From dcc71bb06a1018829a3512cefd101eb77bcd3f68 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Tue, 29 Sep 2020 20:29:20 +0200
Subject: [PATCH 01/38] feat: Add support for the `jest.config.ts`
 configuration file

---
 docs/Configuration.md                         | 19 ++++-
 .../__snapshots__/jest.config.ts.test.ts.snap | 36 ++++++++++
 e2e/__tests__/jest.config.ts.test.ts          | 71 +++++++++++++++++++
 .../jest-cli/src/__tests__/cli/args.test.ts   |  4 +-
 packages/jest-config/package.json             |  3 +-
 .../src/__tests__/resolveConfigPath.test.ts   |  2 +-
 packages/jest-config/src/constants.ts         |  2 +
 packages/jest-config/src/index.ts             |  2 +-
 .../src/readConfigFileAndSetRootDir.ts        | 29 ++++++--
 .../version-26.4/Configuration.md             | 19 ++++-
 10 files changed, 176 insertions(+), 11 deletions(-)
 create mode 100644 e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
 create mode 100644 e2e/__tests__/jest.config.ts.test.ts

diff --git a/docs/Configuration.md b/docs/Configuration.md
index c1fbe728e023..828aac9f39fd 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -3,7 +3,7 @@ id: configuration
 title: Configuring Jest
 ---
 
-Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` file or through the `--config <path/to/file.js|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
+Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
 
 ```json
 {
@@ -31,6 +31,23 @@ module.exports = async () => {
 };
 ```
 
+Or through TypeScript:
+
+```ts
+// jest.config.ts
+//Sync object
+export = {
+  verbose: true,
+};
+
+//Or async function
+export default async (): Promise<Config.InitialOptions> => {
+  return {
+    verbose: true,
+  };
+};
+```
+
 Please keep in mind that the resulting configuration must be JSON-serializable.
 
 When using the `--config` option, the JSON file must not contain a "jest" key:
diff --git a/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap b/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
new file mode 100644
index 000000000000..231d926a36de
--- /dev/null
+++ b/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
@@ -0,0 +1,36 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`traverses directory tree up until it finds jest.config 1`] = `
+  console.log
+<<REPLACED>>/jest.config.ts/some/nested/directory
+
+      at Object.log (__tests__/a-giraffe.js:3:27)
+
+`;
+
+exports[`traverses directory tree up until it finds jest.config 2`] = `
+PASS ../../../__tests__/a-giraffe.js
+  ✓ giraffe
+  ✓ abc
+`;
+
+exports[`traverses directory tree up until it finds jest.config 3`] = `
+Test Suites: 1 passed, 1 total
+Tests:       2 passed, 2 total
+Snapshots:   0 total
+Time:        <<REPLACED>>
+Ran all test suites.
+`;
+
+exports[`works with jest.config.ts 1`] = `
+PASS __tests__/a-giraffe.js
+  ✓ giraffe
+`;
+
+exports[`works with jest.config.ts 2`] = `
+Test Suites: 1 passed, 1 total
+Tests:       1 passed, 1 total
+Snapshots:   0 total
+Time:        <<REPLACED>>
+Ran all test suites.
+`;
diff --git a/e2e/__tests__/jest.config.ts.test.ts b/e2e/__tests__/jest.config.ts.test.ts
new file mode 100644
index 000000000000..ff71917137a5
--- /dev/null
+++ b/e2e/__tests__/jest.config.ts.test.ts
@@ -0,0 +1,71 @@
+/**
+ * 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.
+ */
+
+import * as path from 'path';
+import {wrap} from 'jest-snapshot-serializer-raw';
+import runJest from '../runJest';
+import {cleanup, extractSummary, writeFiles} from '../Utils';
+
+const DIR = path.resolve(__dirname, '../jest.config.ts');
+
+beforeEach(() => cleanup(DIR));
+afterAll(() => cleanup(DIR));
+
+test('works with jest.config.ts', () => {
+  writeFiles(DIR, {
+    '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
+    'jest.config.ts': `module.exports = {testRegex: '.*-giraffe.js'};`,
+    'package.json': '{}',
+  });
+
+  const {stderr, exitCode} = runJest(DIR, ['-w=1', '--ci=false']);
+  const {rest, summary} = extractSummary(stderr);
+  expect(exitCode).toBe(0);
+  expect(wrap(rest)).toMatchSnapshot();
+  expect(wrap(summary)).toMatchSnapshot();
+});
+
+test('traverses directory tree up until it finds jest.config', () => {
+  writeFiles(DIR, {
+    '__tests__/a-giraffe.js': `
+    const slash = require('slash');
+    test('giraffe', () => expect(1).toBe(1));
+    test('abc', () => console.log(slash(process.cwd())));
+    `,
+    'jest.config.ts': `module.exports = {testRegex: '.*-giraffe.js'};`,
+    'package.json': '{}',
+    'some/nested/directory/file.js': '// nothing special',
+  });
+
+  const {stderr, exitCode, stdout} = runJest(
+    path.join(DIR, 'some', 'nested', 'directory'),
+    ['-w=1', '--ci=false'],
+    {skipPkgJsonCheck: true},
+  );
+
+  // Snapshot the console.loged `process.cwd()` and make sure it stays the same
+  expect(
+    wrap(stdout.replace(/^\W+(.*)e2e/gm, '<<REPLACED>>')),
+  ).toMatchSnapshot();
+
+  const {rest, summary} = extractSummary(stderr);
+  expect(exitCode).toBe(0);
+  expect(wrap(rest)).toMatchSnapshot();
+  expect(wrap(summary)).toMatchSnapshot();
+});
+
+test('invalid JS in jest.config.ts', () => {
+  writeFiles(DIR, {
+    '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
+    'jest.config.ts': `module.exports = i'll break this file yo`,
+    'package.json': '{}',
+  });
+
+  const {stderr, exitCode} = runJest(DIR, ['-w=1', '--ci=false']);
+  expect(stderr).toMatch('Error: Jest: Failed to parse config file ');
+  expect(exitCode).toBe(1);
+});
diff --git a/packages/jest-cli/src/__tests__/cli/args.test.ts b/packages/jest-cli/src/__tests__/cli/args.test.ts
index 55fe1255671d..333b395f7880 100644
--- a/packages/jest-cli/src/__tests__/cli/args.test.ts
+++ b/packages/jest-cli/src/__tests__/cli/args.test.ts
@@ -82,13 +82,13 @@ describe('check', () => {
   it('raises an exception if config is not a valid JSON string', () => {
     const argv = {config: 'x:1'} as Config.Argv;
     expect(() => check(argv)).toThrow(
-      'The --config option requires a JSON string literal, or a file path with one of these extensions: .js, .mjs, .cjs, .json',
+      'The --config option requires a JSON string literal, or a file path with one of these extensions: .ts, .js, .mjs, .cjs, .json',
     );
   });
 
   it('raises an exception if config is not a supported file type', () => {
     const message =
-      'The --config option requires a JSON string literal, or a file path with one of these extensions: .js, .mjs, .cjs, .json';
+      'The --config option requires a JSON string literal, or a file path with one of these extensions: .ts, .js, .mjs, .cjs, .json';
 
     expect(() => check({config: 'jest.configjs'} as Config.Argv)).toThrow(
       message,
diff --git a/packages/jest-config/package.json b/packages/jest-config/package.json
index 0428d3611073..ed3aa8a6a4af 100644
--- a/packages/jest-config/package.json
+++ b/packages/jest-config/package.json
@@ -27,7 +27,8 @@
     "jest-util": "^26.3.0",
     "jest-validate": "^26.4.2",
     "micromatch": "^4.0.2",
-    "pretty-format": "^26.4.2"
+    "pretty-format": "^26.4.2",
+    "typescript": "^4.0.3"
   },
   "devDependencies": {
     "@types/babel__core": "^7.0.4",
diff --git a/packages/jest-config/src/__tests__/resolveConfigPath.test.ts b/packages/jest-config/src/__tests__/resolveConfigPath.test.ts
index 0fba06b58295..b90166c73877 100644
--- a/packages/jest-config/src/__tests__/resolveConfigPath.test.ts
+++ b/packages/jest-config/src/__tests__/resolveConfigPath.test.ts
@@ -81,7 +81,7 @@ describe.each(JEST_CONFIG_EXT_ORDER.slice(0))(
 
       writeFiles(DIR, {[relativeJestConfigPath]: ''});
 
-      // jest.config.js takes presedence
+      // jest.config.js takes precedence
 
       // absolute
       expect(
diff --git a/packages/jest-config/src/constants.ts b/packages/jest-config/src/constants.ts
index 3ae6c9701ece..9873b4b344c1 100644
--- a/packages/jest-config/src/constants.ts
+++ b/packages/jest-config/src/constants.ts
@@ -15,9 +15,11 @@ export const JEST_CONFIG_BASE_NAME = 'jest.config';
 export const JEST_CONFIG_EXT_CJS = '.cjs';
 export const JEST_CONFIG_EXT_MJS = '.mjs';
 export const JEST_CONFIG_EXT_JS = '.js';
+export const JEST_CONFIG_EXT_TS = '.ts';
 export const JEST_CONFIG_EXT_JSON = '.json';
 export const JEST_CONFIG_EXT_ORDER = Object.freeze([
   JEST_CONFIG_EXT_JS,
+  JEST_CONFIG_EXT_TS,
   JEST_CONFIG_EXT_MJS,
   JEST_CONFIG_EXT_CJS,
   JEST_CONFIG_EXT_JSON,
diff --git a/packages/jest-config/src/index.ts b/packages/jest-config/src/index.ts
index c0cc2326a7ec..17f930260df2 100644
--- a/packages/jest-config/src/index.ts
+++ b/packages/jest-config/src/index.ts
@@ -74,7 +74,7 @@ export async function readConfig(
     config.rootDir = config.rootDir || packageRootOrConfig;
     rawOptions = config;
     // A string passed to `--config`, which is either a direct path to the config
-    // or a path to directory containing `package.json` or `jest.config.js`
+    // or a path to directory containing `package.json`, `jest.config.js` or `jest.config.ts`
   } else if (!skipArgvConfigOption && typeof argv.config == 'string') {
     configPath = resolveConfigPath(argv.config, process.cwd());
     rawOptions = await readConfigFileAndSetRootDir(configPath);
diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 06cbaecc10d6..1354f6e9c6cf 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -9,22 +9,43 @@ import * as path from 'path';
 import {pathToFileURL} from 'url';
 import * as fs from 'graceful-fs';
 import type {Config} from '@jest/types';
+import {transpileModule} from 'typescript';
 // @ts-expect-error: vendored
 import jsonlint from './vendor/jsonlint';
-import {JEST_CONFIG_EXT_JSON, PACKAGE_JSON} from './constants';
+import {
+  JEST_CONFIG_EXT_JSON,
+  JEST_CONFIG_EXT_TS,
+  PACKAGE_JSON,
+} from './constants';
 
 // Read the configuration and set its `rootDir`
 // 1. If it's a `package.json` file, we look into its "jest" property
-// 2. For any other file, we just require it. If we receive an 'ERR_REQUIRE_ESM'
+// 2. If it's a `jest.config.ts` file, we convert it in JS and we parse it
+// 3. For any other file, we just require it. If we receive an 'ERR_REQUIRE_ESM'
 //    from node, perform a dynamic import instead.
 export default async function readConfigFileAndSetRootDir(
   configPath: Config.Path,
 ): Promise<Config.InitialOptions> {
+  const isTS = configPath.endsWith(JEST_CONFIG_EXT_TS);
   const isJSON = configPath.endsWith(JEST_CONFIG_EXT_JSON);
   let configObject;
 
   try {
-    configObject = require(configPath);
+    if (isTS) {
+      // Get the content of the TS config file
+      const tsConfigFileContent = fs.readFileSync(configPath, {
+        encoding: 'utf8',
+      });
+
+      // Convert the TS content to JS
+      const jsConfigFileContent = transpileModule(tsConfigFileContent, {}).outputText;
+
+      // Execute the JS code to obtain the config
+      // eslint-disable-next-line no-eval
+      configObject = eval(jsConfigFileContent);
+    } else {
+      configObject = require(configPath);
+    }
   } catch (error) {
     if (error.code === 'ERR_REQUIRE_ESM') {
       try {
@@ -49,7 +70,7 @@ export default async function readConfigFileAndSetRootDir(
 
         throw innerError;
       }
-    } else if (isJSON) {
+    } else if (isTS || isJSON) {
       throw new Error(
         `Jest: Failed to parse config file ${configPath}\n` +
           `  ${jsonlint.errors(fs.readFileSync(configPath, 'utf8'))}`,
diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index 0a516470117a..bd63427e0433 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -4,7 +4,7 @@ title: Configuring Jest
 original_id: configuration
 ---
 
-Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` file or through the `--config <path/to/file.js|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
+Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
 
 ```json
 {
@@ -32,6 +32,23 @@ module.exports = async () => {
 };
 ```
 
+Or through TypeScript:
+
+```ts
+// jest.config.ts
+//Sync object
+export = {
+  verbose: true,
+};
+
+//Or async function
+export default async (): Promise<Config.InitialOptions> => {
+  return {
+    verbose: true,
+  };
+};
+```
+
 Please keep in mind that the resulting configuration must be JSON-serializable.
 
 When using the `--config` option, the JSON file must not contain a "jest" key:

From e7b057375a607a2865e1109426fdf680838e00f1 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Tue, 29 Sep 2020 20:46:46 +0200
Subject: [PATCH 02/38] chore: The `jest.config.ts` documentation was updated

---
 docs/Configuration.md                                | 4 +++-
 website/versioned_docs/version-26.4/Configuration.md | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/docs/Configuration.md b/docs/Configuration.md
index 828aac9f39fd..cbf8f81d70af 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -35,10 +35,12 @@ Or through TypeScript:
 
 ```ts
 // jest.config.ts
+import type { Config } from '@jest/types';
+
 //Sync object
 export = {
   verbose: true,
-};
+} as Config.InitialOptions;
 
 //Or async function
 export default async (): Promise<Config.InitialOptions> => {
diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index bd63427e0433..72e37d61eefa 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -36,10 +36,12 @@ Or through TypeScript:
 
 ```ts
 // jest.config.ts
+import type { Config } from '@jest/types';
+
 //Sync object
 export = {
   verbose: true,
-};
+} as Config.InitialOptions;
 
 //Or async function
 export default async (): Promise<Config.InitialOptions> => {

From a2c9fdc003d485898fdd126b6161adc144e75223 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Tue, 29 Sep 2020 20:49:50 +0200
Subject: [PATCH 03/38] chore: The `jest.config.ts` support was specified in
 the CHANGELOG.md

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 99689b1d4169..80b45f5a618d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ### Features
 
+- `[jest-cli, jest-config]` Add support for the `jest.config.ts` configuration file ([#10564](https://github.com/facebook/jest/pull/10564))
 - `[jest-circus, jest-config, jest-runtime]` Add new `injectGlobals` config and CLI option to disable injecting global variables into the runtime ([#10484](https://github.com/facebook/jest/pull/10484))
 - `[jest-each]` Fixes `.each` type to always be callable ([#10447](https://github.com/facebook/jest/pull/10447))
 - `[jest-runner]` Add support for `moduleLoader`s with `default` exports ([#10541](https://github.com/facebook/jest/pull/10541))

From 2b5d97a1ca62fcf743e4ee933ab9ed6edc1299fb Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Tue, 29 Sep 2020 21:30:58 +0200
Subject: [PATCH 04/38] chore: Documentation updated to encourage the usage of
 TS annotations

