24.9.0

Features

• [expect] Highlight substring differences when matcher fails, part 1 (#8448)
• [expect] Highlight substring differences when matcher fails, part 2 (#8528)
• [expect] Improve report when mock-spy matcher fails, part 1 (#8640)
• [expect] Improve report when mock-spy matcher fails, part 2 (#8649)
• [expect] Improve report when mock-spy matcher fails, part 3 (#8697)
• [expect] Improve report when mock-spy matcher fails, part 4 (#8710)
• [expect] Throw matcher error when received cannot be jasmine spy (#8747)
• [expect] Improve report when negative CalledWith assertion fails (#8755)
• [expect] Improve report when positive CalledWith assertion fails (#8771)
• [expect] Display equal values for ReturnedWith similar to CalledWith (#8791)
• [expect, jest-snapshot] Change color from green for some args in matcher hints (#8812)
• [jest-snapshot] Highlight substring differences when matcher fails, part 3 (#8569)
• [jest-core] Improve report when snapshots are obsolete (#8665)
• [jest-cli] Improve chai support (with detailed output, to match jest exceptions) (#8454)
• [*] Manage the global timeout with --testTimeout command line argument. (#8456)
• [pretty-format] Render custom displayName of memoized components (#8546)
• [jest-validate] Allow maxWorkers as part of the jest.config.js (#8565)
• [jest-runtime] Allow passing configuration objects to transformers (#7288)
• [@jest/core, @jest/test-sequencer] Support async sort in custom testSequencer (#8642)
• [jest-runtime, @jest/fake-timers] Add jest.advanceTimersToNextTimer (#8713)
• [@jest-transform] Extract transforming require logic within jest-core into @jest-transform (#8756)
• [jest-matcher-utils] Add color options to matcherHint (#8795)
• [jest-circus/jest-jasmine2] Give clearer output for Node assert errors (#8792)
• [jest-runner] Export all types in the type signature of jest-runner (#8825)

Fixes

• [jest-cli] Detect side-effect only imports when running --onlyChanged or --changedSince (#8670)
• [jest-cli] Allow --maxWorkers to work with % input again (#8565)
• [babel-plugin-jest-hoist] Expand list of whitelisted globals in global mocks (#8429)
• [jest-core] Make watch plugin initialization errors look nice (#8422)
• [jest-snapshot] Prevent inline snapshots from drifting when inline snapshots are updated (#8492)
• [jest-haste-map] Don't throw on missing mapper in Node crawler (#8558)
• [jest-core] Fix incorrect passWithNoTests warning (#8595)
• [jest-snapshots] Fix test retries that contain snapshots (#8629)
• [jest-mock] Fix incorrect assignments when restoring mocks in instances where they originally didn't exist (#8631)
• [expect] Fix stack overflow when matching objects with circular references (#8687)
• [jest-haste-map] Workaround a node >=12.5.0 bug that causes the process not to exit after tests have completed and cancerous memory growth (#8787)

Chore & Maintenance

• [docs] Replace FlowType with TypeScript in CONTRIBUTING.MD code conventions
• [jest-leak-detector] remove code repeat (#8438)
• [docs] Add example to jest.requireActual (#8482)
• [docs] Add example to jest.mock for mocking ES6 modules with the factory parameter (#8550)
• [docs] Add information about using jest.doMock with ES6 imports (#8573)
• [docs] Fix variable name in custom-matcher-api code example (#8582)
• [docs] Fix example used in custom environment docs (#8617)
• [docs] Updated react tutorial to refer to new package of react-testing-library (@testing-library/react) (#8753)
• [docs] Updated imports of react-testing-library to @testing-library/react in website (#8757)
• [jest-core] Add getVersion (moved from jest-cli) (#8706)
• [docs] Fix MockFunctions example that was using toContain instead of toContainEqual (#8765)
• [*] Make sure copyright header comment includes license (#8783)
• [*] Check copyright and license as one joined substring (#8815)
• [docs] Fix WatchPlugins jestHooks.shouldRunTestSuite example that receives an object (#8784)
• [*] Enforce LF line endings (#8809)
• [pretty-format] Delete obsolete link and simplify structure in README (#8824)
• [docs] Fix broken transform link on webpack page (#9155)

