convert all exports to ESM

CHANGELOG.md

@@ -105,6 +105,7 @@
 ### Chore & Maintenance
 
 - `[*]` [**BREAKING**] Require Node.js 6+ for all packages ([#7258](https://github.com/facebook/jest/pull/7258))
+- `[*]` [**BREAKING**] Use ESM `import` and `export` all over ([#7548](https://github.com/facebook/jest/pull/7548))
 - `[jest-util]` [**BREAKING**] Remove long-deprecated globals for fake timers ([#7285](https://github.com/facebook/jest/pull/7285))
 - `[docs]` Fix message property in custom matcher example to return a function instead of a constant. ([#7426](https://github.com/facebook/jest/pull/7426))
 - `[jest-circus]` Standardize file naming in `jest-circus` ([#7301](https://github.com/facebook/jest/pull/7301))

e2e/__tests__/__snapshots__/module_name_mapper.test.js.snap

@@ -32,7 +32,7 @@ exports[`moduleNameMapper wrong configuration 1`] = `
  12 | module.exports = () => 'test';
  13 | 
 
- at packages/jest-resolve/build/index.js:433:17
+ at packages/jest-resolve/build/index.js:452:17
  at index.js:10:1
 
 "

e2e/__tests__/__snapshots__/resolve_no_file_extensions.test.js.snap

@@ -33,7 +33,7 @@ exports[`show error message with matching files 1`] = `
  | ^
  4 | 
 
- at packages/jest-resolve/build/index.js:200:17
+ at packages/jest-resolve/build/index.js:217:17
  at index.js:3:18
 
 "

e2e/runJest.js

@@ -12,7 +12,7 @@ import path from 'path';
 import fs from 'fs';
 import execa, {sync as spawnSync} from 'execa';
 import {Writable} from 'readable-stream';
-const stripAnsi = require('strip-ansi');
+import stripAnsi from 'strip-ansi';
 import {normalizeIcons} from './Utils';
 
 const JEST_PATH = path.resolve(__dirname, '../packages/jest-cli/bin/jest.js');

e2e/test-environment-async/TestEnvironment.js

@@ -5,7 +5,7 @@
 const fs = require('fs');
 const os = require('os');
 const mkdirp = require('mkdirp');
-const JSDOMEnvironment = require('jest-environment-jsdom');
+const JSDOMEnvironment = require('jest-environment-jsdom').default;
 
 const DIR = os.tmpdir() + '/jest-test-environment';
 

packages/babel-jest/src/__tests__/index.js

@@ -4,7 +4,8 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
-const babelJest = require('../index');
+
+import babelJest from '../index';
 
 //Mock data for all the tests
 const sourceString = `

packages/babel-jest/src/index.js

@@ -24,7 +24,7 @@ import babelIstanbulPlugin from 'babel-plugin-istanbul';
 const THIS_FILE = fs.readFileSync(__filename);
 const jestPresetPath = require.resolve('babel-preset-jest');
 
-const createTransformer = (options: any): Transformer => {
+export const createTransformer = (options: any): Transformer => {
  options = Object.assign({}, options, {
  compact: false,
  plugins: (options && options.plugins) || [],
@@ -110,5 +110,4 @@ const createTransformer = (options: any): Transformer => {
  };
 };
 
-module.exports = createTransformer();
-(module.exports: any).createTransformer = createTransformer;
+export default createTransformer();

packages/babel-plugin-jest-hoist/src/index.js

@@ -139,7 +139,7 @@ FUNCTIONS.deepUnmock = args => args.length === 1 && args[0].isStringLiteral();
 FUNCTIONS.disableAutomock = FUNCTIONS.enableAutomock = args =>
  args.length === 0;
 
-module.exports = () => {
+export default () => {
  const isJest = callee =>
  callee.get('object').isIdentifier(JEST_GLOBAL) ||
  (callee.isMemberExpression() && isJest(callee.get('object')));

packages/expect/src/__tests__/assertionCounts.test.js

@@ -8,7 +8,7 @@
 
 'use strict';
 
-const jestExpect = require('../');
+import jestExpect from '../';
 
 describe('.assertions()', () => {
  it('does not throw', () => {

packages/expect/src/__tests__/asymmetricMatchers.test.js

@@ -8,19 +8,19 @@
 
 'use strict';
 
