From 37bcdcde044131d49f11b2f62873a200a94ec756 Mon Sep 17 00:00:00 2001
From: Ruslan Lesiutin <28902667+hoxyq@users.noreply.github.com>
Date: Thu, 11 Dec 2025 12:15:00 +0000
Subject: [PATCH] fix[devtools]: feature-check document with typeof instead of
 direct reference (#35343)

Follow-up to https://github.com/facebook/react/pull/35296.

We can get `ReferenceError` if this is unavailable. Using `typeof` check
instead for safety.
---
 .../src/backend/views/Highlighter/index.js                 | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/react-devtools-shared/src/backend/views/Highlighter/index.js b/packages/react-devtools-shared/src/backend/views/Highlighter/index.js
index f1711e02c3..03397012b5 100644
--- a/packages/react-devtools-shared/src/backend/views/Highlighter/index.js
+++ b/packages/react-devtools-shared/src/backend/views/Highlighter/index.js
@@ -96,8 +96,11 @@ export default function setupHighlighter(
     applyingScroll = false;
   }
 
-  // $FlowFixMe[method-unbinding]
-  if (document && typeof document.addEventListener === 'function') {
+  if (
+    typeof document === 'object' &&
+    // $FlowFixMe[method-unbinding]
+    typeof document.addEventListener === 'function'
+  ) {
     document.addEventListener('scroll', () => {
       if (!scrollTimer) {
         // Periodically synchronize the scroll while scrolling.