Performance

• [jest-watcher] Minor optimization for JestHook (#8746)
• [@jest/reporters] Prevent runaway CPU usage with --notify on macOS (#8831)

24.6.0

Features

• [expect]: Improve report when matcher fails, part 13 (#8077)
• [@jest/core] Filter API pre-filter setup hook (#8142)
• [jest-snapshot] Improve report when matcher fails, part 14 (#8132)
• [@jest/reporter] Display todo and skip test descriptions when verbose is true (#8038)
• [jest-runner] Support default exports for test environments (#8163)
• [pretty-format] Support React.Suspense (#8180)
• [jest-snapshot] Indent inline snapshots (#8198)
• [jest-config] Support colors in displayName configuration (#8025)

Fixes

• [jest-circus] Fix test retries with beforeAll/beforeEach failures (#8227)
• [expect] Fix circular references in iterable equality (#8160)
• [jest-changed-files] Change method of obtaining git root (#8052)
• [jest-each] Fix test function type (#8145)
• [jest-fake-timers] getTimerCount not taking immediates and ticks into account (#8139)
• [jest-runtime] Allow json file as manual mock (#8159)
• [pretty-format] Print BigInt as a readable number instead of {} (#8138)
• [jest-core] Fix ability to transform dependencies required from globalSetup script (#8143)
• [@jest/reporters] Fix Cannot read property converageData of null (#8168)
• [jest-worker] JEST_WORKER_ID starts at 1 (#8205)
• [jest-config] Use default cwd even if config contains a cwd property (#7923)
• [jest-resolve-dependencies]: Remove internal peer dependencies (#8215)
• [jest-resolve]: Remove internal peer dependencies (#8215)
• [jest-snapshot]: Remove internal peer dependencies (#8215)
• [jest-resolve] Fix requireActual with moduleNameMapper (#8210)
• [jest-haste-map] Fix haste map duplicate detection in watch mode (#8237)

Chore & Maintenance

• [*] Remove flow from code base (#8061)
• [*] Use property initializer syntax in Jest codebase (#8117)
• [*] Move @types/node to the root package.json (#8129)
• [*] Add documentation and tests related to auto-mocking (#8099)
• [*] Add jest-watch-typeahead as a devDependency (#6449)
• [*] upgrade TS to 3.4.0-dev* for incremental builds (#8149)
• [docs] Improve description of optional arguments in ExpectAPI.md (#8126)

Performance

• [jest-haste-map] Optimize haste map data structure for serialization/deserialization (#8171)
• [jest-haste-map] Avoid persisting haste map or processing files when not changed (#8153)
• [jest-core] Improve performance of SearchSource.findMatchingTests by 15% (#8184)
• [jest-resolve] Optimize internal cache lookup performance (#8183)
• [jest-core] Dramatically improve watch mode performance (#8201)
• [jest-transform] Cache regular expression instead of creating anew for every file in ScriptTransformer (#8235)
• [jest-core] Fix memory leak of source map info and minor performance improvements (#8234)
• [jest-console] Fix memory leak by releasing console output reference when printed to stdout (#8233)
• [jest-runtime] Use Map instead of Object for module registry (#8232)

24.3.0

We skipped 24.2.0 because a draft was accidentally published. Please use 24.3.0 or a newer version instead.

Features

• [expect]: Improve report when matcher fails, part 10 (#7960)
• [expect]: Improve report when matcher fails, part 11 (#8008)
• [expect]: Improve report when matcher fails, part 12 (#8033)
• [expect]: Improve report when matcher fails, part 7 (#7866)
• [expect]: Improve report when matcher fails, part 8 (#7876)
• [expect]: Improve report when matcher fails, part 9 (#7940)
• [jest-circus/jest-jasmine2] Warn if describe returns a value (#7852)
• [jest-config] Print error information on preset normalization error (#7935)
• [jest-get-type] Add isPrimitive function (#7708)
• [jest-haste-map] Add skipPackageJson option (#7778)
• [jest-util] Add isPromise (#7852)
• [pretty-format] Support React.memo (#7891)