-const jestExpect = require('../');
-const {
+import jestExpect from '../';
+import {
  any,
  anything,
  arrayContaining,
  arrayNotContaining,
  objectContaining,
  objectNotContaining,
  stringContaining,
- stringNotContaining,
  stringMatching,
+ stringNotContaining,
  stringNotMatching,
-} = require('../asymmetricMatchers');
+} from '../asymmetricMatchers';
 
 test('Any.asymmetricMatch()', () => {
  const Thing = function() {};

packages/expect/src/__tests__/extend.test.js

@@ -6,10 +6,10 @@
  *
  */
 
-const matcherUtils = require('jest-matcher-utils');
-const {iterableEquality, subsetEquality} = require('../utils');
-const {equals} = require('../jasmineUtils');
-const jestExpect = require('../');
+import * as matcherUtils from 'jest-matcher-utils';
+import {iterableEquality, subsetEquality} from '../utils';
+import {equals} from '../jasmineUtils';
+import jestExpect from '../';
 
 jestExpect.extend({
  toBeDivisibleBy(actual, expected) {

packages/expect/src/__tests__/matchers.test.js

@@ -6,10 +6,11 @@
  *
  */
 
-const {stringify} = require('jest-matcher-utils');
-const jestExpect = require('../');
-const Immutable = require('immutable');
-const chalk = require('chalk');
+import {stringify} from 'jest-matcher-utils';
+import jestExpect from '../';
+import Immutable from 'immutable';
+import chalk from 'chalk';
+
 const chalkEnabled = chalk.enabled;
 
 beforeAll(() => {

packages/expect/src/__tests__/spyMatchers.test.js

@@ -6,8 +6,8 @@
  *
  */
 
-const Immutable = require('immutable');
-const jestExpect = require('../');
+import Immutable from 'immutable';
+import jestExpect from '../';
 
 ['toBeCalled', 'toHaveBeenCalled'].forEach(called => {
  describe(`${called}`, () => {

packages/expect/src/__tests__/stacktrace.test.js

@@ -6,7 +6,7 @@
  *
  */
 
-const jestExpect = require('../');
+import jestExpect from '../';
 
 jestExpect.extend({
  toCustomMatch(callback, expectation) {

packages/expect/src/__tests__/toThrowMatchers.test.js

@@ -8,7 +8,7 @@
 
 'use strict';
 
-const jestExpect = require('../');
+import jestExpect from '../';
 
 // Custom Error class because node versions have different stack trace strings.
 class customError extends Error {

packages/expect/src/__tests__/utils.test.js

@@ -8,14 +8,14 @@
 
 'use strict';
 
-const {stringify} = require('jest-matcher-utils');
-const {
+import {stringify} from 'jest-matcher-utils';
+import {
  emptyObject,
  getObjectSubset,
  getPath,
  hasOwnProperty,
  subsetEquality,
-} = require('../utils');
+} from '../utils';
 
 describe('getPath()', () => {
  test('property exists', () => {

packages/expect/src/index.js

@@ -77,7 +77,7 @@ const getPromiseMatcher = (name, matcher) => {
  return null;
 };
 
-const expect = (actual: any, ...rest): ExpectationObject => {
+const expect = (actual: any, ...rest: Array<any>): ExpectationObject => {
  if (rest.length !== 0) {
  throw new Error('Expect takes at most one argument.');
  }
@@ -361,7 +361,7 @@ function assertions(expected: number) {
  getState().expectedAssertionsNumber = expected;
  getState().expectedAssertionsNumberError = error;
 }
-function hasAssertions(...args) {
+function hasAssertions(...args: Array<any>) {
  const error = new Error();
  if (Error.captureStackTrace) {
  Error.captureStackTrace(error, hasAssertions);
@@ -384,4 +384,4 @@ expect.getState = getState;
 expect.setState = setState;
 expect.extractExpectedAssertionsErrors = extractExpectedAssertionsErrors;
 
-module.exports = (expect: Expect);
+export default (expect: Expect);

packages/jest-circus/src/__tests__/circusItTestError.test.js

@@ -9,19 +9,9 @@
 
 'use strict';
 
-let circusIt;
-let circusTest;
-
 // using jest-jasmine2's 'it' to test jest-circus's 'it'. Had to differentiate
 // the two with this alias.
-
-const aliasCircusIt = () => {
- const {it, test} = require('../index.js');
- circusIt = it;
- circusTest = test;
-};
-
-aliasCircusIt();
+import {it as circusIt, test as circusTest} from '../index.js';
 
 // A few of these tests require incorrect types to throw errors and thus pass
 // the test. The typechecks on jest-circus would prevent that, so

packages/jest-circus/src/__tests__/circusItTodoTestError.test.js

@@ -9,17 +9,9 @@
 
 'use strict';
 