---
 docs/Configuration.md                                | 7 ++++---
 website/versioned_docs/version-26.4/Configuration.md | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/docs/Configuration.md b/docs/Configuration.md
index cbf8f81d70af..cfdee2d3f768 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -38,9 +38,10 @@ Or through TypeScript:
 import type { Config } from '@jest/types';
 
 //Sync object
-export = {
-  verbose: true,
-} as Config.InitialOptions;
+const config: Config.InitialOptions = {
+  verbose: true
+};
+export = config;
 
 //Or async function
 export default async (): Promise<Config.InitialOptions> => {
diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index 72e37d61eefa..901a5ac8fd67 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -39,9 +39,10 @@ Or through TypeScript:
 import type { Config } from '@jest/types';
 
 //Sync object
-export = {
-  verbose: true,
-} as Config.InitialOptions;
+const config: Config.InitialOptions = {
+  verbose: true
+};
+export = config;
 
 //Or async function
 export default async (): Promise<Config.InitialOptions> => {

From 7f5a39d4425c4e3d2fb55f75f4c5b4e3448d1b52 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Tue, 29 Sep 2020 21:37:35 +0200
Subject: [PATCH 05/38] Errors fixed for tests and prettier

---
 packages/jest-cli/src/__tests__/cli/args.test.ts         | 4 ++--
 .../src/init/__tests__/__snapshots__/init.test.js.snap   | 9 +++++++++
 .../fixtures/has_jest_config_file_ts/jest.config.ts      | 8 ++++++++
 .../fixtures/has_jest_config_file_ts/package.json        | 1 +
 packages/jest-config/src/readConfigFileAndSetRootDir.ts  | 3 ++-
 5 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts
 create mode 100644 packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/package.json

diff --git a/packages/jest-cli/src/__tests__/cli/args.test.ts b/packages/jest-cli/src/__tests__/cli/args.test.ts
index 333b395f7880..5d2e5e5570e4 100644
--- a/packages/jest-cli/src/__tests__/cli/args.test.ts
+++ b/packages/jest-cli/src/__tests__/cli/args.test.ts
@@ -82,13 +82,13 @@ describe('check', () => {
   it('raises an exception if config is not a valid JSON string', () => {
     const argv = {config: 'x:1'} as Config.Argv;
     expect(() => check(argv)).toThrow(
-      'The --config option requires a JSON string literal, or a file path with one of these extensions: .ts, .js, .mjs, .cjs, .json',
+      'The --config option requires a JSON string literal, or a file path with one of these extensions: .js, .ts, .mjs, .cjs, .json',
     );
   });
 
   it('raises an exception if config is not a supported file type', () => {
     const message =
-      'The --config option requires a JSON string literal, or a file path with one of these extensions: .ts, .js, .mjs, .cjs, .json';
+      'The --config option requires a JSON string literal, or a file path with one of these extensions: .js, .ts, .mjs, .cjs, .json';
 
     expect(() => check({config: 'jest.configjs'} as Config.Argv)).toThrow(
       message,
diff --git a/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap b/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap
index 70e36b545cad..0e8040cfade6 100644
--- a/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap
+++ b/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap
@@ -45,6 +45,15 @@ Object {
 }
 `;
 
+exports[`init has-jest-config-file-ts ask the user whether to override config or not user answered with "Yes" 1`] = `
+Object {
+  "initial": true,
+  "message": "It seems that you already have a jest configuration, do you want to override it?",
+  "name": "continue",
+  "type": "confirm",
+}
+`;
+
 exports[`init project with package.json and no jest config all questions answered with answer: "No" should return the default configuration (an empty config) 1`] = `
 "// For a detailed explanation regarding each configuration property, visit:
 // https://jestjs.io/docs/en/configuration.html
diff --git a/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts b/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts
new file mode 100644
index 000000000000..2da8322a7f9b
--- /dev/null
+++ b/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts
@@ -0,0 +1,8 @@
+/**
+ * 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 = {};
diff --git a/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/package.json b/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/package.json
new file mode 100644
index 000000000000..0967ef424bce
--- /dev/null
+++ b/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/package.json
@@ -0,0 +1 @@
+{}
diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 1354f6e9c6cf..f00bd2b40495 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -38,7 +38,8 @@ export default async function readConfigFileAndSetRootDir(
       });
 
       // Convert the TS content to JS
-      const jsConfigFileContent = transpileModule(tsConfigFileContent, {}).outputText;
+      const jsConfigFileContent = transpileModule(tsConfigFileContent, {})
+        .outputText;
 
       // Execute the JS code to obtain the config
       // eslint-disable-next-line no-eval

From 0b680526e964fdc0877296a299ad79ac75698828 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 00:59:00 +0200
Subject: [PATCH 06/38] chore: Use 'ts-node' as peer dependency instead of
 'typescript'

---
 .../__snapshots__/jest.config.ts.test.ts.snap |  2 +
 e2e/__tests__/jest.config.ts.test.ts          | 10 ++--
 package.json                                  |  1 +
 packages/jest-config/package.json             |  6 ++-
 .../src/readConfigFileAndSetRootDir.ts        | 52 ++++++++++++++-----
 packages/jest-config/src/utils.ts             |  4 ++
 yarn.lock                                     | 46 +++++++++++++++-
 7 files changed, 100 insertions(+), 21 deletions(-)

diff --git a/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap b/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
index 231d926a36de..759244e10052 100644
--- a/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
+++ b/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
@@ -1,6 +1,8 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`traverses directory tree up until it finds jest.config 1`] = `
+Jest: Loading the TS config file: /Users/david/Projects/Gamote/Libraries/jest/e2e/jest.config.ts/jest.config.ts
+Jest: Loading the TS config file: /Users/david/Projects/Gamote/Libraries/jest/e2e/jest.config.ts/jest.config.ts
   console.log
 <<REPLACED>>/jest.config.ts/some/nested/directory
 
diff --git a/e2e/__tests__/jest.config.ts.test.ts b/e2e/__tests__/jest.config.ts.test.ts
index ff71917137a5..fef7250ac3b3 100644
--- a/e2e/__tests__/jest.config.ts.test.ts
+++ b/e2e/__tests__/jest.config.ts.test.ts
@@ -18,7 +18,7 @@ afterAll(() => cleanup(DIR));
 test('works with jest.config.ts', () => {
   writeFiles(DIR, {
     '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
-    'jest.config.ts': `module.exports = {testRegex: '.*-giraffe.js'};`,
+    'jest.config.ts': `export default {testRegex: '.*-giraffe.js'};`,
     'package.json': '{}',
   });
 
@@ -36,7 +36,7 @@ test('traverses directory tree up until it finds jest.config', () => {
     test('giraffe', () => expect(1).toBe(1));
     test('abc', () => console.log(slash(process.cwd())));
     `,
-    'jest.config.ts': `module.exports = {testRegex: '.*-giraffe.js'};`,
+    'jest.config.ts': `export default {testRegex: '.*-giraffe.js'};`,
     'package.json': '{}',
     'some/nested/directory/file.js': '// nothing special',
   });
@@ -61,11 +61,13 @@ test('traverses directory tree up until it finds jest.config', () => {
 test('invalid JS in jest.config.ts', () => {
   writeFiles(DIR, {
     '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
-    'jest.config.ts': `module.exports = i'll break this file yo`,
+    'jest.config.ts': `export default i'll break this file yo`,
     'package.json': '{}',
   });
 
   const {stderr, exitCode} = runJest(DIR, ['-w=1', '--ci=false']);
-  expect(stderr).toMatch('Error: Jest: Failed to parse config file ');
+  expect(stderr).toMatch(
+    'Error: Jest: Failed to parse the TypeScript config file ',
+  );
   expect(exitCode).toBe(1);
 });
diff --git a/package.json b/package.json
index 3af4c8c57840..e28af6c83b9c 100644
--- a/package.json
+++ b/package.json
@@ -77,6 +77,7 @@
     "strip-ansi": "^6.0.0",
     "tempy": "^0.6.0",
     "throat": "^5.0.0",
+    "ts-node": "^9.0.0",
     "type-fest": "^0.16.0",
     "typescript": "^4.0.2",
     "which": "^2.0.1"
diff --git a/packages/jest-config/package.json b/packages/jest-config/package.json
index ed3aa8a6a4af..a6da1009aa21 100644
--- a/packages/jest-config/package.json
+++ b/packages/jest-config/package.json
@@ -9,6 +9,9 @@
   "license": "MIT",
   "main": "build/index.js",
   "types": "build/index.d.ts",
+  "peerDependencies": {
+    "ts-node": "^9.0.0"
+  },
   "dependencies": {
     "@babel/core": "^7.1.0",
     "@jest/test-sequencer": "^26.4.2",
@@ -27,8 +30,7 @@
     "jest-util": "^26.3.0",
     "jest-validate": "^26.4.2",
     "micromatch": "^4.0.2",
-    "pretty-format": "^26.4.2",
-    "typescript": "^4.0.3"
+    "pretty-format": "^26.4.2"
   },
   "devDependencies": {
     "@types/babel__core": "^7.0.4",
diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index f00bd2b40495..e9548efcfeeb 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -9,7 +9,7 @@ import * as path from 'path';
 import {pathToFileURL} from 'url';
 import * as fs from 'graceful-fs';
 import type {Config} from '@jest/types';
-import {transpileModule} from 'typescript';
+import {interopRequireDefault} from './utils';
 // @ts-expect-error: vendored
 import jsonlint from './vendor/jsonlint';
 import {
@@ -32,18 +32,7 @@ export default async function readConfigFileAndSetRootDir(
 
   try {
     if (isTS) {
-      // Get the content of the TS config file
-      const tsConfigFileContent = fs.readFileSync(configPath, {
-        encoding: 'utf8',
-      });
-
-      // Convert the TS content to JS
-      const jsConfigFileContent = transpileModule(tsConfigFileContent, {})
-        .outputText;
-
-      // Execute the JS code to obtain the config
-      // eslint-disable-next-line no-eval
-      configObject = eval(jsConfigFileContent);
+      configObject = loadTSConfigFile(configPath);
     } else {
       configObject = require(configPath);
     }
@@ -71,11 +60,16 @@ export default async function readConfigFileAndSetRootDir(
 
         throw innerError;
       }
-    } else if (isTS || isJSON) {
+    } else if (isJSON) {
       throw new Error(
         `Jest: Failed to parse config file ${configPath}\n` +
           `  ${jsonlint.errors(fs.readFileSync(configPath, 'utf8'))}`,
       );
+    } else if (isTS) {
+      throw new Error(
+        `Jest: Failed to parse the TypeScript config file ${configPath}\n` +
+          `  ${error}`,
+      );
     } else {
       throw error;
     }
@@ -103,3 +97,33 @@ export default async function readConfigFileAndSetRootDir(
 
   return configObject;
 }
+
+// Load the TypeScript configuration
+const loadTSConfigFile = (configPath: Config.Path): Config.InitialOptions => {
+  console.info(`Jest: Loading the TS config file: ${configPath}`);
+
+  let registerer;
+
+  // Register TypeScript compiler instance
+  try {
+    registerer = require('ts-node').register();
+  } catch (e) {
+    if (e.code === 'MODULE_NOT_FOUND') {
+      throw new Error(
+        `Jest: 'ts-node' is required for the TypeScript configuration files. Make sure it is installed\nError: ${e.message}`,
+      );
+    }
+
+    throw new Error(
+      `Jest: Could not register 'ts-node' to read the TypeScript file: ${configPath}`,
+    );
+  }
+
+  registerer.enabled(true);
+
+  const configObject = interopRequireDefault(require(configPath)).default;
+
+  registerer.enabled(false);
+
+  return configObject;
+};
diff --git a/packages/jest-config/src/utils.ts b/packages/jest-config/src/utils.ts
index baa834fffcf9..ad69663235e0 100644
--- a/packages/jest-config/src/utils.ts
+++ b/packages/jest-config/src/utils.ts
@@ -248,3 +248,7 @@ export const getSequencer = (
     prefix: 'jest-sequencer-',
     rootDir,
   });
+
+// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
+export const interopRequireDefault = (obj: any): {default: any} =>
+  obj && obj.__esModule ? obj : {default: obj};
diff --git a/yarn.lock b/yarn.lock
index d39891853c33..892fe2152b44 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4367,6 +4367,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"arg@npm:^4.1.0":
+  version: 4.1.3
+  resolution: "arg@npm:4.1.3"
+  checksum: 81b3b40b1529c4fbf75b12f7c3e6fb2dcce9e78072063babc169de9b4f40777788f3d2b04380f659ef676a756e03ccfbfe78adf4477353bda906295fa69dab89
+  languageName: node
+  linkType: hard
+
 "argparse@npm:^1.0.10, argparse@npm:^1.0.7":
   version: 1.0.10
   resolution: "argparse@npm:1.0.10"
@@ -11445,6 +11452,8 @@ fsevents@^1.2.7:
     jest-validate: ^26.4.2
     micromatch: ^4.0.2
     pretty-format: ^26.4.2
+  peerDependencies:
+    ts-node: ^9.0.0
   languageName: unknown
   linkType: soft
 
@@ -13029,6 +13038,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"make-error@npm:^1.1.1":
+  version: 1.3.6
+  resolution: "make-error@npm:1.3.6"
+  checksum: 2c780bab8409b865e8ee86697c599a2bf2765ec64d21eb67ccda27050e039f983feacad05a0d43aba3c966ea03d305d2612e94fec45474bcbc61181f57c5bb88
+  languageName: node
+  linkType: hard
+
 "make-fetch-happen@npm:^5.0.0":
   version: 5.0.2
   resolution: "make-fetch-happen@npm:5.0.2"
@@ -17097,6 +17113,7 @@ fsevents@^1.2.7:
     strip-ansi: ^6.0.0
     tempy: ^0.6.0
     throat: ^5.0.0
+    ts-node: ^9.0.0
     type-fest: ^0.16.0
     typescript: ^4.0.2
     which: ^2.0.1
@@ -17732,7 +17749,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"source-map-support@npm:^0.5.16":
+"source-map-support@npm:^0.5.16, source-map-support@npm:^0.5.17":
   version: 0.5.19
   resolution: "source-map-support@npm:0.5.19"
   dependencies:
@@ -18908,6 +18925,26 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"ts-node@npm:^9.0.0":
+  version: 9.0.0
+  resolution: "ts-node@npm:9.0.0"
+  dependencies:
+    arg: ^4.1.0
+    diff: ^4.0.1
+    make-error: ^1.1.1
+    source-map-support: ^0.5.17
+    yn: 3.1.1
+  peerDependencies:
+    typescript: ">=2.7"
+  bin:
+    ts-node: dist/bin.js
+    ts-node-script: dist/bin-script.js
+    ts-node-transpile-only: dist/bin-transpile.js
+    ts-script: dist/bin-script-deprecated.js
+  checksum: 49d2ab087fc4b93f0a292e426ea6d242a80d1a4809ac008758bb0170aea1a85cd4182792c1d70889285fe5328cd8bd1ffb1e5108d1c4f31c39dbe9151ea4cabe
+  languageName: node
+  linkType: hard
+
 "tsconfig-paths@npm:^3.9.0":
   version: 3.9.0
   resolution: "tsconfig-paths@npm:3.9.0"
@@ -20217,6 +20254,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"yn@npm:3.1.1":
+  version: 3.1.1
+  resolution: "yn@npm:3.1.1"
+  checksum: bff63b80568d80c711670935427494dde47cdf97e8b04196b140ce0af519c81c5ee857eddad0caa8b422dd65aea0157bbfaacbb1546bebba623f0f383d5d9ae5
+  languageName: node
+  linkType: hard
+
 "zone.js@npm:~0.10.2":
   version: 0.10.3
   resolution: "zone.js@npm:0.10.3"