Fixes

• [expect] Fix toStrictEqual not considering arrays with objects having undefined values correctly (#7938)
• [expect] Fix custom async matcher stack trace (#7652)
• [expect] Fix non-object received value in toHaveProperty (#7986, #8067)
• [expect] Fix non-symmetric equal for Number (#7948)
• [expect] Remove duck typing and obsolete browser support code when comparing DOM nodes and use DOM-Level-3 API instead (#7995)
• [jest-changed-files] Fix getChangedFilesFromRoots to not return parts of the commit messages as if they were files, when the commit messages contained multiple paragraphs (#7961)
• [jest-changed-files] Fix pattern for HG changed files (#8066)
• [jest-changed-files] Improve default file selection for Mercurial repos (#7880)
• [jest-circus] Fix bug with test.only (#7888)
• [jest-circus]: Throw explicit error when errors happen after test is considered complete (#8005)
• [jest-cli] Fix prototype pollution vulnerability in dependency (#7904)
• [jest-cli] Refactor -o and --coverage combined (#7611)
• [jest-environment-node] Add missing globals: TextEncoder and TextDecoder (#8022)
• [jest-haste-map] Enforce uniqueness in names (mocks and haste ids) (#8002)
• [jest-jasmine2]: Throw explicit error when errors happen after test is considered complete (#8005)
• [jest-mock] Adds a type check to prototype to allow mocks of objects with a primitive prototype property. (#8040)
• [jest-transform] Normalize config and remove unnecessary checks, convert TestUtils.js to TypeScript (#7801)
• [jest-util]Make sure to not fail if unable to assign toStringTag to the process object, which is read only in Node 12 (#8050)
• [jest-validate] Fix validating async functions (#7894)
• [jest-worker] Fix jest-worker when using pre-allocated jobs (#7934)
• [static] Remove console log '-' on the front page (#7977)

Chore & Maintenance

• [*]: Setup building, linting and testing of TypeScript (#7808, #7855, #7951)
• [@jest/console]: Extract custom console implementations from jest-util into a new separate package (#8030)
• [@jest/core] Create new package, which is jest-cli minus yargs and prompts (#7696)
• [@jest/core]: Migrate to TypeScript (#7998)
• [@jest/fake-timers]: Extract FakeTimers class from jest-util into a new separate package (#7987)
• [@jest/reporter]: New package extracted from jest-cli (#7902)
• [@jest/reporters]: Migrate to TypeScript (#7994, #8045)
• [@jest/source-map]: Extract getCallsite function from jest-util into a new separate package (#8029)
• [@jest/test-result]: Extract TestResult types and helpers into a new separate package (#8034)
• [@jest/transform]: Migrate to TypeScript (#7918, #7945)
• [@jest/transform]: New package extracted from jest-runtime (#7915)
• [@jest/types]: New package to handle shared types (#7834)
• [babel-jest]: Migrate to TypeScript (#7862)
• [babel-plugin-jest-hoist]: Migrate to TypeScript (#7898)
• [diff-sequences]: Migrate to Typescript (#7820)
• [docs] Add missing import to docs (#7928)
• [docs] Update automock configuration, add note related to manual mocks (#8051)
• [docs] Update/Organize TestSequencer and testSchedulerHelper code comments(#7984)
• [docs]: Fix image paths in SnapshotTesting.md for current and version 24 (#7872)
• [docs]: Improve runAllTimers doc (it exhausts the micro-task queue) (#8031)
• [docs]: Update CONTRIBUTING.md to add information about running jest with jest-circus locally (#8013).
• [expect]: Migrate to TypeScript (#7919, #8028)
• [jest-changed-files]: Migrate to TypeScript (#7827)
• [jest-circus]: Migrate to TypeScript (#7916)
• [jest-cli]: Migrate to TypeScript (#8024)
• [jest-diff]: Migrate to TypeScript (#7824, #8027)
• [jest-docblock]: Migrate to TypeScript (#7836)
• [jest-each]: Migrate to Typescript (#8007)
• [jest-each]: Refactor into multiple files with better types (#8018)
• [jest-environment-jsdom]: Migrate to TypeScript (#8003)
• [jest-environment-node]: Migrate to TypeScript (#7985)
• [jest-get-type]: Migrate to TypeScript (#7818)
• [jest-haste-map]: Migrate to TypeScript (#7854, #7951)
• [jest-jasmine2]: TS migration (#7970)
• [jest-leak-detector]: Migrate to TypeScript (#7825)
• [jest-matcher-utils]: Migrate to TypeScript (#7835)
• [jest-message-util]: Migrate to TypeScript (#7834)
• [jest-mock]: Migrate to TypeScript (#7847, #7850, #7971)
• [jest-phabricator]: Migrate to TypeScript (#7965)
• [jest-regex-util]: Migrate to TypeScript (#7822)
• [jest-repl]: Migrate to TypeScript (#8000)
• [jest-resolve-dependencies]: Migrate to TypeScript (#7922)
• [jest-resolve]: Migrate to TypeScript (#7871)
• [jest-runner]: Migrate to TypeScript (#7968)
• [jest-runtime]: Migrate to TypeScript (#7964, #7988)
• [jest-serializer]: Migrate to TypeScript (#7841)
• [jest-snapshot]: Migrate to TypeScript (#7899)
• [jest-util]: Migrate to TypeScript (#7844, #8021)
• [jest-validate]: Migrate to TypeScript (#7991)
• [jest-watcher]: Migrate to TypeScript (#7843)
• [jest-worker]: Migrate to TypeScript (#7853)
• [jest]: Migrate to TypeScript (#8024)
• [pretty-format]: Migrate to TypeScript (#7809, #7972)

