded `match.data` accesses - you should properly guard for `undefined` values in those scenarios.

  ```tsx
  // app/root.tsx
  export function loader() {
    someFunctionThatThrows(); // ❌ Throws an Error
    return { title: "My Title" };
  }

  export function Layout({ children }: { children: React.ReactNode }) {
    let matches = useMatches();
    let rootMatch = matches[0] as UIMatch<Awaited<ReturnType<typeof loader>>>;
    //  ^ rootMatch.data is incorrectly typed here, so TypeScript does not
    //    complain if you do the following which throws an error at runtime:
    let { title } = rootMatch.data; // 💥

    return <html>...</html>;
  }
  ```

- \[UNSTABLE] Ensure resource route errors go through `handleError` w/middleware enabled ([#14078](https://github.com/remix-run/react-router/pull/14078))

- \[UNSTABLE] Propagate returned Response from server middleware if next wasn't called ([#14093](https://github.com/remix-run/react-router/pull/14093))

- \[UNSTABLE] Allow server middlewares to return `data()` values which will be converted into a `Response` ([#14093](https://github.com/remix-run/react-router/pull/14093))

- \[UNSTABLE] Update middleware error handling so that the `next` function never throws and instead handles any middleware errors at the proper `ErrorBoundary` and returns the `Response` up through the ancestor `next` function ([#14118](https://github.com/remix-run/react-router/pull/14118))

- \[UNSTABLE] When middleware is enabled, make the `context` parameter read-only (via `Readonly<unstable_RouterContextProvider>`) so that TypeScript will not allow you to write arbitrary fields to it in loaders, actions, or middleware. ([#14097](https://github.com/remix-run/react-router/pull/14097))

- \[UNSTABLE] Rename and alter the signature/functionality of the `unstable_respond` API in `staticHandler.query`/`staticHandler.queryRoute` ([#14103](https://github.com/remix-run/react-router/pull/14103))
  - The API has been renamed to `unstable_generateMiddlewareResponse` for clarity
  - The main functional change is that instead of running the loaders/actions before calling `unstable_respond` and handing you the result, we now pass a `query`/`queryRoute` function as a parameter and you execute the loaders/actions inside your callback, giving you full access to pre-processing and error handling
  - The `query` version of the API now has a signature of `(query: (r: Request) => Promise<StaticHandlerContext | Response>) => Promise<Response>`
  - The `queryRoute` version of the API now has a signature of `(queryRoute: (r: Request) => Promise<Response>) => Promise<Response>`
  - This allows for more advanced usages such as running logic before/after calling `query` and direct error handling of errors thrown from query
  - ⚠️ This is a breaking change if you've adopted the `staticHandler` `unstable_respond` API

  ```tsx
  let response = await staticHandler.query(request, {
    requestContext: new unstable_RouterContextProvider(),
    async unstable_generateMiddlewareResponse(query) {
      try {
        // At this point we've run middleware top-down so we need to call the
        // handlers and generate the Response to bubble back up the middleware
        let result = await query(request);
        if (isResponse(result)) {
          return result; // Redirects, etc.
        }
        return await generateHtmlResponse(result);
      } catch (error: unknown) {
        return generateErrorResponse(error);
      }
    },
  });
  ```

- \[UNSTABLE] Convert internal middleware implementations to use the new `unstable_generateMiddlewareResponse` API ([#14103](https://github.com/remix-run/react-router/pull/14103))

- \[UNSTABLE] Change `getLoadContext` signature (`type GetLoadContextFunction`) when `future.unstable_middleware` is enabled so that it returns an `unstable_RouterContextProvider` instance instead of a `Map` used to contruct the instance internally ([#14097](https://github.com/remix-run/react-router/pull/14097))
  - This also removes the `type unstable_InitialContext` export
  - ⚠️ This is a breaking change if you have adopted middleware and are using a custom server with a `getLoadContext` function

- \[UNSTABLE] Run client middleware on client navigations even if no loaders exist ([#14106](https://github.com/remix-run/react-router/pull/14106))

- \[UNSTABLE] Change the `unstable_getContext` signature on `RouterProvider`/`HydratedRouter`/`unstable_RSCHydratedRouter` so that it returns an `unstable_RouterContextProvider` instance instead of a `Map` used to contruct the instance internally ([#14097](https://github.com/remix-run/react-router/pull/14097))
  - ⚠️ This is a breaking change if you have adopted the `unstable_getContext` prop

- \[UNSTABLE] proxy server action side-effect redirects from actions for document and callServer requests ([#14131](https://github.com/remix-run/react-router/pull/14131))

- \[UNSTABLE] Fix RSC Data Mode issue where routes that return `false` from `shouldRevalidate` would be replaced by an `<Outlet />` ([#14071](https://github.com/remix-run/react-router/pull/14071))

## 7.7.1

### Patch Changes

- In RSC Data Mode, fix bug where routes with errors weren't forced to revalidate when `shouldRevalidate` returned false ([#14026](https://github.com/remix-run/react-router/pull/14026))
- In RSC Data Mode, fix `Matched leaf route at location "/..." does not have an element or Component` warnings when error boundaries are rendered. ([#14021](https://github.com/remix-run/react-router/pull/14021))

## 7.7.0

### Minor Changes

- Add unstable RSC support ([#13700](https://github.com/remix-run/react-router/pull/13700))

  For more information, see the [RSC documentation](https://reactrouter.com/start/rsc/installation).

### Patch Changes

- Handle `InvalidCharacterError` when validating cookie signature ([#13847](https://github.com/remix-run/react-router/pull/13847))

- Pass a copy of `searchParams` to the `setSearchParams` callback function to avoid muations of the internal `searchParams` instance. This was an issue when navigations were blocked because the internal instance be out of sync with `useLocation().search`. ([#12784](https://github.com/remix-run/react-router/pull/12784))

- Support invalid `Date` in `turbo-stream` v2 fork ([#13684](https://github.com/remix-run/react-router/pull/13684))

- In Framework Mode, clear critical CSS in development after initial render ([#13872](https://github.com/remix-run/react-router/pull/13872))

- Strip search parameters from `patchRoutesOnNavigation` `path` param for fetcher calls ([#13911](https://github.com/remix-run/react-router/pull/13911))

- Skip scroll restoration on useRevalidator() calls because they're not new locations ([#13671](https://github.com/remix-run/react-router/pull/13671))

- Support unencoded UTF-8 routes in prerender config with `ssr` set to `false` ([#13699](https://github.com/remix-run/react-router/pull/13699))

- Do not throw if the url hash is not a valid URI component ([#13247](https://github.com/remix-run/react-router/pull/13247))

- Fix a regression in `createRoutesStub` introduced with the middleware feature. ([#13946](https://github.com/remix-run/react-router/pull/13946))

  As part of that work we altered the signature to align with the new middleware APIs without making it backwards compatible with the prior `AppLoadContext` API. This permitted `createRoutesStub` to work if you were opting into middleware and the updated `context` typings, but broke `createRoutesStub` for users not yet opting into middleware.

  We've reverted this change and re-implemented it in such a way that both sets of users can leverage it.

  ```tsx
  // If you have not opted into middleware, the old API should work again
  let context: AppLoadContext = {
    /*...*/
  };
  let Stub = createRoutesStub(routes, context);

  // If you have opted into middleware, you should now pass an instantiated `unstable_routerContextProvider` instead of a `getContext` factory function.
  let context = new unstable_RouterContextProvider();
  context.set(SomeContext, someValue);
  let Stub = createRoutesStub(routes, context);
  ```

  ⚠️ This may be a breaking bug for if you have adopted the unstable Middleware feature and are using `createRoutesStub` with the updated API.

- Remove `Content-Length` header from Single Fetch responses ([#13902](https://github.com/remix-run/react-router/pull/13902))

## 7.6.3

### Patch Changes

- Do not serialize types for `useRouteLoaderData<typeof clientLoader>` ([#13752](https://github.com/remix-run/react-router/pull/13752))

  For types to distinguish a `clientLoader` from a `serverLoader`, you MUST annotate `clientLoader` args:

  ```ts
  //                                   👇 annotation required to skip serializing types
  export function clientLoader({}: Route.ClientLoaderArgs) {
    return { fn: () => "earth" };
  }

  function SomeComponent() {
    const data = useRouteLoaderData<typeof clientLoader>("routes/this-route");
    const planet = data?.fn() ?? "world";
    return <h1>Hello, {planet}!</h1>;
  }
  ```

## 7.6.2

### Patch Changes

- Avoid additional `with-props` chunk in Framework Mode by moving route module component prop logic from the Vite plugin to `react-router` ([#13650](https://github.com/remix-run/react-router/pull/13650))
- Slight refactor of internal `headers()` function processing for use with RSC ([#13639](https://github.com/remix-run/react-router/pull/13639))

## 7.6.1

### Patch Changes

- Update `Route.MetaArgs` to reflect that `data` can be potentially `undefined` ([#13563](https://github.com/remix-run/react-router/pull/13563))

  This is primarily for cases where a route `loader` threw an error to it's own `ErrorBoundary`. but it also arises in the case of a 404 which renders the root `ErrorBoundary`/`meta` but the root loader did not run because not routes matched.

- Partially revert optimization added in `7.1.4` to reduce calls to `matchRoutes` because it surfaced other issues ([#13562](https://github.com/remix-run/react-router/pull/13562))

- Fix typegen when same route is used at multiple paths ([#13574](https://github.com/remix-run/react-router/pull/13574))

  For example, `routes/route.tsx` is used at 4 different paths here:

  ```ts
  import { type RouteConfig, route } from "@react-router/dev/routes";
  export default [
    route("base/:base", "routes/base.tsx", [
      route("home/:home", "routes/route.tsx", { id: "home" }),
      route("changelog/:changelog", "routes/route.tsx", { id: "changelog" }),
      route("splat/*", "routes/route.tsx", { id: "splat" }),
    ]),
    route("other/:other", "routes/route.tsx", { id: "other" }),
  ] satisfies RouteConfig;
  ```

  Previously, typegen would arbitrarily pick one of these paths to be the "winner" and generate types for the route module based on that path.
  Now, typegen creates unions as necessary for alternate paths for the same route file.

