jest-docblock: Versions

Features

[jest-worker] Adds workerIdleMemoryLimit option which is used as a check for worker memory leaks >= Node 16.11.0 and recycles child workers as required. (#13056)

Fixes

[jest-haste-map] Increase the maximum possible file size that jest-haste-map can handle (#13094)

New Contributors

@matheus-rodrigues00 made their first contribution in https://github.com/facebook/jest/pull/13090
@lanpai made their first contribution in https://github.com/facebook/jest/pull/13094

Full Changelog: https://github.com/facebook/jest/compare/v29.0.0-alpha.1...v29.0.0-alpha.3

Features

[jest-config] [BREAKING] Make snapshotFormat default to escapeString: false and printBasicPrototype: false (#13036)
[jest-environment-jsdom] [BREAKING] Upgrade to jsdom@20 (#13037)

Chore & Maintenance

[*] [BREAKING] Drop support for Node v12 and v17 (#13033)
[jest-leak-detector] Remove support for weak-napi (#13035)

Full Changelog: https://github.com/facebook/jest/compare/v28.1.3...v29.0.0-alpha.0

Features

[jest] Expose Config type (#12848)
[@jest/reporters] Improve GitHubActionsReporters annotation format (#12826)
[@jest/types] Infer argument types passed to test and describe callback functions from each tables (#12885, #12905)

Fixes

[@jest/expect-utils] Fix deep equality of ImmutableJS OrderedMaps (#12763)
[jest-docblock] Handle multiline comments in parseWithComments (#12845)
[jest-mock] Improve spyOn error messages (#12901)
[jest-runtime] Correctly report V8 coverage with resetModules: true (#12912)
[jest-worker] Make JestWorkerFarm helper type to include methods of worker module that take more than one argument (#12839)

Chore & Maintenance

[docs] Updated docs to indicate that jest-environment-jsdom is a separate package #12828
[docs] Document the comments used by coverage providers #12835
[docs] Use docusaurus-remark-plugin-tab-blocks to format tabs with code examples (#12859)
[jest-haste-map] Bump walker version (#12324)
[expect] Adjust typings of lastCalledWith, nthCalledWith, toBeCalledWith matchers to allow a case there a mock was called with no arguments (#12807)
[@jest/expect-utils] Fix deep equality of ImmutableJS Lists (#12763)
[jest-core] Do not collect SIGNREQUEST as open handles (#12789)

New Contributors

@owjsub made their first contribution in https://github.com/facebook/jest/pull/12324
@Aveline-art made their first contribution in https://github.com/facebook/jest/pull/12831
@spenserblack made their first contribution in https://github.com/facebook/jest/pull/12836
@dimitropoulos made their first contribution in https://github.com/facebook/jest/pull/12817
@ullumullu made their first contribution in https://github.com/facebook/jest/pull/12845
@limonte made their first contribution in https://github.com/facebook/jest/pull/12851
@Dennis273 made their first contribution in https://github.com/facebook/jest/pull/12870
@shreykinshu made their first contribution in https://github.com/facebook/jest/pull/12886
@pbomb made their first contribution in https://github.com/facebook/jest/pull/12899
@ChrisCoastal made their first contribution in https://github.com/facebook/jest/pull/12887
@HyunseungLee-Travis made their first contribution in https://github.com/facebook/jest/pull/12810

Full Changelog: https://github.com/facebook/jest/compare/v28.1.0...v28.1.1

Features

[jest-worker] Add JestWorkerFarm helper type (#12753)

Fixes

[*] Lower Node 16 requirement to 16.10 from 16.13 due to a Node bug that causes memory and performance issues (#12754)

Full Changelog: https://github.com/facebook/jest/compare/v28.0.1...v28.0.2

Blog post: https://jestjs.io/blog/2022/04/25/jest-28

Features

[babel-jest] Export createTransformer function (#12399)
[expect] Expose AsymmetricMatchers, MatcherFunction and MatcherFunctionWithState interfaces (#12363, #12376)
[jest-circus] Support error logging before retry (#12201)
[jest-circus, jest-jasmine2] Allowed classes and functions as describe and it/test names (#12484)
[jest-cli, jest-config] [BREAKING] Remove testURL config, use testEnvironmentOptions.url instead (#10797)
[jest-cli, jest-core] Add --shard parameter for distributed parallel test execution (#12546)
[jest-cli] [BREAKING] Remove undocumented --timers option (#12572)
[jest-config] [BREAKING] Stop shipping jest-environment-jsdom by default (#12354)
[jest-config] [BREAKING] Stop shipping jest-jasmine2 by default (#12355)
[jest-config, @jest/types] Add ci to GlobalConfig (#12378)
[jest-config] [BREAKING] Rename moduleLoader to runtime (#10817)
[jest-config] [BREAKING] Rename extraGlobals to sandboxInjectedGlobals (#10817)
[jest-config] [BREAKING] Throw an error instead of showing a warning if multiple configs are used (#12510)
[jest-config] [BREAKING] Do not normalize long deprecated configuration options preprocessorIgnorePatterns,scriptPreprocessor, setupTestFrameworkScriptFile and testPathDirs (#1251270110)
[jest-cli, jest-core] Add --ignoreProjects CLI argument to ignore test suites by project name (#12620)
[jest-core] Pass project config to globalSetup/globalTeardown function as second argument (#12440)
[jest-core] Stabilize test runners with event emitters (#12641)
[jest-core, jest-watcher] [BREAKING] Move TestWatcher class to jest-watcher package (#12652)
[jest-core] Allow using Summary Reporter as stand-alone reporter (#12687)
[jest-environment-jsdom] [BREAKING] Upgrade jsdom to 19.0.0 (#12290)
[jest-environment-jsdom] [BREAKING] Add default browser condition to exportConditions for jsdom environment (#11924)
[jest-environment-jsdom] [BREAKING] Pass global config to Jest environment constructor for jsdom environment (#12461)
[jest-environment-jsdom] [BREAKING] Second argument context to constructor is mandatory (#12469)
[jest-environment-node] [BREAKING] Add default node and node-addon conditions to exportConditions for node environment (#11924)
[jest-environment-node] [BREAKING] Pass global config to Jest environment constructor for node environment (#12461)
[jest-environment-node] [BREAKING] Second argument context to constructor is mandatory (#12469)
[jest-environment-node] Add all available globals to test globals, not just explicit ones (#12642, #12696)
[@jest/expect] New module which extends expect with jest-snapshot matchers (#12404, #12410, #12418)
[@jest/expect-utils] New module exporting utils for expect (#12323)
[@jest/fake-timers] [BREAKING] Rename timers configuration option to fakeTimers (#12572)
[@jest/fake-timers] [BREAKING] Allow jest.useFakeTimers() and projectConfig.fakeTimers to take an options bag (#12572)
[jest-haste-map] [BREAKING] HasteMap.create now returns a promise (#12008)
[jest-haste-map] Add support for dependencyExtractor written in ESM (#12008)
[jest-mock] [BREAKING] Rename exported utility types ClassLike, FunctionLike, ConstructorLikeKeys, MethodLikeKeys, PropertyLikeKeys; remove exports of utility types ArgumentsOf, ArgsType, ConstructorArgumentsOf - TS builtin utility types ConstructorParameters and Parameters should be used instead (#12435, #12489)
[jest-mock] Improve isMockFunction to infer types of passed function (#12442)
[jest-mock] [BREAKING] Improve the usage of jest.fn generic type argument (#12489)
[jest-mock] Add support for auto-mocking async generator functions (#11080)
[jest-mock] Add contexts member to mock functions (#12601)
[@jest/reporters] Add GitHub Actions reporter (#11320, #12658)
[@jest/reporters] Pass reporterContext to custom reporter constructors as third argument (#12657)
[jest-resolve] [BREAKING] Add support for package.json exports (#11961, #12373)
[jest-resolve] Support package self-reference (#12682)
[jest-resolve, jest-runtime] Add support for data: URI import and mock (#12392)
[jest-resolve, jest-runtime] Add support for async resolver (#11540)
[jest-resolve] [BREAKING] Remove browser?: boolean from resolver options, conditions: ['browser'] should be used instead (#12707)
[jest-resolve] Expose JestResolver, AsyncResolver, SyncResolver, PackageFilter, PathFilter and PackageJSON types (#12707, (#12712)
[jest-runner] Allow setupFiles module to export an async function (#12042)
[jest-runner] Allow passing testEnvironmentOptions via docblocks (#12470)
[jest-runner] Expose CallbackTestRunner, EmittingTestRunner abstract classes and CallbackTestRunnerInterface, EmittingTestRunnerInterface to help typing third party runners (#12646, #12715)
[jest-runner] Lock version of source-map-support to 0.5.13 (#12720)
[jest-runtime] [BREAKING] Runtime.createHasteMap now returns a promise (#12008)
[jest-runtime] Calling jest.resetModules function will clear FS and transform cache (#12531)
[jest-runtime] [BREAKING] Remove Context type export, it must be imported from @jest/test-result (#12685)
[jest-runtime] Add import.meta.jest (#12698)
[@jest/schemas] New module for JSON schemas for Jest's config (#12384)
[@jest/source-map] Migrate from source-map to @jridgewell/trace-mapping (#12692)
[jest-transform] [BREAKING] Make it required for process() and processAsync() methods to always return structured data (#12638)
[jest-test-result] Add duration property to JSON test output (#12518)
[jest-watcher] [BREAKING] Make PatternPrompt class to take entityName as third constructor parameter instead of this._entityName (#12591)
[jest-worker] [BREAKING] Allow only absolute workerPath (#12343)
[jest-worker] [BREAKING] Default to advanced serialization when using child process workers (#10983)
[pretty-format] New maxWidth parameter (#12402)