Performance

• [jest-haste-map] Optimize haste map tracking of deleted files with Watchman. (#8056)

24.1.0

Features

• [jest-resolve]: Pass default resolver into custom resolvers (#7714)
• [jest-cli]: global{Setup,Teardown} use default export with es modules (#7750)
• [jest-runtime] Better error messages when the jest environment is used after teardown by async code (#7756)
• [jest-jasmine2] Will now only execute at most 5 concurrent tests within the same testsuite when using test.concurrent (#7770)
• [jest-circus] Same as [jest-jasmine2], only 5 tests will run concurrently by default (#7770)
• [jest-config] A new maxConcurrency option allows to change the number of tests allowed to run concurrently (#7770)

Fixes

• [jest-runtime] Fix for mocks not working with module name mapper (#7787)
• [jest-cli] Break dependency cycle when using Jest programmatically (#7707)
• [jest-config] Extract setupFilesAfterEnv from preset (#7724)
• [jest-cli] Do not execute any globalSetup or globalTeardown if there are no tests to execute (#7745)
• [jest-runtime] Lock down version of write-file-atomic (#7725)
• [jest-cli] Print log entries when logging happens after test environment is torn down (#7731)
• [jest-config] Do not use a uuid as name since that breaks caching (#7746)
• [jest-config] Make sure normalize can consume Defaults without warnings (#7742)
• [jest-config] Allow moduleFileExtensions without 'js' for custom runners (#7751)
• [jest-cli] Load transformers before installing require hooks (#7752)
• [jest-cli] Handle missing numTodoTests in test results (#7779)
• [jest-runtime] Exclude setup/teardown files from coverage report (#7790)
• [babel-jest] Throw an error if babel-jest tries to transform a file ignored by Babel (#7797)
• [babel-plugin-jest-hoist] Ignore TS type references when looking for out-of-scope references (#7799)
• [expect] fixed asymmetrical equality of cyclic objects (#7730)

Chore & Maintenance

• [jest] Update jest-junit to ^6.2.1 (#7739)
• [website] Fix broken help link on homepage (#7706)
• [docs] Changed Babel setup documentation to correctly compile async/await (#7701)