-let circusIt;
-
 // using jest-jasmine2's 'it' to test jest-circus's 'it'. Had to differentiate
 // the two with this alias.
-
-const aliasCircusIt = () => {
- const {it} = require('../index.js');
- circusIt = it;
-};
-
-aliasCircusIt();
+import {it as circusIt} from '../index.js';
 
 describe('test/it.todo error throwing', () => {
  it('todo throws error when given no arguments', () => {

packages/jest-circus/src/__tests__/hooksError.test.js

@@ -9,7 +9,7 @@
 
 'use strict';
 
-const circus = require('../index.js');
+import * as circus from '../index.js';
 
 describe.each([['beforeEach'], ['beforeAll'], ['afterEach'], ['afterAll']])(
  '%s hooks error throwing',
@@ -27,6 +27,7 @@ describe.each([['beforeEach'], ['beforeAll'], ['afterEach'], ['afterAll']])(
  `${fn} throws an error when %p is provided as a first argument to it`,
  el => {
  expect(() => {
+ // eslint-disable-next-line import/namespace
  circus[fn](el);
  }).toThrowError(
  'Invalid first argument. It must be a callback function.',

packages/jest-circus/src/index.js

@@ -23,7 +23,7 @@ import {dispatch} from './state';
 
 type THook = (fn: HookFn, timeout?: number) => void;
 
-const describe = (blockName: BlockName, blockFn: BlockFn) =>
+export const describe = (blockName: BlockName, blockFn: BlockFn) =>
  _dispatchDescribe(blockFn, blockName, describe);
 describe.only = (blockName: BlockName, blockFn: BlockFn) =>
  _dispatchDescribe(blockFn, blockName, describe.only, 'only');
@@ -69,18 +69,18 @@ const _addHook = (fn: HookFn, hookType: HookType, hookFn, timeout: ?number) => {
 };
 
 // Hooks have to pass themselves to the HOF in order for us to trim stack traces.
-const beforeEach: THook = (fn, timeout) =>
+export const beforeEach: THook = (fn, timeout) =>
  _addHook(fn, 'beforeEach', beforeEach, timeout);
-const beforeAll: THook = (fn, timeout) =>
+export const beforeAll: THook = (fn, timeout) =>
  _addHook(fn, 'beforeAll', beforeAll, timeout);
-const afterEach: THook = (fn, timeout) =>
+export const afterEach: THook = (fn, timeout) =>
  _addHook(fn, 'afterEach', afterEach, timeout);
-const afterAll: THook = (fn, timeout) =>
+export const afterAll: THook = (fn, timeout) =>
  _addHook(fn, 'afterAll', afterAll, timeout);
 
-const test = (testName: TestName, fn: TestFn, timeout?: number) =>
+export const test = (testName: TestName, fn: TestFn, timeout?: number) =>
  _addTest(testName, undefined, fn, test, timeout);
-const it = test;
+export const it = test;
 test.skip = (testName: TestName, fn?: TestFn, timeout?: number) =>
  _addTest(testName, 'skip', fn, test.skip, timeout);
 test.only = (testName: TestName, fn: TestFn, timeout?: number) =>
@@ -138,13 +138,3 @@ test.skip.each = bindEach(test.skip);
 describe.each = bindEach(describe, false);
 describe.only.each = bindEach(describe.only, false);
 describe.skip.each = bindEach(describe.skip, false);
-
-module.exports = {
- afterAll,
- afterEach,
- beforeAll,
- beforeEach,
- describe,
- it,
- test,
-};

packages/jest-circus/src/legacy-code-todo-rewrite/jestAdapter.js

@@ -15,13 +15,13 @@ import type Runtime from 'jest-runtime';
 const FRAMEWORK_INITIALIZER = require.resolve('./jestAdapterInit');
 import path from 'path';
 
-const jestAdapter = async (
+export default async function jestAdapter(
  globalConfig: GlobalConfig,
  config: ProjectConfig,
  environment: Environment,
  runtime: Runtime,
  testPath: string,
-): Promise<TestResult> => {
+): Promise<TestResult> {
  const {
  initialize,
  runAndTransformResultsToJestFormat,
@@ -82,7 +82,7 @@ const jestAdapter = async (
  testPath,
  });
  return _addSnapshotData(results, snapshotState);
-};
+}
 
 const _addSnapshotData = (results: TestResult, snapshotState) => {
  results.testResults.forEach(({fullName, status}) => {
@@ -110,5 +110,3 @@ const _addSnapshotData = (results: TestResult, snapshotState) => {
  results.snapshot.uncheckedKeys = Array.from(uncheckedKeys);
  return results;
 };
-
-module.exports = jestAdapter;