v27.3.1

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Fixes

• [expect] Make expect extension properties configurable (#​11978)
• [expect] Fix .any() checks on primitive wrapper classes (#​11976)

Chore & Maintenance

• [expect] BigInt global is always defined, don't check for its existence at runtime (#​11979)
• [jest-config, jest-util] Use ci-info instead of is-ci to detect CI environment (#​11973)

v27.3.0

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Features

• [jest-config] Add testEnvironmentOptions.html to apply to jsdom input (#​11950)
• [jest-resolver] Support default export (.) in exports field if main is missing (#​11919)

Fixes

• [expect] Tweak and improve types (#​11949)
• [jest-runtime] Ensure absolute paths can be resolved within test modules (#​11943)
• [jest-runtime] Fix instanceof for ModernFakeTimers and LegacyFakeTimers methods (#​11946)

v27.2.5

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Features

• [jest-config] Warn when multiple Jest configs are located (#​11922)

Fixes

• [expect] Pass matcher context to asymmetric matchers (#​11926 & #​11930)
• [expect] Improve TypeScript types (#​11931)
• [expect] Improve typings of toThrow() and toThrowError() matchers (#​11929)
• [jest-cli] Improve --help printout by removing defunct --browser option (#​11914)
• [jest-haste-map] Use distinct cache paths for different values of computeDependencies (#​11916)
• [@jest/reporters] Do not buffer console.logs when using verbose reporter (#​11054)

Chore & Maintenance

• [expect] Export default matchers (#​11932)
• [@jest/types] Mark deprecated configuration options as @deprecated (#​11913)

v27.2.4

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Features

• [expect] Add equality checks for Array Buffers in expect.ToStrictEqual() (#​11805)

Fixes

• [jest-snapshot] Correctly indent inline snapshots (#​11560)

v27.2.3

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Features

• [@jest/fake-timers] Update @sinonjs/fake-timers to v8 (#​11879)

Fixes

• [jest-config] Parse testEnvironmentOptions if received from CLI (#​11902)
• [jest-reporters] Call destroy on v8-to-istanbul converters to free memory (#​11896)

v27.2.2

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Fixes

• [jest-runtime] Correct wrapperLength value for ESM modules. (#​11893)

v27.2.1

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Features

• [jest-transform] Improve the unexpected token error message. (#​11807)

Fixes

• [jest-runtime] Fix regression when using jest.isolateModules and mocks (#​11882)
• [jest-runtime] Include test name when importing modules after test has completed (#​11885)
• [jest-runtime] Error when ESM import is used after test is torn down (#​11885)

v27.2.0

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Features

• [jest-resolver, jest-runtime] Pass conditions to custom resolvers to enable them to implement support for package.json exports field (#​11859)
• [jest-runtime] Allow custom envs to specify exportConditions which is passed together with Jest's own conditions to custom resolvers (#​11863)

Fixes

• [@jest/reporters] Use async transform if available to transform files with no coverage (#​11852)
• [jest-util] Return correct value from process.send stub (#​11799)

v27.1.1

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Features

• [jest-runtime] Add experimental, limited (and undocumented) support for mocking ECMAScript Modules (#​11818)

Fixes

• [jest-resolver] Support node: prefix when importing Node core modules with ESM (#​11817)
• [jest-types] Export the PrettyFormatOptions interface (#​11801)

v27.1.0

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Features

• [jest-haste-map] Use watchman suffix-set option for faster file indexing. (#​11784)
• [jest-cli] Adds a new config options snapshotFormat which offers a way to override any of the formatting settings which come with pretty-format. (#​11654)
• [jest-reporters] Expose the getSummary util (#​11695).
• [jest-resolver] Support node: prefix when importing Node core modules (#​11331)

Fixes

• [jest-each] Relaxed the validation to allow multibyte characters in headings (#​11575)
• [jest-environment-jsdom] Add support for userAgent option (#​11773)
• [jest-environment-node] Add Event and EventTarget to node global environment. (#​11727)
• [jest-mock] Fix spyOn to use Object.prototype.hasOwnProperty (#​11721)
• [jest-resolver] Add dependency on jest-haste-map (#​11759)
• [jest-types] Compat with @types/node v16 (#​11645)