From 2ef46e2370d2699b61345eb8e4521caebdcb39e4 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 01:00:12 +0200
Subject: [PATCH 07/38] chore: Documentation updated to specify the 'ts-node'
 peer dependency of the `jest.config.ts` functionality

---
 docs/Configuration.md                                | 6 ++++--
 website/versioned_docs/version-26.4/Configuration.md | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/docs/Configuration.md b/docs/Configuration.md
index cfdee2d3f768..c23c73b612ce 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -3,7 +3,7 @@ id: configuration
 title: Configuring Jest
 ---
 
-Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
+Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js`, or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
 
 ```json
 {
@@ -33,6 +33,8 @@ module.exports = async () => {
 
 Or through TypeScript:
 
+You can enable support for the TypeScript configuration file by installing the `ts-node` plugin in your project.
+
 ```ts
 // jest.config.ts
 import type { Config } from '@jest/types';
@@ -41,7 +43,7 @@ import type { Config } from '@jest/types';
 const config: Config.InitialOptions = {
   verbose: true
 };
-export = config;
+export default config;
 
 //Or async function
 export default async (): Promise<Config.InitialOptions> => {
diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index 901a5ac8fd67..96dd6d2eb75d 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -4,7 +4,7 @@ title: Configuring Jest
 original_id: configuration
 ---
 
-Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
+Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js`, or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
 
 ```json
 {
@@ -34,6 +34,8 @@ module.exports = async () => {
 
 Or through TypeScript:
 
+You can enable support for the TypeScript configuration file by installing the `ts-node` plugin in your project.
+
 ```ts
 // jest.config.ts
 import type { Config } from '@jest/types';
@@ -42,7 +44,7 @@ import type { Config } from '@jest/types';
 const config: Config.InitialOptions = {
   verbose: true
 };
-export = config;
+export default config;
 
 //Or async function
 export default async (): Promise<Config.InitialOptions> => {

From 9bc45043d889e34577077c383fd9f6e7678306f9 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 01:17:07 +0200
Subject: [PATCH 08/38] fix: Prettier errors

---
 docs/Configuration.md                                | 4 ++--
 website/versioned_docs/version-26.4/Configuration.md | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/Configuration.md b/docs/Configuration.md
index c23c73b612ce..ee5980732aee 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -37,11 +37,11 @@ You can enable support for the TypeScript configuration file by installing the `
 
 ```ts
 // jest.config.ts
-import type { Config } from '@jest/types';
+import type {Config} from '@jest/types';
 
 //Sync object
 const config: Config.InitialOptions = {
-  verbose: true
+  verbose: true,
 };
 export default config;
 
diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index 96dd6d2eb75d..7b4597a0cc2f 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -38,11 +38,11 @@ You can enable support for the TypeScript configuration file by installing the `
 
 ```ts
 // jest.config.ts
-import type { Config } from '@jest/types';
+import type {Config} from '@jest/types';
 
 //Sync object
 const config: Config.InitialOptions = {
-  verbose: true
+  verbose: true,
 };
 export default config;
 

From 5674532cdc0be5952ca8f0a01827c1ecd12ad863 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 01:22:10 +0200
Subject: [PATCH 09/38] fix: Remove console logs to avoid them to be captured
 in snapshots

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 2 --
 1 file changed, 2 deletions(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index e9548efcfeeb..756a0193cd22 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -100,8 +100,6 @@ export default async function readConfigFileAndSetRootDir(
 
 // Load the TypeScript configuration
 const loadTSConfigFile = (configPath: Config.Path): Config.InitialOptions => {
-  console.info(`Jest: Loading the TS config file: ${configPath}`);
-
   let registerer;
 
   // Register TypeScript compiler instance

From de5766ba6675e5b762546fc464dcb5745f064a36 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 01:52:50 +0200
Subject: [PATCH 10/38] fix: Remove console logs to avoid them to be captured
 in snapshots

---
 e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap | 2 --
 1 file changed, 2 deletions(-)

diff --git a/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap b/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
index 759244e10052..231d926a36de 100644
--- a/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
+++ b/e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap
@@ -1,8 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`traverses directory tree up until it finds jest.config 1`] = `
-Jest: Loading the TS config file: /Users/david/Projects/Gamote/Libraries/jest/e2e/jest.config.ts/jest.config.ts
-Jest: Loading the TS config file: /Users/david/Projects/Gamote/Libraries/jest/e2e/jest.config.ts/jest.config.ts
   console.log
 <<REPLACED>>/jest.config.ts/some/nested/directory
 

From c9069fdb25b5afb6abf0747b7e991cb2100634d2 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 02:23:36 +0200
Subject: [PATCH 11/38] fix: Added 'testEnvironment' in the `jest.config.ts`
 tests to fix the 'ReferenceError: globalThis is not defined' on Node 10.x
 (https://github.com/nrwl/nx/issues/3776#issuecomment-699013760)

---
 e2e/__tests__/jest.config.ts.test.ts |   4 +-
 package.json                         |   1 +
 yarn.lock                            | 313 +++++++++++++++++++++++++--
 3 files changed, 294 insertions(+), 24 deletions(-)

diff --git a/e2e/__tests__/jest.config.ts.test.ts b/e2e/__tests__/jest.config.ts.test.ts
index fef7250ac3b3..07d20129cd41 100644
--- a/e2e/__tests__/jest.config.ts.test.ts
+++ b/e2e/__tests__/jest.config.ts.test.ts
@@ -18,7 +18,7 @@ afterAll(() => cleanup(DIR));
 test('works with jest.config.ts', () => {
   writeFiles(DIR, {
     '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
-    'jest.config.ts': `export default {testRegex: '.*-giraffe.js'};`,
+    'jest.config.ts': `export default {testEnvironment: 'jest-environment-jsdom-fifteen', testRegex: '.*-giraffe.js'};`,
     'package.json': '{}',
   });
 
@@ -36,7 +36,7 @@ test('traverses directory tree up until it finds jest.config', () => {
     test('giraffe', () => expect(1).toBe(1));
     test('abc', () => console.log(slash(process.cwd())));
     `,
-    'jest.config.ts': `export default {testRegex: '.*-giraffe.js'};`,
+    'jest.config.ts': `export default {testEnvironment: 'jest-environment-jsdom-fifteen', testRegex: '.*-giraffe.js'};`,
     'package.json': '{}',
     'some/nested/directory/file.js': '// nothing special',
   });
diff --git a/package.json b/package.json
index e28af6c83b9c..d9297a81075b 100644
--- a/package.json
+++ b/package.json
@@ -55,6 +55,7 @@
     "istanbul-lib-report": "^3.0.0",
     "istanbul-reports": "^3.0.0",
     "jest": "workspace:packages/jest",
+    "jest-environment-jsdom-fifteen": "^1.0.2",
     "jest-junit": "^11.0.1",
     "jest-runner-tsd": "^1.1.0",
     "jest-silent-reporter": "^0.2.1",
diff --git a/yarn.lock b/yarn.lock
index 892fe2152b44..b42a95a0fd61 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -135,7 +135,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/generator@npm:^7.11.5, @babel/generator@npm:^7.11.6, @babel/generator@npm:^7.5.0":
+"@babel/generator@npm:^7.11.5, @babel/generator@npm:^7.11.6, @babel/generator@npm:^7.4.0, @babel/generator@npm:^7.5.0":
   version: 7.11.6
   resolution: "@babel/generator@npm:7.11.6"
   dependencies:
@@ -430,7 +430,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/parser@npm:^7.0.0, @babel/parser@npm:^7.1.0, @babel/parser@npm:^7.10.4, @babel/parser@npm:^7.11.5, @babel/parser@npm:^7.7.0":
+"@babel/parser@npm:^7.0.0, @babel/parser@npm:^7.1.0, @babel/parser@npm:^7.10.4, @babel/parser@npm:^7.11.5, @babel/parser@npm:^7.4.3, @babel/parser@npm:^7.7.0":
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+  resolution: "@jest/environment@npm:24.9.0"
+  dependencies:
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+  languageName: node
+  linkType: hard
+
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   resolution: "@jest/fake-timers@workspace:packages/jest-fake-timers"
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+"@jest/transform@npm:^24.9.0":
+  version: 24.9.0
+  resolution: "@jest/transform@npm:24.9.0"
+  dependencies:
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+    "@jest/types": ^24.9.0
+    babel-plugin-istanbul: ^5.1.0
+    chalk: ^2.0.1
+    convert-source-map: ^1.4.0
+    fast-json-stable-stringify: ^2.0.0
+    graceful-fs: ^4.1.15
+    jest-haste-map: ^24.9.0
+    jest-regex-util: ^24.9.0
+    jest-util: ^24.9.0
+    micromatch: ^3.1.10
+    pirates: ^4.0.1
+    realpath-native: ^1.1.0
+    slash: ^2.0.0
+    source-map: ^0.6.1
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+  languageName: node
+  linkType: hard
+
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   resolution: "@jest/types@workspace:packages/jest-types"
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-"@jest/types@npm:^24.9.0":
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-"abab@npm:^2.0.3":
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@@ -4002,6 +4038,16 @@ __metadata:
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+"acorn-globals@npm:^4.3.2":
+  version: 4.3.4
+  resolution: "acorn-globals@npm:4.3.4"
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+    acorn-walk: ^6.0.1
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+  languageName: node
+  linkType: hard
+
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   resolution: "acorn-globals@npm:6.0.0"
@@ -4021,6 +4067,13 @@ __metadata:
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+"acorn-walk@npm:^6.0.1":
+  version: 6.2.0
+  resolution: "acorn-walk@npm:6.2.0"
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+  languageName: node
+  linkType: hard
+
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   resolution: "acorn-walk@npm:7.2.0"
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   linkType: hard
 
-"acorn@npm:^7.1.1, acorn@npm:^7.4.0":
+"acorn@npm:^6.0.1":
+  version: 6.4.1
+  resolution: "acorn@npm:6.4.1"
+  bin:
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+  languageName: node
+  linkType: hard
+
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@@ -4445,6 +4507,13 @@ __metadata:
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+"array-equal@npm:^1.0.0":
+  version: 1.0.0
+  resolution: "array-equal@npm:1.0.0"
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+  languageName: node
+  linkType: hard
+
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   resolution: "array-filter@npm:1.0.0"
@@ -4781,6 +4850,18 @@ __metadata:
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+"babel-plugin-istanbul@npm:^5.1.0":
+  version: 5.2.0
+  resolution: "babel-plugin-istanbul@npm:5.2.0"
+  dependencies:
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+    find-up: ^3.0.0
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+  languageName: node
+  linkType: hard
+
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   resolution: "babel-plugin-istanbul@npm:6.0.0"
@@ -6709,7 +6790,7 @@ __metadata:
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-"cssom@npm:^0.4.4":
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-"cssstyle@npm:^2.2.0":
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   resolution: "cssstyle@npm:2.3.0"
   dependencies:
@@ -6780,6 +6861,17 @@ __metadata:
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+"data-urls@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "data-urls@npm:1.1.0"
+  dependencies:
+    abab: ^2.0.0
+    whatwg-mimetype: ^2.2.0
+    whatwg-url: ^7.0.0
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+  languageName: node
+  linkType: hard
+
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   resolution: "data-urls@npm:2.0.0"
@@ -7317,6 +7409,15 @@ __metadata:
   languageName: node
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+"domexception@npm:^1.0.1":
+  version: 1.0.1
+  resolution: "domexception@npm:1.0.1"
+  dependencies:
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+  languageName: node
+  linkType: hard
+
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   resolution: "domexception@npm:2.0.1"
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-"escodegen@npm:^1.14.1":
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   resolution: "escodegen@npm:1.14.3"
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@@ -10070,6 +10171,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"html-encoding-sniffer@npm:^1.0.2":
+  version: 1.0.2
+  resolution: "html-encoding-sniffer@npm:1.0.2"
+  dependencies:
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+  checksum: fff1462d9845f08315b41a19b3deaeebf465b4abc44c12218ee2be42a4655dec18b8ca4ae2ea72270d564164a3092b9a72701c1c529777e378036a49c4f6bc80
+  languageName: node
+  linkType: hard
+
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   resolution: "html-encoding-sniffer@npm:2.0.1"
@@ -11290,6 +11400,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"istanbul-lib-coverage@npm:^2.0.5":
+  version: 2.0.5
+  resolution: "istanbul-lib-coverage@npm:2.0.5"
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+  languageName: node
+  linkType: hard
+
 "istanbul-lib-coverage@npm:^3.0.0":
   version: 3.0.0
   resolution: "istanbul-lib-coverage@npm:3.0.0"
@@ -11297,6 +11414,21 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"istanbul-lib-instrument@npm:^3.3.0":
+  version: 3.3.0
+  resolution: "istanbul-lib-instrument@npm:3.3.0"
+  dependencies:
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+    "@babel/types": ^7.4.0
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+    semver: ^6.0.0
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+  languageName: node
+  linkType: hard
+
 "istanbul-lib-instrument@npm:^4.0.0, istanbul-lib-instrument@npm:^4.0.3":
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   resolution: "istanbul-lib-instrument@npm:4.0.3"
@@ -11491,6 +11623,20 @@ fsevents@^1.2.7:
   languageName: unknown
   linkType: soft
 
+"jest-environment-jsdom-fifteen@npm:^1.0.2":
+  version: 1.0.2
+  resolution: "jest-environment-jsdom-fifteen@npm:1.0.2"
+  dependencies:
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+    "@jest/types": ^24.3.0
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+  languageName: node
+  linkType: hard
+
 "jest-environment-jsdom@^26.3.0, jest-environment-jsdom@workspace:packages/jest-environment-jsdom":
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   resolution: "jest-environment-jsdom@workspace:packages/jest-environment-jsdom"
@@ -11562,7 +11708,7 @@ fsevents@^1.2.7:
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-"jest-haste-map@npm:^24.7.1":
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-"jest-mock@npm:^24.9.0":
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   dependencies:
@@ -11728,6 +11874,13 @@ fsevents@^1.2.7:
   languageName: unknown
   linkType: soft
 