- Better types for `params` ([#13543](https://github.com/remix-run/react-router/pull/13543))

  For example:

  ```ts
  // routes.ts
  import { type RouteConfig, route } from "@react-router/dev/routes";

  export default [
    route("parent/:p", "routes/parent.tsx", [
      route("layout/:l", "routes/layout.tsx", [
        route("child1/:c1a/:c1b", "routes/child1.tsx"),
        route("child2/:c2a/:c2b", "routes/child2.tsx"),
      ]),
    ]),
  ] satisfies RouteConfig;
  ```

  Previously, `params` for the `routes/layout.tsx` route were calculated as `{ p: string, l: string }`.
  This incorrectly ignores params that could come from child routes.
  If visiting `/parent/1/layout/2/child1/3/4`, the actual params passed to `routes/layout.tsx` will have a type of `{ p: string, l: string, c1a: string, c1b: string }`.

  Now, `params` are aware of child routes and autocompletion will include child params as optionals:

  ```ts
  params.|
  //     ^ cursor is here and you ask for autocompletion
  // p: string
  // l: string
  // c1a?: string
  // c1b?: string
  // c2a?: string
  // c2b?: string
  ```

  You can also narrow the types for `params` as it is implemented as a normalized union of params for each page that includes `routes/layout.tsx`:

  ```ts
  if (typeof params.c1a === 'string') {
    params.|
    //     ^ cursor is here and you ask for autocompletion
    // p: string
    // l: string
    // c1a: string
    // c1b: string
  }
  ```

  ***

  UNSTABLE: renamed internal `react-router/route-module` export to `react-router/internal`
  UNSTABLE: removed `Info` export from generated `+types/*` files

- Avoid initial fetcher execution 404 error when Lazy Route Discovery is interrupted by a navigation ([#13564](https://github.com/remix-run/react-router/pull/13564))

- href replaces splats `*` ([#13593](https://github.com/remix-run/react-router/pull/13593))

  ```ts
  const a = href("/products/*", { "*": "/1/edit" });
  // -> /products/1/edit
  ```

## 7.6.0

### Minor Changes

- Added a new `react-router.config.ts` `routeDiscovery` option to configure Lazy Route Discovery behavior. ([#13451](https://github.com/remix-run/react-router/pull/13451))
  - By default, Lazy Route Discovery is enabled and makes manifest requests to the `/__manifest` path:
    - `routeDiscovery: { mode: "lazy", manifestPath: "/__manifest" }`
  - You can modify the manifest path used:
    - `routeDiscovery: { mode: "lazy", manifestPath: "/custom-manifest" }`
  - Or you can disable this feature entirely and include all routes in the manifest on initial document load:
    - `routeDiscovery: { mode: "initial" }`

- Add support for route component props in `createRoutesStub`. This allows you to unit test your route components using the props instead of the hooks: ([#13528](https://github.com/remix-run/react-router/pull/13528))

  ```tsx
  let RoutesStub = createRoutesStub([
    {
      path: "/",
      Component({ loaderData }) {
        let data = loaderData as { message: string };
        return <pre data-testid="data">Message: {data.message}</pre>;
      },
      loader() {
        return { message: "hello" };
      },
    },
  ]);

  render(<RoutesStub />);

  await waitFor(() => screen.findByText("Message: hello"));
  ```

### Patch Changes

- Fix `react-router` module augmentation for `NodeNext` ([#13498](https://github.com/remix-run/react-router/pull/13498))

- Don't bundle `react-router` in `react-router/dom` CJS export ([#13497](https://github.com/remix-run/react-router/pull/13497))

- Fix bug where a submitting `fetcher` would get stuck in a `loading` state if a revalidating `loader` redirected ([#12873](https://github.com/remix-run/react-router/pull/12873))

- Fix hydration error if a server `loader` returned `undefined` ([#13496](https://github.com/remix-run/react-router/pull/13496))

- Fix initial load 404 scenarios in data mode ([#13500](https://github.com/remix-run/react-router/pull/13500))

- Stabilize `useRevalidator`'s `revalidate` function ([#13542](https://github.com/remix-run/react-router/pull/13542))

- Preserve status code if a `clientAction` throws a `data()` result in framework mode ([#13522](https://github.com/remix-run/react-router/pull/13522))

- Be defensive against leading double slashes in paths to avoid `Invalid URL` errors from the URL constructor ([#13510](https://github.com/remix-run/react-router/pull/13510))
  - Note we do not sanitize/normalize these paths - we only detect them so we can avoid the error that would be thrown by `new URL("//", window.location.origin)`

- Remove `Navigator` declaration for `navigator.connection.saveData` to avoid messing with any other types beyond `saveData` in userland ([#13512](https://github.com/remix-run/react-router/pull/13512))

- Fix `handleError` `params` values on `.data` requests for routes with a dynamic param as the last URL segment ([#13481](https://github.com/remix-run/react-router/pull/13481))

- Don't trigger an `ErrorBoundary` UI before the reload when we detect a manifest verison mismatch in Lazy Route Discovery ([#13480](https://github.com/remix-run/react-router/pull/13480))

- Inline `turbo-stream@2.4.1` dependency and fix decoding ordering of Map/Set instances ([#13518](https://github.com/remix-run/react-router/pull/13518))

- Only render dev warnings in DEV mode ([#13461](https://github.com/remix-run/react-router/pull/13461))

- UNSTABLE: Fix a few bugs with error bubbling in middleware use-cases ([#13538](https://github.com/remix-run/react-router/pull/13538))

- Short circuit post-processing on aborted `dataStrategy` requests ([#13521](https://github.com/remix-run/react-router/pull/13521))
  - This resolves non-user-facing console errors of the form `Cannot read properties of undefined (reading 'result')`

## 7.5.3

### Patch Changes

- Fix bug where bubbled action errors would result in `loaderData` being cleared at the handling `ErrorBoundary` route ([#13476](https://github.com/remix-run/react-router/pull/13476))
- Handle redirects from `clientLoader.hydrate` initial load executions ([#13477](https://github.com/remix-run/react-router/pull/13477))

## 7.5.2

### Patch Changes

- Update Single Fetch to also handle the 204 redirects used in `?_data` requests in Remix v2 ([#13364](https://github.com/remix-run/react-router/pull/13364))
  - This allows applications to return a redirect on `.data` requests from outside the scope of React Router (i.e., an `express`/`hono` middleware)
  - ⚠️ Please note that doing so relies on implementation details that are subject to change without a SemVer major release
  - This is primarily done to ease upgrading to Single Fetch for existing Remix v2 applications, but the recommended way to handle this is redirecting from a route middleware

- Adjust approach for Prerendering/SPA Mode via headers ([#13453](https://github.com/remix-run/react-router/pull/13453))

## 7.5.1

### Patch Changes

- Fix single fetch bug where no revalidation request would be made when navigating upwards to a reused parent route ([#13253](https://github.com/remix-run/react-router/pull/13253))

- When using the object-based `route.lazy` API, the `HydrateFallback` and `hydrateFallbackElement` properties are now skipped when lazy loading routes after hydration. ([#13376](https://github.com/remix-run/react-router/pull/13376))

  If you move the code for these properties into a separate file, you can use this optimization to avoid downloading unused hydration code. For example:

  ```ts
  createBrowserRouter([
    {
      path: "/show/:showId",
      lazy: {
        loader: async () => (await import("./show.loader.js")).loader,
        Component: async () => (await import("./show.component.js")).Component,
        HydrateFallback: async () =>
          (await import("./show.hydrate-fallback.js")).HydrateFallback,
      },
    },
  ]);
  ```

- Properly revalidate prerendered paths when param values change ([#13380](https://github.com/remix-run/react-router/pull/13380))

- UNSTABLE: Add a new `unstable_runClientMiddleware` argument to `dataStrategy` to enable middleware execution in custom `dataStrategy` implementations ([#13395](https://github.com/remix-run/react-router/pull/13395))

- UNSTABLE: Add better error messaging when `getLoadContext` is not updated to return a `Map`" ([#13242](https://github.com/remix-run/react-router/pull/13242))

- Do not automatically add `null` to `staticHandler.query()` `context.loaderData` if routes do not have loaders ([#13223](https://github.com/remix-run/react-router/pull/13223))
  - This was a Remix v2 implementation detail inadvertently left in for React Router v7
  - Now that we allow returning `undefined` from loaders, our prior check of `loaderData[routeId] !== undefined` was no longer sufficient and was changed to a `routeId in loaderData` check - these `null` values can cause issues for this new check
  - ⚠️ This could be a "breaking bug fix" for you if you are doing manual SSR with `createStaticHandler()`/`<StaticRouterProvider>`, and using `context.loaderData` to control `<RouterProvider>` hydration behavior on the client

- Fix prerendering when a loader returns a redirect ([#13365](https://github.com/remix-run/react-router/pull/13365))

- UNSTABLE: Update context type for `LoaderFunctionArgs`/`ActionFunctionArgs` when middleware is enabled ([#13381](https://github.com/remix-run/react-router/pull/13381))

- Add support for the new `unstable_shouldCallHandler`/`unstable_shouldRevalidateArgs` APIs in `dataStrategy` ([#13253](https://github.com/remix-run/react-router/pull/13253))

## 7.5.0

### Minor Changes

- Add granular object-based API for `route.lazy` to support lazy loading of individual route properties, for example: ([#13294](https://github.com/remix-run/react-router/pull/13294))

  ```ts
  createBrowserRouter([
    {
      path: "/show/:showId",
      lazy: {
        loader: async () => (await import("./show.loader.js")).loader,
        action: async () => (await import("./show.action.js")).action,
        Component: async () => (await import("./show.component.js")).Component,
      },
    },
  ]);
  ```

  **Breaking change for `route.unstable_lazyMiddleware` consumers**

  The `route.unstable_lazyMiddleware` property is no longer supported. If you want to lazily load middleware, you must use the new object-based `route.lazy` API with `route.lazy.unstable_middleware`, for example:

  ```ts
  createBrowserRouter([
    {
      path: "/show/:showId",
      lazy: {
        unstable_middleware: async () =>
          (await import("./show.middleware.js")).middleware,
        // etc.
      },
    },
  ]);
  ```

### Patch Changes

- Introduce `unstable_subResourceIntegrity` future flag that enables generation of an importmap with integrity for the scripts that will be loaded by the browser. ([#13163](https://github.com/remix-run/react-router/pull/13163))

## 7.4.1

### Patch Changes

- Fix types on `unstable_MiddlewareFunction` to avoid type errors when a middleware doesn't return a value ([#13311](https://github.com/remix-run/react-router/pull/13311))
- Dedupe calls to `route.lazy` functions ([#13260](https://github.com/remix-run/react-router/pull/13260))
- Add support for `route.unstable_lazyMiddleware` function to allow lazy loading of middleware logic. ([#13210](https://github.com/remix-run/react-router/pull/13210))

  **Breaking change for `unstable_middleware` consumers**

  The `route.unstable_middleware` property is no longer supported in the return value from `route.lazy`. If you want to lazily load middleware, you must use `route.unstable_lazyMiddleware`.