Chore & Maintenance

• [docs] Correct expects.assertions documentation by adding async/await for asynchronous function.

v27.0.6

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Fixes

• [*] Publish all modules to include the build change in (#​11569)

v27.0.5

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Features

• [@jest/fake-timers] Flush callbacks scheduled with requestAnimationFrame every 16ms when using legacy timers. (#​11523)
• [pretty-format] Use globalThis (with polyfill if required) to bring support for esbuild's browser bundling mode (#​11569)

Fixes

• [jest-core] Support special characters like @, + and () on Windows with --findRelatedTests (#​11548)
• [@jest/fake-timers] Do not add setImmediate and clearImmediate if they do not exist in the global environment (#​11599)
• [@jest/reporters] Allow node-notifier@10 as peer dependency (#​11523)
• [@jest/reporters] Update v8-to-istanbul (#​11523)

v27.0.2

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Features

• [jest-circus] Add some APIs to make it easier to build your own test runner
• [jest-reporters] Expose the getResultHeader util (#​11460)
• [jest-resolver] Export resolve* utils for different Jest modules (#​11466)
• [@jest/test-result] Export Test, TestEvents and TestFileEvent (#​11466)

Fixes

• [jest-circus] Add missing slash dependency (#​11465)
• [jest-circus, @​jest/test-sequencer] Remove dependency on jest-runner (#​11466)
• [jest-config] Resolve config.runner to absolute path (#​11465)
• [jest-config] Make sure to support functions as config (#​11475)
• [jest-core] Do not warn about DNSCHANNEL handles when using the --detectOpenHandles option (#​11470)
• [jest-runner] Remove dependency on jest-config (#​11466)
• [jest-worker] Loosen engine requirement to >= 10.13.0 (#​11451)

v27.0.1

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Fixes

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

v27.0.0

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Features

• [babel-jest] Add async transformation (#​11192)
• [jest-changed-files] Use '--' to separate paths from revisions (#​11160)
• [jest-circus] [BREAKING] Fail tests when multiple done() calls are made (#​10624)
• [jest-circus, jest-jasmine2] [BREAKING] Fail the test instead of just warning when describe returns a value (#​10947)
• [jest-config] [BREAKING] Default to Node testing environment instead of browser (JSDOM) (#​9874)
• [jest-config] [BREAKING] Use jest-circus as default test runner (#​10686)
• [jest-config] Add support for preset written in ESM (#​11200)
• [jest-config, jest-runtime] Support ESM for files other than .js and .mjs (#​10823)
• [jest-config, jest-runtime] [BREAKING] Use "modern" implementation as default for fake timers (#​10874 & #​11197)
• [jest-config Allow passing forceNodeFilesystemAPI through to jest-haste-map (#​11264)
• [jest-config, jest-haste-map, jest-resolve, jest-runner, jest-runtime, jest-test-sequencer, jest-transform, jest-types] [BREAKING] Add custom HasteMap class implementation config option (#​11107)
• [jest-core] make TestWatcher extend emittery (#​10324)
• [jest-core] Run failed tests interactively the same way we do with snapshots (#​10858)