Fixes

[*] Use sha256 instead of md5 as hashing algortihm for compatibility with FIPS systems (#12722)
[babel-jest] [BREAKING] Pass rootDir as root in Babel's options (#12689)
[expect] Move typings of .not, .rejects and .resolves modifiers outside of Matchers interface (#12346)
[expect] Throw useful error if expect.extend is called with invalid matchers (#12488)
[expect] Fix iterableEquality ignores other properties (#8359)
[expect] Fix print for the closeTo matcher (#12626)
[jest-changed-files] Improve changedFilesWithAncestor pattern for Mercurial SCM (#12322)
[jest-circus, @jest/types] Disallow undefined value in TestContext type (#12507)
[jest-config] Correctly detect CI environment and update snapshots accordingly (#12378)
[jest-config] Pass moduleTypes to ts-node to enforce CJS when transpiling (#12397)
[jest-config] [BREAKING] Add mjs and cjs to default moduleFileExtensions config (#12578)
[jest-config, jest-haste-map] Allow searching for tests in node_modules by exposing retainAllFiles (#11084)
[jest-core] [BREAKING] Exit with status 1 if no tests are found with --findRelatedTests flag (#12487)
[jest-core] Do not report unref-ed subprocesses as open handles (#12705)
[jest-each] %# is not replaced with index of the test case (#12517)
[jest-each] Fixes error message with incorrect count of missing arguments (#12464)
[jest-environment-jsdom] Make jsdom accessible to extending environments again (#12232)
[jest-environment-jsdom] Log JSDOM errors more cleanly (#12386)
[jest-environment-node] Add MessageChannel, MessageEvent to globals (#12553)
[jest-environment-node] Add structuredClone to globals (#12631)
[@jest/expect-utils] [BREAKING] Fix false positives when looking for undefined prop (#8923)
[jest-haste-map] Don't use partial results if file crawl errors (#12420)
[jest-haste-map] Make watchman existence check lazy+async (#12675)
[jest-jasmine2, jest-types] [BREAKING] Move all jasmine specific types from @jest/types to its own package (#12125)
[jest-jasmine2] Do not set duration to 0 for skipped tests (#12518)
[jest-matcher-utils] Pass maxWidth to pretty-format to avoid printing every element in arrays by default (#12402)
[jest-mock] Fix function overloads for spyOn to allow more correct type inference in complex object (#12442)
[jest-mock] Handle overridden Function.name property (#12674)
[@jest/reporters] Notifications generated by the --notify flag are no longer persistent in GNOME Shell. (#11733)
[@jest/reporters] Move missing icon file which is needed for NotifyReporter class. (#12593)
[@jest/reporters] Update v8-to-istanbul (#12697)
[jest-resolver] Call custom resolver with core node.js modules (#12654)
[jest-runner] Correctly resolve source-map-support (#12706)
[jest-worker] Fix Farm execution results memory leak (#12497)

Chore & Maintenance

[*] [BREAKING] Drop support for Node v10 and v15 and target first LTS 16.13.0 (#12220)
[*] [BREAKING] Drop support for typescript@3.8, minimum version is now 4.3 (#11142, #12648)
[*] Bundle all .d.ts files into a single index.d.ts per module (#12345)
[*] Use globalThis instead of global (#12447)
[babel-jest] [BREAKING] Only export createTransformer (#12407)
[docs] Add note about not mixing done() with Promises (#11077)
[docs, examples] Update React examples to match with the new React guidelines for code examples (#12217)
[docs] Add clarity for module factory hoisting limitations (#12453)
[docs] Add more information about how code transformers work (#12407)
[docs] Add upgrading guide (#12633)
[expect] [BREAKING] Remove support for importing build/utils (#12323)
[expect] [BREAKING] Migrate to ESM (#12344)
[expect] [BREAKING] Snapshot matcher types are moved to @jest/expect (#12404)
[jest-cli] Update yargs to v17 (#12357)
[jest-config] [BREAKING] Remove getTestEnvironment export (#12353)
[jest-config] [BREAKING] Rename config option name to id (#11981)
[jest-create-cache-key-function] Added README.md file with basic usage instructions (#12492)
[@jest/core] Use index.ts instead of jest.ts as main export (#12329)
[jest-environment-jsdom] [BREAKING] Migrate to ESM (#12340)
[jest-environment-node] [BREAKING] Migrate to ESM (#12340)
[jest-haste-map] Remove legacy isRegExpSupported (#12676)
[@jest/fake-timers] Update @sinonjs/fake_timers to v9 (#12357)
[jest-jasmine2, jest-runtime] [BREAKING] Use Symbol to pass jest.setTimeout value instead of jasmine specific logic (#12124)
[jest-phabricator] [BREAKING] Migrate to ESM (#12341)
[jest-resolve] [BREAKING] Make requireResolveFunction argument mandatory (#12353)
[jest-runner] [BREAKING] Remove some type exports from @jest/test-result (#12353)
[jest-runner] [BREAKING] Second argument to constructor (Context) is not optional (#12640)
[jest-serializer] [BREAKING] Deprecate package in favour of using v8 APIs directly (#12391)
[jest-snapshot] [BREAKING] Migrate to ESM (#12342)
[jest-transform] Update write-file-atomic to v4 (#12357)
[jest-types] [BREAKING] Remove Config.Glob and Config.Path (#12406)
[jest] Use index.ts instead of jest.ts as main export (#12329)

Performance

[jest-haste-map] [BREAKING] Default to node crawler over shelling out to find if watchman is not enabled (#12320)

New Contributors

@marcelltoth made their first contribution in https://github.com/facebook/jest/pull/12290
@soryy708 made their first contribution in https://github.com/facebook/jest/pull/12010
@dmitryvinn-fb made their first contribution in https://github.com/facebook/jest/pull/12379
@cola119 made their first contribution in https://github.com/facebook/jest/pull/12375
@holylander made their first contribution in https://github.com/facebook/jest/pull/12257
@jsjoeio made their first contribution in https://github.com/facebook/jest/pull/11077
@tbossi made their first contribution in https://github.com/facebook/jest/pull/12392
@ryanwilsonperkin made their first contribution in https://github.com/facebook/jest/pull/12402
@yesmeck made their first contribution in https://github.com/facebook/jest/pull/12408
@benblank made their first contribution in https://github.com/facebook/jest/pull/12441
@john-u made their first contribution in https://github.com/facebook/jest/pull/12453
@cjr125 made their first contribution in https://github.com/facebook/jest/pull/11084
@davidjgoss made their first contribution in https://github.com/facebook/jest/pull/11566
@SixTfour made their first contribution in https://github.com/facebook/jest/pull/8923
@aditya04848 made their first contribution in https://github.com/facebook/jest/pull/12385
@rick-shar-ww made their first contribution in https://github.com/facebook/jest/pull/8333
@shooit made their first contribution in https://github.com/facebook/jest/pull/11080
@d7my11 made their first contribution in https://github.com/facebook/jest/pull/8359
@BudgieInWA made their first contribution in https://github.com/facebook/jest/pull/11733
@IIIEII made their first contribution in https://github.com/facebook/jest/pull/12497
@mhnaeem made their first contribution in https://github.com/facebook/jest/pull/12492
@adrianbienias made their first contribution in https://github.com/facebook/jest/pull/12501
@TrickyPi made their first contribution in https://github.com/facebook/jest/pull/12510
@F3n67u made their first contribution in https://github.com/facebook/jest/pull/12517
@dmitryvinn made their first contribution in https://github.com/facebook/jest/pull/12532
@brandon-leapyear made their first contribution in https://github.com/facebook/jest/pull/12526
@marionebl made their first contribution in https://github.com/facebook/jest/pull/12546
@matthias-ccri made their first contribution in https://github.com/facebook/jest/pull/12601
@Kaiguang made their first contribution in https://github.com/facebook/jest/pull/12616
@ockham made their first contribution in https://github.com/facebook/jest/pull/11320
@msonnberger made their first contribution in https://github.com/facebook/jest/pull/12608
@nate-io made their first contribution in https://github.com/facebook/jest/pull/12607
@fatso83 made their first contribution in https://github.com/facebook/jest/pull/12407
@Araxeus made their first contribution in https://github.com/facebook/jest/pull/12631
@Udit-takkar made their first contribution in https://github.com/facebook/jest/pull/11981
@ChocolateLoverRaj made their first contribution in https://github.com/facebook/jest/pull/12654
@adi611 made their first contribution in https://github.com/facebook/jest/pull/12555
@fisker made their first contribution in https://github.com/facebook/jest/pull/12653
@flakolefluk made their first contribution in https://github.com/facebook/jest/pull/12464
@L4vlet made their first contribution in https://github.com/facebook/jest/pull/12626
@Gerrit0 made their first contribution in https://github.com/facebook/jest/pull/12612
@robhogan made their first contribution in https://github.com/facebook/jest/pull/12676
@wrslatz made their first contribution in https://github.com/facebook/jest/pull/12693
@katlim-br made their first contribution in https://github.com/facebook/jest/pull/12702
@zackasaurus made their first contribution in https://github.com/facebook/jest/pull/12201
@darmbrust made their first contribution in https://github.com/facebook/jest/pull/12722
@Ash-KODES made their first contribution in https://github.com/facebook/jest/pull/12565

