PR-687356: Updating packages and adding support to HMR to server also.

src/@types/index.d.ts

@@ -2,3 +2,10 @@ declare module '*.svg' {
     const content: any;
     export default content;
 }
+
+declare const module: {
+    hot?: {
+      accept(dep?: string, callback?: () => void): void;
+      dispose(callback: () => void): void;
+    };
+};

src/server/server.tsx

@@ -131,6 +131,19 @@ const renderApp = (req, res, next) => {
 app
 	.get('/{*splat}', renderApp);
 
-app.listen(PORT, () => {
+const server = app.listen(PORT, () => {
 	console.log(`Server running on port ${PORT}`);
 });
+
+// --- HMR Support ---
+if (module.hot) {
+	module.hot.accept();
+	module.hot.dispose(() => {
+		console.log('🔁 [HMR] Disposing backend module...');
+		if (server) {
+			server.close(() => {
+				console.log('🛑 Server closed due to HMR');
+			});
+		}
+	});
+}