Remove resolved unstable_rootRoute config

Author: markdalgleish

integration/vite-presets-test.ts

@@ -226,7 +226,6 @@ test.describe("Vite / presets", async () => {
         "serverBundles",
         "serverModuleFormat",
         "ssr",
-        "unstable_rootRouteFile",
         "unstable_routeConfig",
       ]);
 

packages/react-router-dev/config/config.ts

@@ -264,10 +264,6 @@ export type ResolvedReactRouterConfig = Readonly<{
    * SPA without server-rendering. Default's to `true`.
    */
   ssr: boolean;
-  /**
-   * The absolute path to the root route file.
-   */
-  unstable_rootRouteFile: string;
   /**
    * The resolved array of route config entries exported from `routes.ts`
    */
@@ -615,7 +611,6 @@ async function resolveConfig({
     serverBundles,
     serverModuleFormat,
     ssr,
-    unstable_rootRouteFile: rootRouteFile,
     unstable_routeConfig: routeConfig,
   } satisfies ResolvedReactRouterConfig);
 

packages/react-router-dev/vite/rsc/plugin.ts

@@ -315,7 +315,7 @@ export function reactRouterRSCVitePlugin(): Vite.PluginOption[] {
           id,
           viteCommand,
           routeIdByFile,
-          rootRouteFile: config.unstable_rootRouteFile,
+          rootRouteFile: config.routes.root.file,
           viteEnvironment: this.environment,
         });
       },