+"jest-regex-util@npm:^24.9.0":
+  version: 24.9.0
+  resolution: "jest-regex-util@npm:24.9.0"
+  checksum: 3a30d04bcfd779397d38c6b663c0e45492bba83908c57d3498bd682aa4dd299565edb7620e38de2225c19bc06ad8febfb268101494caee39b08c1d1493050a8d
+  languageName: node
+  linkType: hard
+
 "jest-repl@workspace:packages/jest-repl":
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   resolution: "jest-repl@workspace:packages/jest-repl"
@@ -12169,6 +12322,45 @@ fsevents@^1.2.7:
   languageName: node
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+"jsdom@npm:^15.2.1":
+  version: 15.2.1
+  resolution: "jsdom@npm:15.2.1"
+  dependencies:
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+    acorn: ^7.1.0
+    acorn-globals: ^4.3.2
+    array-equal: ^1.0.0
+    cssom: ^0.4.1
+    cssstyle: ^2.0.0
+    data-urls: ^1.1.0
+    domexception: ^1.0.1
+    escodegen: ^1.11.1
+    html-encoding-sniffer: ^1.0.2
+    nwsapi: ^2.2.0
+    parse5: 5.1.0
+    pn: ^1.1.0
+    request: ^2.88.0
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+    symbol-tree: ^3.2.2
+    tough-cookie: ^3.0.1
+    w3c-hr-time: ^1.0.1
+    w3c-xmlserializer: ^1.1.2
+    webidl-conversions: ^4.0.2
+    whatwg-encoding: ^1.0.5
+    whatwg-mimetype: ^2.3.0
+    whatwg-url: ^7.0.0
+    ws: ^7.0.0
+    xml-name-validator: ^3.0.0
+  peerDependencies:
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+  peerDependenciesMeta:
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+  languageName: node
+  linkType: hard
+
 "jsdom@npm:^16.2.2":
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   resolution: "jsdom@npm:16.4.0"
@@ -15106,6 +15298,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"parse5@npm:5.1.0":
+  version: 5.1.0
+  resolution: "parse5@npm:5.1.0"
+  checksum: f82ab2581011704c1dd3f56fa9509904a169d06bee8d4154d40a774335ad158bc59693c6620d29093252ad120521302ff25b257bcc9aebbe12453f74659a5d65
+  languageName: node
+  linkType: hard
+
 "parse5@npm:5.1.1":
   version: 5.1.1
   resolution: "parse5@npm:5.1.1"
@@ -15380,6 +15579,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"pn@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "pn@npm:1.1.0"
+  checksum: 7df19be13c86dfab22e8484590480e49d496b270430a731be0bb40cea8a16c29e45188a7303d7c57b7140754f807877b0c10aa95400ad30a7ad4fb3f7d132381
+  languageName: node
+  linkType: hard
+
 "portfinder@npm:^1.0.25":
   version: 1.0.28
   resolution: "portfinder@npm:1.0.28"
@@ -16398,6 +16604,16 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"read-pkg-up@npm:^4.0.0":
+  version: 4.0.0
+  resolution: "read-pkg-up@npm:4.0.0"
+  dependencies:
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+    read-pkg: ^3.0.0
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+  languageName: node
+  linkType: hard
+
 "read-pkg-up@npm:^7.0.0, read-pkg-up@npm:^7.0.1":
   version: 7.0.1
   resolution: "read-pkg-up@npm:7.0.1"
@@ -16521,6 +16737,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"realpath-native@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "realpath-native@npm:1.1.0"
+  dependencies:
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+  languageName: node
+  linkType: hard
+
 "rechoir@npm:^0.6.2":
   version: 0.6.2
   resolution: "rechoir@npm:0.6.2"
@@ -16794,7 +17019,7 @@ fsevents@^1.2.7:
   languageName: node
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-"request-promise-native@npm:^1.0.8":
+"request-promise-native@npm:^1.0.7, request-promise-native@npm:^1.0.8":
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   resolution: "request-promise-native@npm:1.0.9"
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@@ -17091,6 +17316,7 @@ fsevents@^1.2.7:
     istanbul-lib-report: ^3.0.0
     istanbul-reports: ^3.0.0
     jest: "workspace:packages/jest"
+    jest-environment-jsdom-fifteen: ^1.0.2
     jest-junit: ^11.0.1
     jest-runner-tsd: ^1.1.0
     jest-silent-reporter: ^0.2.1
@@ -17266,6 +17492,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"saxes@npm:^3.1.9":
+  version: 3.1.11
+  resolution: "saxes@npm:3.1.11"
+  dependencies:
+    xmlchars: ^2.1.1
+  checksum: dbdbd14f903e2a18c3efb422401ad0630dd25e4ed6a52fd01e42b205508ee70e5170da4d39ab2957eca54dc2934b9c8fa6f2f90292b136bfa935db7877177a08
+  languageName: node
+  linkType: hard
+
 "saxes@npm:^5.0.0":
   version: 5.0.1
   resolution: "saxes@npm:5.0.1"
@@ -18397,7 +18632,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"symbol-tree@npm:^3.2.4":
+"symbol-tree@npm:^3.2.2, symbol-tree@npm:^3.2.4":
   version: 3.2.4
   resolution: "symbol-tree@npm:3.2.4"
   checksum: 0b9af4e5f005f9f0b9c916d91a1b654422ffa49ef09c5c4b6efa7a778f63976be9f410e57db1e9ea7576eea0631a34b69a5622674aa92a60a896ccf2afca87a7
@@ -18580,6 +18815,18 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"test-exclude@npm:^5.2.3":
+  version: 5.2.3
+  resolution: "test-exclude@npm:5.2.3"
+  dependencies:
+    glob: ^7.1.3
+    minimatch: ^3.0.4
+    read-pkg-up: ^4.0.0
+    require-main-filename: ^2.0.0
+  checksum: d441f2531cf102d267de7f4ceecb4eacc8de2a6703abbab20591d0e8b30877a0e4cdcb88f88bd292f36950feda87b25e159e2fd407c275b13cce15a2a56eefaf
+  languageName: node
+  linkType: hard
+
 "test-exclude@npm:^6.0.0":
   version: 6.0.0
   resolution: "test-exclude@npm:6.0.0"
@@ -19493,7 +19740,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"util.promisify@npm:~1.0.0":
+"util.promisify@npm:^1.0.0, util.promisify@npm:~1.0.0":
   version: 1.0.1
   resolution: "util.promisify@npm:1.0.1"
   dependencies:
@@ -19627,7 +19874,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"w3c-hr-time@npm:^1.0.2":
+"w3c-hr-time@npm:^1.0.1, w3c-hr-time@npm:^1.0.2":
   version: 1.0.2
   resolution: "w3c-hr-time@npm:1.0.2"
   dependencies:
@@ -19636,6 +19883,17 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"w3c-xmlserializer@npm:^1.1.2":
+  version: 1.1.2
+  resolution: "w3c-xmlserializer@npm:1.1.2"
+  dependencies:
+    domexception: ^1.0.1
+    webidl-conversions: ^4.0.2
+    xml-name-validator: ^3.0.0
+  checksum: 9a7b5c7e32d4fa3d272a38e62595ff43169a9aa1b000d27a6b2613df759071034a8e870f7e6ebae8d0024d3056eeff1cad0fdab118ad4430c3d1cac3384dcd29
+  languageName: node
+  linkType: hard
+
 "w3c-xmlserializer@npm:^2.0.0":
   version: 2.0.0
   resolution: "w3c-xmlserializer@npm:2.0.0"
@@ -19714,7 +19972,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"whatwg-encoding@npm:^1.0.5":
+"whatwg-encoding@npm:^1.0.1, whatwg-encoding@npm:^1.0.5":
   version: 1.0.5
   resolution: "whatwg-encoding@npm:1.0.5"
   dependencies:
@@ -19737,7 +19995,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"whatwg-mimetype@npm:^2.3.0":
+"whatwg-mimetype@npm:^2.2.0, whatwg-mimetype@npm:^2.3.0":
   version: 2.3.0
   resolution: "whatwg-mimetype@npm:2.3.0"
   checksum: 926e6ef8c7e53d158e501ce5e3c0e491d343c3c97e71b3d30451ffe4b1d6f81844c336b46a446a0b4f3fe4f327d76e3451d53ee8055344a0f5f2f35b84518011
@@ -19901,6 +20159,17 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"write-file-atomic@npm:2.4.1":
+  version: 2.4.1
+  resolution: "write-file-atomic@npm:2.4.1"
+  dependencies:
+    graceful-fs: ^4.1.11
+    imurmurhash: ^0.1.4
+    signal-exit: ^3.0.2
+  checksum: d5a00706d00cb4a13bca748d85d4d149b9a997201cdbedc9162810c9ac04188e191b1b06ca868df670db972ae9dbd4022a4eff2aec0c7dce73376dccb6d4efab
+  languageName: node
+  linkType: hard
+
 "write-file-atomic@npm:^1.2.0":
   version: 1.3.4
   resolution: "write-file-atomic@npm:1.3.4"
@@ -19992,7 +20261,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"ws@npm:^7, ws@npm:^7.2.3":
+"ws@npm:^7, ws@npm:^7.0.0, ws@npm:^7.2.3":
   version: 7.3.1
   resolution: "ws@npm:7.3.1"
   peerDependencies:
@@ -20070,7 +20339,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"xmlchars@npm:^2.2.0":
+"xmlchars@npm:^2.1.1, xmlchars@npm:^2.2.0":
   version: 2.2.0
   resolution: "xmlchars@npm:2.2.0"
   checksum: 69bbb61e8d939873c8aa7d006d082944de2eb6f12f55e53fdfc670d544e677736b59e498ece303f264bd1dc39b77557eef1c1c9bfb09eb5e1e30ac552420d81e

From 2cf29337773afbc2e92a37512cbe8b13cfadd557 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 09:21:06 +0200
Subject: [PATCH 12/38] chore: `interopRequireDefault` was moved to save an
 import

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 5 ++++-
 packages/jest-config/src/utils.ts                       | 4 ----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 756a0193cd22..4c1a0114b4dd 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -9,7 +9,6 @@ import * as path from 'path';
 import {pathToFileURL} from 'url';
 import * as fs from 'graceful-fs';
 import type {Config} from '@jest/types';
-import {interopRequireDefault} from './utils';
 // @ts-expect-error: vendored
 import jsonlint from './vendor/jsonlint';
 import {
@@ -100,6 +99,10 @@ export default async function readConfigFileAndSetRootDir(
 
 // Load the TypeScript configuration
 const loadTSConfigFile = (configPath: Config.Path): Config.InitialOptions => {
+  // Helper to normalize module's return value
+  const interopRequireDefault = (obj: any): {default: any} =>
+    obj && obj.__esModule ? obj : {default: obj};
+
   let registerer;
 
   // Register TypeScript compiler instance
diff --git a/packages/jest-config/src/utils.ts b/packages/jest-config/src/utils.ts
index ad69663235e0..baa834fffcf9 100644
--- a/packages/jest-config/src/utils.ts
+++ b/packages/jest-config/src/utils.ts
@@ -248,7 +248,3 @@ export const getSequencer = (
     prefix: 'jest-sequencer-',
     rootDir,
   });
-
-// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
-export const interopRequireDefault = (obj: any): {default: any} =>
-  obj && obj.__esModule ? obj : {default: obj};

From 144c341a8decc500ffeb86f13be5eea69b13b649 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 09:23:13 +0200
Subject: [PATCH 13/38] chore: better comments for
 `readConfigFileAndSetRootDir`

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 4c1a0114b4dd..6fac36aebd92 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -19,7 +19,7 @@ import {
 
 // Read the configuration and set its `rootDir`
 // 1. If it's a `package.json` file, we look into its "jest" property
-// 2. If it's a `jest.config.ts` file, we convert it in JS and we parse it
+// 2. // 2. If it's a `jest.config.ts` file, we use `ts-node` to transpile & require it
 // 3. For any other file, we just require it. If we receive an 'ERR_REQUIRE_ESM'
 //    from node, perform a dynamic import instead.
 export default async function readConfigFileAndSetRootDir(

From 8fa7b6190f41169f6c501466f766361878b3a14c Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 09:26:07 +0200
Subject: [PATCH 14/38] chore: indicate that `ts-node` is optional via
 'peerDependenciesMeta'

---
 packages/jest-config/package.json | 5 +++++
 yarn.lock                         | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/packages/jest-config/package.json b/packages/jest-config/package.json
index a6da1009aa21..2fe3997e2d65 100644
--- a/packages/jest-config/package.json
+++ b/packages/jest-config/package.json
@@ -12,6 +12,11 @@
   "peerDependencies": {
     "ts-node": "^9.0.0"
   },
+  "peerDependenciesMeta": {
+    "ts-node": {
+      "optional": true
+    }
+  },
   "dependencies": {
     "@babel/core": "^7.1.0",
     "@jest/test-sequencer": "^26.4.2",
diff --git a/yarn.lock b/yarn.lock
index b42a95a0fd61..ed9107e76989 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11586,6 +11586,9 @@ fsevents@^1.2.7:
     pretty-format: ^26.4.2
   peerDependencies:
     ts-node: ^9.0.0
+  peerDependenciesMeta:
+    ts-node:
+      optional: true
   languageName: unknown
   linkType: soft
 

From d8724e64f108e3be26abad895b6b4b77e8a76374 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Wed, 30 Sep 2020 09:30:14 +0200
Subject: [PATCH 15/38] chore: Updated documentation

---
 docs/Configuration.md                                | 4 +---
 website/versioned_docs/version-26.4/Configuration.md | 4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/docs/Configuration.md b/docs/Configuration.md
index ee5980732aee..552c7b28310f 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -31,9 +31,7 @@ module.exports = async () => {
 };
 ```
 
-Or through TypeScript:
-
-You can enable support for the TypeScript configuration file by installing the `ts-node` plugin in your project.
+Or through TypeScript (if `ts-node` is installed):
 
 ```ts
 // jest.config.ts
diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index 7b4597a0cc2f..fa7d003bdead 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -32,9 +32,7 @@ module.exports = async () => {
 };
 ```
 
-Or through TypeScript:
-
-You can enable support for the TypeScript configuration file by installing the `ts-node` plugin in your project.
+Or through TypeScript (if `ts-node` is installed):
 
 ```ts
 // jest.config.ts

From a5033aac1ddb6f292c7a2a102da970cf8ea53b30 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Fri, 2 Oct 2020 09:54:36 +0200
Subject: [PATCH 16/38] chore: tests was added to be sure that the types are
 checked in the `jest.config.ts` file

---
 e2e/__tests__/jest.config.ts.test.ts                 | 12 ++++++++++++
 .../jest-config/src/readConfigFileAndSetRootDir.ts   |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/e2e/__tests__/jest.config.ts.test.ts b/e2e/__tests__/jest.config.ts.test.ts
index 07d20129cd41..13f18406eaf2 100644
--- a/e2e/__tests__/jest.config.ts.test.ts
+++ b/e2e/__tests__/jest.config.ts.test.ts
@@ -58,6 +58,18 @@ test('traverses directory tree up until it finds jest.config', () => {
   expect(wrap(summary)).toMatchSnapshot();
 });
 
+test('it does type check the config', () => {
+  writeFiles(DIR, {
+    '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
+    'jest.config.ts': `export default { testTimeout: "10000" }`,
+    'package.json': '{}',
+  });
+
+  const {stderr, exitCode} = runJest(DIR, ['-w=1', '--ci=false']);
+  expect(stderr).toMatch('must be of type');
+  expect(exitCode).toBe(1);
+});
+
 test('invalid JS in jest.config.ts', () => {
   writeFiles(DIR, {
     '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 6fac36aebd92..0186fc7852f2 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -19,7 +19,7 @@ import {
 
 // Read the configuration and set its `rootDir`
 // 1. If it's a `package.json` file, we look into its "jest" property
-// 2. // 2. If it's a `jest.config.ts` file, we use `ts-node` to transpile & require it
+// 2. If it's a `jest.config.ts` file, we use `ts-node` to transpile & require it
 // 3. For any other file, we just require it. If we receive an 'ERR_REQUIRE_ESM'
 //    from node, perform a dynamic import instead.
 export default async function readConfigFileAndSetRootDir(

From 4d49437de6482104221fea7e9a38533574513045 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Fri, 2 Oct 2020 13:29:11 +0200
Subject: [PATCH 17/38] chore: Update the fixture for `jest.config.ts` to use
 'default'

---
 .../__tests__/fixtures/has_jest_config_file_ts/jest.config.ts   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts b/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts
index 2da8322a7f9b..d291155b7a10 100644
--- a/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts
+++ b/packages/jest-cli/src/init/__tests__/fixtures/has_jest_config_file_ts/jest.config.ts
@@ -5,4 +5,4 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-export = {};
+export default {};

From e0b52706d89441254ac6690106303bf861c07cb0 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 09:48:51 +0200
Subject: [PATCH 18/38] chore: (ts-node) allow for majors higher than 9

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index f214845d4bee..04a813ccb4d6 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "strip-ansi": "^6.0.0",
     "tempy": "^0.6.0",
     "throat": "^5.0.0",
-    "ts-node": "^9.0.0",
+    "ts-node": ">=9.0.0",
     "type-fest": "^0.16.0",
     "typescript": "^4.0.2",
     "which": "^2.0.1"

From 0d6f2ca4c656064b0ff6d84bd9c4b7947b85c2d1 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 10:12:33 +0200
Subject: [PATCH 19/38] chore: revert changes in the 26.4 documentation

---
 .../version-26.4/Configuration.md             | 22 +------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/website/versioned_docs/version-26.4/Configuration.md b/website/versioned_docs/version-26.4/Configuration.md
index 67a4f19a57bb..15b255b04fee 100644
--- a/website/versioned_docs/version-26.4/Configuration.md
+++ b/website/versioned_docs/version-26.4/Configuration.md
@@ -4,7 +4,7 @@ title: Configuring Jest
 original_id: configuration
 ---
 
-Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js`, or `jest.config.ts` file or through the `--config <path/to/file.js|ts|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
+Jest's configuration can be defined in the `package.json` file of your project, or through a `jest.config.js` file or through the `--config <path/to/file.js|cjs|mjs|json>` option. If you'd like to use your `package.json` to store Jest's config, the `"jest"` key should be used on the top level so Jest will know how to find your settings:
 
 ```json
 {
@@ -32,26 +32,6 @@ module.exports = async () => {
 };
 ```
 
-Or through TypeScript (if `ts-node` is installed):
-
-```ts
-// jest.config.ts
-import type {Config} from '@jest/types';
-
-//Sync object
-const config: Config.InitialOptions = {
-  verbose: true,
-};
-export default config;
-
-//Or async function
-export default async (): Promise<Config.InitialOptions> => {
-  return {
-    verbose: true,
-  };
-};
-```
-
 Please keep in mind that the resulting configuration must be JSON-serializable.
 
