Fix duplicated route module code

Author: markdalgleish

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

@@ -309,10 +309,12 @@ export function reactRouterRSCVitePlugin(): Vite.PluginOption[] {
     {
       name: "react-router/rsc/virtual-route-modules",
       transform(code, id) {
+        if (!routeIdByFile) return;
         return transformVirtualRouteModules({
           code,
           id,
           viteCommand,
+          routeIdByFile,
           rootRouteFile: config.unstable_rootRouteFile,
           viteEnvironment: this.environment,
         });

packages/react-router-dev/vite/rsc/virtual-route-modules.ts

@@ -96,16 +96,18 @@ export function transformVirtualRouteModules({
   id,
   code,
   viteCommand,
+  routeIdByFile,
   rootRouteFile,
   viteEnvironment,
 }: {
   id: string;
   code: string;
   viteCommand: ViteCommand;
+  routeIdByFile: Map<string, string>;
   rootRouteFile: string;
   viteEnvironment: Vite.Environment;
 }) {
-  if (isVirtualRouteModuleId(id)) {
+  if (isVirtualRouteModuleId(id) || routeIdByFile.has(id)) {
     return createVirtualRouteModuleCode({
       id,
       code,