• [jest-core] more TestSequencer methods can be async (#​10980)
• [jest-core] Add support for testSequencer written in ESM (#​11207)
• [jest-core] Add support for globalSetup and globalTeardown written in ESM (#​11267)
• [jest-core] Add support for watchPlugins written in ESM (#​11315)
• [jest-core] Add support for runner written in ESM (#​11232)
• [jest-core] Add support for reporters written in ESM (#​11427)
• [jest-each] Add support for interpolation with object properties (#​11388)
• [jest-environment-node] Add AbortController to globals (#​11182)
• [@jest/fake-timers] Update to @sinonjs/fake-timers to v7 (#​11198)
• [jest-haste-map] Handle injected scm clocks (#​10966)
• [jest-haste-map] Add enableSymlinks configuration option to follow symlinks for test files (#​9351)
• [jest-repl, jest-runner] [BREAKING] Run transforms over environment (#​8751)
• [jest-repl] Add support for testEnvironment written in ESM (#​11232)
• [jest-reporters] Add static filepath property to all reporters (#​11015)
• [jest-runner] [BREAKING] set exit code to 1 if test logs after teardown (#​10728)
• [jest-runner] [BREAKING] Run transforms over runner (#​8823)
• [jest-runner] [BREAKING] Run transforms over testRunner (#​8823)
• [jest-runner] Possibility to use ESM for test environment (11033)
• [jest-runner] Add support for testRunner written in ESM (#​11232)
• [jest-runtime] Detect reexports from CJS as named exports in ESM (#​10988)
• [jest-runtime] Support for async code transformations (#​11191 & #​11220)
• [jest-snapshot] [BREAKING] Make prettier optional for inline snapshots - fall back to string replacement (#​7792 & #​11192)
• [jest-snapshot] [BREAKING] Run transforms over snapshotResolver (#​8751)
• [jest-transform] Pass config options defined in Jest's config to transformer's process and getCacheKey functions (#​10926)
• [jest-transform] Add support for transformers written in ESM (#​11163)
• [jest-transform] [BREAKING] Do not export ScriptTransformer class, instead export the async function createScriptTransformer (#​11163)
• [jest-transform] Async code transformations (#​9889)
• [jest-transform] Support transpiled transformers (#​11193)
• [jest-transform] [BREAKING] requireAndTranspileModule always return a Promise, and the third parameter type is changed to RequireAndTranspileModuleOptions which accept applyInteropRequireDefault option (#​11232)
• [jest-transform] [BREAKING] createTranspilingRequire return function which return a Promise now (#​11232)
• [jest-util] add requireOrImportModule for importing CJS or ESM (#​11199)
• [jest-util] add applyInteropRequireDefault option on requireOrImportModule (#​11232)
• [jest-watcher] Added support for clearing the line when <C-u> is pressed in a watch mode pattern prompt (#​11358)
• [jest-worker] Add support for custom task queues and adds a PriorityQueue implementation. (#​10921)
• [jest-worker] Add in-order scheduling policy to jest worker (10902)
• [pretty-format] Better print for sparse arrays (11326)
• [pretty-print] Add option printBasicPrototype which determines whether or not the prototype should be printed for raw objects or arrays (#​11441)

