adding basic asynchrounous code here

backend/3.lecture/src/utils/ApiError.js

@@ -0,0 +1,7 @@
+class ApiError extends Error{
+    constructor(statusCode, message){
+        super();
+        this.statusCode = statusCode;
+        this.message = message;
+    }
+}

backend/3.lecture/src/utils/asyncHandler.js

@@ -1,5 +1,21 @@
-const asyncHandler = () =>{
+/*const asyncHandler = () =>{
+    try{
+        await fn(req, res, next)
+    }
+    catch(error){
+        res.status(err.code || 500).json({
+            success: false,
+            message: err.message
+        })
+    }
+}*/
 
+const asyncHandler = (requestHandler) =>{
+    (req, res, next) =>{
+        Promise.resolve(requestHandler(req, res, next)).catch(next)
+
+    }
 }
 
-export {asyncHandler}
+
+export {asyncHandler}