moduleFileExtensions extensions is now passed to babel-jest

integration_tests/__tests__/transform.test.js

@@ -120,3 +120,25 @@ describe('multiple-transformers', () => {
     expect(json.numPassedTests).toBe(1);
   });
 });
+
+describe('ecmascript-modules-support', () => {
+  skipOnWindows.suite();
+  const dir = path.resolve(
+    __dirname,
+    '..',
+    'transform/ecmascript-modules-support',
+  );
+
+  beforeEach(() => {
+    if (process.platform !== 'win32') {
+      run('yarn', dir);
+    }
+  });
+
+  it('runs transpiled code', () => {
+    // --no-cache because babel can cache stuff and result in false green
+    const {json} = runJest.json(dir, ['--no-cache']);
+    expect(json.success).toBe(true);
+    expect(json.numTotalTests).toBeGreaterThanOrEqual(1);
+  });
+});

integration_tests/transform/ecmascript-modules-support/.babelrc

@@ -0,0 +1,10 @@
+{
+  "presets": [
+    ["env", {
+      "targets": {
+        "node": "current"
+      },
+      "modules": "commonjs"
+    }]
+  ]
+}

integration_tests/transform/ecmascript-modules-support/__tests__/ecmascript-modules-support.mjs

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+import {foo} from '../src/module';
+
+it('can be used with mjs files using babel-jest', () => {
+  expect(foo()).toBe('a');
+});

integration_tests/transform/ecmascript-modules-support/package.json

@@ -0,0 +1,14 @@
+{
+  "dependencies": {
+    "babel-preset-env": "^1.6.1"
+  },
+
+  "jest": {
+    "testEnvironment": "node",
+    "moduleFileExtensions": ["js", "json", "jsx", "node", "mjs"],
+    "testMatch": [ "**/__tests__/**/*.mjs"],
+    "transform": {
+      "^.+\\.mjs?$": "../../../packages/babel-jest"
+    }
+  }
+}

integration_tests/transform/ecmascript-modules-support/src/index.mjs

@@ -0,0 +1,3 @@
+import {foo} from './module';
+
+foo();

integration_tests/transform/ecmascript-modules-support/src/module.mjs

@@ -0,0 +1 @@
+export const foo = () => 'a';