From 27c381e8124e2f8ad8308be529623a7ec275d56f Mon Sep 17 00:00:00 2001
From: Brad Frost <bfrost@squarespace.com>
Date: Fri, 4 Dec 2020 13:52:06 -0500
Subject: [PATCH] fix(xhr): check for resource timing support

---
 .../src/xhr.ts                                              | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/opentelemetry-instrumentation-xml-http-request/src/xhr.ts b/packages/opentelemetry-instrumentation-xml-http-request/src/xhr.ts
index 70fa9cf5d8..2ee1d0afe8 100644
--- a/packages/opentelemetry-instrumentation-xml-http-request/src/xhr.ts
+++ b/packages/opentelemetry-instrumentation-xml-http-request/src/xhr.ts
@@ -168,7 +168,11 @@ export class XMLHttpRequestInstrumentation extends InstrumentationBase<XMLHttpRe
    */
   private _addResourceObserver(xhr: XMLHttpRequest, spanUrl: string) {
     const xhrMem = this._xhrMem.get(xhr);
-    if (!xhrMem || typeof window.PerformanceObserver === 'undefined') {
+    if (
+      !xhrMem ||
+      typeof window.PerformanceObserver === 'undefined' ||
+      typeof window.PerformanceResourceTiming === 'undefined'
+    ) {
       return;
     }
     xhrMem.createdResources = {