From b4d1dc08132651a98afef7e1321a82537f9a7391 Mon Sep 17 00:00:00 2001
From: Oskar Eichler <oskar@songstats.com>
Date: Sun, 30 Aug 2026 11:36:25 +0200
Subject: [PATCH] Preserve null NodeList forEach context

---
 .../webapis/dom/oldstylecollections/NodeList.js      |  2 +-
 .../oldstylecollections/__tests__/NodeList-itest.js  | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/packages/react-native/src/private/webapis/dom/oldstylecollections/NodeList.js b/packages/react-native/src/private/webapis/dom/oldstylecollections/NodeList.js
index dc9cc466453..31eee8b52ad 100644
--- a/packages/react-native/src/private/webapis/dom/oldstylecollections/NodeList.js
+++ b/packages/react-native/src/private/webapis/dom/oldstylecollections/NodeList.js
@@ -75,7 +75,7 @@ export default class NodeList<T> implements Iterable<T>, ArrayLike<T> {
     const arrayLike: ArrayLike<T> = this;
 
     for (let index = 0; index < this._length; index++) {
-      if (thisArg == null) {
+      if (thisArg === undefined) {
         callbackFn(arrayLike[index], index, this);
       } else {
         callbackFn.call(thisArg, arrayLike[index], index, this);
diff --git a/packages/react-native/src/private/webapis/dom/oldstylecollections/__tests__/NodeList-itest.js b/packages/react-native/src/private/webapis/dom/oldstylecollections/__tests__/NodeList-itest.js
index fc7710f028a..466600d4a76 100644
--- a/packages/react-native/src/private/webapis/dom/oldstylecollections/__tests__/NodeList-itest.js
+++ b/packages/react-native/src/private/webapis/dom/oldstylecollections/__tests__/NodeList-itest.js
@@ -166,6 +166,18 @@ describe('NodeList', () => {
         i++;
       }, explicitThis);
     });
+
+    it('preserves an explicit null `this` argument', () => {
+      const collection = createNodeList(['a']);
+      let that;
+
+      collection.forEach(function (this: unknown) {
+        'use strict';
+        that = this;
+      }, null);
+
+      expect(that).toBe(null);
+    });
   });
 
   describe('global constructor', () => {