Full Changelog: https://github.com/facebook/jest/compare/v27.5.1...v28.0.0

Features

[jest-config] [BREAKING] Throw an error instead of showing a warning if multiple configs are used (#12510)
[jest-mock] [BREAKING] Rename exported utility types ClassLike, FunctionLike, ConstructorLikeKeys, MethodLikeKeys, PropertyLikeKeys; remove exports of utility types ArgumentsOf, ArgsType, ConstructorArgumentsOf - TS builtin utility types ConstructorParameters and Parameters should be used instead (#12435, #12489)
[jest-mock] [BREAKING] Improve the usage of jest.fn generic type argument (#12489)
[jest-runner] Allow setupFiles module to export an async function (#12042)

Fixes

[jest-circus, @jest/types] Disallow undefined value in TestContext type (#12507)
[jest-each] %# is not replaced with index of the test case (#12517)
[jest-reporters] Notifications generated by the --notify flag are no longer persistent in GNOME Shell. (#11733)
[jest-worker] Fix Farm execution results memory leak (#12497)

Chore & Maintenance

[jest-create-cache-key-function] Added README.md file with basic usage instructions (#12492)

New Contributors

@BudgieInWA made their first contribution in https://github.com/facebook/jest/pull/11733
@IIIEII made their first contribution in https://github.com/facebook/jest/pull/12497
@mhnaeem made their first contribution in https://github.com/facebook/jest/pull/12492
@adrianbienias made their first contribution in https://github.com/facebook/jest/pull/12501
@TrickyPi made their first contribution in https://github.com/facebook/jest/pull/12510
@F3n67u made their first contribution in https://github.com/facebook/jest/pull/12517

Full Changelog: https://github.com/facebook/jest/compare/v28.0.0-alpha.5...v28.0.0-alpha.6

Fixes

[jest-resolve] Support directory remapping in package.json exports (#12373)

Full Changelog: https://github.com/facebook/jest/compare/v28.0.0-alpha.2..v28.0.0-alpha.3

Features

[jest-config] [BREAKING] Stop shipping jest-environment-jsdom by default (#12354)
[jest-config] [BREAKING] Stop shipping jest-jasmine2 by default (#12355)
[jest-environment-jsdom] [BREAKING] Upgrade jsdom to 19.0.0 (#12290)
[jest-environment-jsdom] [BREAKING] Add default browser condition to exportConditions for jsdom environment (#11924)
[jest-environment-node] [BREAKING] Add default node and node-addon conditions to exportConditions for node environment (#11924)
[@jest/expect-utils] New module exporting utils for expect (#12323)
[jest-resolve] [BREAKING] Add support for package.json exports (#11961)
[jest-worker] [BREAKING] Allow only absolute workerPath (#12343)

Fixes

[expect] Move typings of .not, .rejects and .resolves modifiers outside of Matchers interface (#12346)
[jest-environment-jsdom] Make jsdom accessible to extending environments again (#12232)
[jest-jasmine2, jest-types] [BREAKING] Move all jasmine specific types from @jest/types to its own package (#12125)

Chore & Maintenance

[*] [BREAKING] Drop support for Node v10 and v15 and target first LTS 16.13.0 (#12220)
[*] [BREAKING] Drop support for typescript@3.8, minimum version is now 4.2 (#11142)
[*] Bundle all .d.ts files into a single index.d.ts per module (#12345)
[expect] [BREAKING] Remove support for importing build/utils (#12323)
[expect] [BREAKING] Migrate to ESM (#12344)
[jest-cli] Update yargs to v17 (#12357)
[jest-config] [BREAKING] Remove getTestEnvironment export (#12353)
[@jest/core] Use index.ts instead of jest.ts as main export (#12329)
[jest-environment-jsdom] [BREAKING] Migrate to ESM (#12340)
[jest-environment-node] [BREAKING] Migrate to ESM (#12340)
[@jest/fake-timers] Update @sinonjs/fake_timers to v9 (#12357)
[jest-jasmine2, jest-runtime] [BREAKING] Use Symbol to pass jest.setTimeout value instead of jasmine specific logic (#12124)
[jest-phabricator] [BREAKING] Migrate to ESM (#12341)
[jest-resolve] [BREAKING] Make requireResolveFunction argument mandatory (#12353)
[jest-runner] [BREAKING] Remove some type exports from @jest/test-result (#12353)
[jest-snapshot] [BREAKING] Migrate to ESM (#12342)
[jest-transform] Update write-file-atomic to v4 (#12357)
[jest] Use index.ts instead of jest.ts as main export (#12329)

Performance

[jest-haste-map] [BREAKING] Default to node crawler over shelling out to find if watchman is not enabled (#12320)

New Contributors

@marcelltoth made their first contribution in https://github.com/facebook/jest/pull/12290

Full Changelog: https://github.com/facebook/jest/compare/v27.5.1...v28.0.0-alpha.0

Features

[jest-config] Support comments in JSON config file (#12316)
[pretty-format] Expose ConvertAnsi plugin (#12308)

Fixes

[expect] Add type definitions for asymmetric closeTo matcher (#12304)
[jest-cli] Load binary via exported API (#12315)
[jest-config] Replace jsonlint with parse-json (#12316)
[jest-repl] Make module importable (#12311 & #12315)

Chore & Maintenance

[*] Avoid anonymous default exports (#12313)

New Contributors

@zoltan-boros made their first contribution in https://github.com/facebook/jest/pull/12206

Full Changelog: https://github.com/facebook/jest/compare/v27.5.0...v27.5.1

Features

[expect] Add asymmetric matcher expect.closeTo (#12243)
[jest-mock] Added mockFn.mock.lastCall to retrieve last argument (#12285)

Fixes

[expect] Add a fix for .toHaveProperty('') (#12251)
[jest-each, @jest/globals] Allow passing ReadonlyArray type of a table to describe.each and test.each (#12297)
[@jest/globals] Add missing options argument to jest.doMock typing (#12292)
[jest-environment-node] Add atob and btoa (#12269)
[jest-matcher-utils] Correct diff for expected asymmetric matchers (#12264)
[jest-message-util] Fix .getTopFrame() (and toMatchInlineSnapshot()) with mjs files (#12277)

Chore & Maintenance

[*] Update graceful-fs to ^4.2.9 (#11749)

Performance

[jest-resolve] perf: skip error creation on not found stat calls (#11749)

New Contributors

@markjm made their first contribution in https://github.com/facebook/jest/pull/11749
@benjamingr made their first contribution in https://github.com/facebook/jest/pull/12266
@aduh95 made their first contribution in https://github.com/facebook/jest/pull/12269
@piranna made their first contribution in https://github.com/facebook/jest/pull/12272
@od-c0d3r made their first contribution in https://github.com/facebook/jest/pull/12234
@davidnormo made their first contribution in https://github.com/facebook/jest/pull/12264
@mshima made their first contribution in https://github.com/facebook/jest/pull/12277
@Cambuchi made their first contribution in https://github.com/facebook/jest/pull/12246
@vladsholokhov made their first contribution in https://github.com/facebook/jest/pull/12185
@robdy made their first contribution in https://github.com/facebook/jest/pull/12254
@Michael-M-Judd made their first contribution in https://github.com/facebook/jest/pull/12212

Full Changelog: https://github.com/facebook/jest/compare/v27.4.7...v27.5.0

Features

[expect] Enhancing the toHaveProperty matcher to support array selection (#12092)
[jest-core] Add support for testResultsProcessor written in ESM (#12006)
[jest-diff, pretty-format] Add compareKeys option for custom sorting of object keys (#11992)
[jest-mock] Add ts-jest mock util functions (#12089)

