globalSetup and globalTeardown use default export with es modules

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Features
 
 - `[jest-resolve]`: Pass default resolver into custom resolvers ([#7714](https://github.com/facebook/jest/pull/7714))
+- `[jest-cli]`: `global{Setup,Teardown}` use default export with es modules ([#7750](https://github.com/facebook/jest/pull/7750))
 
 ### Fixes
 

e2e/__tests__/globalSetup.test.js

@@ -122,3 +122,36 @@ test('should not call any globalSetup if there are no tests to run', () => {
   expect(fs.existsSync(project1DIR)).toBe(false);
   expect(fs.existsSync(project2DIR)).toBe(false);
 });
+
+test('globalSetup works with default export', () => {
+  const setupPath = path.resolve(
+    __dirname,
+    '../global-setup/setupWithDefaultExport.js',
+  );
+
+  const testPathPattern = 'pass';
+
+  const result = runJest('global-setup', [
+    `--globalSetup=${setupPath}`,
+    `--testPathPattern=${testPathPattern}`,
+  ]);
+
+  expect(result.stdout).toBe(testPathPattern);
+});
+
+test('globalSetup throws with named export', () => {
+  const setupPath = path.resolve(
+    __dirname,
+    '../global-setup/invalidSetupWithNamedExport.js',
+  );
+
+  const {status, stderr} = runJest('global-setup', [
+    `--globalSetup=${setupPath}`,
+    `--testPathPattern=__tests__`,
+  ]);
+
+  expect(status).toBe(1);
+  expect(stderr).toMatch(
+    `TypeError: globalSetup file must export a function at ${setupPath}`,
+  );
+});

e2e/__tests__/globalTeardown.test.js

@@ -111,3 +111,36 @@ test('should not call a globalTeardown of a project if there are no tests to run
   expect(fs.existsSync(project1DIR)).toBe(true);
   expect(fs.existsSync(project2DIR)).toBe(false);
 });
+
+test('globalTeardown works with default export', () => {
+  const teardownPath = path.resolve(
+    __dirname,
+    '../global-teardown/teardownWithDefaultExport.js',
+  );
+
+  const testPathPattern = 'pass';
+
+  const result = runJest('global-teardown', [
+    `--globalTeardown=${teardownPath}`,
+    `--testPathPattern=${testPathPattern}`,
+  ]);
+
+  expect(result.stdout).toBe(testPathPattern);
+});
+
+test('globalTeardown throws with named export', () => {
+  const teardownPath = path.resolve(
+    __dirname,
+    '../global-teardown/invalidTeardownWithNamedExport.js',
+  );
+
+  const {status, stderr} = runJest('global-teardown', [
+    `--globalTeardown=${teardownPath}`,
+    `--testPathPattern=__tests__`,
+  ]);
+
+  expect(status).toBe(1);
+  expect(stderr).toMatch(
+    `TypeError: globalTeardown file must use a default export with ES Modules at ${teardownPath}`,
+  );
+});

e2e/global-setup/babel.config.js

@@ -1,5 +1,5 @@
 // Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 
 module.exports = {
-  presets: ['@babel/preset-flow'],
+  presets: ['@babel/preset-env', '@babel/preset-flow'],
 };

e2e/global-setup/invalidSetupWithNamedExport.js

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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.
+ */
+
+function invalidSetupWithNamedExport(jestConfig): void {
+  console.log(jestConfig.testPathPattern);
+}
+
+export {invalidSetupWithNamedExport};

e2e/global-setup/setupWithDefaultExport.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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.
+ */
+
+export default function(jestConfig): void {
+  console.log(jestConfig.testPathPattern);
+}

e2e/global-teardown/babel.config.js

@@ -0,0 +1,5 @@
+// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+
+module.exports = {
+  presets: ['@babel/preset-env', '@babel/preset-flow'],
+};

e2e/global-teardown/invalidTeardownWithNamedExport.js

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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.
+ */
+
+function invalidTeardownWithNamedExport(jestConfig): void {
+  console.log(jestConfig.testPathPattern);
+}
+
+export {invalidTeardownWithNamedExport};

e2e/global-teardown/teardownWithDefaultExport.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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.
+ */
+
+export default function(jestConfig): void {
+  console.log(jestConfig.testPathPattern);
+}

packages/jest-cli/src/runGlobalHook.js

@@ -15,6 +15,11 @@ import pEachSeries from 'p-each-series';
 import {addHook} from 'pirates';
 import Runtime from 'jest-runtime';
 
+// copied from https://github.com/babel/babel/blob/56044c7851d583d498f919e9546caddf8f80a72f/packages/babel-helpers/src/helpers.js#L558-L562
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}
+
 export default ({
   allTests,
   globalConfig,
@@ -59,7 +64,7 @@ export default ({
       );
 
       // $FlowFixMe
-      const globalModule = require(modulePath);
+      const globalModule = _interopRequireDefault(require(modulePath)).default;
 
       if (typeof globalModule !== 'function') {
         throw new TypeError(