## 7.4.0

### Patch Changes

- Fix root loader data on initial load redirects in SPA mode ([#13222](https://github.com/remix-run/react-router/pull/13222))
- Load ancestor pathless/index routes in lazy route discovery for upwards non-eager-discoery routing ([#13203](https://github.com/remix-run/react-router/pull/13203))
- Fix `shouldRevalidate` behavior for `clientLoader`-only routes in `ssr:true` apps ([#13221](https://github.com/remix-run/react-router/pull/13221))
- UNSTABLE: Fix `RequestHandler` `loadContext` parameter type when middleware is enabled ([#13204](https://github.com/remix-run/react-router/pull/13204))
- UNSTABLE: Update `Route.unstable_MiddlewareFunction` to have a return value of `Response | undefined` instead of `Response | void` becaue you should not return anything if you aren't returning the `Response` ([#13199](https://github.com/remix-run/react-router/pull/13199))
- UNSTABLE(BREAKING): If a middleware throws an error, ensure we only bubble the error itself via `next()` and are no longer leaking the `MiddlewareError` implementation detail ([#13180](https://github.com/remix-run/react-router/pull/13180))

## 7.3.0

### Minor Changes

- Add `fetcherKey` as a parameter to `patchRoutesOnNavigation` ([#13061](https://github.com/remix-run/react-router/pull/13061))
  - In framework mode, Lazy Route Discovery will now detect manifest version mismatches after a new deploy
  - On navigations to undiscovered routes, this mismatch will trigger a document reload of the destination path
  - On `fetcher` calls to undiscovered routes, this mismatch will trigger a document reload of the current path

### Patch Changes

- Skip resource route flow in dev server in SPA mode ([#13113](https://github.com/remix-run/react-router/pull/13113))

- Support middleware on routes (unstable) ([#12941](https://github.com/remix-run/react-router/pull/12941))

  Middleware is implemented behind a `future.unstable_middleware` flag. To enable, you must enable the flag and the types in your `react-router-config.ts` file:

  ```ts
  import type { Config } from "@react-router/dev/config";
  import type { Future } from "react-router";

  declare module "react-router" {
    interface Future {
      unstable_middleware: true; // 👈 Enable middleware types
    }
  }

  export default {
    future: {
      unstable_middleware: true, // 👈 Enable middleware
    },
  } satisfies Config;
  ```

  ⚠️ Middleware is unstable and should not be adopted in production. There is at least one known de-optimization in route module loading for `clientMiddleware` that we will be addressing this before a stable release.

  ⚠️ Enabling middleware contains a breaking change to the `context` parameter passed to your `loader`/`action` functions - see below for more information.

  Once enabled, routes can define an array of middleware functions that will run sequentially before route handlers run. These functions accept the same parameters as `loader`/`action` plus an additional `next` parameter to run the remaining data pipeline. This allows middlewares to perform logic before and after handlers execute.

  ```tsx
  // Framework mode
  export const unstable_middleware = [serverLogger, serverAuth]; // server
  export const unstable_clientMiddleware = [clientLogger]; // client

  // Library mode
  const routes = [
    {
      path: "/",
      // Middlewares are client-side for library mode SPA's
      unstable_middleware: [clientLogger, clientAuth],
      loader: rootLoader,
      Component: Root,
    },
  ];
  ```

  Here's a simple example of a client-side logging middleware that can be placed on the root route:

  ```tsx
  const clientLogger: Route.unstable_ClientMiddlewareFunction = async (
    { request },
    next,
  ) => {
    let start = performance.now();

    // Run the remaining middlewares and all route loaders
    await next();

    let duration = performance.now() - start;
    console.log(`Navigated to ${request.url} (${duration}ms)`);
  };
  ```

  Note that in the above example, the `next`/`middleware` functions don't return anything. This is by design as on the client there is no "response" to send over the network like there would be for middlewares running on the server. The data is all handled behind the scenes by the stateful `router`.

  For a server-side middleware, the `next` function will return the HTTP `Response` that React Router will be sending across the wire, thus giving you a chance to make changes as needed. You may throw a new response to short circuit and respond immediately, or you may return a new or altered response to override the default returned by `next()`.

  ```tsx
  const serverLogger: Route.unstable_MiddlewareFunction = async (
    { request, params, context },
    next,
  ) => {
    let start = performance.now();

    // 👇 Grab the response here
    let res = await next();

    let duration = performance.now() - start;
    console.log(`Navigated to ${request.url} (${duration}ms)`);

    // 👇 And return it here (optional if you don't modify the response)
    return res;
  };
  ```

  You can throw a `redirect` from a middleware to short circuit any remaining processing:

  ```tsx
  import { sessionContext } from "../context";
  const serverAuth: Route.unstable_MiddlewareFunction = (
    { request, params, context },
    next,
  ) => {
    let session = context.get(sessionContext);
    let user = session.get("user");
    if (!user) {
      session.set("returnTo", request.url);
      throw redirect("/login", 302);
    }
  };
  ```

  _Note that in cases like this where you don't need to do any post-processing you don't need to call the `next` function or return a `Response`._

  Here's another example of using a server middleware to detect 404s and check the CMS for a redirect:

  ```tsx
  const redirects: Route.unstable_MiddlewareFunction = async ({
    request,
    next,
  }) => {
    // attempt to handle the request
    let res = await next();

    // if it's a 404, check the CMS for a redirect, do it last
    // because it's expensive
    if (res.status === 404) {
      let cmsRedirect = await checkCMSRedirects(request.url);
      if (cmsRedirect) {
        throw redirect(cmsRedirect, 302);
      }
    }

    return res;
  };
  ```

  **`context` parameter**

  When middleware is enabled, your application will use a different type of `context` parameter in your loaders and actions to provide better type safety. Instead of `AppLoadContext`, `context` will now be an instance of `ContextProvider` that you can use with type-safe contexts (similar to `React.createContext`):

  ```ts
  import { unstable_createContext } from "react-router";
  import { Route } from "./+types/root";
  import type { Session } from "./sessions.server";
  import { getSession } from "./sessions.server";

  let sessionContext = unstable_createContext<Session>();

  const sessionMiddleware: Route.unstable_MiddlewareFunction = ({
    context,
    request,
  }) => {
    let session = await getSession(request);
    context.set(sessionContext, session);
    //                          ^ must be of type Session
  };

  // ... then in some downstream middleware
  const loggerMiddleware: Route.unstable_MiddlewareFunction = ({
    context,
    request,
  }) => {
    let session = context.get(sessionContext);
    //  ^ typeof Session
    console.log(session.get("userId"), request.method, request.url);
  };

  // ... or some downstream loader
  export function loader({ context }: Route.LoaderArgs) {
    let session = context.get(sessionContext);
    let profile = await getProfile(session.get("userId"));
    return { profile };
  }
  ```

  If you are using a custom server with a `getLoadContext` function, the return value for initial context values passed from the server adapter layer is no longer an object and should now return an `unstable_InitialContext` (`Map<RouterContext, unknown>`):

  ```ts
  let adapterContext = unstable_createContext<MyAdapterContext>();

  function getLoadContext(req, res): unstable_InitialContext {
    let map = new Map();
    map.set(adapterContext, getAdapterContext(req));
    return map;
  }
  ```

- Fix types for loaderData and actionData that contained `Record`s ([#13139](https://github.com/remix-run/react-router/pull/13139))

  UNSTABLE(BREAKING):

  `unstable_SerializesTo` added a way to register custom serialization types in Single Fetch for other library and framework authors like Apollo.
  It was implemented with branded type whose branded property that was made optional so that casting arbitrary values was easy:

  ```ts
  // without the brand being marked as optional
  let x1 = 42 as unknown as unstable_SerializesTo<number>;
  //          ^^^^^^^^^^

  // with the brand being marked as optional
  let x2 = 42 as unstable_SerializesTo<number>;
  ```

  However, this broke type inference in `loaderData` and `actionData` for any `Record` types as those would now (incorrectly) match `unstable_SerializesTo`.
  This affected all users, not just those that depended on `unstable_SerializesTo`.
  To fix this, the branded property of `unstable_SerializesTo` is marked as required instead of optional.

  For library and framework authors using `unstable_SerializesTo`, you may need to add `as unknown` casts before casting to `unstable_SerializesTo`.

- Fix single fetch `_root.data` requests when a `basename` is used ([#12898](https://github.com/remix-run/react-router/pull/12898))

- Add `context` support to client side data routers (unstable) ([#12941](https://github.com/remix-run/react-router/pull/12941))

  Your application `loader` and `action` functions on the client will now receive a `context` parameter. This is an instance of `unstable_RouterContextProvider` that you use with type-safe contexts (similar to `React.createContext`) and is most useful with the corresponding `middleware`/`clientMiddleware` API's:

  ```ts
  import { unstable_createContext } from "react-router";

  type User = {
    /*...*/
  };

  let userContext = unstable_createContext<User>();

  function sessionMiddleware({ context }) {
    let user = await getUser();
    context.set(userContext, user);
  }

  // ... then in some downstream loader
  function loader({ context }) {
    let user = context.get(userContext);
    let profile = await getProfile(user.id);
    return { profile };
  }
  ```

  Similar to server-side requests, a fresh `context` will be created per navigation (or `fetcher` call). If you have initial data you'd like to populate in the context for every request, you can provide an `unstable_getContext` function at the root of your app:
  - Library mode - `createBrowserRouter(routes, { unstable_getContext })`
  - Framework mode - `<HydratedRouter unstable_getContext>`

  This function should return an value of type `unstable_InitialContext` which is a `Map<unstable_RouterContext, unknown>` of context's and initial values:

  ```ts
  const loggerContext = unstable_createContext<(...args: unknown[]) => void>();

  function logger(...args: unknown[]) {
    console.log(new Date.toISOString(), ...args);
  }

  function unstable_getContext() {
    let map = new Map();
    map.set(loggerContext, logger);
    return map;
  }
  ```

## 7.2.0

### Minor Changes

- New type-safe `href` utility that guarantees links point to actual paths in your app ([#13012](https://github.com/remix-run/react-router/pull/13012))

  ```tsx
  import { href } from "react-router";

  export default function Component() {
    const link = href("/blog/:slug", { slug: "my-first-post" });
    return (
      <main>
        <Link to={href("/products/:id", { id: "asdf" })} />
        <NavLink to={href("/:lang?/about", { lang: "en" })} />
      </main>
    );
  }
  ```

### Patch Changes

- Fix typegen for repeated params ([#13012](https://github.com/remix-run/react-router/pull/13012))

  In React Router, path parameters are keyed by their name.
  So for a path pattern like `/a/:id/b/:id?/c/:id`, the last `:id` will set the value for `id` in `useParams` and the `params` prop.
  For example, `/a/1/b/2/c/3` will result in the value `{ id: 3 }` at runtime.

