feat(jest-config): add support for preset written in ESM (#11200)

CHANGELOG.md

@@ -8,6 +8,7 @@
 - `[jest-circus, jest-jasmine2]` [**BREAKING**] Fail the test instead of just warning when describe returns a value ([#10947](https://github.com/facebook/jest/pull/10947))
 - `[jest-config]` [**BREAKING**] Default to Node testing environment instead of browser (JSDOM) ([#9874](https://github.com/facebook/jest/pull/9874))
 - `[jest-config]` [**BREAKING**] Use `jest-circus` as default test runner ([#10686](https://github.com/facebook/jest/pull/10686))
+- `[jest-config]` Add support for `preset` written in ESM ([#11200](https://github.com/facebook/jest/pull/11200))
 - `[jest-config, jest-runtime]` Support ESM for files other than `.js` and `.mjs` ([#10823](https://github.com/facebook/jest/pull/10823))
 - `[jest-config, jest-runtime]` [**BREAKING**] Use "modern" implementation as default for fake timers ([#10874](https://github.com/facebook/jest/pull/10874) & [#11197](https://github.com/facebook/jest/pull/11197))
 - `[jest-core]` make `TestWatcher` extend `emittery` ([#10324](https://github.com/facebook/jest/pull/10324))

docs/Configuration.md

@@ -616,7 +616,7 @@ Specifies notification mode. Requires `notify: true`.
 
 Default: `undefined`
 
-A preset that is used as a base for Jest's configuration. A preset should point to an npm module that has a `jest-preset.json` or `jest-preset.js` file at the root.
+A preset that is used as a base for Jest's configuration. A preset should point to an npm module that has a `jest-preset.json`, `jest-preset.js`, `jest-preset.cjs` or `jest-preset.mjs` file at the root.
 
 For example, this preset `foo-bar/jest-preset.js` will be configured as follows:
 

e2e/__tests__/presets.test.ts

@@ -5,14 +5,24 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import {onNodeVersions} from '@jest/test-utils';
 import runJest from '../runJest';
 
 test('supports json preset', () => {
   const result = runJest('presets/json');
   expect(result.exitCode).toBe(0);
 });
 
-test('supports js preset', () => {
-  const result = runJest('presets/js');
+test.each(['js', 'cjs'])('supports %s preset', presetDir => {
+  const result = runJest(`presets/${presetDir}`);
+
   expect(result.exitCode).toBe(0);
 });
+
+onNodeVersions('^12.17.0 || >=13.2.0', () => {
+  test.each(['mjs', 'js-type-module'])('supports %s preset', presetDir => {
+    const result = runJest(`presets/${presetDir}`);
+
+    expect(result.exitCode).toBe(0);
+  });
+});

e2e/presets/cjs/__tests__/index.js

@@ -0,0 +1,11 @@
+/**
+ * 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.
+ */
+'use strict';
+
+test('load file mapped by cjs preset', () => {
+  expect(require('./test.foo')).toEqual(42);
+});

e2e/presets/cjs/package.json

@@ -0,0 +1,5 @@
+{
+  "jest": {
+    "preset": "jest-preset-cjs"
+  }
+}

e2e/presets/js-type-module/__tests__/index.js

@@ -0,0 +1,11 @@
+/**
+ * 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.
+ */
+'use strict';
+
+test('load file mapped by js preset', () => {
+  expect(require('./test.foo')).toEqual(42);
+});

e2e/presets/js-type-module/package.json

@@ -0,0 +1,5 @@
+{
+  "jest": {
+    "preset": "jest-preset-js-type-module"
+  }
+}

e2e/presets/mjs/__tests__/index.js

@@ -0,0 +1,11 @@
+/**
+ * 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.
+ */
+'use strict';
+
+test('load file mapped by mjs preset', () => {
+  expect(require('./test.foo')).toEqual(42);
+});

e2e/presets/mjs/package.json

@@ -0,0 +1,5 @@
+{
+  "jest": {
+    "preset": "jest-preset-mjs"
+  }
+}