24.0.0

Features

• [jest-each] [BREAKING] Add primitive pretty printing for interpolated titles (#7694)
• [jest-runtime] Add jest.isolateModules for scoped module initialization (#6701)
• [jest-diff] [BREAKING] Support diffing numbers and booleans instead of returning null for different ones (#7605)
• [jest-diff] [BREAKING] Replace diff with diff-sequences package (#6961)
• [jest-cli] [BREAKING] Only set error process error codes when they are non-zero (#7363)
• [jest-config] [BREAKING] Deprecate setupTestFrameworkScriptFile in favor of new setupFilesAfterEnv (#7119)
• [jest-worker] [BREAKING] Add functionality to call a setup method in the worker before the first call and a teardown method when ending the farm (#7014)
• [jest-config] [BREAKING] Set default notifyMode to failure-change (#7024)
• [jest-haste-map] [BREAKING] Remove support for @providesModule (#6104)
• [jest-haste-map] [BREAKING] Replace internal data structures to improve performance (#6960)
• [jest-haste-map] [BREAKING] Use relative paths to allow remote caching (#7020)
• [jest-haste-map] [BREAKING] Remove name from hash in HasteMap.getCacheFilePath (#7218)
• [babel-preset-jest] [BREAKING] Export a function instead of an object for Babel 7 compatibility (#7203)
• [jest-haste-map] [BREAKING] Expose relative paths when getting the file iterator (#7321)
• [jest-cli] [BREAKING] Run code transforms over global{Setup,Teardown} (#7562)
• [jest-haste-map] Add hasteFS.getSize(path) (#7580)
• [jest-cli] Print version ending in -dev when running a local Jest clone (#7582)
• [jest-cli] Add Support for globalSetup and globalTeardown in projects (#6865)
• [jest-runtime] Add extraGlobals to config to load extra global variables into the execution vm (#7454)
• [jest-util] Export specialChars containing Unicode characters and ANSI escapes for console output (#7532)
• [jest-config] Handle typescript (ts and tsx) by default (#7533)
• [jest-validate] Add support for comments in package.json using a "//" key (#7295)
• [jest-config] Add shorthand for watch plugins and runners (#7213)
• [jest-jasmine2/jest-circus/jest-cli] Add test.todo (#6996)
• [pretty-format] Option to not escape strings in diff messages (#5661)
• [jest-haste-map] Add getFileIterator to HasteFS for faster file iteration (#7010)
• [jest-config] Add readConfigs function, previously in jest-cli (#7096)
• [jest-snapshot] Enable configurable snapshot paths (#6143)
• [pretty-format] Support HTMLCollection and NodeList in DOMCollection plugin (#7125)
• [jest-runtime] Pass the normalized configuration to script transformers (#7148)
• [expect] Improve report when assertion fails, part 3 (#7152)
• [jest-runtime] If require fails without a file extension, print all files that match with one (#7160)
• [jest-haste-map] Make ignorePattern optional (#7166)
• [jest-haste-map] Add getCacheFilePath to get the path to the cache file for a HasteMap instance (#7217)
• [jest-runtime] Remove cacheDirectory from ignorePattern for HasteMap if not necessary (#7166)
• [jest-validate] Add syntax to validate multiple permitted types (#7207)
• [jest-config] Accept an array as as well as a string for testRegex (#7209)
• [expect/jest-matcher-utils] Improve report when assertion fails, part 4 (#7241)
• [expect/jest-matcher-utils] Improve report when assertion fails, part 5 (#7557)
• [expect] Check constructor equality in .toStrictEqual() (#7005)
• [jest-util] Add jest.getTimerCount() to get the count of scheduled fake timers (#7285)
• [jest-config] Add dependencyExtractor option to use a custom module to extract dependencies from files (#7313, #7349, #7350, #7362)
• [jest-haste-map] Accept a getCacheKey method in hasteImplModulePath modules to reset the cache when the logic changes (#7350)
• [jest-config] Add haste.computeSha1 option to compute the sha-1 of the files in the haste map (#7345)
• [expect] expect(Infinity).toBeCloseTo(Infinity) Treats Infinity as equal in toBeCloseTo matcher (#7405)
• [jest-worker] Add node worker-thread support to jest-worker (#7408)
• [jest-config] Allow bail setting to be configured with a number allowing tests to abort after n of failures (#7335)
• [jest-config] Allow % based configuration of --max-workers (#7494)
• [jest-runner] Instantiate the test environment class with the current testPath (#7442)
• [jest-config] Always resolve jest-environment-jsdom from jest-config (#7476)
• [expect] Improve report when assertion fails, part 6 (#7621)
• [jest-worker] Add enableWorkerThreads option to explicitly opt-in to worker_threads if available (#7681)