  Previously, generated types for params incorrectly modeled repeated params with an array.
  So `/a/1/b/2/c/3` generated a type like `{ id: [1,2,3] }`.

  To be consistent with runtime behavior, the generated types now correctly model the "last one wins" semantics of path parameters.
  So `/a/1/b/2/c/3` now generates a type like `{ id: 3 }`.

- Don't apply Single Fetch revalidation de-optimization when in SPA mode since there is no server HTTP request ([#12948](https://github.com/remix-run/react-router/pull/12948))

- Properly handle revalidations to across a prerender/SPA boundary ([#13021](https://github.com/remix-run/react-router/pull/13021))
  - In "hybrid" applications where some routes are pre-rendered and some are served from a SPA fallback, we need to avoid making `.data` requests if the path wasn't pre-rendered because the request will 404
  - We don't know all the pre-rendered paths client-side, however:
    - All `loader` data in `ssr:false` mode is static because it's generated at build time
    - A route must use a `clientLoader` to do anything dynamic
    - Therefore, if a route only has a `loader` and not a `clientLoader`, we disable revalidation by default because there is no new data to retrieve
    - We short circuit and skip single fetch `.data` request logic if there are no server loaders with `shouldLoad=true` in our single fetch `dataStrategy`
    - This ensures that the route doesn't cause a `.data` request that would 404 after a submission

- Error at build time in `ssr:false` + `prerender` apps for the edge case scenario of: ([#13021](https://github.com/remix-run/react-router/pull/13021))
  - A parent route has only a `loader` (does not have a `clientLoader`)
  - The parent route is pre-rendered
  - The parent route has children routes which are not prerendered
  - This means that when the child paths are loaded via the SPA fallback, the parent won't have any `loaderData` because there is no server on which to run the `loader`
  - This can be resolved by either adding a parent `clientLoader` or pre-rendering the child paths
  - If you add a `clientLoader`, calling the `serverLoader()` on non-prerendered paths will throw a 404

- Add unstable support for splitting route modules in framework mode via `future.unstable_splitRouteModules` ([#11871](https://github.com/remix-run/react-router/pull/11871))

- Add `unstable_SerializesTo` brand type for library authors to register types serializable by React Router's streaming format (`turbo-stream`) ([`ab5b05b02`](https://github.com/remix-run/react-router/commit/ab5b05b02f99f062edb3c536c392197c88eb6c77))

- Align dev server behavior with static file server behavior when `ssr:false` is set ([#12948](https://github.com/remix-run/react-router/pull/12948))
  - When no `prerender` config exists, only SSR down to the root `HydrateFallback` (SPA Mode)
  - When a `prerender` config exists but the current path is not prerendered, only SSR down to the root `HydrateFallback` (SPA Fallback)
  - Return a 404 on `.data` requests to non-pre-rendered paths

- Improve prefetch performance of CSS side effects in framework mode ([#12889](https://github.com/remix-run/react-router/pull/12889))

- Disable Lazy Route Discovery for all `ssr:false` apps and not just "SPA Mode" because there is no runtime server to serve the search-param-configured `__manifest` requests ([#12894](https://github.com/remix-run/react-router/pull/12894))
  - We previously only disabled this for "SPA Mode" which is `ssr:false` and no `prerender` config but we realized it should apply to all `ssr:false` apps, including those prerendering multiple pages
  - In those `prerender` scenarios we would prerender the `/__manifest` file assuming the static file server would serve it but that makes some unneccesary assumptions about the static file server behaviors

- Properly handle interrupted manifest requests in lazy route discovery ([#12915](https://github.com/remix-run/react-router/pull/12915))

## 7.1.5

### Patch Changes

- Fix regression introduced in `7.1.4` via [#12800](https://github.com/remix-run/react-router/pull/12800) that caused issues navigating to hash routes inside splat routes for applications using Lazy Route Discovery (`patchRoutesOnNavigation`) ([#12927](https://github.com/remix-run/react-router/pull/12927))

## 7.1.4

### Patch Changes

- Internal reorg to clean up some duplicated route module types ([#12799](https://github.com/remix-run/react-router/pull/12799))
- Properly handle status codes that cannot have a body in single fetch responses (204, etc.) ([#12760](https://github.com/remix-run/react-router/pull/12760))
- Stop erroring on resource routes that return raw strings/objects and instead serialize them as `text/plain` or `application/json` responses ([#12848](https://github.com/remix-run/react-router/pull/12848))
  - This only applies when accessed as a resource route without the `.data` extension
  - When accessed from a Single Fetch `.data` request, they will still be encoded via `turbo-stream`
- Optimize Lazy Route Discovery path discovery to favor a single `querySelectorAll` call at the `body` level instead of many calls at the sub-tree level ([#12731](https://github.com/remix-run/react-router/pull/12731))
- Properly bubble headers as `errorHeaders` when throwing a `data()` result ([#12846](https://github.com/remix-run/react-router/pull/12846))
  - Avoid duplication of `Set-Cookie` headers could be duplicated if also returned from `headers`
- Optimize route matching by skipping redundant `matchRoutes` calls when possible ([#12800](https://github.com/remix-run/react-router/pull/12800))

## 7.1.3

_No changes_

## 7.1.2

### Patch Changes

- Fix issue with fetcher data cleanup in the data layer on fetcher unmount ([#12681](https://github.com/remix-run/react-router/pull/12681))
- Do not rely on `symbol` for filtering out `redirect` responses from loader data ([#12694](https://github.com/remix-run/react-router/pull/12694))

  Previously, some projects were getting type checking errors like:

  ```ts
  error TS4058: Return type of exported function has or is using name 'redirectSymbol' from external module "node_modules/..." but cannot be named.
  ```

  Now that `symbol`s are not used for the `redirect` response type, these errors should no longer be present.

## 7.1.1

_No changes_

## 7.1.0

### Patch Changes

- Throw unwrapped single fetch redirect to align with pre-single fetch behavior ([#12506](https://github.com/remix-run/react-router/pull/12506))
- Ignore redirects when inferring loader data types ([#12527](https://github.com/remix-run/react-router/pull/12527))
- Remove `<Link prefetch>` warning which suffers from false positives in a lazy route discovery world ([#12485](https://github.com/remix-run/react-router/pull/12485))

## 7.0.2

### Patch Changes

- temporarily only use one build in export map so packages can have a peer dependency on react router ([#12437](https://github.com/remix-run/react-router/pull/12437))
- Generate wide `matches` and `params` types for current route and child routes ([#12397](https://github.com/remix-run/react-router/pull/12397))

  At runtime, `matches` includes child route matches and `params` include child route path parameters.
  But previously, we only generated types for parent routes in `matches`; for `params`, we only considered the parent routes and the current route.
  To align our generated types more closely to the runtime behavior, we now generate more permissive, wider types when accessing child route information.

## 7.0.1

_No changes_

## 7.0.0

### Major Changes

- Remove the original `defer` implementation in favor of using raw promises via single fetch and `turbo-stream`. This removes these exports from React Router: ([#11744](https://github.com/remix-run/react-router/pull/11744))
  - `defer`
  - `AbortedDeferredError`
  - `type TypedDeferredData`
  - `UNSAFE_DeferredData`
  - `UNSAFE_DEFERRED_SYMBOL`,

- - Collapse `@remix-run/router` into `react-router` ([#11505](https://github.com/remix-run/react-router/pull/11505))
  - Collapse `react-router-dom` into `react-router`
  - Collapse `@remix-run/server-runtime` into `react-router`
  - Collapse `@remix-run/testing` into `react-router`

- Remove single fetch future flag. ([#11522](https://github.com/remix-run/react-router/pull/11522))

- Drop support for Node 16, React Router SSR now requires Node 18 or higher ([#11391](https://github.com/remix-run/react-router/pull/11391))

- Remove `future.v7_startTransition` flag ([#11696](https://github.com/remix-run/react-router/pull/11696))

- - Expose the underlying router promises from the following APIs for compsition in React 19 APIs: ([#11521](https://github.com/remix-run/react-router/pull/11521))
    - `useNavigate()`
    - `useSubmit`
    - `useFetcher().load`
    - `useFetcher().submit`
    - `useRevalidator.revalidate`

- Remove `future.v7_normalizeFormMethod` future flag ([#11697](https://github.com/remix-run/react-router/pull/11697))

- For Remix consumers migrating to React Router, the `crypto` global from the [Web Crypto API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API) is now required when using cookie and session APIs. This means that the following APIs are provided from `react-router` rather than platform-specific packages: ([#11837](https://github.com/remix-run/react-router/pull/11837))
  - `createCookie`
  - `createCookieSessionStorage`
  - `createMemorySessionStorage`
  - `createSessionStorage`

  For consumers running older versions of Node, the `installGlobals` function from `@remix-run/node` has been updated to define `globalThis.crypto`, using [Node's `require('node:crypto').webcrypto` implementation.](https://nodejs.org/api/webcrypto.html)

  Since platform-specific packages no longer need to implement this API, the following low-level APIs have been removed:
  - `createCookieFactory`
  - `createSessionStorageFactory`
  - `createCookieSessionStorageFactory`
  - `createMemorySessionStorageFactory`

- Imports/Exports cleanup ([#11840](https://github.com/remix-run/react-router/pull/11840))
  - Removed the following exports that were previously public API from `@remix-run/router`
    - types
      - `AgnosticDataIndexRouteObject`
      - `AgnosticDataNonIndexRouteObject`
      - `AgnosticDataRouteMatch`
      - `AgnosticDataRouteObject`
      - `AgnosticIndexRouteObject`
      - `AgnosticNonIndexRouteObject`
      - `AgnosticRouteMatch`
      - `AgnosticRouteObject`
      - `TrackedPromise`
      - `unstable_AgnosticPatchRoutesOnMissFunction`
      - `Action` -> exported as `NavigationType` via `react-router`
      - `Router` exported as `DataRouter` to differentiate from RR's `<Router>`
    - API
      - `getToPathname` (`@private`)
      - `joinPaths` (`@private`)
      - `normalizePathname` (`@private`)
      - `resolveTo` (`@private`)
      - `stripBasename` (`@private`)
      - `createBrowserHistory` -> in favor of `createBrowserRouter`
      - `createHashHistory` -> in favor of `createHashRouter`
      - `createMemoryHistory` -> in favor of `createMemoryRouter`
      - `createRouter`
      - `createStaticHandler` -> in favor of wrapper `createStaticHandler` in RR Dom
      - `getStaticContextFromError`
  - Removed the following exports that were previously public API from `react-router`
    - `Hash`
    - `Pathname`
    - `Search`

