guarantee called once

vercel · Sep 23, 2021 · ce661fb · ce661fb
1 parent dc7df16
commit ce661fb
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/packages/next/vitals/vitals.ts b/packages/next/vitals/vitals.ts
@@ -15,11 +15,13 @@ export function useWebVitalsReport(callback: ReportWebVitalsCallback) {
 
   useEffect(() => {
     // Flush calculated metrics
-    const reportMetric = (metric: NextWebVitalsMetric) => callback(metric)
+    const reportMetric = (metric: NextWebVitalsMetric) => {
+      callback(metric)
+      metricIndexRef.current = metrics.length
+    }
     for (let i = metricIndexRef.current; i < metrics.length; i++) {
       reportMetric(metrics[i])
     }
-    metricIndexRef.current = metrics.length
 
     webVitalsCallbacks.add(reportMetric)
     return () => {