tests for getGraphId + calcTransformerOptions

packages/metro/src/lib/__tests__/getGraphId-test.js

@@ -215,4 +215,35 @@ describe('getGraphId', () => {
       ),
     );
   });
+
+  it('generates a unique id with unstable_disableModuleWrapping', () => {
+    const transformOptions = {
+      dev: true,
+      hot: true,
+      minify: true,
+      type: 'module',
+      platform: 'web',
+      runtimeBytecodeVersion: null,
+      unstable_transformProfile: 'default',
+    };
+    expect(
+      getGraphId(
+        '/root/waddup',
+        {
+          ...transformOptions,
+          unstable_disableModuleWrapping: false,
+        },
+        {shallow: false, experimentalImportBundleSupport: false},
+      ),
+    ).not.toBe(
+      getGraphId(
+        '/root/waddup',
+        {
+          ...transformOptions,
+          unstable_disableModuleWrapping: true,
+        },
+        {shallow: false, experimentalImportBundleSupport: false},
+      ),
+    );
+  });
 });

packages/metro/src/lib/__tests__/transformHelpers-test.js

@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @emails oncall+metro_bundler
+ * @format
+ */
+
+'use strict';
+
+const {calcTransformerOptions} = require('../transformHelpers');
+
+describe('calcTransformerOptions', () => {
+  const entryFiles = [];
+  const bundler = {};
+  const deltaBundler = {};
+  const options = {};
+
+  it('returns `unstable_disableModuleWrapping: false` by default', async () => {
+    const transformOptions = await calcTransformerOptions(
+      entryFiles,
+      bundler,
+      deltaBundler,
+      {
+        transformer: {
+          getTransformOptions: async () => ({
+            transform: {},
+          }),
+        },
+      },
+      options,
+    );
+    expect(transformOptions.unstable_disableModuleWrapping).toBe(false);
+  });
+
+  it('returns `unstable_disableModuleWrapping`', async () => {
+    const transformOptions = await calcTransformerOptions(
+      entryFiles,
+      bundler,
+      deltaBundler,
+      {
+        transformer: {
+          getTransformOptions: async () => ({
+            transform: {
+              unstable_disableModuleWrapping: true,
+            },
+          }),
+        },
+      },
+      options,
+    );
+    expect(transformOptions.unstable_disableModuleWrapping).toBe(true);
+  });
+});

packages/metro/src/lib/transformHelpers.js

@@ -167,6 +167,7 @@ async function getResolveDependencyFn(
 }
 
 module.exports = {
+  calcTransformerOptions,
   getTransformFn,
   getResolveDependencyFn,
 };