- update minimum node version to 18 ([#11690](https://github.com/remix-run/react-router/pull/11690))

- Remove `future.v7_prependBasename` from the ionternalized `@remix-run/router` package ([#11726](https://github.com/remix-run/react-router/pull/11726))

- Migrate Remix type generics to React Router ([#12180](https://github.com/remix-run/react-router/pull/12180))
  - These generics are provided for Remix v2 migration purposes
  - These generics and the APIs they exist on should be considered informally deprecated in favor of the new `Route.*` types
  - Anyone migrating from React Router v6 should probably not leverage these new generics and should migrate straight to the `Route.*` types
  - For React Router v6 users, these generics are new and should not impact your app, with one exception
    - `useFetcher` previously had an optional generic (used primarily by Remix v2) that expected the data type
    - This has been updated in v7 to expect the type of the function that generates the data (i.e., `typeof loader`/`typeof action`)
    - Therefore, you should update your usages:
      - ❌ `useFetcher<LoaderData>()`
      - ✅ `useFetcher<typeof loader>()`

- Remove `future.v7_throwAbortReason` from internalized `@remix-run/router` package ([#11728](https://github.com/remix-run/react-router/pull/11728))

- Add `exports` field to all packages ([#11675](https://github.com/remix-run/react-router/pull/11675))

- node package no longer re-exports from react-router ([#11702](https://github.com/remix-run/react-router/pull/11702))

- renamed RemixContext to FrameworkContext ([#11705](https://github.com/remix-run/react-router/pull/11705))

- updates the minimum React version to 18 ([#11689](https://github.com/remix-run/react-router/pull/11689))

- PrefetchPageDescriptor replaced by PageLinkDescriptor ([#11960](https://github.com/remix-run/react-router/pull/11960))

- - Consolidate types previously duplicated across `@remix-run/router`, `@remix-run/server-runtime`, and `@remix-run/react` now that they all live in `react-router` ([#12177](https://github.com/remix-run/react-router/pull/12177))
    - Examples: `LoaderFunction`, `LoaderFunctionArgs`, `ActionFunction`, `ActionFunctionArgs`, `DataFunctionArgs`, `RouteManifest`, `LinksFunction`, `Route`, `EntryRoute`
    - The `RouteManifest` type used by the "remix" code is now slightly stricter because it is using the former `@remix-run/router` `RouteManifest`
      - `Record<string, Route> -> Record<string, Route | undefined>`
    - Removed `AppData` type in favor of inlining `unknown` in the few locations it was used
    - Removed `ServerRuntimeMeta*` types in favor of the `Meta*` types they were duplicated from

- - Remove the `future.v7_partialHydration` flag ([#11725](https://github.com/remix-run/react-router/pull/11725))
    - This also removes the `<RouterProvider fallbackElement>` prop
      - To migrate, move the `fallbackElement` to a `hydrateFallbackElement`/`HydrateFallback` on your root route
    - Also worth nothing there is a related breaking changer with this future flag:
      - Without `future.v7_partialHydration` (when using `fallbackElement`), `state.navigation` was populated during the initial load
      - With `future.v7_partialHydration`, `state.navigation` remains in an `"idle"` state during the initial load

- Remove `v7_relativeSplatPath` future flag ([#11695](https://github.com/remix-run/react-router/pull/11695))

- Drop support for Node 18, update minimum Node vestion to 20 ([#12171](https://github.com/remix-run/react-router/pull/12171))
  - Remove `installGlobals()` as this should no longer be necessary

- Remove remaining future flags ([#11820](https://github.com/remix-run/react-router/pull/11820))
  - React Router `v7_skipActionErrorRevalidation`
  - Remix `v3_fetcherPersist`, `v3_relativeSplatPath`, `v3_throwAbortReason`

- rename createRemixStub to createRoutesStub ([#11692](https://github.com/remix-run/react-router/pull/11692))

- Remove `@remix-run/router` deprecated `detectErrorBoundary` option in favor of `mapRouteProperties` ([#11751](https://github.com/remix-run/react-router/pull/11751))

- Add `react-router/dom` subpath export to properly enable `react-dom` as an optional `peerDependency` ([#11851](https://github.com/remix-run/react-router/pull/11851))
  - This ensures that we don't blindly `import ReactDOM from "react-dom"` in `<RouterProvider>` in order to access `ReactDOM.flushSync()`, since that would break `createMemoryRouter` use cases in non-DOM environments
  - DOM environments should import from `react-router/dom` to get the proper component that makes `ReactDOM.flushSync()` available:
    - If you are using the Vite plugin, use this in your `entry.client.tsx`:
      - `import { HydratedRouter } from 'react-router/dom'`
    - If you are not using the Vite plugin and are manually calling `createBrowserRouter`/`createHashRouter`:
      - `import { RouterProvider } from "react-router/dom"`

- Remove `future.v7_fetcherPersist` flag ([#11731](https://github.com/remix-run/react-router/pull/11731))

- Update `cookie` dependency to `^1.0.1` - please see the [release notes](https://github.com/jshttp/cookie/releases) for any breaking changes ([#12172](https://github.com/remix-run/react-router/pull/12172))

### Minor Changes

- - Add support for `prerender` config in the React Router vite plugin, to support existing SSG use-cases ([#11539](https://github.com/remix-run/react-router/pull/11539))
    - You can use the `prerender` config to pre-render your `.html` and `.data` files at build time and then serve them statically at runtime (either from a running server or a CDN)
    - `prerender` can either be an array of string paths, or a function (sync or async) that returns an array of strings so that you can dynamically generate the paths by talking to your CMS, etc.

  ```ts
  // react-router.config.ts
  import type { Config } from "@react-router/dev/config";

  export default {
    async prerender() {
      let slugs = await fakeGetSlugsFromCms();
      // Prerender these paths into `.html` files at build time, and `.data`
      // files if they have loaders
      return ["/", "/about", ...slugs.map((slug) => `/product/${slug}`)];
    },
  } satisfies Config;

  async function fakeGetSlugsFromCms() {
    await new Promise((r) => setTimeout(r, 1000));
    return ["shirt", "hat"];
  }
  ```

- Params, loader data, and action data as props for route component exports ([#11961](https://github.com/remix-run/react-router/pull/11961))

  ```tsx
  export default function Component({ params, loaderData, actionData }) {}

  export function HydrateFallback({ params }) {}
  export function ErrorBoundary({ params, loaderData, actionData }) {}
  ```

- Remove duplicate `RouterProvider` impliementations ([#11679](https://github.com/remix-run/react-router/pull/11679))

- ### Typesafety improvements ([#12019](https://github.com/remix-run/react-router/pull/12019))

  React Router now generates types for each of your route modules.
  You can access those types by importing them from `./+types.<route filename without extension>`.
  For example:

  ```ts
  // app/routes/product.tsx
  import type * as Route from "./+types.product";

  export function loader({ params }: Route.LoaderArgs) {}

  export default function Component({ loaderData }: Route.ComponentProps) {}
  ```

  This initial implementation targets type inference for:
  - `Params` : Path parameters from your routing config in `routes.ts` including file-based routing
  - `LoaderData` : Loader data from `loader` and/or `clientLoader` within your route module
  - `ActionData` : Action data from `action` and/or `clientAction` within your route module

  In the future, we plan to add types for the rest of the route module exports: `meta`, `links`, `headers`, `shouldRevalidate`, etc.
  We also plan to generate types for typesafe `Link`s:

  ```tsx
  <Link to="/products/:id" params={{ id: 1 }} />
  //        ^^^^^^^^^^^^^          ^^^^^^^^^
  // typesafe `to` and `params` based on the available routes in your app
  ```

  Check out our docs for more:
  - [_Explanations > Type Safety_](https://reactrouter.com/dev/guides/explanation/type-safety)
  - [_How-To > Setting up type safety_](https://reactrouter.com/dev/guides/how-to/setting-up-type-safety)

- Stabilize `unstable_dataStrategy` ([#11969](https://github.com/remix-run/react-router/pull/11969))

- Stabilize `unstable_patchRoutesOnNavigation` ([#11970](https://github.com/remix-run/react-router/pull/11970))

### Patch Changes

- No changes ([`506329c4e`](https://github.com/remix-run/react-router/commit/506329c4e2e7aba9837cbfa44df6103b49423745))

- chore: re-enable development warnings through a `development` exports condition. ([#12269](https://github.com/remix-run/react-router/pull/12269))

- Remove unstable upload handler. ([#12015](https://github.com/remix-run/react-router/pull/12015))

- Remove unneeded dependency on @web3-storage/multipart-parser ([#12274](https://github.com/remix-run/react-router/pull/12274))

- Fix redirects returned from loaders/actions using `data()` ([#12021](https://github.com/remix-run/react-router/pull/12021))

- fix(react-router): (v7) fix static prerender of non-ascii characters ([#12161](https://github.com/remix-run/react-router/pull/12161))

- Replace `substr` with `substring` ([#12080](https://github.com/remix-run/react-router/pull/12080))

- Remove the deprecated `json` utility ([#12146](https://github.com/remix-run/react-router/pull/12146))
  - You can use [`Response.json`](https://developer.mozilla.org/en-US/docs/Web/API/Response/json_static) if you still need to construct JSON responses in your app

- Remove unneeded dependency on source-map ([#12275](https://github.com/remix-run/react-router/pull/12275))

## 6.28.0

### Minor Changes

- - Log deprecation warnings for v7 flags ([#11750](https://github.com/remix-run/react-router/pull/11750))
  - Add deprecation warnings to `json`/`defer` in favor of returning raw objects
    - These methods will be removed in React Router v7

### Patch Changes

- Update JSDoc URLs for new website structure (add /v6/ segment) ([#12141](https://github.com/remix-run/react-router/pull/12141))
- Updated dependencies:
  - `@remix-run/router@1.21.0`