 When using the `--config` option, the JSON file must not contain a "jest" key:

From a291af25ba7b31510330fc512c0b51aabb18bc90 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 10:14:07 +0200
Subject: [PATCH 20/38] chore: updated the return of 'loadTSConfigFile'

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 0186fc7852f2..27b2663a7807 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -98,7 +98,9 @@ export default async function readConfigFileAndSetRootDir(
 }
 
 // Load the TypeScript configuration
-const loadTSConfigFile = (configPath: Config.Path): Config.InitialOptions => {
+const loadTSConfigFile = (
+  configPath: Config.Path,
+): Config.InitialOptions | Promise<Config.InitialOptions> => {
   // Helper to normalize module's return value
   const interopRequireDefault = (obj: any): {default: any} =>
     obj && obj.__esModule ? obj : {default: obj};

From 5d4065eceef8362a1b1895d6b25219894aff42ac Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 10:17:19 +0200
Subject: [PATCH 21/38] chore: replace local 'interopRequireDefault' with the
 one defined in 'jest-util'

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 27b2663a7807..2745a1accdf7 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -9,6 +9,7 @@ import * as path from 'path';
 import {pathToFileURL} from 'url';
 import * as fs from 'graceful-fs';
 import type {Config} from '@jest/types';
+import {interopRequireDefault} from 'jest-util';
 // @ts-expect-error: vendored
 import jsonlint from './vendor/jsonlint';
 import {
@@ -101,10 +102,6 @@ export default async function readConfigFileAndSetRootDir(
 const loadTSConfigFile = (
   configPath: Config.Path,
 ): Config.InitialOptions | Promise<Config.InitialOptions> => {
-  // Helper to normalize module's return value
-  const interopRequireDefault = (obj: any): {default: any} =>
-    obj && obj.__esModule ? obj : {default: obj};
-
   let registerer;
 
   // Register TypeScript compiler instance

From ee9569bd327628ff9bbc0dbdd29683d940aab1a1 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 10:35:47 +0200
Subject: [PATCH 22/38] chore: handle the case in which config is a function
 which imports more Typescript code

---
 .../jest-config/src/readConfigFileAndSetRootDir.ts    | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 2745a1accdf7..56652cbf49bf 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -99,9 +99,9 @@ export default async function readConfigFileAndSetRootDir(
 }
 
 // Load the TypeScript configuration
-const loadTSConfigFile = (
+const loadTSConfigFile = async (
   configPath: Config.Path,
-): Config.InitialOptions | Promise<Config.InitialOptions> => {
+): Promise<Config.InitialOptions> => {
   let registerer;
 
   // Register TypeScript compiler instance
@@ -121,7 +121,12 @@ const loadTSConfigFile = (
 
   registerer.enabled(true);
 
-  const configObject = interopRequireDefault(require(configPath)).default;
+  let configObject = interopRequireDefault(require(configPath)).default;
+
+  // In case the config is a function which imports more Typescript code
+  if (typeof configObject === 'function') {
+    configObject = await configObject();
+  }
 
   registerer.enabled(false);
 

From 91de77a358daa1424102156a52a62a971398712a Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 10:37:50 +0200
Subject: [PATCH 23/38] chore: let the consumers to deal with ts-node errors

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 56652cbf49bf..65a341093b87 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -114,9 +114,7 @@ const loadTSConfigFile = async (
       );
     }
 
-    throw new Error(
-      `Jest: Could not register 'ts-node' to read the TypeScript file: ${configPath}`,
-    );
+    throw e;
   }
 
   registerer.enabled(true);

From 2f165448908752ce2ab068b42646b0344bb223e3 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 10:39:35 +0200
Subject: [PATCH 24/38] chore: docs comments were updated

