react app init

1 files changed, 15 insertions, 0 deletions

diff --git a/my-app/src/reportWebVitals.ts b/my-app/src/reportWebVitals.ts
new file mode 100644
index 0000000..49a2a16
--- /dev/null
+++ b/my-app/src/reportWebVitals.ts
@@ -0,0 +1,15 @@
+import { ReportHandler } from 'web-vitals';
+
+const reportWebVitals = (onPerfEntry?: ReportHandler) => {
+  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;