## 6.27.0

### Minor Changes

- Stabilize `unstable_patchRoutesOnNavigation` ([#11973](https://github.com/remix-run/react-router/pull/11973))
  - Add new `PatchRoutesOnNavigationFunctionArgs` type for convenience ([#11967](https://github.com/remix-run/react-router/pull/11967))
- Stabilize `unstable_dataStrategy` ([#11974](https://github.com/remix-run/react-router/pull/11974))
- Stabilize the `unstable_flushSync` option for navigations and fetchers ([#11989](https://github.com/remix-run/react-router/pull/11989))
- Stabilize the `unstable_viewTransition` option for navigations and the corresponding `unstable_useViewTransitionState` hook ([#11989](https://github.com/remix-run/react-router/pull/11989))

### Patch Changes

- Fix bug when submitting to the current contextual route (parent route with an index child) when an `?index` param already exists from a prior submission ([#12003](https://github.com/remix-run/react-router/pull/12003))

- Fix `useFormAction` bug - when removing `?index` param it would not keep other non-Remix `index` params ([#12003](https://github.com/remix-run/react-router/pull/12003))

- Fix types for `RouteObject` within `PatchRoutesOnNavigationFunction`'s `patch` method so it doesn't expect agnostic route objects passed to `patch` ([#11967](https://github.com/remix-run/react-router/pull/11967))

- Updated dependencies:
  - `@remix-run/router@1.20.0`

## 6.26.2

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.19.2`

## 6.26.1

### Patch Changes

- Rename `unstable_patchRoutesOnMiss` to `unstable_patchRoutesOnNavigation` to match new behavior ([#11888](https://github.com/remix-run/react-router/pull/11888))
- Updated dependencies:
  - `@remix-run/router@1.19.1`

## 6.26.0

### Minor Changes

- Add a new `replace(url, init?)` alternative to `redirect(url, init?)` that performs a `history.replaceState` instead of a `history.pushState` on client-side navigation redirects ([#11811](https://github.com/remix-run/react-router/pull/11811))

### Patch Changes

- Fix initial hydration behavior when using `future.v7_partialHydration` along with `unstable_patchRoutesOnMiss` ([#11838](https://github.com/remix-run/react-router/pull/11838))
  - During initial hydration, `router.state.matches` will now include any partial matches so that we can render ancestor `HydrateFallback` components
- Updated dependencies:
  - `@remix-run/router@1.19.0`

## 6.25.1

No significant changes to this package were made in this release. [See the repo `CHANGELOG.md`](https://github.com/remix-run/react-router/blob/main/CHANGELOG.md) for an overview of all changes in v6.25.1.

## 6.25.0

### Minor Changes

- Stabilize `future.unstable_skipActionErrorRevalidation` as `future.v7_skipActionErrorRevalidation` ([#11769](https://github.com/remix-run/react-router/pull/11769))
  - When this flag is enabled, actions will not automatically trigger a revalidation if they return/throw a `Response` with a `4xx`/`5xx` status code
  - You may still opt-into revalidation via `shouldRevalidate`
  - This also changes `shouldRevalidate`'s `unstable_actionStatus` parameter to `actionStatus`

### Patch Changes

- Fix regression and properly decode paths inside `useMatch` so matches/params reflect decoded params ([#11789](https://github.com/remix-run/react-router/pull/11789))
- Updated dependencies:
  - `@remix-run/router@1.18.0`

## 6.24.1

### Patch Changes

- When using `future.v7_relativeSplatPath`, properly resolve relative paths in splat routes that are children of pathless routes ([#11633](https://github.com/remix-run/react-router/pull/11633))
- Updated dependencies:
  - `@remix-run/router@1.17.1`

## 6.24.0

### Minor Changes

- Add support for Lazy Route Discovery (a.k.a. Fog of War) ([#11626](https://github.com/remix-run/react-router/pull/11626))
  - RFC: <https://github.com/remix-run/react-router/discussions/11113>
  - `unstable_patchRoutesOnMiss` docs: <https://reactrouter.com/v6/routers/create-browser-router>

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.17.0`

## 6.23.1

### Patch Changes

- allow undefined to be resolved with `<Await>` ([#11513](https://github.com/remix-run/react-router/pull/11513))
- Updated dependencies:
  - `@remix-run/router@1.16.1`

## 6.23.0

### Minor Changes

- Add a new `unstable_dataStrategy` configuration option ([#11098](https://github.com/remix-run/react-router/pull/11098))
  - This option allows Data Router applications to take control over the approach for executing route loaders and actions
  - The default implementation is today's behavior, to fetch all loaders in parallel, but this option allows users to implement more advanced data flows including Remix single-fetch, middleware/context APIs, automatic loader caching, and more

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.16.0`

## 6.22.3

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.15.3`

## 6.22.2

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.15.2`

## 6.22.1

### Patch Changes

- Fix encoding/decoding issues with pre-encoded dynamic parameter values ([#11199](https://github.com/remix-run/react-router/pull/11199))
- Updated dependencies:
  - `@remix-run/router@1.15.1`

## 6.22.0

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.15.0`

## 6.21.3

### Patch Changes

- Remove leftover `unstable_` prefix from `Blocker`/`BlockerFunction` types ([#11187](https://github.com/remix-run/react-router/pull/11187))

## 6.21.2

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.14.2`

## 6.21.1

### Patch Changes

- Fix bug with `route.lazy` not working correctly on initial SPA load when `v7_partialHydration` is specified ([#11121](https://github.com/remix-run/react-router/pull/11121))
- Updated dependencies:
  - `@remix-run/router@1.14.1`

## 6.21.0

### Minor Changes

- Add a new `future.v7_relativeSplatPath` flag to implement a breaking bug fix to relative routing when inside a splat route. ([#11087](https://github.com/remix-run/react-router/pull/11087))

  This fix was originally added in [#10983](https://github.com/remix-run/react-router/issues/10983) and was later reverted in [#11078](https://github.com/remix-run/react-router/pull/11078) because it was determined that a large number of existing applications were relying on the buggy behavior (see [#11052](https://github.com/remix-run/react-router/issues/11052))

  **The Bug**
  The buggy behavior is that without this flag, the default behavior when resolving relative paths is to _ignore_ any splat (`*`) portion of the current route path.

  **The Background**
  This decision was originally made thinking that it would make the concept of nested different sections of your apps in `<Routes>` easier if relative routing would _replace_ the current splat:

  ```jsx
  <BrowserRouter>
    <Routes>
      <Route path="/" element={<Home />} />
      <Route path="dashboard/*" element={<Dashboard />} />
    </Routes>
  </BrowserRouter>
  ```

  Any paths like `/dashboard`, `/dashboard/team`, `/dashboard/projects` will match the `Dashboard` route. The dashboard component itself can then render nested `<Routes>`:

  ```jsx
  function Dashboard() {
    return (
      <div>
        <h2>Dashboard</h2>
        <nav>
          <Link to="/">Dashboard Home</Link>
          <Link to="team">Team</Link>
          <Link to="projects">Projects</Link>
        </nav>

        <Routes>
          <Route path="/" element={<DashboardHome />} />
          <Route path="team" element={<DashboardTeam />} />
          <Route path="projects" element={<DashboardProjects />} />
        </Routes>
      </div>
    );
  }
  ```

  Now, all links and route paths are relative to the router above them. This makes code splitting and compartmentalizing your app really easy. You could render the `Dashboard` as its own independent app, or embed it into your large app without making any changes to it.

  **The Problem**

  The problem is that this concept of ignoring part of a path breaks a lot of other assumptions in React Router - namely that `"."` always means the current location pathname for that route. When we ignore the splat portion, we start getting invalid paths when using `"."`:

  ```jsx
  // If we are on URL /dashboard/team, and we want to link to /dashboard/team:
  function DashboardTeam() {
    // ❌ This is broken and results in <a href="/dashboard">
    return <Link to=".">A broken link to the Current URL</Link>;

    // ✅ This is fixed but super unintuitive since we're already at /dashboard/team!
    return <Link to="./team">A broken link to the Current URL</Link>;
  }
  ```

  We've also introduced an issue that we can no longer move our `DashboardTeam` component around our route hierarchy easily - since it behaves differently if we're underneath a non-splat route, such as `/dashboard/:widget`. Now, our `"."` links will, properly point to ourself _inclusive of the dynamic param value_ so behavior will break from it's corresponding usage in a `/dashboard/*` route.

  Even worse, consider a nested splat route configuration:

  ```jsx
  <BrowserRouter>
    <Routes>
      <Route path="dashboard">
        <Route path="*" element={<Dashboard />} />
      </Route>
    </Routes>
  </BrowserRouter>
  ```

  Now, a `<Link to=".">` and a `<Link to="..">` inside the `Dashboard` component go to the same place! That is definitely not correct!

  Another common issue arose in Data Routers (and Remix) where any `<Form>` should post to it's own route `action` if you the user doesn't specify a form action:

  ```jsx
  let router = createBrowserRouter({
    path: "/dashboard",
    children: [
      {
        path: "*",
        action: dashboardAction,
        Component() {
          // ❌ This form is broken!  It throws a 405 error when it submits because
          // it tries to submit to /dashboard (without the splat value) and the parent
          // `/dashboard` route doesn't have an action
          return <Form method="post">...</Form>;
        },
      },
    ],
  });
  ```

  This is just a compounded issue from the above because the default location for a `Form` to submit to is itself (`"."`) - and if we ignore the splat portion, that now resolves to the parent route.

  **The Solution**
  If you are leveraging this behavior, it's recommended to enable the future flag, move your splat to it's own route, and leverage `../` for any links to "sibling" pages:

  ```jsx
  <BrowserRouter>
    <Routes>
      <Route path="dashboard">
        <Route index path="*" element={<Dashboard />} />
      </Route>
    </Routes>
  </BrowserRouter>

  function Dashboard() {
    return (
      <div>
        <h2>Dashboard</h2>
        <nav>
          <Link to="..">Dashboard Home</Link>
          <Link to="../team">Team</Link>
          <Link to="../projects">Projects</Link>
        </nav>

        <Routes>
          <Route path="/" element={<DashboardHome />} />
          <Route path="team" element={<DashboardTeam />} />
          <Route path="projects" element={<DashboardProjects />} />
        </Router>
      </div>
    );
  }
  ```

  This way, `.` means "the full current pathname for my route" in all cases (including static, dynamic, and splat routes) and `..` always means "my parents pathname".