---
 docs/Configuration.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/Configuration.md b/docs/Configuration.md
index eca8a86bb22b..6daa5f26ceab 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -18,12 +18,12 @@ Or through JavaScript:
 
 ```js
 // jest.config.js
-//Sync object
+// Sync object
 module.exports = {
   verbose: true,
 };
 
-//Or async function
+// Or async function
 module.exports = async () => {
   return {
     verbose: true,
@@ -37,13 +37,13 @@ Or through TypeScript (if `ts-node` is installed):
 // jest.config.ts
 import type {Config} from '@jest/types';
 
-//Sync object
+// Sync object
 const config: Config.InitialOptions = {
   verbose: true,
 };
 export default config;
 
-//Or async function
+// Or async function
 export default async (): Promise<Config.InitialOptions> => {
   return {
     verbose: true,

From b551b29acf88578300e335ba0289905d6860f3d6 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 11:23:20 +0200
Subject: [PATCH 25/38] fix: tests were fixed after
 'readConfigFileAndSetRootDir' updates

---
 e2e/__tests__/jest.config.ts.test.ts                    | 4 +---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/e2e/__tests__/jest.config.ts.test.ts b/e2e/__tests__/jest.config.ts.test.ts
index 13f18406eaf2..53337662aa75 100644
--- a/e2e/__tests__/jest.config.ts.test.ts
+++ b/e2e/__tests__/jest.config.ts.test.ts
@@ -78,8 +78,6 @@ test('invalid JS in jest.config.ts', () => {
   });
 
   const {stderr, exitCode} = runJest(DIR, ['-w=1', '--ci=false']);
-  expect(stderr).toMatch(
-    'Error: Jest: Failed to parse the TypeScript config file ',
-  );
+  expect(stderr).toMatch('TSError: ⨯ Unable to compile TypeScript:');
   expect(exitCode).toBe(1);
 });
diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 65a341093b87..543ae17834bd 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -32,7 +32,7 @@ export default async function readConfigFileAndSetRootDir(
 
   try {
     if (isTS) {
-      configObject = loadTSConfigFile(configPath);
+      configObject = await loadTSConfigFile(configPath);
     } else {
       configObject = require(configPath);
     }

From 4ec1eb13c363e607fed8b3a31105f9b1ecef7010 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 11:38:09 +0200
Subject: [PATCH 26/38] chore: 'jest-environment-jsdom-fifteen' was replaced
 with 'jest-environment-node'

---
 e2e/__tests__/jest.config.ts.test.ts |   4 +-
 package.json                         |   2 +-
 yarn.lock                            | 318 +++------------------------
 3 files changed, 28 insertions(+), 296 deletions(-)

diff --git a/e2e/__tests__/jest.config.ts.test.ts b/e2e/__tests__/jest.config.ts.test.ts
index 53337662aa75..9b3edcef87ff 100644
--- a/e2e/__tests__/jest.config.ts.test.ts
+++ b/e2e/__tests__/jest.config.ts.test.ts
@@ -18,7 +18,7 @@ afterAll(() => cleanup(DIR));
 test('works with jest.config.ts', () => {
   writeFiles(DIR, {
     '__tests__/a-giraffe.js': `test('giraffe', () => expect(1).toBe(1));`,
-    'jest.config.ts': `export default {testEnvironment: 'jest-environment-jsdom-fifteen', testRegex: '.*-giraffe.js'};`,
+    'jest.config.ts': `export default {testEnvironment: 'jest-environment-node', testRegex: '.*-giraffe.js'};`,
     'package.json': '{}',
   });
 
@@ -36,7 +36,7 @@ test('traverses directory tree up until it finds jest.config', () => {
     test('giraffe', () => expect(1).toBe(1));
     test('abc', () => console.log(slash(process.cwd())));
     `,
-    'jest.config.ts': `export default {testEnvironment: 'jest-environment-jsdom-fifteen', testRegex: '.*-giraffe.js'};`,
+    'jest.config.ts': `export default {testEnvironment: 'jest-environment-node', testRegex: '.*-giraffe.js'};`,
     'package.json': '{}',
     'some/nested/directory/file.js': '// nothing special',
   });
diff --git a/package.json b/package.json
index 04a813ccb4d6..e2f13e536238 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "istanbul-lib-report": "^3.0.0",
     "istanbul-reports": "^3.0.0",
     "jest": "workspace:packages/jest",
-    "jest-environment-jsdom-fifteen": "^1.0.2",
+    "jest-environment-node": "^26.5.2",
     "jest-junit": "^12.0.0",
     "jest-runner-tsd": "^1.1.0",
     "jest-silent-reporter": "^0.2.1",
diff --git a/yarn.lock b/yarn.lock
index 42362f97b647..2fd39aa6c257 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -135,7 +135,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/generator@npm:^7.11.5, @babel/generator@npm:^7.11.6, @babel/generator@npm:^7.4.0, @babel/generator@npm:^7.5.0":
+"@babel/generator@npm:^7.11.5, @babel/generator@npm:^7.11.6, @babel/generator@npm:^7.5.0":
   version: 7.11.6
   resolution: "@babel/generator@npm:7.11.6"
   dependencies:
@@ -430,7 +430,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/parser@npm:^7.0.0, @babel/parser@npm:^7.1.0, @babel/parser@npm:^7.10.4, @babel/parser@npm:^7.11.5, @babel/parser@npm:^7.4.3, @babel/parser@npm:^7.7.0":
+"@babel/parser@npm:^7.0.0, @babel/parser@npm:^7.1.0, @babel/parser@npm:^7.10.4, @babel/parser@npm:^7.11.5, @babel/parser@npm:^7.7.0":
   version: 7.11.5
   resolution: "@babel/parser@npm:7.11.5"
   bin:
@@ -1523,7 +1523,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/template@npm:^7.0.0, @babel/template@npm:^7.10.4, @babel/template@npm:^7.3.3, @babel/template@npm:^7.4.0":
+"@babel/template@npm:^7.0.0, @babel/template@npm:^7.10.4, @babel/template@npm:^7.3.3":
   version: 7.10.4
   resolution: "@babel/template@npm:7.10.4"
   dependencies:
@@ -1534,7 +1534,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/traverse@npm:^7.0.0, @babel/traverse@npm:^7.1.0, @babel/traverse@npm:^7.10.4, @babel/traverse@npm:^7.11.5, @babel/traverse@npm:^7.3.4, @babel/traverse@npm:^7.4.3, @babel/traverse@npm:^7.7.0, @babel/traverse@npm:^7.9.0":
+"@babel/traverse@npm:^7.0.0, @babel/traverse@npm:^7.1.0, @babel/traverse@npm:^7.10.4, @babel/traverse@npm:^7.11.5, @babel/traverse@npm:^7.3.4, @babel/traverse@npm:^7.7.0, @babel/traverse@npm:^7.9.0":
   version: 7.11.5
   resolution: "@babel/traverse@npm:7.11.5"
   dependencies:
@@ -1551,7 +1551,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/types@npm:^7.0.0, @babel/types@npm:^7.10.4, @babel/types@npm:^7.10.5, @babel/types@npm:^7.11.0, @babel/types@npm:^7.11.5, @babel/types@npm:^7.3.0, @babel/types@npm:^7.3.3, @babel/types@npm:^7.4.0, @babel/types@npm:^7.4.4, @babel/types@npm:^7.7.0, @babel/types@npm:^7.8.3, @babel/types@npm:^7.9.0":
+"@babel/types@npm:^7.0.0, @babel/types@npm:^7.10.4, @babel/types@npm:^7.10.5, @babel/types@npm:^7.11.0, @babel/types@npm:^7.11.5, @babel/types@npm:^7.3.0, @babel/types@npm:^7.3.3, @babel/types@npm:^7.4.4, @babel/types@npm:^7.7.0, @babel/types@npm:^7.8.3, @babel/types@npm:^7.9.0":
   version: 7.11.5
   resolution: "@babel/types@npm:7.11.5"
   dependencies:
@@ -1827,18 +1827,6 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@jest/environment@npm:^24.3.0":
-  version: 24.9.0
-  resolution: "@jest/environment@npm:24.9.0"
-  dependencies:
-    "@jest/fake-timers": ^24.9.0
-    "@jest/transform": ^24.9.0
-    "@jest/types": ^24.9.0
-    jest-mock: ^24.9.0
-  checksum: 77f7313e1b913253b63edc5742aa9fa5e07f38d39b703d5f6246e4dd9778718b99313514c6245fe37791e64fd98fc7cc2fd12c98c75b05d916ec67a877d3943c
-  languageName: node
-  linkType: hard
-
 "@jest/fake-timers@^26.5.2, @jest/fake-timers@workspace:packages/jest-fake-timers":
   version: 0.0.0-use.local
   resolution: "@jest/fake-timers@workspace:packages/jest-fake-timers"
@@ -1853,7 +1841,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@jest/fake-timers@npm:^24.3.0, @jest/fake-timers@npm:^24.9.0":
+"@jest/fake-timers@npm:^24.9.0":
   version: 24.9.0
   resolution: "@jest/fake-timers@npm:24.9.0"
   dependencies:
@@ -2020,30 +2008,6 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@jest/transform@npm:^24.9.0":
-  version: 24.9.0
-  resolution: "@jest/transform@npm:24.9.0"
-  dependencies:
-    "@babel/core": ^7.1.0
-    "@jest/types": ^24.9.0
-    babel-plugin-istanbul: ^5.1.0
-    chalk: ^2.0.1
-    convert-source-map: ^1.4.0
-    fast-json-stable-stringify: ^2.0.0
-    graceful-fs: ^4.1.15
-    jest-haste-map: ^24.9.0
-    jest-regex-util: ^24.9.0
-    jest-util: ^24.9.0
-    micromatch: ^3.1.10
-    pirates: ^4.0.1
-    realpath-native: ^1.1.0
-    slash: ^2.0.0
-    source-map: ^0.6.1
-    write-file-atomic: 2.4.1
-  checksum: 73c5ad0ae6bae5c60261b6b256b995f099f84a964580537154293edc63ab0e9fb6e3dda737c04aafd9daa815f19b6fb437e611f4f811f8041bd37e8192709650
-  languageName: node
-  linkType: hard
-
 "@jest/types@^26.5.2, @jest/types@workspace:packages/jest-types":
   version: 0.0.0-use.local
   resolution: "@jest/types@workspace:packages/jest-types"
@@ -2056,7 +2020,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@jest/types@npm:^24.3.0, @jest/types@npm:^24.9.0":
+"@jest/types@npm:^24.9.0":
   version: 24.9.0
   resolution: "@jest/types@npm:24.9.0"
   dependencies:
@@ -4006,7 +3970,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"abab@npm:^2.0.0, abab@npm:^2.0.3":
+"abab@npm:^2.0.3":
   version: 2.0.5
   resolution: "abab@npm:2.0.5"
   checksum: a42b91bd9dd2451a3fc6996bc8953139904ff7b1a793719205041148da892337afc97ed0589ef2c44765c4da3d688eed145781db1623b611621d805294c367a3
@@ -4046,16 +4010,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"acorn-globals@npm:^4.3.2":
-  version: 4.3.4
-  resolution: "acorn-globals@npm:4.3.4"
-  dependencies:
-    acorn: ^6.0.1
-    acorn-walk: ^6.0.1
-  checksum: 6c3511f40d25daefda449b803f9d651c1b2427009d5dc74ae485efe5b704be0ce17983ac9571df3f5344a6ab1df77a29cb4e19c5f34796cec3c1c049f3ad5951
-  languageName: node
-  linkType: hard
-
 "acorn-globals@npm:^6.0.0":
   version: 6.0.0
   resolution: "acorn-globals@npm:6.0.0"
@@ -4075,13 +4029,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"acorn-walk@npm:^6.0.1":
-  version: 6.2.0
-  resolution: "acorn-walk@npm:6.2.0"
-  checksum: 3bd8415090ecfcf0a40e9bdde722993104d209d8e7721b48d9c77c46fb1dd261cc29ae0ee47e6532db9fbfe96d911b19ec0d72a383b20ed331364ab18d35b75b
-  languageName: node
-  linkType: hard
-
 "acorn-walk@npm:^7.1.1":
   version: 7.2.0
   resolution: "acorn-walk@npm:7.2.0"
@@ -4089,16 +4036,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"acorn@npm:^6.0.1":
-  version: 6.4.2
-  resolution: "acorn@npm:6.4.2"
-  bin:
-    acorn: bin/acorn
-  checksum: ec4707ffa0f41dcd9ef67e5f0938a9e8c83f2f1ffcbd3588b07126833d2ca3a6573e094c511162ad40f658a267c6533c6dd5eedead6844d50f7d8d0be080cc55
-  languageName: node
-  linkType: hard
-
-"acorn@npm:^7.1.0, acorn@npm:^7.1.1, acorn@npm:^7.4.0":
+"acorn@npm:^7.1.1, acorn@npm:^7.4.0":
   version: 7.4.1
   resolution: "acorn@npm:7.4.1"
   bin:
@@ -4507,13 +4445,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"array-equal@npm:^1.0.0":
-  version: 1.0.0
-  resolution: "array-equal@npm:1.0.0"
-  checksum: ad82ed549385a7cacb7ed3a2be9cef73ccc0ebf371e4a30635bfc5737464f7fd5c70433e25c1bbdeec3d230d41be13e46b778e5a373300655531b4b7eff1f447
-  languageName: node
-  linkType: hard
-
 "array-filter@npm:^1.0.0":
   version: 1.0.0
   resolution: "array-filter@npm:1.0.0"
@@ -4850,18 +4781,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"babel-plugin-istanbul@npm:^5.1.0":
-  version: 5.2.0
-  resolution: "babel-plugin-istanbul@npm:5.2.0"
-  dependencies:
-    "@babel/helper-plugin-utils": ^7.0.0
-    find-up: ^3.0.0
-    istanbul-lib-instrument: ^3.3.0
-    test-exclude: ^5.2.3
-  checksum: e94429f5c2fbc6b098f8ded77addabe5d229a8c4c8d449b746396c9f05e419ef41e7582aa19f8c1674c6774f9029f686653796e15de494f63ceef40d1f60e083
-  languageName: node
-  linkType: hard
-
 "babel-plugin-istanbul@npm:^6.0.0":
   version: 6.0.0
   resolution: "babel-plugin-istanbul@npm:6.0.0"
@@ -6778,7 +6697,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cssom@npm:^0.4.1, cssom@npm:^0.4.4":
+"cssom@npm:^0.4.4":
   version: 0.4.4
   resolution: "cssom@npm:0.4.4"
   checksum: db81cac44219b20d76b06f51d2614cead098478d1323b2df5e4b5d25bdc3f16d8474c3d45ae28f594a0933691c774fc2102837df66ccf375e280b0728ad53c5f
@@ -6792,7 +6711,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cssstyle@npm:^2.0.0, cssstyle@npm:^2.2.0":
+"cssstyle@npm:^2.2.0":
   version: 2.3.0
   resolution: "cssstyle@npm:2.3.0"
   dependencies:
@@ -6849,17 +6768,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"data-urls@npm:^1.1.0":
-  version: 1.1.0
-  resolution: "data-urls@npm:1.1.0"
-  dependencies:
-    abab: ^2.0.0
-    whatwg-mimetype: ^2.2.0
-    whatwg-url: ^7.0.0
-  checksum: 04d211e1e9f83bab75450487da34b124b32beacd1ad0df96e3a747b705c24c65579833a04a6ea30a528ea5b99d5247660408c513b38905bf855f2de585b9e91c
-  languageName: node
-  linkType: hard
-
 "data-urls@npm:^2.0.0":
   version: 2.0.0
   resolution: "data-urls@npm:2.0.0"
@@ -7397,15 +7305,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"domexception@npm:^1.0.1":
-  version: 1.0.1
-  resolution: "domexception@npm:1.0.1"
-  dependencies:
-    webidl-conversions: ^4.0.2
-  checksum: 0a678e600248b8a6f0149cb6a6ddae77d698d16a6fcf39d4228b933d5ac2b9ee657a36b2cd08ea82ec6196da756535bd30b8362f697cc9e564d969e52437fcd8
-  languageName: node
-  linkType: hard
-
 "domexception@npm:^2.0.1":
   version: 2.0.1
   resolution: "domexception@npm:2.0.1"
@@ -7874,7 +7773,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"escodegen@npm:^1.11.1, escodegen@npm:^1.14.1":
+"escodegen@npm:^1.14.1":
   version: 1.14.3
   resolution: "escodegen@npm:1.14.3"
   dependencies:
@@ -10188,15 +10087,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"html-encoding-sniffer@npm:^1.0.2":
-  version: 1.0.2
-  resolution: "html-encoding-sniffer@npm:1.0.2"
-  dependencies:
-    whatwg-encoding: ^1.0.1
-  checksum: fff1462d9845f08315b41a19b3deaeebf465b4abc44c12218ee2be42a4655dec18b8ca4ae2ea72270d564164a3092b9a72701c1c529777e378036a49c4f6bc80
-  languageName: node
-  linkType: hard
-
 "html-encoding-sniffer@npm:^2.0.1":
   version: 2.0.1
   resolution: "html-encoding-sniffer@npm:2.0.1"
@@ -11407,13 +11297,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"istanbul-lib-coverage@npm:^2.0.5":
-  version: 2.0.5
-  resolution: "istanbul-lib-coverage@npm:2.0.5"
-  checksum: 72737ebc48c31a45ab80fb1161b4c79a7d035d3088007ec55ec7a53b8bf6ae107a8222335e018978720270d71f2036abe73e150da4733f573be32398ad6aedd1
-  languageName: node
-  linkType: hard
-
 "istanbul-lib-coverage@npm:^3.0.0":
   version: 3.0.0
   resolution: "istanbul-lib-coverage@npm:3.0.0"
@@ -11421,21 +11304,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"istanbul-lib-instrument@npm:^3.3.0":
-  version: 3.3.0
-  resolution: "istanbul-lib-instrument@npm:3.3.0"
-  dependencies:
-    "@babel/generator": ^7.4.0
-    "@babel/parser": ^7.4.3
-    "@babel/template": ^7.4.0
-    "@babel/traverse": ^7.4.3
-    "@babel/types": ^7.4.0
-    istanbul-lib-coverage: ^2.0.5
-    semver: ^6.0.0
-  checksum: d7a7dae5db459ac4365cea3ecdaf0586c79bfb850059e2fc2364c060ca6bcbbf686675d8944d6490a52f0d018781403ec5902523430e7a404d4f2b2ad82e1aef
-  languageName: node
-  linkType: hard
-
 "istanbul-lib-instrument@npm:^4.0.0, istanbul-lib-instrument@npm:^4.0.3":
   version: 4.0.3
   resolution: "istanbul-lib-instrument@npm:4.0.3"
@@ -11633,20 +11501,6 @@ fsevents@^1.2.7:
   languageName: unknown
   linkType: soft
 
-"jest-environment-jsdom-fifteen@npm:^1.0.2":
-  version: 1.0.2
-  resolution: "jest-environment-jsdom-fifteen@npm:1.0.2"
-  dependencies:
-    "@jest/environment": ^24.3.0
-    "@jest/fake-timers": ^24.3.0
-    "@jest/types": ^24.3.0
-    jest-mock: ^24.0.0
-    jest-util: ^24.0.0
-    jsdom: ^15.2.1
-  checksum: 9951594e15af8c9ab1ef8bb2490103d115728cdd1ef423b10a2b3ee3ab8569d1c6ba5c7cf21b3424d123ef14159f2b7bcd4d32a703c8470245ea94b6137c2cc9
-  languageName: node
-  linkType: hard
-
 "jest-environment-jsdom@^26.5.2, jest-environment-jsdom@workspace:packages/jest-environment-jsdom":
   version: 0.0.0-use.local
   resolution: "jest-environment-jsdom@workspace:packages/jest-environment-jsdom"
@@ -11718,7 +11572,7 @@ fsevents@^1.2.7:
   languageName: unknown
   linkType: soft
 
-"jest-haste-map@npm:^24.7.1, jest-haste-map@npm:^24.9.0":
+"jest-haste-map@npm:^24.7.1":
   version: 24.9.0
   resolution: "jest-haste-map@npm:24.9.0"
   dependencies:
@@ -11847,7 +11701,7 @@ fsevents@^1.2.7:
   languageName: unknown
   linkType: soft
 
-"jest-mock@npm:^24.0.0, jest-mock@npm:^24.9.0":
+"jest-mock@npm:^24.9.0":
   version: 24.9.0
   resolution: "jest-mock@npm:24.9.0"
   dependencies:
@@ -11884,13 +11738,6 @@ fsevents@^1.2.7:
   languageName: unknown
   linkType: soft
 
-"jest-regex-util@npm:^24.9.0":
-  version: 24.9.0
-  resolution: "jest-regex-util@npm:24.9.0"
-  checksum: 3a30d04bcfd779397d38c6b663c0e45492bba83908c57d3498bd682aa4dd299565edb7620e38de2225c19bc06ad8febfb268101494caee39b08c1d1493050a8d
-  languageName: node
-  linkType: hard
-
 "jest-repl@workspace:packages/jest-repl":
   version: 0.0.0-use.local
   resolution: "jest-repl@workspace:packages/jest-repl"
@@ -12321,45 +12168,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"jsdom@npm:^15.2.1":
-  version: 15.2.1
-  resolution: "jsdom@npm:15.2.1"
-  dependencies:
-    abab: ^2.0.0
-    acorn: ^7.1.0
-    acorn-globals: ^4.3.2
-    array-equal: ^1.0.0
-    cssom: ^0.4.1
-    cssstyle: ^2.0.0
-    data-urls: ^1.1.0
-    domexception: ^1.0.1
-    escodegen: ^1.11.1
-    html-encoding-sniffer: ^1.0.2
-    nwsapi: ^2.2.0
-    parse5: 5.1.0
-    pn: ^1.1.0
-    request: ^2.88.0
-    request-promise-native: ^1.0.7
-    saxes: ^3.1.9
-    symbol-tree: ^3.2.2
-    tough-cookie: ^3.0.1
-    w3c-hr-time: ^1.0.1
-    w3c-xmlserializer: ^1.1.2
-    webidl-conversions: ^4.0.2
-    whatwg-encoding: ^1.0.5
-    whatwg-mimetype: ^2.3.0
-    whatwg-url: ^7.0.0
-    ws: ^7.0.0
-    xml-name-validator: ^3.0.0
-  peerDependencies:
-    canvas: ^2.5.0
-  peerDependenciesMeta:
-    canvas:
-      optional: true
-  checksum: 706d227c378e88fb13528252cc83fa18ec6d9810ee081478da3c392f9d2a543a504f23aa5d811943c9ef545cdf17850fc48db8e8aa62e5b8162f2916bc2bb008
-  languageName: node
-  linkType: hard
-
 "jsdom@npm:^16.4.0":
   version: 16.4.0
   resolution: "jsdom@npm:16.4.0"
@@ -15300,13 +15108,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"parse5@npm:5.1.0":
-  version: 5.1.0
-  resolution: "parse5@npm:5.1.0"
-  checksum: f82ab2581011704c1dd3f56fa9509904a169d06bee8d4154d40a774335ad158bc59693c6620d29093252ad120521302ff25b257bcc9aebbe12453f74659a5d65
-  languageName: node
-  linkType: hard
-
 "parse5@npm:5.1.1":
   version: 5.1.1
   resolution: "parse5@npm:5.1.1"
@@ -15581,13 +15382,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"pn@npm:^1.1.0":
-  version: 1.1.0
-  resolution: "pn@npm:1.1.0"
-  checksum: 7df19be13c86dfab22e8484590480e49d496b270430a731be0bb40cea8a16c29e45188a7303d7c57b7140754f807877b0c10aa95400ad30a7ad4fb3f7d132381
-  languageName: node
-  linkType: hard
-
 "portfinder@npm:^1.0.25":
   version: 1.0.28
   resolution: "portfinder@npm:1.0.28"
@@ -16607,16 +16401,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"read-pkg-up@npm:^4.0.0":
-  version: 4.0.0
-  resolution: "read-pkg-up@npm:4.0.0"
-  dependencies:
-    find-up: ^3.0.0
-    read-pkg: ^3.0.0
-  checksum: e611538e096723fa15f36960a293b26704145d646a3ddae6a206fa50ddba18f655b2901581ef06943758cebe8660bbf6b3b07bad645f2256cf2f775e64867ea5
-  languageName: node
-  linkType: hard
-
 "read-pkg-up@npm:^7.0.0, read-pkg-up@npm:^7.0.1":
   version: 7.0.1
   resolution: "read-pkg-up@npm:7.0.1"
@@ -16740,15 +16524,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"realpath-native@npm:^1.1.0":
-  version: 1.1.0
-  resolution: "realpath-native@npm:1.1.0"
-  dependencies:
-    util.promisify: ^1.0.0
-  checksum: 67ce6bdaf8f8dd2a85e771b7b79b74b8a47299315a0a3553947df1ab4117de80d1910a2ba856a480d9e4284172cf8d7df209117f5522475e30bb7ecdee63b75b
-  languageName: node
-  linkType: hard
-
 "rechoir@npm:^0.6.2":
   version: 0.6.2
   resolution: "rechoir@npm:0.6.2"
@@ -17022,7 +16797,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"request-promise-native@npm:^1.0.7, request-promise-native@npm:^1.0.8":
+"request-promise-native@npm:^1.0.8":
   version: 1.0.9
   resolution: "request-promise-native@npm:1.0.9"
   dependencies:
@@ -17319,7 +17094,7 @@ fsevents@^1.2.7:
     istanbul-lib-report: ^3.0.0
     istanbul-reports: ^3.0.0
     jest: "workspace:packages/jest"
-    jest-environment-jsdom-fifteen: ^1.0.2
+    jest-environment-node: ^26.5.2
     jest-junit: ^12.0.0
     jest-runner-tsd: ^1.1.0
     jest-silent-reporter: ^0.2.1
@@ -17342,7 +17117,7 @@ fsevents@^1.2.7:
     strip-ansi: ^6.0.0
     tempy: ^0.6.0
     throat: ^5.0.0
-    ts-node: ^9.0.0
+    ts-node: ">=9.0.0"
     type-fest: ^0.16.0
     typescript: ^4.0.2
     which: ^2.0.1
@@ -17495,15 +17270,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"saxes@npm:^3.1.9":
-  version: 3.1.11
-  resolution: "saxes@npm:3.1.11"
-  dependencies:
-    xmlchars: ^2.1.1
-  checksum: dbdbd14f903e2a18c3efb422401ad0630dd25e4ed6a52fd01e42b205508ee70e5170da4d39ab2957eca54dc2934b9c8fa6f2f90292b136bfa935db7877177a08
-  languageName: node
-  linkType: hard
-
 "saxes@npm:^5.0.0":
   version: 5.0.1
   resolution: "saxes@npm:5.0.1"
@@ -18634,7 +18400,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"symbol-tree@npm:^3.2.2, symbol-tree@npm:^3.2.4":
+"symbol-tree@npm:^3.2.4":
   version: 3.2.4
   resolution: "symbol-tree@npm:3.2.4"
   checksum: 0b9af4e5f005f9f0b9c916d91a1b654422ffa49ef09c5c4b6efa7a778f63976be9f410e57db1e9ea7576eea0631a34b69a5622674aa92a60a896ccf2afca87a7
@@ -18817,18 +18583,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"test-exclude@npm:^5.2.3":
-  version: 5.2.3
-  resolution: "test-exclude@npm:5.2.3"
-  dependencies:
-    glob: ^7.1.3
-    minimatch: ^3.0.4
-    read-pkg-up: ^4.0.0
-    require-main-filename: ^2.0.0
-  checksum: d441f2531cf102d267de7f4ceecb4eacc8de2a6703abbab20591d0e8b30877a0e4cdcb88f88bd292f36950feda87b25e159e2fd407c275b13cce15a2a56eefaf
-  languageName: node
-  linkType: hard
-
 "test-exclude@npm:^6.0.0":
   version: 6.0.0
   resolution: "test-exclude@npm:6.0.0"
@@ -19174,7 +18928,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"ts-node@npm:^9.0.0":
+"ts-node@npm:>=9.0.0":
   version: 9.0.0
   resolution: "ts-node@npm:9.0.0"
   dependencies:
@@ -19742,7 +19496,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"util.promisify@npm:^1.0.0, util.promisify@npm:~1.0.0":
+"util.promisify@npm:~1.0.0":
   version: 1.0.1
   resolution: "util.promisify@npm:1.0.1"
   dependencies:
@@ -19876,7 +19630,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"w3c-hr-time@npm:^1.0.1, w3c-hr-time@npm:^1.0.2":
+"w3c-hr-time@npm:^1.0.2":
   version: 1.0.2
   resolution: "w3c-hr-time@npm:1.0.2"
   dependencies:
@@ -19885,17 +19639,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"w3c-xmlserializer@npm:^1.1.2":
-  version: 1.1.2
-  resolution: "w3c-xmlserializer@npm:1.1.2"
-  dependencies:
-    domexception: ^1.0.1
-    webidl-conversions: ^4.0.2
-    xml-name-validator: ^3.0.0
-  checksum: 9a7b5c7e32d4fa3d272a38e62595ff43169a9aa1b000d27a6b2613df759071034a8e870f7e6ebae8d0024d3056eeff1cad0fdab118ad4430c3d1cac3384dcd29
-  languageName: node
-  linkType: hard
-
 "w3c-xmlserializer@npm:^2.0.0":
   version: 2.0.0
   resolution: "w3c-xmlserializer@npm:2.0.0"
@@ -19974,7 +19717,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"whatwg-encoding@npm:^1.0.1, whatwg-encoding@npm:^1.0.5":
+"whatwg-encoding@npm:^1.0.5":
   version: 1.0.5
   resolution: "whatwg-encoding@npm:1.0.5"
   dependencies:
@@ -19990,7 +19733,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"whatwg-mimetype@npm:^2.2.0, whatwg-mimetype@npm:^2.3.0":
+"whatwg-mimetype@npm:^2.3.0":
   version: 2.3.0
   resolution: "whatwg-mimetype@npm:2.3.0"
   checksum: 926e6ef8c7e53d158e501ce5e3c0e491d343c3c97e71b3d30451ffe4b1d6f81844c336b46a446a0b4f3fe4f327d76e3451d53ee8055344a0f5f2f35b84518011
@@ -20143,17 +19886,6 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"write-file-atomic@npm:2.4.1":
-  version: 2.4.1
-  resolution: "write-file-atomic@npm:2.4.1"
-  dependencies:
-    graceful-fs: ^4.1.11
-    imurmurhash: ^0.1.4
-    signal-exit: ^3.0.2
-  checksum: d5a00706d00cb4a13bca748d85d4d149b9a997201cdbedc9162810c9ac04188e191b1b06ca868df670db972ae9dbd4022a4eff2aec0c7dce73376dccb6d4efab
-  languageName: node
-  linkType: hard
-
 "write-file-atomic@npm:^1.2.0":
   version: 1.3.4
   resolution: "write-file-atomic@npm:1.3.4"
@@ -20245,7 +19977,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"ws@npm:^7, ws@npm:^7.0.0, ws@npm:^7.2.3":
+"ws@npm:^7, ws@npm:^7.2.3":
   version: 7.3.1
   resolution: "ws@npm:7.3.1"
   peerDependencies:
@@ -20323,7 +20055,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"xmlchars@npm:^2.1.1, xmlchars@npm:^2.2.0":
+"xmlchars@npm:^2.2.0":
   version: 2.2.0
   resolution: "xmlchars@npm:2.2.0"
   checksum: 69bbb61e8d939873c8aa7d006d082944de2eb6f12f55e53fdfc670d544e677736b59e498ece303f264bd1dc39b77557eef1c1c9bfb09eb5e1e30ac552420d81e

From 7d6f815ed64782822300b4707f935ff16021d63e Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 13:43:26 +0200
Subject: [PATCH 27/38] chore: ask the user if he want's to use the Typescript
 configuration and create it

---
 .../jest-cli/src/init/generate_config_file.ts | 19 +++++++++---
 packages/jest-cli/src/init/index.ts           | 29 ++++++++++++-------
 packages/jest-cli/src/init/questions.ts       |  6 ++++
 3 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/packages/jest-cli/src/init/generate_config_file.ts b/packages/jest-cli/src/init/generate_config_file.ts
index 4d7f8a428c3f..f4265a62a2e7 100644
--- a/packages/jest-cli/src/init/generate_config_file.ts
+++ b/packages/jest-cli/src/init/generate_config_file.ts
@@ -35,7 +35,13 @@ const generateConfigFile = (
   results: Record<string, unknown>,
   generateEsm = false,
 ): string => {
-  const {coverage, coverageProvider, clearMocks, environment} = results;
+  const {
+    useTypescript,
+    coverage,
+    coverageProvider,
+    clearMocks,
+    environment,
+  } = results;
 
   const overrides: Record<string, unknown> = {};
 
@@ -81,10 +87,15 @@ const generateConfigFile = (
     }
   }
 
-  return (
+  const configDocMessage =
     '// For a detailed explanation regarding each configuration property, visit:\n' +
-    '// https://jestjs.io/docs/en/configuration.html\n\n' +
-    (generateEsm ? 'export default {\n' : 'module.exports = {\n') +
+    '// https://jestjs.io/docs/en/configuration.html\n\n';
+
+  return (
+    configDocMessage +
+    (useTypescript || generateEsm
+      ? 'export default {\n'
+      : 'module.exports = {\n') +
     properties.join('\n') +
     '};\n'
   );
diff --git a/packages/jest-cli/src/init/index.ts b/packages/jest-cli/src/init/index.ts
index 82b0fceffa4b..5d0ddecf3460 100644
--- a/packages/jest-cli/src/init/index.ts
+++ b/packages/jest-cli/src/init/index.ts
@@ -11,6 +11,7 @@ import chalk = require('chalk');
 import prompts = require('prompts');
 import {constants} from 'jest-config';
 import {tryRealpath} from 'jest-util';
+import {JEST_CONFIG_EXT_TS} from 'jest-config/build/constants';
 import defaultQuestions, {testScriptQuestion} from './questions';
 import {MalformedPackageJsonError, NotFoundPackageJsonError} from './errors';
 import generateConfigFile from './generate_config_file';
@@ -26,6 +27,7 @@ const {
 } = constants;
 
 type PromptsResults = {
+  useTypescript: boolean;
   clearMocks: boolean;
   coverage: boolean;
   coverageProvider: boolean;
@@ -64,16 +66,6 @@ export default async (
   const existingJestConfigExt = JEST_CONFIG_EXT_ORDER.find(ext =>
     fs.existsSync(path.join(rootDir, getConfigFilename(ext))),
   );
-  const jestConfigPath = existingJestConfigExt
-    ? getConfigFilename(existingJestConfigExt)
-    : path.join(
-        rootDir,
-        getConfigFilename(
-          projectPackageJson.type === 'module'
-            ? JEST_CONFIG_EXT_MJS
-            : JEST_CONFIG_EXT_JS,
-        ),
-      );
 
   if (hasJestProperty || existingJestConfigExt) {
     const result: {continue: boolean} = await prompts({
@@ -122,6 +114,23 @@ export default async (
     return;
   }
 
+  // Determine if Jest should use JS or TS for the config file
+  const jestConfigFileExt = results.useTypescript
+    ? JEST_CONFIG_EXT_TS
+    : JEST_CONFIG_EXT_JS;
+
+  // Determine Jest config path
+  const jestConfigPath = existingJestConfigExt
+    ? getConfigFilename(existingJestConfigExt)
+    : path.join(
+        rootDir,
+        getConfigFilename(
+          projectPackageJson.type === 'module'
+            ? JEST_CONFIG_EXT_MJS
+            : jestConfigFileExt,
+        ),
+      );
+
   const shouldModifyScripts = results.scripts;
 
   if (shouldModifyScripts || hasJestProperty) {
diff --git a/packages/jest-cli/src/init/questions.ts b/packages/jest-cli/src/init/questions.ts
index ae8671848b64..235411dc441a 100644
--- a/packages/jest-cli/src/init/questions.ts
+++ b/packages/jest-cli/src/init/questions.ts
@@ -8,6 +8,12 @@
 import type {PromptObject} from 'prompts';
 
 const defaultQuestions: Array<PromptObject> = [
+  {
+    initial: false,
+    message: 'Would you like to use Typescript for the configuration file?',
+    name: 'useTypescript',
+    type: 'confirm',
+  },
   {
     choices: [
       {title: 'node', value: 'node'},

From 9bf4a0cda5e54c2e0d362478a30255b2f4578b26 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 14:16:02 +0200
Subject: [PATCH 28/38] chore: use the local 'jest-environment-node'

---
 package.json | 2 +-
 yarn.lock    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/package.json b/package.json
index e2f13e536238..2460d8ec4b4d 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "istanbul-lib-report": "^3.0.0",
     "istanbul-reports": "^3.0.0",
     "jest": "workspace:packages/jest",
-    "jest-environment-node": "^26.5.2",
+    "jest-environment-node": "workspace:packages/jest-environment-node",
     "jest-junit": "^12.0.0",
     "jest-runner-tsd": "^1.1.0",
     "jest-silent-reporter": "^0.2.1",
diff --git a/yarn.lock b/yarn.lock
index 2fd39aa6c257..bf0e144fff19 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -17094,7 +17094,7 @@ fsevents@^1.2.7:
     istanbul-lib-report: ^3.0.0
     istanbul-reports: ^3.0.0
     jest: "workspace:packages/jest"
-    jest-environment-node: ^26.5.2
+    jest-environment-node: "workspace:packages/jest-environment-node"
     jest-junit: ^12.0.0
     jest-runner-tsd: ^1.1.0
     jest-silent-reporter: ^0.2.1

From a69c677f60d3c395037ff87ae8ab7fd1d80d5108 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 14:17:27 +0200
Subject: [PATCH 29/38] fix: use `jest-util` instead of `jest-util/build`

---
 packages/jest-cli/src/init/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/jest-cli/src/init/index.ts b/packages/jest-cli/src/init/index.ts
index 5d0ddecf3460..90d7e7d254ca 100644
--- a/packages/jest-cli/src/init/index.ts
+++ b/packages/jest-cli/src/init/index.ts
@@ -11,7 +11,6 @@ import chalk = require('chalk');
 import prompts = require('prompts');
 import {constants} from 'jest-config';
 import {tryRealpath} from 'jest-util';
-import {JEST_CONFIG_EXT_TS} from 'jest-config/build/constants';
 import defaultQuestions, {testScriptQuestion} from './questions';
 import {MalformedPackageJsonError, NotFoundPackageJsonError} from './errors';
 import generateConfigFile from './generate_config_file';
@@ -22,6 +21,7 @@ const {
   JEST_CONFIG_BASE_NAME,
   JEST_CONFIG_EXT_MJS,
   JEST_CONFIG_EXT_JS,
+  JEST_CONFIG_EXT_TS,
   JEST_CONFIG_EXT_ORDER,
   PACKAGE_JSON,
 } = constants;

From a3b7210d6fa2eb6ec658d8f57f2e34e4f106bd1c Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 14:21:52 +0200
Subject: [PATCH 30/38] chore: add type annotation for the 'ts-node' register
 variable

---
 packages/jest-config/src/readConfigFileAndSetRootDir.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/jest-config/src/readConfigFileAndSetRootDir.ts b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
index 543ae17834bd..47f1d6823efc 100644
--- a/packages/jest-config/src/readConfigFileAndSetRootDir.ts
+++ b/packages/jest-config/src/readConfigFileAndSetRootDir.ts
@@ -10,6 +10,7 @@ import {pathToFileURL} from 'url';
 import * as fs from 'graceful-fs';
 import type {Config} from '@jest/types';
 import {interopRequireDefault} from 'jest-util';
+import type {Register} from 'ts-node';
 // @ts-expect-error: vendored
 import jsonlint from './vendor/jsonlint';
 import {
