Refactor MIME type helper function and move outside server block

server.ts

@@ -1,39 +1,38 @@
 // server.ts
 
+// Helper function to get MIME type
+function getMimeType(filename: string): string {
+  switch (filename.split(".").pop()?.toLowerCase()) {
+    case "js":
+      return "application/javascript";
+    case "ts":
+      return "application/javascript";
+    case "css":
+      return "text/css";
+    case "html":
+      return "text/html";
+    case "json":
+      return "application/json";
+    case "png":
+      return "image/png";
+    case "jpg":
+    case "jpeg":
+      return "image/jpeg";
+    case "svg":
+      return "image/svg+xml";
+    case "ico":
+      return "image/x-icon";
+    default:
+      return "text/plain";
+  }
+}
+
 const server = Bun.serve({
   port: 5173,
   async fetch(req) {
     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":
-          return "application/javascript";
-        case "css":
-          return "text/css";
-        case "html":
-          return "text/html";
-        case "json":
-          return "application/json";
-        case "png":
-          return "image/png";
-        case "jpg":
-        case "jpeg":
-          return "image/jpeg";
-        case "svg":
-          return "image/svg+xml";
-        case "ico":
-          return "image/x-icon";
-        default:
-          return "text/plain";
-      }
-    }
-
     // Serve root as index.html
     if (pathname === "/")
       try {
@@ -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) {