Fixes

• [expect] Accept inherited properties in toHaveProperty matcher (#7686)
• [jest-diff] Do not claim that -0 and 0 have no visual difference (#7605)
• [jest-mock] Fix automock for numeric function names (#7653)
• [jest-config] Ensure existsSync is only called with a string parameter (#7607)
• [expect] toStrictEqual considers sparseness of arrays. (#7591)
• [jest-cli] Fix empty coverage data for untested files (#7388)
• [jest-cli] [BREAKING] Do not use text-summary coverage reporter by default if other reporters are configured (#7058)
• [jest-mock] [BREAKING] Fix bugs with mock/spy result tracking of recursive functions (#6381)
• [jest-haste-map] [BREAKING] Recover files correctly after haste name collisions are fixed (#7329)
• [pretty-format] [BREAKING] Omit non-enumerable symbol properties (#7448)
• [*] [BREAKING] Upgrade to Babel 7, dropping support for Babel 6 (#7016)
• [jest-cli] Avoid watch mode causing bad terminal behavior in some cases (#7523)
• [jest-runner/jest-worker] Fix missing console output in verbose mode (#6871)
• [expect] Standardize file naming in expect (#7306)
• [jest-each] Add empty array validation check (#7249)
• [jest-cli] Interrupt tests if interactive watch plugin key is pressed (#7222)
• [jest-each] Add each array validation check (#7033)
• [jest-haste-map] Do not visit again files with the same sha-1 (#6990)
• [jest-jasmine2] Fix memory leak in Error objects hold by the framework (#6965)
• [jest-haste-map] Fixed Haste whitelist generation for scoped modules on Windows (#6980)
• [jest-mock] Fix inheritance of static properties and methods in mocks (#7003)
• [jest-mock] Fix mocking objects without Object.prototype in their prototype chain (#7003)
• [jest-mock] Check _isMockFunction is true rather than truthy on potential mocks (#7017)
• [jest-cli] Update jest-cli to show git ref in message when using changedSince (#7028)
• [jest-jasmine2] Fix crash when test return Promise rejected with null (#7049)
• [jest-runtime] Check _isMockFunction is true rather than truthy on potential global mocks (#7017)
• [jest-jasmine] Show proper error message from async assert errors (#6821)
• [jest-jasmine2] Better error message when a describe block is empty (#6372)
• [jest-jasmine2] Pending calls inside async tests are reported as pending not failed (#6782)
• [jest-circus] Better error message when a describe block is empty (#6372)
• [jest-jasmine2] Add missing testLocationResults for xit and fit (#6482)
• [expect] Return false from asymmetric matchers if received value isn’t string (#7107)
• [jest-cli] Fix unhandled error when a bad revision is provided to changedSince (#7115)
• [jest-config] Moved dynamically assigned cwd from jest-cli to default configuration in jest-config (#7146)
• [jest-config] Fix getMaxWorkers on termux (#7154)
• [jest-runtime] Throw an explicit error if js is missing from moduleFileExtensions (#7160)
• [jest-runtime] Fix missing coverage when using negative glob pattern in testMatch (#7170)
• [*] Ensure maxWorkers is at least 1 (was 0 in some cases where there was only 1 CPU) (#7182)
• [jest-runtime] Fix transform cache invalidation when requiring a test file from multiple projects (#7186)
• [jest-changed-files] Return correctly the changed files when using lastCommit=true on Mercurial repositories (#7228)
• [babel-jest] Cache includes babel environment variables (#7239)
• [jest-config] Use strings instead of RegExp instances in normalized configuration (#7251)
• [jest-circus] Make sure to display real duration even if time is mocked (#7264)
• [expect] Improves the failing message for toStrictEqual matcher. (#7224)
• [expect] Improves the failing message for toEqual matcher. (#7325)
• [jest-resolve] Fix not being able to resolve path to mapped file with custom platform (#7312)
• [jest-message-util] Improve parsing of error messages for unusually formatted stack traces (#7319)
• [jest-runtime] Ensure error message text is not lost on errors with code frames (#7319)
• [jest-haste-map] Fix to resolve path that is start with words same as rootDir (#7324)
• [expect] Fix toMatchObject matcher when used with Object.create(null) (#7334)
• [jest-haste-map] Remove legacy condition for duplicate module detection (#7333)
• [jest-haste-map] Fix require detection with trailing commas and ignore import typeof modules (#7385)
• [jest-cli] Fix to set prettierPath via config file (#7412)
• [expect] Test more precisely for class instance getters (#7477)
• [jest-cli] Support dashed args (#7497)
• [jest-cli] Fix to run in band tests if watch mode enable when runInBand arg used (#7518)
• [jest-runtime] Fix mistake as test files when run coverage issue. (#7506)
• [jest-cli] print info about passWithNoTests flag (#7309)
• [pretty-format] Omit unnecessary symbol filter for object keys (#7457)
• [jest-runtime] Fix requireActual on node_modules with mock present (#7404)
• [jest-resolve] Fix isBuiltinModule to support versions of node without module.builtinModules (#7565)
• [babel-jest] Set cwd to be resilient to it changing during the runtime of the tests (#7574)
• [jest-snapshot] Write and read snapshots from disk even if fs is mocked (#7080)
• [jest-config] Normalize config.cwd and config.rootDir using `realpath (#7598)
• [jest-environment-node] Fix buffer property is not ArrayBuffer issue. (#7626)
• [babel-plugin-jest-hoist] Ignore TS type annotations when looking for out-of-scope references (#7641)
• [jest-config] Add name to project if one does not exist to pick correct resolver (#5862)
• [jest-runtime] Pass watchPathIgnorePatterns to Haste instance (#7585)
• [jest-runtime] Resolve mock files via Haste when using require.resolve (#7687)