Fixes

[expect] Allow again expect.Matchers generic with single value (#11986)
[jest-circus, jest-jasmine2] Avoid false concurrent test failures due to unhandled promise rejections (#11987)
[jest-config] Add missing slash dependency to package.json (#12080)
[jest-core] Incorrect detection of open ZLIB handles (#12022)
[jest-diff] Break dependency cycle (#10818)
[jest-environment-jsdom] Add @types/jsdom dependency (#11999)
[jest-environment-jsdom] Do not reset the global.document too early on teardown (#11871)
[jest-transform] Improve error and warning messages (#11998)
[jest-worker] Pass execArgv correctly to worker_threads worker (#12069)

Chore & Maintenance

[docs] CLI options alphabetized (#11586)
[jest-runner] Add info regarding timers to forcedExit message(#12083)
[*] Replaced substr method with substring (#12066)
[*] Add types entry to all export maps (#12073)

New Contributors

@alexander-kilyushin made their first contribution in https://github.com/facebook/jest/pull/11988
@Josh-Cena made their first contribution in https://github.com/facebook/jest/pull/11991
@Ayc0 made their first contribution in https://github.com/facebook/jest/pull/11999
@D-Andreev made their first contribution in https://github.com/facebook/jest/pull/11992
@dcastil made their first contribution in https://github.com/facebook/jest/pull/12001
@oliversalzburg made their first contribution in https://github.com/facebook/jest/pull/12022
@Biki-das made their first contribution in https://github.com/facebook/jest/pull/12017
@dalvarezmartinez1 made their first contribution in https://github.com/facebook/jest/pull/11871
@raymondnumbergenerator made their first contribution in https://github.com/facebook/jest/pull/10818
@k-rajat19 made their first contribution in https://github.com/facebook/jest/pull/12066
@silverwind made their first contribution in https://github.com/facebook/jest/pull/12083
@Schweinepriester made their first contribution in https://github.com/facebook/jest/pull/12063
@bdefore made their first contribution in https://github.com/facebook/jest/pull/11586
@weswigham made their first contribution in https://github.com/facebook/jest/pull/12073
@iifawzi made their first contribution in https://github.com/facebook/jest/pull/12092
@tamlyn made their first contribution in https://github.com/facebook/jest/pull/11641
@kherock made their first contribution in https://github.com/facebook/jest/pull/12069
@fishmandev made their first contribution in https://github.com/facebook/jest/pull/12034

Full Changelog: https://github.com/facebook/jest/compare/v27.3.1...v27.4.0

Fixes

[*] Publish all modules to include the build change in #11569

Fixes

[jest-environment-jsdom] Bump version of JSDOM to avoid deprecated request package (#11442)

Features

[jest-environment-jsdom] [BREAKING] Upgrade jsdom to v16 (#9606)
[@jest/fake-timers] Add possibility to use a modern implementation of fake timers, backed by @sinonjs/fake-timers (#7776)
[jest-runtime] Add createMockFromModule as an alias for genMockFromModule (#9962)

Fixes

[babel-jest] Handle null being passed to createTransformer (#9955)
[jest-circus, jest-console, jest-jasmine2, jest-reporters, jest-util, pretty-format] Fix time durating formatting and consolidate time formatting code (#9765)
[jest-circus] [BREAKING] Fail tests if a test takes a done callback and have return values (#9129)
[jest-circus] [BREAKING] Throw a proper error if a test / hook is defined asynchronously (#8096)
[jest-circus] Throw more descriptive error if hook is defined inside test (#9957)
[jest-circus] [BREAKING] Align execution order of tests to match jasmine's top to bottom order (#9965)
[jest-config, jest-resolve] [BREAKING] Remove support for browser field (#9943)
[jest-haste-map] Stop reporting files as changed when they are only accessed (#7347)
[jest-resolve] Show relative path from root dir for module not found errors (#9963)
[jest-runtime] Fix absolute path moduleNameMapper + jest.mock bug (#8727)

Chore & Maintenance

[*] [BREAKING] TypeScript definitions requires a minimum of TypeScript v3.8 (#9823)
[*] [BREAKING] Drop support for Node 8 (#9423)
[*] Upgrade to chalk@4 (#9752)
[*] Remove usage of realpath-native (#9952)
[docs] Fix example reference implementation to use Jest with Phabricator (#8662)
[docs] Added default compiler to tranform (#8583)
[docs] Updated Testing Frameworks guide with React; make it generic (#9106)
[expect, jest-mock, pretty-format] [BREAKING] Remove build-es5 from package (#9945)
[@jest/fake-timers, @jest/environment] [BREAKING] Rename LolexFakeTimers to ModernFakeTimers (#9960)
[jest-haste-map] [BREAKING] removed providesModuleNodeModules (#8535)
[jest-runtime] [BREAKING] Remove long-deprecated require.requireActual and require.requireMock methods (#9854)

Features

[babel-jest] Support passing supportsDynamicImport and supportsStaticESM (#9766)
[babel-preset-jest] Enable all syntax plugins not enabled by default that works on current version of Node (#9774)
[jest-circus] Enable writing async test event handlers (#9397)
[jest-runtime, @jest/transformer] Support passing supportsDynamicImport and supportsStaticESM (#9597)

Chore & Maintenance

[*] Replace anys with unknowns (#9626)
[@jest/transform] Expose type CacheKeyOptions for getCacheKey (#9762)
[@jest/types] Correct type testRegex for ProjectConfig (#9780)

Chore & Maintenance

[*] 25.2.5 was published without changes from 25.2.4 - 25.2.6 includes all changes from that version.

Fixes

[*] Verify all packages are properly downleveled for older versions of TypeScript (#9715)

Features

[jest-config] Support ESM config files with .js extension (#9573).
[jest-runtime] Override module.createRequire to return a Jest-compatible require function (#9469)
[jest-haste-map] [BREAKING] Remove mapper option (#9581)
[*] Support array of paths for moduleNameMapper aliases (#9465)
[jest-reporters] Adds ability to pass options to the istanbul-reporter through coverageReporters (#9572)
[jest-runtime] Require stack when a module cannot be resolved (#9681)
[jest-transform] writeCacheFile no longer calls fsync (#9695)

Fixes

[expect] Handle readonly properties correctly (#9575)
[jest-cli] Set coverageProvider correctly when provided in config (#9562)
[jest-cli] Allow specifying .cjs and .mjs config files by --config CLI option (#9578)
[jest-cli] Update yargs to fix CLI flag overriding (#9519)
[jest-config] Treat setupFilesAfterEnv like setupFiles when normalizing configs against presets (#9495)
[jest-config] Support .mjs config files on Windows as well (#9558)
[jest-config] Verify rootDir and all roots are directories (#9569)
[jest-config] Ensure pattern of replacePosixSep is a string (#9546)
[jest-haste-map] Fix crash on unix based systems without find (#9579)
[jest-jasmine2] Fix --testNamePattern matching with concurrent tests (#9090)
[jest-matcher-utils] Fix diff highlight of symbol-keyed object. (#9499)
[@jest/reporters] Notifications should be fire&forget rather than having a timeout (#9567)
[jest-resolve] Fix module identity preservation with symlinks and browser field resolution (#9511)
[jest-resolve] Do not confuse directories with files (#8912)
[jest-resolve] moduleNameMapper should take precedence over Node core modules (#9563)
[jest-runtime] Reset isolateModules if it fails (#9541)
[jest-runtime] Yarn PnP errors displayed to the user (#9681)
[jest-snapshot] Downgrade semver to v6 to support node 8 (#9451)
[jest-snapshot] Properly indent new snapshots in the presences of existing ones (#9523)
[jest-transform] Correct sourcemap behavior for transformed and instrumented code (#9460)
[jest-transform] Allow instrumentation of transformed files with weird file extensions (#9589)
[@jest/types] Make ConfigGlobals an interface to allow for declaration merging. (#9570)
[pretty-format] Export OldPlugin type (#9491)

Chore & Maintenance

[docs] Warn about unexpected behavior / bug of node-notifier when using the notify options.
[docs] Grammatical corrections to Async docs page. (#9679)
[jest-resolver] Use resolve package to implement custom module resolution (#9520)
[jest-runtime] Move execution of setupFiles to jest-runner (#9596)
[jest-runtime] Update anchor link in helpers (#9616)
[@jest/reporters] Remove unused dependencies and type exports (#9462)
[website] Update pictures of reports when matchers fail (#9214)

Performance

[jest-haste-map] Reduce number of lstat calls in node crawler (#9514)

