From c32593ed4ffd037b29562eb6bd105d60d65da9db Mon Sep 17 00:00:00 2001
From: Oskar Eichler <oskar@songstats.com>
Date: Mon, 31 Aug 2026 02:45:13 +0300
Subject: [PATCH] Invalidate preset cache on dependency updates

---
 .../src/__tests__/cache-key-test.js           | 29 +++++++++++++++++++
 .../react-native-babel-preset/src/index.js    |  1 +
 2 files changed, 30 insertions(+)
 create mode 100644 packages/react-native-babel-preset/src/__tests__/cache-key-test.js

diff --git a/packages/react-native-babel-preset/src/__tests__/cache-key-test.js b/packages/react-native-babel-preset/src/__tests__/cache-key-test.js
new file mode 100644
index 00000000000..a14ad66633c
--- /dev/null
+++ b/packages/react-native-babel-preset/src/__tests__/cache-key-test.js
@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @noflow
+ */
+
+'use strict';
+
+function getCacheKey(packageContents) {
+  jest.resetModules();
+  jest.doMock('node:fs', () => ({
+    readFileSync: filename =>
+      filename.endsWith('package.json')
+        ? Buffer.from(packageContents)
+        : Buffer.from(filename),
+  }));
+
+  return require('../index').getCacheKey();
+}
+
+test('cache key includes package metadata for main builds', () => {
+  expect(getCacheKey('{"dependency":"1.0.0"}')).not.toBe(
+    getCacheKey('{"dependency":"2.0.0"}'),
+  );
+});
diff --git a/packages/react-native-babel-preset/src/index.js b/packages/react-native-babel-preset/src/index.js
index 27e558a1f7e..54131c6d50f 100644
--- a/packages/react-native-babel-preset/src/index.js
+++ b/packages/react-native-babel-preset/src/index.js
@@ -35,6 +35,7 @@ module.exports.getCacheKey = () => {
   const {readFileSync} = require('node:fs');
   const key = createHash('md5');
   [
+    readFileSync(require.resolve('../package.json')),
     readFileSync(__filename),
     readFileSync(require.resolve('./configs/main.js')),
     readFileSync(require.resolve('./configs/hmr.js')),