From 42f589f58d62aaf8c3de3f1a9dc4bf8429b83cc4 Mon Sep 17 00:00:00 2001
From: Bastien Caudan <bastien.caudan@gmail.com>
Date: Tue, 24 Nov 2020 12:09:02 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20[RUMF-791]=20prevent=20IE11=20pe?=
 =?UTF-8?q?rformance=20entry=20error=20(#633)?=
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* 🐛 [RUMF-791] prevent IE11 performance entry error

toJSON is not available in IE11, prevent execution error

* :ok_hand: different form

Co-authored-by: Benoît Zugmeyer <benoit.zugmeyer@datadoghq.com>

Co-authored-by: Benoît Zugmeyer <benoit.zugmeyer@datadoghq.com>
---
 .../rumEventsCollection/resource/matchRequestTiming.ts   | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/packages/rum/src/domain/rumEventsCollection/resource/matchRequestTiming.ts b/packages/rum/src/domain/rumEventsCollection/resource/matchRequestTiming.ts
index 2c7add5d78..783ab7f927 100644
--- a/packages/rum/src/domain/rumEventsCollection/resource/matchRequestTiming.ts
+++ b/packages/rum/src/domain/rumEventsCollection/resource/matchRequestTiming.ts
@@ -24,8 +24,13 @@ export function matchRequestTiming(request: RequestCompleteEvent) {
   if (!performance || !('getEntriesByName' in performance)) {
     return
   }
-  const candidates = performance
-    .getEntriesByName(request.url, 'resource')
+  const sameNameEntries = performance.getEntriesByName(request.url, 'resource')
+
+  if (!sameNameEntries.length || !('toJSON' in sameNameEntries[0])) {
+    return
+  }
+
+  const candidates = sameNameEntries
     .map((entry) => entry.toJSON() as RumPerformanceResourceTiming)
     .filter(toValidEntry)
     .filter((entry) => isBetween(entry, request.startTime, endTime(request)))