Fixes

• [babel-plugin-jest-hoist] Add __dirname and __filename to whitelisted globals (#​10903)
• [expect] [BREAKING] Revise expect.not.objectContaining() to be the inverse of expect.objectContaining(), as documented. (#​10708)
• [expect] [BREAKING] Make toContain more strict with the received type (#​10119 & #​10929)
• [expect] [BREAKING] matcherResult on JestAssertionError are now strings rather than functions (#​10989)
• [jest-circus] Fixed the issue of beforeAll & afterAll hooks getting executed even if it is inside a skipped describe block (#​10806)
• [jest-circus] Fix testLocation on Windows when using test.each (#​10871)
• [jest-cli] Use testFailureExitCode when bailing from a failed test (#​10958)
• [jest-cli] Print custom error if error thrown from global hooks is not an error already (#​11003)
• [jest-cli] Allow running multiple "projects" from programmatic API (#​11307)
• [jest-cli] Fix missing collectCoverage after init (#​11353)
• [jest-cli, jest-config, jest-types] Move all default values into jest-config (#​9924)
• [jest-config] [BREAKING] Change default file extension order by moving json behind ts and tsx (10572)
• [jest-console] console.dir now respects the second argument correctly (#​10638)
• [jest-core] Don't report PerformanceObserver as open handle (#​11123)
• [jest-core] Use WeakRef to hold timers when detecting open handles (#​11277)
• [jest-core] Correctly detect open handles that were created in test functions using done callbacks (#​11382)
• [jest-core] Do not collect RANDOMBYTESREQUEST as open handles (#​11278)
• [jest-core] Wait briefly for open handles to close before flagging them when using --detectOpenHandles (#​11429)
• [jest-diff] [BREAKING] Use only named exports (#​11371)
• [jest-each] [BREAKING] Ignore excess words in headings (#​8766)
• [jest-each] Support array index with template strings (#​10763)
• [jest-each] Interpolate %% correctly (#​11364)
• [jest-each] Fix wrong interpolation when the value of array contains multiple % (#​11364)
• [jest-environment] [BREAKING] Drop support for runScript for test environments (#​11155)
• [jest-environment-jsdom] Use inner realm’s ArrayBuffer constructor (#​10885)
• [jest-environment-jsdom] [BREAKING] Remove Node globals setImmediate and clearImmediate (#​11222)
• [jest-get-type] [BREAKING] Convert to ES Module (#​11359)
• [jest-globals] [BREAKING] Disallow return values other than a Promise from hooks and tests (#​10512)
• [jest-globals] [BREAKING] Disallow mixing a done callback and returning a Promise from hooks and tests (#​10512)
• [jest-haste-map] Vendor NodeWatcher from sane (#​10919)
• [jest-jasmine2] Fixed the issue of beforeAll & afterAll hooks getting executed even if it is inside a skipped describe block when it has child tests marked as either only or todo (#​10806)
• [jest-jasmine2] Fixed the issues of child tests marked with only or todo getting executed even if it is inside a skipped parent describe block (#​10806)
• [jest-jasmine2] Wrap all test functions so they open handles that were created in test functions using done callbacks can be detected (#​11382)
• [jest-reporter] Handle empty files when reporting code coverage with V8 (#​10819)
• [jest-resolve] Replace read-pkg-up with escalade package (#​10781)
• [jest-resolve] Disable jest-pnp-resolver for Yarn 2 (#​10847)
• [jest-runtime] [BREAKING] Do not inject global variable into module wrapper (#​10644)
• [jest-runtime] [BREAKING] remove long-deprecated jest.addMatchers, jest.resetModuleRegistry, and jest.runTimersToTime (#​9853)
• [jest-runtime] Fix stack overflow and promise deadlock when importing mutual dependant ES module (#​10892)
• [jest-runtime] Prevent global module registry from leaking into isolateModules registry (#​10963)
• [jest-runtime] Refactor to prevent race condition when linking and evaluating ES Modules (#​11150)
• [jest-runtime] Throw correct error when attempting to load ESM via require (#​11260)
• [jest-runtime] Do not cache modules that throw during evaluation (#​11263)
• [jest-transform] Show enhanced SyntaxError message for all SyntaxErrors (#​10749)
• [jest-transform] [BREAKING] Refactor API to pass an options bag around rather than multiple boolean options (#​10753)
• [jest-transform] [BREAKING] Refactor API of transformers to pass an options bag rather than separate config and other options (#​10834)
• [jest-types] Fix Config.ts projects types (#​11285)
• [jest-util] Replace micromatch with picomatch to fix issues with negated globs (#​11287)
• [jest-validate] Use en-US locale to avoid case conversion problems while validating CLI options on machines with some certain locales(e.g. Turkish) set as default locale. (#​11412)
• [jest-worker] [BREAKING] Use named exports (#​10623)
• [jest-worker] Do not swallow errors during serialization (#​10984)
• [jest-worker] Handle ERR_IPC_CHANNEL_CLOSED errors properly (#​11143)
• [pretty-format] [BREAKING] Convert to ES Modules (#​10515)
• [pretty-format] Only call hasAttribute if it's a function (#​11000)
• [pretty-format] Handle jsdom attributes properly (#​11189)
• [pretty-format] Import pretty-format using named imports (#​11360)