Features

[babel-plugin-jest-hoist] Show codeframe on static hoisting issues (#8865)
[babel-plugin-jest-hoist] Add BigInt to ALLOWED_IDENTIFIERS (#8382)
[babel-preset-jest] Add @babel/plugin-syntax-bigint (#8382)
[expect] Add BigInt support to toBeGreaterThan, toBeGreaterThanOrEqual, toBeLessThan and toBeLessThanOrEqual (#8382)
[expect, jest-matcher-utils] Display change counts in annotation lines (#9035)
[expect, jest-snapshot] Support custom inline snapshot matchers (#9278)
[jest-config] Throw the full error message and stack when a Jest preset is missing a dependency (#8924)
[jest-config] [BREAKING] Set default display name color based on runner (#8689)
[jest-config] Merge preset globals with project globals (#9027)
[jest-config] Support .cjs config files (#9291)
[jest-config] [BREAKING] Support .mjs config files (#9431)
[jest-core] Support reporters as default exports (#9161)
[jest-core] Support --findRelatedTests paths case insensitivity on Windows (#8900)
[jest-diff] Add options for colors and symbols (#8841)
[jest-diff] [BREAKING] Export as ECMAScript module (#8873)
[jest-diff] Add includeChangeCounts and rename Indicator options (#8881)
[jest-diff] Add changeColor and patchColor options (#8911)
[jest-diff] Add trailingSpaceFormatter option and replace cyan with commonColor (#8927)
[jest-diff] Add firstOrLastEmptyLineReplacement option and export 3 diffLines functions (#8955)
[jest-environment] Add optional getVmContext next to runScript (#9252 & #9428)
[jest-environment-jsdom] Add fakeTimersLolex (#8925)
[jest-environment-node] Add fakeTimersLolex (#8925)
[jest-environment-node] Add queueMicrotask (#9140)
[jest-environment-node] Implement getVmContext (#9252 & #9428)
[@jest/fake-timers] Add Lolex as implementation of fake timers (#8897)
[jest-get-type] Add BigInt support. (#8382)
[jest-matcher-utils] Add BigInt support to ensureNumbers ensureActualIsNumber, ensureExpectedIsNumber (#8382)
[jest-matcher-utils] Ignore highlighting matched asymmetricMatcher in diffs (#9257)
[jest-reporters] Export utils for path formatting (#9162)
[jest-reporters] Provides global coverage thresholds as watermarks for istanbul (#9416)
[jest-runner] Warn if a worker had to be force exited (#8206)
[jest-runtime] [BREAKING] Do not export ScriptTransformer - it can be imported from @jest/transform instead (#9256)
[jest-runtime] Use JestEnvironment.getVmContext and vm.compileFunction if available to avoid the module wrapper (#9252 & #9428)
[jest-snapshot] Display change counts in annotation lines (#8982)
[jest-snapshot] [BREAKING] Improve report when the matcher has properties (#9104)
[jest-snapshot] Improve colors when snapshots are updatable (#9132)
[jest-snapshot] Ignore indentation for most serialized objects (#9203)
[jest-transform] Create createTranspilingRequire function for easy transpiling modules (#9194)
[jest-transform] [BREAKING] Return transformed code as a string, do not wrap in vm.Script (#9253)
[@jest/test-result] Create method to create empty TestResult (#8867)
[jest-worker] [BREAKING] Return a promise from end(), resolving with the information whether workers exited gracefully (#8206)
[jest-reporters] Transform file paths into hyperlinks (#8980)

Fixes

[expect] Display expectedDiff more carefully in toBeCloseTo (#8389)
[expect] Avoid incorrect difference for subset when toMatchObject fails (#9005)
[expect] Consider all RegExp flags for equality (#9167)
[expect] [BREAKING] Consider primitives different from wrappers instantiated with new (#9167)
[expect] Prevent maintaining RegExp state between multiple tests (#9289)
[expect] Fix subsetEquality false circular reference detection (#9322)
[jest-config] Use half of the available cores when watchAll mode is enabled (#9117)
[jest-config] Fix Jest multi project runner still cannot handle exactly one project (#8894)
[jest-console] Add missing console.group calls to NullConsole (#9024)
[jest-core] Don't include unref'd timers in --detectOpenHandles results (#8941)
[jest-core] Limit number of workers when creating haste maps in projects (#9259)
[jest-diff] Do not inverse format if line consists of one change (#8903)
[jest-diff] Rename some new options and change their default values (#9077)
[jest-environment-node] Fix TextEncoder.encode not referencing same global Uint8Array constructor (#9261)
[jest-fake-timers] getTimerCount will not include cancelled immediates (#8764)
[jest-fake-timers] Support util.promisify on setTimeout (#9180)
[jest-jasmine2, jest-circus] Improve error message format for Node's assert.fail (#9262)
[jest-leak-detector] [BREAKING] Use weak-napi instead of weak package (#8686)
[jest-mock] Fix for mockReturnValue overriding mockImplementationOnce (#8398)
[jest-reporters] Make node-notifier an optional dependency (#8918)
[jest-reporters] Make all arguments to methods on BaseReporter optional (#9159)
[jest-resolve]: Set MODULE_NOT_FOUND as error code when module is not resolved from paths (#8487)
[jest-resolve-dependencies] Handle dynamic dependencies correctly even when using module maps (#9303)
[jest-snapshot] Remove only the added newlines in multiline snapshots (#8859)
[jest-snapshot] Distinguish empty string from external snapshot not written (#8880)
[jest-snapshot] [BREAKING] Distinguish empty string from internal snapshot not written (#8898)
[jest-snapshot] [BREAKING] Remove report method and throw matcher errors (#9049)
[jest-snapshot] Omit irrelevant received properties when property matchers fail (#9198)
[jest-transform] Properly cache transformed files across tests (#8890)
[jest-transform] Don't fail the test suite when a generated source map is invalid (#9058)
[jest-types] [BREAKING] Use less null | undefined in config types (#9200)
[jest-util] Allow querying process.domain (#9136)
[pretty-format] Correctly detect memoized elements (#9196)
[pretty-format] Fix pretty-format to respect displayName on forwardRef (#9422)

Chore & Maintenance

[*] [BREAKING] Drop support for Node 6 (#8455)
[*] Add Node 12 to CI (#8411)
[*] [BREAKING] Upgrade to Micromatch v4 (#8852)
[babel-plugin-jest-hoist] [BREAKING] Use ESM exports (#8874)
[docs] Add alias and optional boolean value to coverage CLI Reference (#8996)
[docs] Fix broken link pointing to legacy JS file in "Snapshot Testing".
[docs] Add setupFilesAfterEnv and jest.setTimeout example (#8971)
[expect] Test that toStrictEqual is equivalent to Node's assert.deepStrictEqual (#9167)
[jest] [BREAKING] Use ESM exports (#8874)
[jest-cli] [BREAKING] Use ESM exports (#8874)
[jest-cli] [BREAKING] Remove re-exports from @jest/core (#8874)
[jest-diff] Remove the need to export splitLines0 function (#9151)
[jest-environment-jsdom] [BREAKING] Upgrade JSDOM from v11 to v15 (#8851)
[jest-haste-map] Upgrade to fsevents@2 (#9215)
[jest-reporters] [BREAKING] Upgrade Istanbul dependencies, which are used for code coverage (#9192)
[jest-util] [BREAKING] Remove deprecated exports (#8863)
[jest-validate] [BREAKING] Use ESM exports (#8874)
[jest-types] Mark InitialOptions as Partial (#8848)
[jest-config] Refactor normalize to be more type safe (#8848)

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 (#8448)
[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 useage with --notify on macOS (#8830)

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 (#7985)
[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, #7809)

Performance

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

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]https://github.com/facebook/jest/pull/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)

Features

[jest-each] Add support for keyPaths in test titles (#6457)
[jest-cli] Add jest --init option that generates a basic configuration file with a short description for each option (#6442)
[jest.retryTimes] Add jest.retryTimes() option that allows failed tests to be retried n-times when using jest-circus. (#6498)

Fixes

[docs] Fixed error in documentation for expect.not.arrayContaining(array). (#6491)
[jest-cli] Add check to make sure one or more tests have run before notifying when using --notify (#6495)
[jest-cli] Pass globalConfig as a parameter to globalSetup and globalTeardown functions (#6486)
[jest-config] Add missing options to the defaults object (#6428)
[expect] Using symbolic property names in arrays no longer causes the toEqual matcher to fail (#6391)
[expect] toEqual no longer tries to compare non-enumerable symbolic properties, to be consistent with non-symbolic properties. (#6398)
[jest-util] console.timeEnd now properly log elapsed time in milliseconds. (#6456)
[jest-mock] Fix MockNativeMethods access in react-native jest.mock() (#6505)
[jest-cli] Fix reporters for moduleName = 'default' (#6542)

Chore & Maintenance

[docs] Add jest-each docs for 1 dimensional arrays (#6444)

Chore & Maintenance

[jest-jasemine2] Add dependency on jest-each (#6308)
[jest-each] Move jest-each into core Jest (#6278)
[examples] Update typescript example to using ts-jest (#6260)