Chore & Maintenance

• [*] [BREAKING] Require Node.js 6+ for all packages (#7258)
• [jest-util] [BREAKING] Remove long-deprecated globals for fake timers (#7285)
• [*] [BREAKING] Upgrade to Micromatch 3 (#6650)
• [*] [BREAKING] Remove regenerator-runtime injection (#7595)
• [jest-worker] Disable worker_threads to avoid issues with libraries to ready for it (#7681)
• [docs] Fix message property in custom matcher example to return a function instead of a constant. (#7426)
• [jest-circus] Standardize file naming in jest-circus (#7301)
• [docs] Add synchronous test.each setup (#7150)
• [docs] Add this.extend to the Custom Matchers API reference (#7130)
• [docs] Fix default value for coverageReporters value in configuration docs (#7126)
• [docs] Add link for jest-extended in expect docs (#7078)
• [jest-util] Add ErrorWithStack class (#7067)
• [docs] Document --runTestsByPath CLI parameter (#7046)
• [docs] Fix babel-core installation instructions (#6745)
• [docs] Explain how to rewrite assertions to avoid large irrelevant diff (#6971)
• [examples] add example using Babel 7 (#6983)
• [docs] Replace shallow equality with referential identity in ExpectAPI.md (#6991)
• [jest-changed-files] Refactor to use execa over child_process (#6987)
• [*] Bump dated dependencies (#6978)
• [scripts] Don’t make empty sub-folders for ignored files in build folder (#7001)
• [docs] Add missing export statement in puppeteer_environment.js under docs/Puppeteer.md (#7127)
• [docs] Removed useless expect.assertions in TestingAsyncCode.md (#7131)
• [docs] Remove references to @providesModule which isn't supported anymore (#7147)
• [docs] Update setupFiles documentation for clarity (#7187)
• [docs] Change require.require* to jest.require* (#7210)
• [jest-circus] Add readme.md (#7198)
• [jest-editor-support] Remove from the repository (#7232)
• [jest-test-typescript-parser] Remove from the repository (#7232)
• [tests] Free tests from the dependency on value of FORCE_COLOR (#6585)
• [*] Add babel plugin to make sure Jest is unaffected by fake Promise implementations (#7225)
• [docs] Add correct default value for testUrl config option (#7277)
• [docs] Remove duplicate code in MockFunctions (#7297)
• [*] Add check for Facebook copyright headers on CI (#7370)
• [*] Update Facebook copyright headers (#7589)
• [jest-haste-map] Refactor dependencyExtractor and tests (#7385)
• [docs] Clearify conditional setting of NODE_ENV (#7369)
• [docs] Clarify conditional setting of NODE_ENV (#7369)
• [*] Standardize file names (#7316, #7266, #7238, #7314, #7467, #7464), #7471)
• [docs] Add testPathIgnorePatterns in CLI documentation (#7440)
• [docs] Removed misleading text about describe() grouping together tests into a test suite (#7434)
• [diff-sequences] Add performance benchmark to package (#7603)
• [*] Replace as many Object.assign with object spread as possible (#7627)
• [ci] Initial support for Azure Pipelines (#7556)

Performance

• [jest-mock] Improve getType function performance. (#7159)