From e07c7a7cfc4482f7f76ce30443359305116c8417 Mon Sep 17 00:00:00 2001
From: Barry Pollard <barrypollard@google.com>
Date: Wed, 27 Dec 2023 18:41:27 +0000
Subject: [PATCH] Add exra guard for PerformanceEventTiming not existing (#403)

---
 src/onINP.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/onINP.ts b/src/onINP.ts
index cf857de5..ac23c2fe 100644
--- a/src/onINP.ts
+++ b/src/onINP.ts
@@ -220,7 +220,10 @@ export const onINP = (onReport: INPReportCallback, opts?: ReportOpts) => {
       // If browser supports interactionId (and so supports INP), also
       // observe entries of type `first-input`. This is useful in cases
       // where the first interaction is less than the `durationThreshold`.
-      if ('interactionId' in PerformanceEventTiming.prototype) {
+      if (
+        'PerformanceEventTiming' in window &&
+        'interactionId' in PerformanceEventTiming.prototype
+      ) {
         po.observe({type: 'first-input', buffered: true});
       }