Fixes

[pretty-format] Serialize inverse asymmetric matchers correctly (#6272)

Fixes

[jest-haste-map] Overhauls how Watchman crawler works fixing Windows (#5615)
[expect] Allow matching of Errors against plain objects (#5611)
[jest-haste-map] Do not read binary files in Haste, even when instructed to do so (#5612)
[jest-cli] Don't skip matchers for exact files (#5582)
[docs] Update discord links (#5586)
[jest-runtime] Align handling of testRegex on Windows between searching for tests and instrumentation checks (#5560)
[jest-config] Make it possible to merge transform option with preset (#5505)
[jest-util] Fix console.assert behavior in custom & buffered consoles (#5576)

Features

[docs] Add MongoDB guide (#5571)
[jest-runtime] Deprecate mapCoverage option. (#5177)
[babel-jest] Add option to return sourcemap from the transformer separately from source. (#5177)
[jest-validate] Add ability to log deprecation warnings for CLI flags. (#5536)
[jest-serializer] Added new module for serializing. Works using V8 or JSON (#5609)
[docs] Add a documentation note for project displayName configuration (#5600)

Chore & Maintenance

[docs] Update automatic mocks documentation (#5630)

Fixes

[babel-jest] Revert "Remove retainLines from babel-jest" (#5496)
[jest-docblock] Support multiple of the same @pragma. (#5154)

Features

[jest-worker] Assign a unique id for each worker and pass it to the child process. It will be available via process.env.JEST_WORKER_ID (#5494)

Chore & Maintenance

[filenames] Standardize file names in root (#5500)

Features

[jest-runner] Move test summary to after coverage report (#4512)
[jest-cli] Added --notifyMode to specify when to be notified. (#5125)
[diff-sequences] New package compares items in two sequences to find a longest common subsequence. (#5407)
[jest-matcher-utils] Add comment option to matcherHint function (#5437)
[jest-config] Allow lastComit and changedFilesWithAncestor via JSON config (#5476)
[jest-util] Add deletion to process.env as well (#5466)
[jest-util] Add case-insensitive getters/setters to process.env (#5465)
[jest-mock] Add util methods to create async functions. (#5318)

Fixes

[jest-cli] Add trailing slash when checking root folder (#5464)
[jest-cli] Hide interactive mode if there are no failed snapshot tests (#5450)
[babel-jest] Remove retainLines from babel-jest (#5439)
[jest-cli] Glob patterns ignore non-require-able files (e.g. README.md) (#5199)
[jest-mock] Add backticks support (``) to mock a certain package via the __mocks__ folder. (#5426)
[jest-message-util] Prevent an ENOENT crash when the test file contained a malformed source-map. (#5405).
[jest] Add import-local to jest package. (#5353)
[expect] Support class instances in .toHaveProperty() and .toMatchObject matcher. (#5367)
[jest-cli] Fix npm update command for snapshot summary. (#5376, 5389)
[expect] Make rejects and resolves synchronously validate its argument. (#5364)
[docs] Add tutorial page for ES6 class mocks. (#5383)
[jest-resolve] Search required modules in node_modules and then in custom paths. (#5403)
[jest-resolve] Get builtin modules from node core. (#5411)
[jest-resolve] Detect and preserve absolute paths in moduleDirectories. Do not generate additional (invalid) paths by prepending each ancestor of cwd to the absolute path. Additionally, this fixes functionality in Windows OS. (#5398)

Chore & Maintenance

[jest-util] Implement watch plugins (#5399)

Features

[jest-cli] Make Jest exit without an error when no tests are found in the case of --lastCommit, --findRelatedTests, or --onlyChanged options having been passed to the CLI
[jest-cli] Add interactive snapshot mode (#3831)

Fixes

[jest-cli] Use import-local to support global Jest installations. (#5304)
[jest-runner] Fix memory leak in coverage reporting (#5289)
[docs] Update mention of the minimal version of node supported (#4947)
[jest-cli] Fix missing newline in console message (#5308)
[jest-cli] --lastCommit and --changedFilesWithAncestor now take effect even when --onlyChanged is not specified. (#5307)

Chore & Maintenance

[filenames] Standardize folder names under integration-tests/ (#5298)

Chore & Maintenance

[*] Tweaks to better support Node 4 (#5134)

Fixes

[jest-runtime] fix error for test files providing coverage. (#5117)

Features

[jest-config] Add forceCoverageMatch to allow collecting coverage from ignored files. (#5081)

Fixes

[jest-resolve] Use module.builtinModules as BUILTIN_MODULES when it exists
[jest-worker] Remove debug and inspect flags from the arguments sent to the child (#5068)
[jest-config] Use all --testPathPattern and <regexForTestFiles> args in testPathPattern (#5066)
[jest-cli] Do not support --watch inside non-version-controlled environments (#5060)
[jest-config] Escape Windows path separator in testPathPattern CLI arguments (#5054)
[jest-jasmine] Register sourcemaps as node environment to improve performance with jsdom (#5045)
[pretty-format] Do not call toJSON recursively (#5044)
[pretty-format] Fix errors when identity-obj-proxy mocks CSS Modules (#4935)
[babel-jest] Fix support for namespaced babel version 7 (#4918)
[expect] fix .toThrow for promises (#4884)
[jest-docblock] pragmas should preserve urls (#4837)
[jest-cli] Check if npm_lifecycle_script calls Jest directly (#4629)
[jest-cli] Fix --showConfig to show all configs (#4494)
[jest-cli] Throw if maxWorkers doesn't have a value (#4591)
[jest-cli] Use fs.realpathSync.native if available (#5031)
[jest-config] Fix --passWithNoTests (#4639)
[jest-config] Support rootDir tag in testEnvironment (#4579)
[jest-editor-support] Fix --showConfig to support jest 20 and jest 21 (#4575)
[jest-editor-support] Fix editor support test for node 4 (#4640)
[jest-mock] Support mocking constructor in mockImplementationOnce (#4599)
[jest-runtime] Fix manual user mocks not working with custom resolver (#4489)
[jest-util] Fix runOnlyPendingTimers for setTimeout inside setImmediate (#4608)
[jest-message-util] Always remove node internals from stacktraces (#4695)
[jest-resolve] changes method of determining builtin modules to include missing builtins (#4740)
[pretty-format] Prevent error in pretty-format for window in jsdom test env (#4750)
[jest-resolve] Preserve module identity for symlinks (#4761)
[jest-config] Include error message for preset json (#4766)
[pretty-format] Throw PrettyFormatPluginError if a plugin halts with an exception (#4787)
[expect] Keep the stack trace unchanged when PrettyFormatPluginError is thrown by pretty-format (#4787)
[jest-environment-jsdom] Fix asynchronous test will fail due to timeout issue. (#4669)
[jest-cli] Fix --onlyChanged path case sensitivity on Windows platform (#4730)
[jest-runtime] Use realpath to match transformers (#5000)
[expect] [BREAKING] Replace identity equality with Object.is in toBe matcher (#4917)

Features

[jest-message-util] Add codeframe to test assertion failures (#5087)
[jest-config] Add Global Setup/Teardown options (#4716)
[jest-config] Add testEnvironmentOptions to apply to jsdom options or node context. (#5003)
[jest-jasmine2] Update Timeout error message to jest.timeout and display current timeout value (#4990)
[jest-runner] Enable experimental detection of leaked contexts (#4895)
[jest-cli] Add combined coverage threshold for directories. (#4885)
[jest-mock] Add timestamps to mock state. (#4866)
[eslint-plugin-jest] Add prefer-to-have-length lint rule. (#4771)
[jest-environment-jsdom] [BREAKING] Upgrade to JSDOM@11 (#4770)
[jest-environment-*] [BREAKING] Add Async Test Environment APIs, dispose is now teardown (#4506)
[jest-cli] Add an option to clear the cache (#4430)
[babel-plugin-jest-hoist] Improve error message, that the second argument of jest.mock must be an inline function (#4593)
[jest-snapshot] [BREAKING] Concatenate name of test and snapshot (#4460)
[jest-cli] [BREAKING] Fail if no tests are found (#3672)
[jest-diff] Highlight only last of odd length leading spaces (#4558)
[jest-docblock] Add docblock.print() (#4517)
[jest-docblock] Add strip (#4571)
[jest-docblock] Preserve leading whitespace in docblock comments (#4576)
[jest-docblock] remove leading newlines from parswWithComments().comments (#4610)
[jest-editor-support] Add Snapshots metadata (#4570)
[jest-editor-support] Adds an 'any' to the typedef for updateFileWithJestStatus (#4636)
[jest-editor-support] Better monorepo support (#4572)
[jest-environment-jsdom] Add simple rAF polyfill in jsdom environment to work with React 16 (#4568)
[jest-environment-node] Implement node Timer api (#4622)
[jest-jasmine2] Add testPath to reporter callbacks (#4594)
[jest-mock] Added support for naming mocked functions with .mockName(value) and .mockGetName() (#4586)
[jest-runtime] Add module.loaded, and make module.require not enumerable (#4623)
[jest-runtime] Add module.parent (#4614)
[jest-runtime] Support sourcemaps in transformers (#3458)
[jest-snapshot] [BREAKING] Add a serializer for jest.fn to allow a snapshot of a jest mock (#4668)
[jest-worker] Initial version of parallel worker abstraction, say hello! (#4497)
[jest-jasmine2] Add testLocationInResults flag to add location information per spec to test results (#4782)
[jest-environment-jsdom] Update JSOM to 11.4, which includes built-in support for requestAnimationFrame (#4919)
[jest-cli] Hide watch usage output when running on non-interactive environments (#4958)
[jest-snapshot] Promises support for toThrowErrorMatchingSnapshot (#4946)
[jest-cli] Explain which snapshots are obsolete (#5005)

