Use @remix-run/node-fetch-server in dev server

.changeset/use-remix-node-fetch-server.md

@@ -0,0 +1,5 @@
+---
+"rsbuild-plugin-react-router": patch
+---
+
+Use `@remix-run/node-fetch-server` for the built-in dev server middleware to reduce direct reliance on `@mjackson/node-fetch-server`.

package.json

@@ -70,6 +70,7 @@
     "@babel/traverse": "^7.28.6",
     "@babel/types": "^7.28.6",
     "@react-router/node": "^7.13.0",
+    "@remix-run/node-fetch-server": "^0.13.0",
     "@rspack/plugin-react-refresh": "^1.6.0",
     "babel-dead-code-elimination": "^1.0.12",
     "esbuild": "^0.27.2",
@@ -89,15 +90,15 @@
     "@rsbuild/core": "1.7.2",
     "@rslib/core": "^0.19.3",
     "@rspack/core": "1.7.4",
+    "@rstest/core": "^0.8.1",
+    "@rstest/coverage-istanbul": "^0.2.0",
     "@types/babel__core": "^7.20.5",
     "@types/babel__generator": "^7.27.0",
     "@types/babel__traverse": "^7.28.0",
     "@types/fs-extra": "11.0.4",
     "@types/jsesc": "^3.0.3",
     "@types/node": "^25.0.10",
     "@types/react": "^19.2.10",
-    "@rstest/core": "^0.8.1",
-    "@rstest/coverage-istanbul": "^0.2.0",
     "@types/react-dom": "^19.2.3",
     "es-module-lexer": "1.7.0",
     "kill-port": "^2.0.1",

src/dev-server.ts

@@ -35,10 +35,30 @@ export const createDevServerMiddleware = (server: any): DevServerMiddleware => {
         throw new Error('Server bundle not found or invalid');
       }
 
-      const { createRequestListener } = await import('@react-router/node');
+      // Use the modern request listener implementation directly to reduce
+      // our reliance on the deprecated `@mjackson/node-fetch-server` package.
+      const rr = await import('react-router');
+      const nfs = await import('@remix-run/node-fetch-server');
+      if (typeof rr.createRequestHandler !== 'function') {
+        throw new Error(
+          '[rsbuild-plugin-react-router] Missing `createRequestHandler` export from `react-router`'
+        );
+      }
+      if (typeof nfs.createRequestListener !== 'function') {
+        throw new Error(
+          '[rsbuild-plugin-react-router] Missing `createRequestListener` export from `@remix-run/node-fetch-server`'
+        );
+      }
       const normalizedBuild = normalizeBuildModule(bundle);
       const build = await resolveBuildExports(normalizedBuild);
-      const listener = createRequestListener({ build });
+      const requestHandler = rr.createRequestHandler(build, 'development');
+      // `createRequestListener` provides `client` info but React Router's
+      // request handler expects an app-defined `loadContext` object.
+      // For the built-in dev middleware we don't currently provide a load
+      // context, so pass `undefined`.
+      const listener = nfs.createRequestListener((request) =>
+        requestHandler(request)
+      );
       await listener(req, res);
     } catch (error) {
       console.error('SSR Error:', error);