From 1c99b18193d9a70403b07d8e343d41757fea7b4f Mon Sep 17 00:00:00 2001
From: bheemreddy-samsara <bheem.reddy@samsara.com>
Date: Thu, 8 Jan 2026 21:21:10 -0600
Subject: [PATCH 1/2] fix(runtime): add Object.hasOwn polyfill for JSC
 compatibility

JSC (JavaScriptCore) doesn't support Object.hasOwn (ES2022). This causes
runtime errors when @vitest/expect v4.x initializes.

The polyfill is loaded before any other runtime code to ensure
Object.hasOwn is available when @vitest/expect initializes.
---
 packages/runtime/src/index.ts     |  1 +
 packages/runtime/src/polyfills.ts | 14 ++++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 packages/runtime/src/polyfills.ts

diff --git a/packages/runtime/src/index.ts b/packages/runtime/src/index.ts
index dc03137..1dc1c6e 100644
--- a/packages/runtime/src/index.ts
+++ b/packages/runtime/src/index.ts
@@ -1,3 +1,4 @@
+import './polyfills.js';
 import './globals.d.ts';
 
 export { UI as ReactNativeHarness } from './ui/index.js';
diff --git a/packages/runtime/src/polyfills.ts b/packages/runtime/src/polyfills.ts
new file mode 100644
index 0000000..df8ed18
--- /dev/null
+++ b/packages/runtime/src/polyfills.ts
@@ -0,0 +1,14 @@
+/**
+ * Polyfills for ES2022+ features not supported by JSC (JavaScriptCore).
+ *
+ * JSC, used in React Native when Hermes is disabled, doesn't support
+ * Object.hasOwn (ES2022). This causes runtime errors when @vitest/expect
+ * v4.x initializes.
+ *
+ * This polyfill must be loaded before any code that uses Object.hasOwn.
+ */
+
+if (typeof Object.hasOwn !== 'function') {
+  Object.hasOwn = (obj: object, prop: PropertyKey): boolean =>
+    Object.prototype.hasOwnProperty.call(obj, prop);
+}

From 85c5d3ebf3af467c7620169c4abd02cdda5e680a Mon Sep 17 00:00:00 2001
From: Szymon Chmal <szymon@chmal.it>
Date: Mon, 12 Jan 2026 13:22:34 +0100
Subject: [PATCH 2/2] chore: add version plan

---
 .nx/version-plans/version-plan-1768220533507.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .nx/version-plans/version-plan-1768220533507.md

diff --git a/.nx/version-plans/version-plan-1768220533507.md b/.nx/version-plans/version-plan-1768220533507.md
new file mode 100644
index 0000000..4462d45
--- /dev/null
+++ b/.nx/version-plans/version-plan-1768220533507.md
@@ -0,0 +1,5 @@
+---
+__default__: prerelease
+---
+
+Adds Object.hasOwn polyfill to the runtime package for JSC (JavaScriptCore) compatibility.