Chore & Maintenance

[docs] Add guide of using with puppeteer (#5093)
[jest-util] jest-util should not depend on jest-mock (#4992)
[*] [BREAKING] Drop support for Node.js version 4 (#4769)
[docs] Wrap code comments at 80 characters (#4781)
[eslint-plugin-jest] Removed from the Jest core repo, and moved to https://github.com/jest-community/eslint-plugin-jest (#4867)
[babel-jest] Explicitly bump istanbul to newer versions (#4616)
[expect] Upgrade mocha and rollup for browser testing (#4642)
[docs] Add info about coveragePathIgnorePatterns (#4602)
[docs] Add Vuejs series of testing with Jest (#4648)
[docs] Mention about optional done argument in test function (#4556)
[jest-cli] Bump node-notifier version (#4609)
[jest-diff] Simplify highlight for leading and trailing spaces (#4553)
[jest-get-type] Add support for date (#4621)
[jest-matcher-utils] Call chalk.inverse for trailing spaces (#4578)
[jest-runtime] Add .advanceTimersByTime; keep .runTimersToTime() as an alias.
[docs] Include missing dependency in TestEnvironment sample code
[docs] Add clarification for hook execution order
[docs] Update expect.anything() sample code (#5007)

🃏 Change license from BSD+Patents to MIT.
Allow eslint-plugin to recognize more disabled tests (#4533)
Add babel-plugin for object spread syntax to babel-preset-jest (#4519)
Display outer element and trailing newline consistently in jest-diff (#4520)
Do not modify stack trace of JestAssertionError (#4516)
Print errors after test structure in verbose mode (#4504)
Fix --silent --verbose problem (#4505)
Fix: Reset local state of assertions when using hasAssertions (#4498)
jest-resolve: Prevent default resolver failure when potential resolution directory does not exist (#4483)

(minor) Use ES module exports (#4454)
Allow chaining mockClear and mockReset (#4475)
Call jest-diff and pretty-format more precisely in toHaveProperty matcher (#4445)
Expose restoreAllMocks to object (#4463)
Fix function name cleaning when making mock fn (#4464)
Fix Map/Set equality checker (#4404)
Make FUNCTION_NAME_RESERVED_PATTERN stateless (#4466)

Take precedence of NODE_PATH when resolving node_modules directories (#4453)
Fix race condition with --coverage and babel-jest identical file contents edge case (#4432)
Add extra parameter --runTestsByPath. (#4411)
Upgrade all outdated deps (#4425)

Add --changedFilesWithAncestor (#4070)
Add --findRelatedFiles (#4131)
Add --onlyChanged tests (#3977)
Add contextLines option to jest-diff (#4152)
Add alternative serialize API for pretty-format plugins (#4114)
Add displayName to MPR (#4327)
Add displayName to TestResult (#4408)
Add es5 build of pretty-format (#4075)
Add extra info to no tests for changed files message (#4188)
Add fake chalk in browser builds in order to support IE10 (#4367)
Add jest.requireActual (#4260)
Add maxWorkers to globalConfig (#4005)
Add skipped tests support for jest-editor-support (#4346)
Add source map support for better debugging experience (#3738)
Add support for Error objects in toMatchObject (#4339)
Add support for Immutable.Record in pretty-format (#3678)
Add tests for extract_requires on export types (#4080)
Add that toMatchObject can match arrays (#3994)
Add watchPathIgnorePatterns to exclude paths to trigger test re-run in watch mode (#4331)
Adding ancestorTitles property to JSON test output (#4293)
Allow custom resolver to be used with[out] moduleNameMapper (#4174)
Avoid parsing .require(…) method calls (#3777)
Avoid unnecessary function declarations and call in pretty-format (#3962)
Avoid writing to stdout in default reporter if --json is enabled. Fixes #3941 (#3945)
Better error handling for --config (#4230)
Call consistent pretty-format plugins within Jest (#3800)
Change babel-core to peerDependency for compatibility with Babel 7 (#4162)
Change Promise detection code in jest-circus to support non-global Promise implementations (#4375)
Changed files eager loading (#3979)
Check whether we should output to stdout or stderr (#3953)
Clarify what objects toContain and toContainEqual can be used on (#4307)
Clean up resolve() logic. Provide useful names for variables and functions. Test that a directory exists before attempting to resolve files within it. (#4325)
cleanupStackTrace (#3696)
compare objects with Symbol keys (#3437)
Complain if expect is passed multiple arguments (#4237)
Completes nodeCrawl with empty roots (#3776)
Consistent naming of files (#3798)
Convert code base to ESM import (#3778)
Correct summary message for flag --findRelatedTests. (#4309)
Coverage thresholds can be set up for individual files (#4185)
custom reporter error handling (#4051)
Define separate type for pretty-format plugin Options (#3802)
Delete confusing async keyword (#3679)
Delete redundant branch in ReactElement and HTMLElement plugins (#3731)
Don't format node assert errors when there's no 'assert' module (#4376)
Don't print test summary in --silent (#4106)
Don't try to build ghost packages (#3934)
Escape double quotes in attribute values in HTMLElement plugin (#3797)
Explain how to clear the cache (#4232)
Factor out common code for collections in pretty-format (#4184)
Factor out common code for markup in React plugins (#4171)
Feature/internal resolve (#4315)
Fix --logHeapUsage (#4176)
Fix --showConfig to show all project configs (#4078)
Fix --watchAll (#4254)
Fix bug when setTimeout is mocked (#3769)
Fix changedFilesWithAncestor (#4193)
Fix colors for expected/stored snapshot message (#3702)
Fix concurrent test failure (#4159)
Fix for 4286: Compare Maps and Sets by value rather than order (#4303)
fix forceExit (#4105)
Fix grammar in React Native docs (#3838)
Fix inconsistent name of complex values in pretty-format (#4001)
Fix issue mocking bound method (#3805)
Fix jest-circus (#4290)
Fix lint warning in master