### Patch Changes

- Properly handle falsy error values in ErrorBoundary's ([#11071](https://github.com/remix-run/react-router/pull/11071))
- Updated dependencies:
  - `@remix-run/router@1.14.0`

## 6.20.1

### Patch Changes

- Revert the `useResolvedPath` fix for splat routes due to a large number of applications that were relying on the buggy behavior (see <https://github.com/remix-run/react-router/issues/11052#issuecomment-1836589329>). We plan to re-introduce this fix behind a future flag in the next minor version. ([#11078](https://github.com/remix-run/react-router/pull/11078))
- Updated dependencies:
  - `@remix-run/router@1.13.1`

## 6.20.0

### Minor Changes

- Export the `PathParam` type from the public API ([#10719](https://github.com/remix-run/react-router/pull/10719))

### Patch Changes

- Fix bug with `resolveTo` in splat routes ([#11045](https://github.com/remix-run/react-router/pull/11045))
  - This is a follow up to [#10983](https://github.com/remix-run/react-router/pull/10983) to handle the few other code paths using `getPathContributingMatches`
  - This removes the `UNSAFE_getPathContributingMatches` export from `@remix-run/router` since we no longer need this in the `react-router`/`react-router-dom` layers
- Updated dependencies:
  - `@remix-run/router@1.13.0`

## 6.19.0

### Minor Changes

- Add `unstable_flushSync` option to `useNavigate`/`useSumbit`/`fetcher.load`/`fetcher.submit` to opt-out of `React.startTransition` and into `ReactDOM.flushSync` for state updates ([#11005](https://github.com/remix-run/react-router/pull/11005))
- Remove the `unstable_` prefix from the [`useBlocker`](https://reactrouter.com/v6/hooks/use-blocker) hook as it's been in use for enough time that we are confident in the API. We do not plan to remove the prefix from `unstable_usePrompt` due to differences in how browsers handle `window.confirm` that prevent React Router from guaranteeing consistent/correct behavior. ([#10991](https://github.com/remix-run/react-router/pull/10991))

### Patch Changes

- Fix `useActionData` so it returns proper contextual action data and not _any_ action data in the tree ([#11023](https://github.com/remix-run/react-router/pull/11023))

- Fix bug in `useResolvedPath` that would cause `useResolvedPath(".")` in a splat route to lose the splat portion of the URL path. ([#10983](https://github.com/remix-run/react-router/pull/10983))
  - ⚠️ This fixes a quite long-standing bug specifically for `"."` paths inside a splat route which incorrectly dropped the splat portion of the URL. If you are relative routing via `"."` inside a splat route in your application you should double check that your logic is not relying on this buggy behavior and update accordingly.

- Updated dependencies:
  - `@remix-run/router@1.12.0`

## 6.18.0

### Patch Changes

- Fix the `future` prop on `BrowserRouter`, `HashRouter` and `MemoryRouter` so that it accepts a `Partial<FutureConfig>` instead of requiring all flags to be included. ([#10962](https://github.com/remix-run/react-router/pull/10962))
- Updated dependencies:
  - `@remix-run/router@1.11.0`

## 6.17.0

### Patch Changes

- Fix `RouterProvider` `future` prop type to be a `Partial<FutureConfig>` so that not all flags must be specified ([#10900](https://github.com/remix-run/react-router/pull/10900))
- Updated dependencies:
  - `@remix-run/router@1.10.0`

## 6.16.0

### Minor Changes

- In order to move towards stricter TypeScript support in the future, we're aiming to replace current usages of `any` with `unknown` on exposed typings for user-provided data. To do this in Remix v2 without introducing breaking changes in React Router v6, we have added generics to a number of shared types. These continue to default to `any` in React Router and are overridden with `unknown` in Remix. In React Router v7 we plan to move these to `unknown` as a breaking change. ([#10843](https://github.com/remix-run/react-router/pull/10843))
  - `Location` now accepts a generic for the `location.state` value
  - `ActionFunctionArgs`/`ActionFunction`/`LoaderFunctionArgs`/`LoaderFunction` now accept a generic for the `context` parameter (only used in SSR usages via `createStaticHandler`)
  - The return type of `useMatches` (now exported as `UIMatch`) accepts generics for `match.data` and `match.handle` - both of which were already set to `unknown`
- Move the `@private` class export `ErrorResponse` to an `UNSAFE_ErrorResponseImpl` export since it is an implementation detail and there should be no construction of `ErrorResponse` instances in userland. This frees us up to export a `type ErrorResponse` which correlates to an instance of the class via `InstanceType`. Userland code should only ever be using `ErrorResponse` as a type and should be type-narrowing via `isRouteErrorResponse`. ([#10811](https://github.com/remix-run/react-router/pull/10811))
- Export `ShouldRevalidateFunctionArgs` interface ([#10797](https://github.com/remix-run/react-router/pull/10797))
- Removed private/internal APIs only required for the Remix v1 backwards compatibility layer and no longer needed in Remix v2 (`_isFetchActionRedirect`, `_hasFetcherDoneAnything`) ([#10715](https://github.com/remix-run/react-router/pull/10715))

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.9.0`

## 6.15.0

### Minor Changes

- Add's a new `redirectDocument()` function which allows users to specify that a redirect from a `loader`/`action` should trigger a document reload (via `window.location`) instead of attempting to navigate to the redirected location via React Router ([#10705](https://github.com/remix-run/react-router/pull/10705))

### Patch Changes

- Ensure `useRevalidator` is referentially stable across re-renders if revalidations are not actively occurring ([#10707](https://github.com/remix-run/react-router/pull/10707))
- Updated dependencies:
  - `@remix-run/router@1.8.0`

## 6.14.2

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.7.2`

## 6.14.1

### Patch Changes

- Fix loop in `unstable_useBlocker` when used with an unstable blocker function ([#10652](https://github.com/remix-run/react-router/pull/10652))
- Fix issues with reused blockers on subsequent navigations ([#10656](https://github.com/remix-run/react-router/pull/10656))
- Updated dependencies:
  - `@remix-run/router@1.7.1`

## 6.14.0

### Patch Changes

- Strip `basename` from locations provided to `unstable_useBlocker` functions to match `useLocation` ([#10573](https://github.com/remix-run/react-router/pull/10573))
- Fix `generatePath` when passed a numeric `0` value parameter ([#10612](https://github.com/remix-run/react-router/pull/10612))
- Fix `unstable_useBlocker` key issues in `StrictMode` ([#10573](https://github.com/remix-run/react-router/pull/10573))
- Fix `tsc --skipLibCheck:false` issues on React 17 ([#10622](https://github.com/remix-run/react-router/pull/10622))
- Upgrade `typescript` to 5.1 ([#10581](https://github.com/remix-run/react-router/pull/10581))
- Updated dependencies:
  - `@remix-run/router@1.7.0`

## 6.13.0

### Minor Changes

- Move [`React.startTransition`](https://react.dev/reference/react/startTransition) usage behind a [future flag](https://reactrouter.com/v6/guides/api-development-strategy) to avoid issues with existing incompatible `Suspense` usages. We recommend folks adopting this flag to be better compatible with React concurrent mode, but if you run into issues you can continue without the use of `startTransition` until v7. Issues usually boils down to creating net-new promises during the render cycle, so if you run into issues you should either lift your promise creation out of the render cycle or put it behind a `useMemo`. ([#10596](https://github.com/remix-run/react-router/pull/10596))

  Existing behavior will no longer include `React.startTransition`:

  ```jsx
  <BrowserRouter>
    <Routes>{/*...*/}</Routes>
  </BrowserRouter>

  <RouterProvider router={router} />
  ```

  If you wish to enable `React.startTransition`, pass the future flag to your component:

  ```jsx
  <BrowserRouter future={{ v7_startTransition: true }}>
    <Routes>{/*...*/}</Routes>
  </BrowserRouter>

  <RouterProvider router={router} future={{ v7_startTransition: true }}/>
  ```

### Patch Changes

- Work around webpack/terser `React.startTransition` minification bug in production mode ([#10588](https://github.com/remix-run/react-router/pull/10588))

## 6.12.1

> \[!WARNING]
> Please use version `6.13.0` or later instead of `6.12.1`. This version suffers from a `webpack`/`terser` minification issue resulting in invalid minified code in your resulting production bundles which can cause issues in your application. See [#10579](https://github.com/remix-run/react-router/issues/10579) for more details.

### Patch Changes

- Adjust feature detection of `React.startTransition` to fix webpack + react 17 compilation error ([#10569](https://github.com/remix-run/react-router/pull/10569))

## 6.12.0

### Minor Changes

- Wrap internal router state updates with `React.startTransition` if it exists ([#10438](https://github.com/remix-run/react-router/pull/10438))

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.6.3`

## 6.11.2

### Patch Changes

- Fix `basename` duplication in descendant `<Routes>` inside a `<RouterProvider>` ([#10492](https://github.com/remix-run/react-router/pull/10492))
- Updated dependencies:
  - `@remix-run/router@1.6.2`

## 6.11.1

### Patch Changes

- Fix usage of `Component` API within descendant `<Routes>` ([#10434](https://github.com/remix-run/react-router/pull/10434))
- Fix bug when calling `useNavigate` from `<Routes>` inside a `<RouterProvider>` ([#10432](https://github.com/remix-run/react-router/pull/10432))
- Fix usage of `<Navigate>` in strict mode when using a data router ([#10435](https://github.com/remix-run/react-router/pull/10435))
- Updated dependencies:
  - `@remix-run/router@1.6.1`

## 6.11.0

### Patch Changes

- Log loader/action errors to the console in dev for easier stack trace evaluation ([#10286](https://github.com/remix-run/react-router/pull/10286))
- Fix bug preventing rendering of descendant `<Routes>` when `RouterProvider` errors existed ([#10374](https://github.com/remix-run/react-router/pull/10374))
- Fix inadvertent re-renders when using `Component` instead of `element` on a route definition ([#10287](https://github.com/remix-run/react-router/pull/10287))
- Fix detection of `useNavigate` in the render cycle by setting the `activeRef` in a layout effect, allowing the `navigate` function to be passed to child components and called in a `useEffect` there. ([#10394](https://github.com/remix-run/react-router/pull/10394))
- Switched from `useSyncExternalStore` to `useState` for internal `@remix-run/router` router state syncing in `<RouterProvider>`. We found some [subtle bugs](https://codesandbox.io/s/use-sync-external-store-loop-9g7b81) where router state updates got propagated _before_ other normal `useState` updates, which could lead to footguns in `useEffect` calls. ([#10377](https://github.com/remix-run/react-router/pull/10377), [#10409](https://github.com/remix-run/react-router/pull/10409))
- Allow `useRevalidator()` to resolve a loader-driven error boundary scenario ([#10369](https://github.com/remix-run/react-router/pull/10369))
- Avoid unnecessary unsubscribe/resubscribes on router state changes ([#10409](https://github.com/remix-run/react-router/pull/10409))
- When using a `RouterProvider`, `useNavigate`/`useSubmit`/`fetcher.submit` are now stable across location changes, since we can handle relative routing via the `@remix-run/router` instance and get rid of our dependence on `useLocation()`. When using `BrowserRouter`, these hooks remain unstable across location changes because they still rely on `useLocation()`. ([#10336](https://github.com/remix-run/react-router/pull/10336))
- Updated dependencies:
  - `@remix-run/router@1.6.0`

