From c60a607613865c15aae686ba181a9fe1a8055fbc Mon Sep 17 00:00:00 2001
From: rory <rory@expensify.com>
Date: Fri, 21 Aug 2026 23:09:18 -0700
Subject: [PATCH] test: lock NullishDeep for interface-shaped values

Regression for partial nested null updates on interface types
so Record-constraint regressions fail typecheck.
---
 tests/types/nullishDeep.ts | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 tests/types/nullishDeep.ts

diff --git a/tests/types/nullishDeep.ts b/tests/types/nullishDeep.ts
new file mode 100644
index 000000000..4c0972457
--- /dev/null
+++ b/tests/types/nullishDeep.ts
@@ -0,0 +1,19 @@
+import type {NullishDeep} from '../../dist/types';
+
+interface TextEditor {
+    fontSize: number;
+    fontColor: string;
+    fontWeight: number;
+}
+
+interface Settings {
+    textEditor: TextEditor;
+    autosave: boolean;
+}
+
+// Interface-based Onyx value types must support partial nested null updates via NullishDeep
+const partialSettingsUpdate: NullishDeep<Settings> = {
+    textEditor: {fontWeight: 500, fontColor: null},
+};
+
+export default partialSettingsUpdate;