(#4132)
Fix linting (#3946)
fix merge conflict (#4144)
Fix minor typo (#3729)
fix missing console.log messages (#3895)
fix mock return value (#3933)
Fix mocking for modules with folders on windows (#4238)
Fix NODE_PATH resolving for relative paths (#3616)
Fix options.moduleNameMapper override order with preset (#3565 (#3689)
Fix React PropTypes warning in tests for Immutable plugin (#4412)
Fix regression in mockReturnValueOnce (#3857)
Fix sample code of mock class constructors (#4115)
Fix setup-test-framework-test (#3773)
fix typescript jest test crash (#4363)
Fix watch mode (#4084)
Fix Watchman on windows (#4018)
Fix(babel): Handle ignored files in babel v7 (#4393)
Fix(babel): Support upcoming beta (#4403)
Fixed object matcher (#3799)
Fixes #3820 use extractExpectedAssertionsErrors in jasmine setup
Flow upgrade (#4355)
Force message in matchers to always be a function (#3972)
Format describe and use test instead of it alias (#3792)
global_config.js for multi-project runner (#4023)
Handle async errors (#4016)
Hard-fail if hasteImpl is throwing an error during initialization. (#3812)
Ignore import type for extract_requires (#4079)
Ignore indentation of data structures in jest-diff (#3429)
Implement 'jest.requireMock' (#4292)
Improve Jest phabricator plugin (#4195)
Improve Seq and remove newline from non-min empty in Immutable plugin (#4241)
Improved the jest reporter with snapshot info per test. (#3660)
Include fullName in formattedAssertion (#4273)
Integrated with Yarn workspaces (#3906)
jest --all (#4020)
jest-circus test failures (#3770)
jest-circus Timeouts (#3760)
jest-haste-map: add test case for broken handling of ignore pattern (#4047)
jest-haste-map: add test+fix for broken platform module support (#3885)
jest-haste-map: deprecate functional ignorePattern and use it in cache key (#4063)
jest-haste-map: mock 'fs' with more idiomatic jest.mock() (#4046)
jest-haste-map: only file IO errors should be silently ignored (#3816)
jest-haste-map: throw when trying to get a duplicated module (#3976)
jest-haste-map: watchman crawler: normalize paths (#3887)
jest-runtime: atomic cache write, and check validity of data (#4088)
Join lines with newline in jest-diff (#4314)
Keep ARGV only in CLI files (#4012)
let transformers adjust cache key based on mapCoverage (#4187)
Lift requires (#3780)
Log stack when reporting errors in jest-runtime (#3833)
Make --listTests return a new line separated list when not using --json (#4229)
Make build script printing small-terminals-friendly (#3892)
Make error messages more explicit for toBeCalledWith assertions (#3913)
Make jest-matcher-utils use ESM exports (#4342)
Make jest-runner a standalone package. (#4236)
Make Jest’s Test Runner configurable. (#4240)
Make listTests always print to console.log (#4391)
Make providesModuleNodeModules ignore nested node_modules directories
Make sure function mocks match original arity (#4170)
Make sure runAllTimers also clears all ticks (#3915)
Make toBe matcher error message more helpful for objects and arrays (#4277)
Make useRealTimers play well with timers: fake (#3858)
Move getType from jest-matcher-utils to separate package (#3559)
Multiroot jest-change-files (#3969)
Output created snapshot when using --ci option (#3693)
Point out you can use matchers in .toMatchObject (#3796)
Prevent babelrc package import failure on relative current path (#3723)
Print RDP details for windows builds (#4017)
Provide better error checking for transformed content (#3807)
Provide printText and printComment in markup.js for HTMLElement plugin (#4344)
Provide regex visualization for testRegex (#3758)
Refactor CLI (#3862)
Refactor names and delimiters of complex values in pretty-format (#3986)
Replace concat(Immutable) with Immutable as item of plugins array (#4207)
Replace Jasmine with jest-circus (#3668)
Replace match with test and omit redundant String conversion (#4311)
Replace print with serialize in AsymmetricMatcher plugin (#4173)
Replace print with serialize in ConvertAnsi plugin (#4225)
Replace print with serialize in HTMLElement plugin (#4215)
Replace print with serialize in Immutable plugins (#4189)
Replace unchanging args with one config arg within pretty-format (#4076)
Return UNDEFINED for undefined type in ReactElement plugin (#4360)
Rewrite some read bumps in pretty-format (#4093)
Run update method before installing JRE on Circle (#4318)
Separated the snapshot summary creation from the printing to improve testability. (#4373)
Set coverageDirectory during normalize phase (#3966)
Setup custom reporters after default reporters (#4053)
Setup for Circle 2 (#4149)
Simplify readme (#3790)
Simplify snapshots definition (#3791)
skipNodeResolution config option (#3987)
Small fixes to toHaveProperty docs (#3878)
Sort attributes by name in HTMLElement plugin (#3783)
Specify watchPathIgnorePatterns will only be available in Jest 21+ (#4398)
Split TestRunner off of TestScheduler (#4233)
Strict and explicit config resolution logic (#4122)
Support maxDepth option in React plugins (#4208)
Support SVG elements in HTMLElement plugin (#4335)
Test empty Immutable collections with {min: false} option (#4121)
test to debug travis failure in master (#4145)
testPathPattern message test (#4006)
Throw Error When Using Nested It Specs (#4039)
Throw when moduleNameMapper points to inexistent module (#3567)
Unified 'no tests found' message for non-verbose MPR (#4354)
Update migration guide with jest-codemods transformers (#4306)
Use "inputSourceMap" for coverage re-mapping. (#4009)
Use "verbose" no test found message when there is only one project (#4378)
Use babel transform to inline all requires (#4340)
Use eslint plugins to run prettier (#3971)
Use iterableEquality in spy matchers (#3651)
Use modern HTML5 <!DOCTYPE> (#3937)
Wrap Error.captureStackTrace in a try (#4035)

Fix reporters 'default' setting. (#3562)
Fix to make Jest fail when the coverage threshold not met. (#3554)

Add ansi-regex to pretty-format dependencies (#3498)
Fix replacement in testMatch and moduleDirectories (#3538)
Fix expect.hasAssertions() to throw when passed arguments (#3526)
Fix stack traces without proper error messages (#3513)
Fix support for custom extensions through haste packages (#3537)
Fix test contexts between test functions (#3506)

New --projects option to run one instance of Jest in multiple projects at the same time. (#3400)
New multi project runner (#3156)
New --listTests flag. (#3441)
New --showConfig flag. (#3296)
New promise support for all expect matchers through .resolves and .rejects. (#3068)
New expect.hasAssertions() function similar to expect.assertions(). (#3379)
New this.equals function exposed to custom matchers. (#3469)
New valid-expect lint rule in eslint-plugin-jest. (#3067)
New HtmlElement pretty-format plugin. (#3230)
New Immutable pretty-format plugins. (#2899)
New test environment per file setting through @jest-environment in the docblock. (#2859)
New feature that allows every configuration option to be set from the command line. (#3424)
New feature to add custom reporters to Jest through reporters in the configuration. (#3349)
New feature to add expected and actual values to AssertionError. (#3217)
New feature to map code coverage from transformers. (#2290)
New feature to run untested code coverage in parallel. (#3407)
New option to define a custom resolver. (#2998)
New printing support for text and comment nodes in html pretty-format. (#3355)
New snapshot testing FAQ (#3425)
New support for custom platforms on jest-haste-map. (#3162)
New support for mocking native async methods. (#3209)
New guide on how to use Jest with any JavaScript framework. (#3243)
New translation system for the Jest website.
New collapsing watch mode usage prompt after first run. (#3078)
Breaking Change: Forked Jasmine 2.5 into Jest's own test runner and rewrote large parts of Jasmine. (#3147)
Breaking Change: Jest does not write new snapshots by default on CI. (#3456)
Breaking Change: Moved the typescript parser from jest-editor-support into a separate jest-test-typescript-parser package. (#2973)
Breaking Change: Replaced auto-loading of babel-polyfill with only regenerator-runtime, fixes a major memory leak. (#2755)
Fixed babel-jest to look up the babel field in package.json as a fallback.
Fixed jest-editor-support's parser to not crash on incomplete ASTs. (#3259)
Fixed jest-resolve to use is-builtin-module instead of resolve.isCore. (#2997)
Fixed jest-snapshot to normalize line endings in the serialize function. (#3002)
Fixed behavior of --silent flag. (#3003)
Fixed bug with watchers on macOS causing test to crash. (#2957)
Fixed CLI notify option not taking precedence over config option. (#3340)
Fixed detection of the npm client in SummaryReporter to support Yarn. (#3263)
Fixed done.fail not passing arguments (#3241)
Fixed fake timers to restore after resetting mocks. (#2467)
Fixed handling of babylon's parser options in jest-editor-support. (#3344)
Fixed Jest to properly cache transform results. (#3334)
Fixed Jest to use human-readable colors for Jest's own snapshots. (#3119)
Fixed jest-config to use UID for default cache folder. (#3380), (#3387)
Fixed jest-runtime to expose inner error when it fails to write to the cache. (#3373)
Fixed lifecycle hooks to make afterAll hooks operate the same as afterEach. (#3275)
Fixed pretty-format to run plugins before serializing nested basic values. (#3017)
Fixed return value of mocks so they can explicitly be set to return undefined. (#3354)
Fixed runner to run tests associated with snapshots when the snapshot changes. (#3025)
Fixed snapshot serializer require, restructured pretty-format. (#3399)
Fixed support for Babel 7 in babel-jest. (#3271)
Fixed testMatch to find tests in .folders. (#3006)
Fixed testNamePattern and testPathPattern to work better together. (#3327)
Fixed to show reject reason when expecting resolve. (#3134)
Fixed toHaveProperty() to use hasOwnProperty from Object (#3410)
Fixed watch mode's screen clearing. (#2959) (#3294)
Improved and consolidated Jest's configuration file resolution. (#3472)
Improved documentation throughout the Jest website.
Improved documentation to explicitly mention that snapshots must be reviewed. (#3203)
Improved documentation to make it clear CRA users don't need to add dependencies. (#3312)
Improved eslint-plugin-jest's handling of expect. (#3306)
Improved flow-coverage, eslint rules and test coverage within the Jest repository.
Improved printing of expect.assertions error. (#3033)
Improved Windows test coverage of Jest.
Refactored configs & transform (#3376)
Refactored reporters to pass individual Tests to reporters. (#3289)
Refactored TestRunner (#3166)
Refactored watch mode prompts. (#3290)
Deleted jest-file-exists. (#3105)
Removed Config type. (#3366)
Removed all usage of jest-file-exists. (#3101)
Adopted prettier on the Jest codebase.

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