Revert ESM exports

CHANGELOG.md

@@ -114,7 +114,6 @@
 ### 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__/moduleNameMapper.test.js.snap

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

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

@@ -33,7 +33,7 @@ exports[`show error message with matching files 1`] = `
         |                  ^
       4 | 
 
-      at Resolver.resolveModule (../../packages/jest-resolve/build/index.js:217:17)
+      at Resolver.resolveModule (../../packages/jest-resolve/build/index.js:200:17)
       at Object.require (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';
-import stripAnsi from 'strip-ansi';
+const stripAnsi = require('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').default;
+const JSDOMEnvironment = require('jest-environment-jsdom');
 
 const DIR = os.tmpdir() + '/jest-test-environment';
 

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

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

packages/babel-jest/src/index.js

@@ -25,7 +25,7 @@ const jestPresetPath = require.resolve('babel-preset-jest');
 const babelIstanbulPlugin = require.resolve('babel-plugin-istanbul');
 const cwd = process.cwd();
 
-export const createTransformer = (options: any): Transformer => {
+const createTransformer = (options: any): Transformer => {
   // Allow incoming options to override `cwd`
   options = Object.assign({cwd}, options, {
     caller: {
@@ -108,4 +108,5 @@ export const createTransformer = (options: any): Transformer => {
   };
 };
 
-export default createTransformer();
+module.exports = createTransformer();
+(module.exports: any).createTransformer = 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;
 
-export default () => {
+module.exports = () => {
   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';
 
-import jestExpect from '../';
+const jestExpect = require('../');
 
 describe('.assertions()', () => {
   it('does not throw', () => {

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

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

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

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

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

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

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

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

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

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

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

@@ -8,7 +8,7 @@
 
 'use strict';
 
-import jestExpect from '../';
+const jestExpect = require('../');
 
 // 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';
 
-import {stringify} from 'jest-matcher-utils';
-import {
+const {stringify} = require('jest-matcher-utils');
+const {
   emptyObject,
   getObjectSubset,
   getPath,
   hasOwnProperty,
   subsetEquality,
-} from '../utils';
+} = require('../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: Array<any>): ExpectationObject => {
+const expect = (actual: any, ...rest): 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: Array<any>) {
+function hasAssertions(...args) {
   const error = new Error();
   if (Error.captureStackTrace) {
     Error.captureStackTrace(error, hasAssertions);
@@ -384,4 +384,4 @@ expect.getState = getState;
 expect.setState = setState;
 expect.extractExpectedAssertionsErrors = extractExpectedAssertionsErrors;
 
-export default (expect: Expect);
+module.exports = (expect: Expect);

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

@@ -9,9 +9,19 @@
 
 '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.
-import {it as circusIt, test as circusTest} from '../index.js';
+
+const aliasCircusIt = () => {
+  const {it, test} = require('../index.js');
+  circusIt = it;
+  circusTest = test;
+};
+
+aliasCircusIt();
 
 // 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

@@ -9,9 +9,17 @@
 
 'use strict';
 
+let circusIt;
+
 // using jest-jasmine2's 'it' to test jest-circus's 'it'. Had to differentiate
 // the two with this alias.
-import {it as circusIt} from '../index.js';
+
+const aliasCircusIt = () => {
+  const {it} = require('../index.js');
+  circusIt = it;
+};
+
+aliasCircusIt();
 
 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';
 
-import * as circus from '../index.js';
+const circus = require('../index.js');
 
 describe.each([['beforeEach'], ['beforeAll'], ['afterEach'], ['afterAll']])(
   '%s hooks error throwing',
@@ -27,7 +27,6 @@ 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;
 
-export const describe = (blockName: BlockName, blockFn: BlockFn) =>
+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.
-export const beforeEach: THook = (fn, timeout) =>
+const beforeEach: THook = (fn, timeout) =>
   _addHook(fn, 'beforeEach', beforeEach, timeout);
-export const beforeAll: THook = (fn, timeout) =>
+const beforeAll: THook = (fn, timeout) =>
   _addHook(fn, 'beforeAll', beforeAll, timeout);
-export const afterEach: THook = (fn, timeout) =>
+const afterEach: THook = (fn, timeout) =>
   _addHook(fn, 'afterEach', afterEach, timeout);
-export const afterAll: THook = (fn, timeout) =>
+const afterAll: THook = (fn, timeout) =>
   _addHook(fn, 'afterAll', afterAll, timeout);
 
-export const test = (testName: TestName, fn: TestFn, timeout?: number) =>
+const test = (testName: TestName, fn: TestFn, timeout?: number) =>
   _addTest(testName, undefined, fn, test, timeout);
-export const it = test;
+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) =>
@@ -138,3 +138,13 @@ 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';
 
-export default async function jestAdapter(
+const jestAdapter = async (
   globalConfig: GlobalConfig,
   config: ProjectConfig,
   environment: Environment,
   runtime: Runtime,
   testPath: string,
-): Promise<TestResult> {
+): Promise<TestResult> => {
   const {
     initialize,
     runAndTransformResultsToJestFormat,
@@ -82,7 +82,7 @@ export default async function jestAdapter(
     testPath,
   });
   return _addSnapshotData(results, snapshotState);
-}
+};
 
 const _addSnapshotData = (results: TestResult, snapshotState) => {
   results.testResults.forEach(({fullName, status}) => {
@@ -110,3 +110,5 @@ const _addSnapshotData = (results: TestResult, snapshotState) => {
   results.snapshot.uncheckedKeys = Array.from(uncheckedKeys);
   return results;
 };
+
+module.exports = jestAdapter;