## 6.10.0

### Minor Changes

- Added support for [**Future Flags**](https://reactrouter.com/v6/guides/api-development-strategy) in React Router. The first flag being introduced is `future.v7_normalizeFormMethod` which will normalize the exposed `useNavigation()/useFetcher()` `formMethod` fields as uppercase HTTP methods to align with the `fetch()` behavior. ([#10207](https://github.com/remix-run/react-router/pull/10207))
  - When `future.v7_normalizeFormMethod === false` (default v6 behavior),
    - `useNavigation().formMethod` is lowercase
    - `useFetcher().formMethod` is lowercase
  - When `future.v7_normalizeFormMethod === true`:
    - `useNavigation().formMethod` is uppercase
    - `useFetcher().formMethod` is uppercase

### Patch Changes

- Fix route ID generation when using Fragments in `createRoutesFromElements` ([#10193](https://github.com/remix-run/react-router/pull/10193))
- Updated dependencies:
  - `@remix-run/router@1.5.0`

## 6.9.0

### Minor Changes

- React Router now supports an alternative way to define your route `element` and `errorElement` fields as React Components instead of React Elements. You can instead pass a React Component to the new `Component` and `ErrorBoundary` fields if you choose. There is no functional difference between the two, so use whichever approach you prefer 😀. You shouldn't be defining both, but if you do `Component`/`ErrorBoundary` will "win". ([#10045](https://github.com/remix-run/react-router/pull/10045))

  **Example JSON Syntax**

  ```jsx
  // Both of these work the same:
  const elementRoutes = [{
    path: '/',
    element: <Home />,
    errorElement: <HomeError />,
  }]

  const componentRoutes = [{
    path: '/',
    Component: Home,
    ErrorBoundary: HomeError,
  }]

  function Home() { ... }
  function HomeError() { ... }
  ```

  **Example JSX Syntax**

  ```jsx
  // Both of these work the same:
  const elementRoutes = createRoutesFromElements(
    <Route path='/' element={<Home />} errorElement={<HomeError /> } />
  );

  const componentRoutes = createRoutesFromElements(
    <Route path='/' Component={Home} ErrorBoundary={HomeError} />
  );

  function Home() { ... }
  function HomeError() { ... }
  ```

- **Introducing Lazy Route Modules!** ([#10045](https://github.com/remix-run/react-router/pull/10045))

  In order to keep your application bundles small and support code-splitting of your routes, we've introduced a new `lazy()` route property. This is an async function that resolves the non-route-matching portions of your route definition (`loader`, `action`, `element`/`Component`, `errorElement`/`ErrorBoundary`, `shouldRevalidate`, `handle`).

  Lazy routes are resolved on initial load and during the `loading` or `submitting` phase of a navigation or fetcher call. You cannot lazily define route-matching properties (`path`, `index`, `children`) since we only execute your lazy route functions after we've matched known routes.

  Your `lazy` functions will typically return the result of a dynamic import.

  ```jsx
  // In this example, we assume most folks land on the homepage so we include that
  // in our critical-path bundle, but then we lazily load modules for /a and /b so
  // they don't load until the user navigates to those routes
  let routes = createRoutesFromElements(
    <Route path="/" element={<Layout />}>
      <Route index element={<Home />} />
      <Route path="a" lazy={() => import("./a")} />
      <Route path="b" lazy={() => import("./b")} />
    </Route>,
  );
  ```

  Then in your lazy route modules, export the properties you want defined for the route:

  ```jsx
  export async function loader({ request }) {
    let data = await fetchData(request);
    return json(data);
  }

  // Export a `Component` directly instead of needing to create a React Element from it
  export function Component() {
    let data = useLoaderData();

    return (
      <>
        <h1>You made it!</h1>
        <p>{data}</p>
      </>
    );
  }

  // Export an `ErrorBoundary` directly instead of needing to create a React Element from it
  export function ErrorBoundary() {
    let error = useRouteError();
    return isRouteErrorResponse(error) ? (
      <h1>
        {error.status} {error.statusText}
      </h1>
    ) : (
      <h1>{error.message || error}</h1>
    );
  }
  ```

  An example of this in action can be found in the [`examples/lazy-loading-router-provider`](https://github.com/remix-run/react-router/tree/main/examples/lazy-loading-router-provider) directory of the repository.

  🙌 Huge thanks to @rossipedia for the [Initial Proposal](https://github.com/remix-run/react-router/discussions/9826) and [POC Implementation](https://github.com/remix-run/react-router/pull/9830).

- Updated dependencies:
  - `@remix-run/router@1.4.0`

### Patch Changes

- Fix `generatePath` incorrectly applying parameters in some cases ([#10078](https://github.com/remix-run/react-router/pull/10078))
- Improve memoization for context providers to avoid unnecessary re-renders ([#9983](https://github.com/remix-run/react-router/pull/9983))

## 6.8.2

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.3.3`

## 6.8.1

### Patch Changes

- Remove inaccurate console warning for POP navigations and update active blocker logic ([#10030](https://github.com/remix-run/react-router/pull/10030))
- Updated dependencies:
  - `@remix-run/router@1.3.2`

## 6.8.0

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.3.1`

## 6.7.0

### Minor Changes

- Add `unstable_useBlocker` hook for blocking navigations within the app's location origin ([#9709](https://github.com/remix-run/react-router/pull/9709))

### Patch Changes

- Fix `generatePath` when optional params are present ([#9764](https://github.com/remix-run/react-router/pull/9764))
- Update `<Await>` to accept `ReactNode` as children function return result ([#9896](https://github.com/remix-run/react-router/pull/9896))
- Updated dependencies:
  - `@remix-run/router@1.3.0`

## 6.6.2

### Patch Changes

- Ensure `useId` consistency during SSR ([#9805](https://github.com/remix-run/react-router/pull/9805))

## 6.6.1

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.2.1`

## 6.6.0

### Patch Changes

- Prevent `useLoaderData` usage in `errorElement` ([#9735](https://github.com/remix-run/react-router/pull/9735))
- Updated dependencies:
  - `@remix-run/router@1.2.0`

## 6.5.0

This release introduces support for [Optional Route Segments](https://github.com/remix-run/react-router/issues/9546). Now, adding a `?` to the end of any path segment will make that entire segment optional. This works for both static segments and dynamic parameters.

**Optional Params Examples**

- `<Route path=":lang?/about>` will match:
  - `/:lang/about`
  - `/about`
- `<Route path="/multistep/:widget1?/widget2?/widget3?">` will match:
  - `/multistep`
  - `/multistep/:widget1`
  - `/multistep/:widget1/:widget2`
  - `/multistep/:widget1/:widget2/:widget3`

**Optional Static Segment Example**

- `<Route path="/home?">` will match:
  - `/`
  - `/home`
- `<Route path="/fr?/about">` will match:
  - `/about`
  - `/fr/about`

### Minor Changes

- Allows optional routes and optional static segments ([#9650](https://github.com/remix-run/react-router/pull/9650))

### Patch Changes

- Stop incorrectly matching on partial named parameters, i.e. `<Route path="prefix-:param">`, to align with how splat parameters work. If you were previously relying on this behavior then it's recommended to extract the static portion of the path at the `useParams` call site: ([#9506](https://github.com/remix-run/react-router/pull/9506))

```jsx
// Old behavior at URL /prefix-123
<Route path="prefix-:id" element={<Comp /> }>

function Comp() {
  let params = useParams(); // { id: '123' }
  let id = params.id; // "123"
  ...
}

// New behavior at URL /prefix-123
<Route path=":id" element={<Comp /> }>

function Comp() {
  let params = useParams(); // { id: 'prefix-123' }
  let id = params.id.replace(/^prefix-/, ''); // "123"
  ...
}
```

- Updated dependencies:
  - `@remix-run/router@1.1.0`

## 6.4.5

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.0.5`

## 6.4.4

### Patch Changes

- Updated dependencies:
  - `@remix-run/router@1.0.4`

## 6.4.3

### Patch Changes

- `useRoutes` should be able to return `null` when passing `locationArg` ([#9485](https://github.com/remix-run/react-router/pull/9485))
- fix `initialEntries` type in `createMemoryRouter` ([#9498](https://github.com/remix-run/react-router/pull/9498))
- Updated dependencies:
  - `@remix-run/router@1.0.3`

## 6.4.2

### Patch Changes

- Fix `IndexRouteObject` and `NonIndexRouteObject` types to make `hasErrorElement` optional ([#9394](https://github.com/remix-run/react-router/pull/9394))
- Enhance console error messages for invalid usage of data router hooks ([#9311](https://github.com/remix-run/react-router/pull/9311))
- If an index route has children, it will result in a runtime error. We have strengthened our `RouteObject`/`RouteProps` types to surface the error in TypeScript. ([#9366](https://github.com/remix-run/react-router/pull/9366))
- Updated dependencies:
  - `@remix-run/router@1.0.2`

## 6.4.1

### Patch Changes

- Preserve state from `initialEntries` ([#9288](https://github.com/remix-run/react-router/pull/9288))
- Updated dependencies:
  - `@remix-run/router@1.0.1`

## 6.4.0

Whoa this is a big one! `6.4.0` brings all the data loading and mutation APIs over from Remix. Here's a quick high level overview, but it's recommended you go check out the [docs](https://reactrouter.com), especially the [feature overview](https://reactrouter.com/en/6.4.0/start/overview) and the [tutorial](https://reactrouter.com/en/6.4.0/start/tutorial).

**New APIs**

- Create your router with `createMemoryRouter`
- Render your router with `<RouterProvider>`
- Load data with a Route `loader` and mutate with a Route `action`
- Handle errors with Route `errorElement`
- Defer non-critical data with `defer` and `Await`

**Bug Fixes**

- Path resolution is now trailing slash agnostic (#8861)
- `useLocation` returns the scoped location inside a `<Routes location>` component (#9094)

**Updated Dependencies**

- `@remix-run/router@1.0.0`