[TS] Renamed file extensions to typescript

lib/routes/react-route.ts

@@ -0,0 +1,8 @@
+import express, { Router } from "express";
+import path from "path";
+const router = Router();
+router.use("/", express.static(path.resolve("./build")));
+router.get("/*", (req, res) =>
+  res.sendFile(path.resolve("./build/index.html")),
+);
+export default router;