Refactor MIME type helper function and move outside server block

server.ts

@@ -1,15 +1,8 @@
 // server.ts
 
-const server = Bun.serve({
+// Helper function to get MIME type
-  port: 5173,
+function getMimeType(filename: string): string {
-  async fetch(req) {
+  switch (filename.split(".").pop()?.toLowerCase()) {
-    const url = new URL(req.url);
-    const pathname = url.pathname;
-
-    // Helper function to get MIME type
-    function getMimeType(filename: string): string {
-      const ext = filename.split(".").pop()?.toLowerCase();
-      switch (ext) {
     case "js":
       return "application/javascript";
     case "ts":
@@ -32,7 +25,13 @@ const server = Bun.serve({
     default:
       return "text/plain";
   }
-    }
+}
+
+const server = Bun.serve({
+  port: 5173,
+  async fetch(req) {
+    const url = new URL(req.url);
+    const pathname = url.pathname;
 
     // Serve root as index.html
     if (pathname === "/")
@@ -56,11 +55,9 @@ const server = Bun.serve({
       if (!exists)
         return new Response(`File not found: ${filename}`, { status: 404 });
 
-      const mimeType = getMimeType(filename);
-
       return new Response(file, {
         headers: {
-          "Content-Type": mimeType,
+          "Content-Type": getMimeType(filename),
         },
       });
     } catch (error) {