reportWebVitals

client/src/index.js

@@ -2,7 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import './index.css';
 import App from './App';
-import reportWebVitals from './reportWebVitals';
+import reportWebVitals from "./reportWebVitals"
 
 ReactDOM.render(
   <React.StrictMode>

client/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = (onPerfEntry) => {
+    if (onPerfEntry && onPerfEntry instanceof Function) {
+        import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+            getCLS(onPerfEntry);
+            getFID(onPerfEntry);
+            getFCP(onPerfEntry);
+            getLCP(onPerfEntry);
+            getTTFB(onPerfEntry);
+        });
+    }
+};
+
+export default reportWebVitals;