@@ -102,7 +103,7 @@ export default async function readConfigFileAndSetRootDir(
 const loadTSConfigFile = async (
   configPath: Config.Path,
 ): Promise<Config.InitialOptions> => {
-  let registerer;
+  let registerer: Register;
 
   // Register TypeScript compiler instance
   try {

From 8b678d9ee3993f76137dab197d4a8dd8c8643301 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 15:30:43 +0200
Subject: [PATCH 31/38] chore: make Typescript override module

---
 packages/jest-cli/src/init/index.ts | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/packages/jest-cli/src/init/index.ts b/packages/jest-cli/src/init/index.ts
index 90d7e7d254ca..cdc5a5298ade 100644
--- a/packages/jest-cli/src/init/index.ts
+++ b/packages/jest-cli/src/init/index.ts
@@ -117,19 +117,14 @@ export default async (
   // Determine if Jest should use JS or TS for the config file
   const jestConfigFileExt = results.useTypescript
     ? JEST_CONFIG_EXT_TS
+    : projectPackageJson.type === 'module'
+    ? JEST_CONFIG_EXT_MJS
     : JEST_CONFIG_EXT_JS;
 
   // Determine Jest config path
   const jestConfigPath = existingJestConfigExt
     ? getConfigFilename(existingJestConfigExt)
-    : path.join(
-        rootDir,
-        getConfigFilename(
-          projectPackageJson.type === 'module'
-            ? JEST_CONFIG_EXT_MJS
-            : jestConfigFileExt,
-        ),
-      );
+    : path.join(rootDir, getConfigFilename(jestConfigFileExt));
 
   const shouldModifyScripts = results.scripts;
 

From 729f6dc80d8838e91a4843131d065a3757c83530 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 16:59:01 +0200
Subject: [PATCH 32/38] chore: 'jest-environment-node' was removed from the
 root `package.json`

---
 package.json | 1 -
 yarn.lock    | 1 -
 2 files changed, 2 deletions(-)

diff --git a/package.json b/package.json
index 2460d8ec4b4d..dae436a03715 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,6 @@
     "istanbul-lib-report": "^3.0.0",
     "istanbul-reports": "^3.0.0",
     "jest": "workspace:packages/jest",
-    "jest-environment-node": "workspace:packages/jest-environment-node",
     "jest-junit": "^12.0.0",
     "jest-runner-tsd": "^1.1.0",
     "jest-silent-reporter": "^0.2.1",
diff --git a/yarn.lock b/yarn.lock
index bf0e144fff19..faa458d233a3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -17094,7 +17094,6 @@ fsevents@^1.2.7:
     istanbul-lib-report: ^3.0.0
     istanbul-reports: ^3.0.0
     jest: "workspace:packages/jest"
-    jest-environment-node: "workspace:packages/jest-environment-node"
     jest-junit: ^12.0.0
     jest-runner-tsd: ^1.1.0
     jest-silent-reporter: ^0.2.1

From 7c02d1c651e83f1c264d091cfbf53f583f530cff Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 17:44:20 +0200
Subject: [PATCH 33/38] chore: added `ts-node` as dev dependency in the
 `jest-config`

---
 package.json                      |  2 +-
 packages/jest-config/package.json |  6 ++++--
 yarn.lock                         | 12 +++++++-----
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/package.json b/package.json
index dae436a03715..899223832694 100644
--- a/package.json
+++ b/package.json
@@ -77,7 +77,7 @@
     "strip-ansi": "^6.0.0",
     "tempy": "^0.6.0",
     "throat": "^5.0.0",
-    "ts-node": ">=9.0.0",
+    "ts-node": "^9.0.0",
     "type-fest": "^0.16.0",
     "typescript": "^4.0.2",
     "which": "^2.0.1"
diff --git a/packages/jest-config/package.json b/packages/jest-config/package.json
index fc8acfb6955e..7a89d8e73b7b 100644
--- a/packages/jest-config/package.json
+++ b/packages/jest-config/package.json
@@ -10,7 +10,7 @@
   "main": "build/index.js",
   "types": "build/index.d.ts",
   "peerDependencies": {
-    "ts-node": "^9.0.0"
+    "ts-node": ">=9.0.0"
   },
   "peerDependenciesMeta": {
     "ts-node": {
@@ -35,7 +35,9 @@
     "jest-util": "^26.5.2",
     "jest-validate": "^26.5.3",
     "micromatch": "^4.0.2",
-    "pretty-format": "^26.5.2"
+    "pretty-format": "^26.5.2",
+    "ts-node": "^9.0.0",
+    "typescript": "^4.0.3"
   },
   "devDependencies": {
     "@types/babel__core": "^7.0.4",
diff --git a/yarn.lock b/yarn.lock
index faa458d233a3..e5177dc89236 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11459,8 +11459,10 @@ fsevents@^1.2.7:
     jest-validate: ^26.5.3
     micromatch: ^4.0.2
     pretty-format: ^26.5.2
-  peerDependencies:
     ts-node: ^9.0.0
+    typescript: ^4.0.3
+  peerDependencies:
+    ts-node: ">=9.0.0"
   peerDependenciesMeta:
     ts-node:
       optional: true
@@ -17116,7 +17118,7 @@ fsevents@^1.2.7:
     strip-ansi: ^6.0.0
     tempy: ^0.6.0
     throat: ^5.0.0
-    ts-node: ">=9.0.0"
+    ts-node: ^9.0.0
     type-fest: ^0.16.0
     typescript: ^4.0.2
     which: ^2.0.1
@@ -18927,7 +18929,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"ts-node@npm:>=9.0.0":
+"ts-node@npm:^9.0.0":
   version: 9.0.0
   resolution: "ts-node@npm:9.0.0"
   dependencies:
@@ -19100,7 +19102,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"typescript@*, typescript@^4.0.2":
+"typescript@*, typescript@^4.0.2, typescript@^4.0.3":
   version: 4.0.3
   resolution: "typescript@npm:4.0.3"
   bin:
@@ -19110,7 +19112,7 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@*#builtin<compat/typescript>, typescript@patch:typescript@^4.0.2#builtin<compat/typescript>":
+"typescript@patch:typescript@*#builtin<compat/typescript>, typescript@patch:typescript@^4.0.2#builtin<compat/typescript>, typescript@patch:typescript@^4.0.3#builtin<compat/typescript>":
   version: 4.0.3
   resolution: "typescript@patch:typescript@npm%3A4.0.3#builtin<compat/typescript>::version=4.0.3&hash=5bf698"
   bin:

From 9aa8d53d495d2d8f68af0920dbe07eb6c9437992 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 18:48:45 +0200
Subject: [PATCH 34/38] chores: - added comment in the generated '.ts' which
 point to the doc for more detail on type checking - fix tests to accommodate
 the new config comment - tests added to check the '.ts' file

---
 .../__tests__/__snapshots__/init.test.js.snap | 67 ++++++++++++++++++-
 .../package.json                              |  1 +
 .../jest-cli/src/init/__tests__/init.test.js  | 30 ++++++++-
 .../jest-cli/src/init/generate_config_file.ts |  8 ++-
 4 files changed, 101 insertions(+), 5 deletions(-)
 create mode 100644 packages/jest-cli/src/init/__tests__/fixtures/test_generated_jest_config_ts/package.json

diff --git a/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap b/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap
index 0e8040cfade6..e90ed19aae3e 100644
--- a/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap
+++ b/packages/jest-cli/src/init/__tests__/__snapshots__/init.test.js.snap
@@ -54,9 +54,72 @@ Object {
 }
 `;
 
+exports[`init project using jest.config.ts ask the user whether he wants to use Typescript or not user answered with "Yes" 1`] = `
+Array [
+  Object {
+    "initial": true,
+    "message": "Would you like to use Jest when running \\"test\\" script in \\"package.json\\"?",
+    "name": "scripts",
+    "type": "confirm",
+  },
+  Object {
+    "initial": false,
+    "message": "Would you like to use Typescript for the configuration file?",
+    "name": "useTypescript",
+    "type": "confirm",
+  },
+  Object {
+    "choices": Array [
+      Object {
+        "title": "node",
+        "value": "node",
+      },
+      Object {
+        "title": "jsdom (browser-like)",
+        "value": "jsdom",
+      },
+    ],
+    "initial": 0,
+    "message": "Choose the test environment that will be used for testing",
+    "name": "environment",
+    "type": "select",
+  },
+  Object {
+    "initial": false,
+    "message": "Do you want Jest to add coverage reports?",
+    "name": "coverage",
+    "type": "confirm",
+  },
+  Object {
+    "choices": Array [
+      Object {
+        "title": "v8",
+        "value": "v8",
+      },
+      Object {
+        "title": "babel",
+        "value": "babel",
+      },
+    ],
+    "initial": 0,
+    "message": "Which provider should be used to instrument code for coverage?",
+    "name": "coverageProvider",
+    "type": "select",
+  },
+  Object {
+    "initial": false,
+    "message": "Automatically clear mock calls and instances between every test?",
+    "name": "clearMocks",
+    "type": "confirm",
+  },
+]
+`;
+
 exports[`init project with package.json and no jest config all questions answered with answer: "No" should return the default configuration (an empty config) 1`] = `
-"// For a detailed explanation regarding each configuration property, visit:
-// https://jestjs.io/docs/en/configuration.html
+"/*
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/en/configuration.html
+ */
 
 module.exports = {
   // All imported modules in your tests should be mocked automatically
diff --git a/packages/jest-cli/src/init/__tests__/fixtures/test_generated_jest_config_ts/package.json b/packages/jest-cli/src/init/__tests__/fixtures/test_generated_jest_config_ts/package.json
new file mode 100644
index 000000000000..0967ef424bce
--- /dev/null
+++ b/packages/jest-cli/src/init/__tests__/fixtures/test_generated_jest_config_ts/package.json
@@ -0,0 +1 @@
+{}
diff --git a/packages/jest-cli/src/init/__tests__/init.test.js b/packages/jest-cli/src/init/__tests__/init.test.js
index e8b1b2fe1265..e3da47e6b8a9 100644
--- a/packages/jest-cli/src/init/__tests__/init.test.js
+++ b/packages/jest-cli/src/init/__tests__/init.test.js
@@ -66,7 +66,7 @@ describe('init', () => {
         expect(writtenJestConfigFilename.endsWith('.mjs')).toBe(true);
 
         expect(typeof writtenJestConfig).toBe('string');
-        expect(writtenJestConfig.split('\n')[3]).toBe('export default {');
+        expect(writtenJestConfig.split('\n')[5]).toBe('export default {');
       });
     });
 
@@ -193,6 +193,34 @@ describe('init', () => {
     },
   );
 
+  describe('project using jest.config.ts', () => {
+    describe('ask the user whether he wants to use Typescript or not', () => {
+      it('user answered with "Yes"', async () => {
+        prompts.mockReturnValueOnce({useTypescript: true});
+
+        await init(resolveFromFixture('test_generated_jest_config_ts'));
+
+        expect(prompts.mock.calls[0][0]).toMatchSnapshot();
+
+        const jestConfigFileName = fs.writeFileSync.mock.calls[0][0];
+        const writtenJestConfig = fs.writeFileSync.mock.calls[0][1];
+
+        expect(jestConfigFileName).toContain('/jest.config.ts');
+        expect(writtenJestConfig.split('\n')[5]).toBe('export default {');
+      });
+
+      it('user answered with "No"', async () => {
+        prompts.mockReturnValueOnce({useTypescript: true});
+
+        await init(resolveFromFixture('test_generated_jest_config_ts'));
+
+        const jestConfigFileName = fs.writeFileSync.mock.calls[0][0];
+
+        expect(jestConfigFileName).not.toBe('jest.config.ts');
+      });
+    });
+  });
+
   describe('has jest config in package.json', () => {
     it('should ask the user whether to override config or not', async () => {
       prompts.mockReturnValueOnce({continue: true}).mockReturnValueOnce({});
diff --git a/packages/jest-cli/src/init/generate_config_file.ts b/packages/jest-cli/src/init/generate_config_file.ts
index f4265a62a2e7..5ef32e80afb3 100644
--- a/packages/jest-cli/src/init/generate_config_file.ts
+++ b/packages/jest-cli/src/init/generate_config_file.ts
@@ -88,8 +88,12 @@ const generateConfigFile = (
   }
 
   const configDocMessage =
-    '// For a detailed explanation regarding each configuration property, visit:\n' +
-    '// https://jestjs.io/docs/en/configuration.html\n\n';
+    '/*\n' +
+    ' * For a detailed explanation regarding each configuration property' +
+    (useTypescript ? ' and type check' : '') +
+    ', visit:\n' +
+    ' * https://jestjs.io/docs/en/configuration.html\n' +
+    ' */\n\n';
 
   return (
     configDocMessage +

From 55169aa0855fd91df06ac87f8d331ac101458779 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 21:14:34 +0200
Subject: [PATCH 35/38] chore: move `typescript` and `ts-node` from
 'dependencies' to 'devDependencies'

---
 packages/jest-config/package.json | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/packages/jest-config/package.json b/packages/jest-config/package.json
index 7a89d8e73b7b..549658f47ce6 100644
--- a/packages/jest-config/package.json
+++ b/packages/jest-config/package.json
@@ -35,15 +35,15 @@
     "jest-util": "^26.5.2",
     "jest-validate": "^26.5.3",
     "micromatch": "^4.0.2",
-    "pretty-format": "^26.5.2",
-    "ts-node": "^9.0.0",
-    "typescript": "^4.0.3"
+    "pretty-format": "^26.5.2"
   },
   "devDependencies": {
     "@types/babel__core": "^7.0.4",
     "@types/glob": "^7.1.1",
     "@types/graceful-fs": "^4.1.3",
-    "@types/micromatch": "^4.0.0"
+    "@types/micromatch": "^4.0.0",
+    "ts-node": "^9.0.0",
+    "typescript": "^4.0.3"
   },
   "engines": {
     "node": ">= 10.14.2"

From b6149953ea8bdaf36e5ebe7417cfd191d0e8b1ca Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 21:15:25 +0200
Subject: [PATCH 36/38] fix: jest.config.ts test > user answered with "No"

---
 packages/jest-cli/src/init/__tests__/init.test.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/jest-cli/src/init/__tests__/init.test.js b/packages/jest-cli/src/init/__tests__/init.test.js
index e3da47e6b8a9..d8d820393c51 100644
--- a/packages/jest-cli/src/init/__tests__/init.test.js
+++ b/packages/jest-cli/src/init/__tests__/init.test.js
@@ -210,13 +210,13 @@ describe('init', () => {
       });
 
       it('user answered with "No"', async () => {
-        prompts.mockReturnValueOnce({useTypescript: true});
+        prompts.mockReturnValueOnce({useTypescript: false});
 
         await init(resolveFromFixture('test_generated_jest_config_ts'));
 
         const jestConfigFileName = fs.writeFileSync.mock.calls[0][0];
 
-        expect(jestConfigFileName).not.toBe('jest.config.ts');
+        expect(jestConfigFileName).not.toContain('jest.config.ts');
       });
     });
   });

From 3fb9994b643a8ca89229ebe39f6e9ae56681676b Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 21:20:58 +0200
Subject: [PATCH 37/38] chore: use multiline string instead of manual newlines

---
 .../jest-cli/src/init/generate_config_file.ts     | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/packages/jest-cli/src/init/generate_config_file.ts b/packages/jest-cli/src/init/generate_config_file.ts
index 5ef32e80afb3..78c6134c89cc 100644
--- a/packages/jest-cli/src/init/generate_config_file.ts
+++ b/packages/jest-cli/src/init/generate_config_file.ts
@@ -87,13 +87,14 @@ const generateConfigFile = (
     }
   }
 
-  const configDocMessage =
-    '/*\n' +
-    ' * For a detailed explanation regarding each configuration property' +
-    (useTypescript ? ' and type check' : '') +
-    ', visit:\n' +
-    ' * https://jestjs.io/docs/en/configuration.html\n' +
-    ' */\n\n';
+  const configDocMessage = `/*
+ * For a detailed explanation regarding each configuration property${
+   useTypescript ? ' and type check' : ''
+ }, visit:
+ * https://jestjs.io/docs/en/configuration.html
+ */
+
+`;
 
   return (
     configDocMessage +

From 6336d3601fc37c8cc828a7d593f17aa937c385f6 Mon Sep 17 00:00:00 2001
From: Gamote <contact@gamote.ro>
Date: Mon, 12 Oct 2020 22:07:48 +0200
Subject: [PATCH 38/38] chore: better naming for the 'configDocMessage':
 'configHeaderMessage'

---
 packages/jest-cli/src/init/generate_config_file.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/jest-cli/src/init/generate_config_file.ts b/packages/jest-cli/src/init/generate_config_file.ts
index 78c6134c89cc..a7fdff6e277a 100644
--- a/packages/jest-cli/src/init/generate_config_file.ts
+++ b/packages/jest-cli/src/init/generate_config_file.ts
@@ -87,7 +87,7 @@ const generateConfigFile = (
     }
   }
 
-  const configDocMessage = `/*
+  const configHeaderMessage = `/*
  * For a detailed explanation regarding each configuration property${
    useTypescript ? ' and type check' : ''
  }, visit:
@@ -97,7 +97,7 @@ const generateConfigFile = (
 `;
 
   return (
-    configDocMessage +
+    configHeaderMessage +
     (useTypescript || generateEsm
       ? 'export default {\n'
       : 'module.exports = {\n') +