Chore & Maintenance

• [*] [BREAKING] Only support Node LTS releases and Node 15 (#​10685)
• [*] [BREAKING] Add exports field to all package.jsons (#​9921)
• [*] Make it easier for Jest's packages to use the VM escape hatch (#​10824)
• [*] [BREAKING] Remove deprecated mapCoverage (#​9968)
• [babel-jest] [BREAKING] Migrate to ESM (#​11193)
• [docs] Correct example using browser-resolve (#​11140)
• [docs] Clarify timers configuration property (#​11376)
• [jest, jest-core] [BREAKING] Replace TestScheduler export with createTestScheduler (#​11427)
• [jest-config] [BREAKING] Remove enabledTestsMap config, use filter instead (#​10787)
• [jest-console] [BREAKING] Move root into config and take GlobalConfig as mandatory parameter for getConsoleOutput (#​10126)
• [jest-console] Export LogEntry (#​11017)
• [jest-fake-timers] Clarify global behavior of jest.useFakeTimers and jest.useRealTimers (#​10867)
• [jest-haste-map] [BREAKING] Migrate to ESM (#​10875)
• [jest-haste-map] [BREAKING] Remove support for deprecated option ignorePattern as function (#​10348)
• [jest-jasmine2] [BREAKING] Migrate to ESM (#​10906)
• [jest-jasmine2] [BREAKING] Remove unused options argument from Env constructor (#​10240)
• [jest-repl, jest-runtime] [BREAKING] Move the jest-runtime CLI into jest-repl (#​10016 & #​10925)
• [jest-resolve] [BREAKING] Migrate to ESM (#​10688)
• [jest-resolve-dependencies] [BREAKING] Migrate to ESM (#​10876)
• [jest-mock] [BREAKING] Migrate to ESM (#​10887)
• [jest-reporters] [BREAKING] Make node-notifier a peer dependency (#​10977)
• [jest-resolve, jest-runtime] [BREAKING] Use Maps instead of objects for all cached resources (#​10968)
• [jest-runner] [BREAKING] Migrate to ESM (#​10900)
• [jest-runtime] [BREAKING] Remove deprecated and unused getSourceMapInfo from Runtime (#​9969)
• [jest-transformer] [BREAKING] Remove unused isCoreModule option (#​11166)
• [jest-util] No longer checking enumerable when adding process.domain (#​10862)
• [jest-validate] [BREAKING] Remove recursiveBlacklist option in favor of previously introduced recursiveDenylist (#​10650)
• [website] Replace 'Github' with 'GitHub' (#​11279)
• [website] Remove a language code from the link to the Node.js website (#​11282)
• [website] Remove a duplicated word (#​11281)
• [website] Add french to website (#​11361)

Performance

• [jest-resolve] Cache reading and parsing of package.jsons (#​11076)
• [jest-runtime, jest-transform] share cacheFS between runtime and transformer (#​10901)
• [jest-runtime] Load chalk only once per worker (#​10864)
• [jest-worker] Fix memory leak of previous task arguments while no new task is scheduled (#​11187)

v26.6.3

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Fixes

• [jest-resolve-dependencies] Continue dependency resolution if mock dependency can't be found (#​10779)

v26.6.2

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Features

• [jest-core] Add findRelatedTests and nonFlagArgs in allowed config options for updateConfigAndRun in watch plugins (#​10659)

Fixes

• [babel-plugin-jest-hoist] Preserve order of hoisted mock nodes within containing block (#​10536)
• [babel-plugin-jest-hoist] Hoist pure constants to support experimental JSX transform in hoisted mocks (#​10723)
• [babel-preset-jest] Update babel-preset-current-node-syntax to support top level await (#​10747)
• [expect] Revert "Fix objectContaining to work recursively into sub-objects (#​10508)" (#​10766)
• [jest-circus, jest-jasmine2] fix: don't assume stack is always a string (#​10697)
• [jest-config] Fix bug introduced in watch mode by PR #​10678 (#​10692)
• [jest-config] Throw correct error for missing preset modules (#​10737)
• [jest-resolve-dependencies] Resolve mocks as dependencies (#​10713)
• [jest-runtime] Handle file URLs in dynamic imports (#​10744)
• [jest-runtime, babel-jest] Pass more ESM options to @jest/transform (#​10752)
• [jest-runtime] Properly inject extraGlobals into the runtime (#​10758)
• [jest-transform] Link to ESM docs on syntax errors (#​10748)

Chore & Maintenance

• [docs] Add docs for using mocks in TypeScript (#​10415)
• [eslint-config-fb-strict] Move package from this repo to fbjs repo (#​10739)
• [examples] Update TypeScript example to show use of newer Jest types (#​10399)
• [jest-cli] chore: standardize files and folder names (#​10698)
• [jest-config] Switch ts-node Register type to Service due to deprecation (#​11210)

v26.6.1

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Features

• [jest-runtime] Support named exports from CommonJS as named ES Module imports (#​10673)
• [jest-validate] Add support for recursiveDenylist option as an alternative to recursiveBlacklist (#​10236)

Fixes

• [expect] Fix objectContaining to work recursively into sub-objects (#​10508)
• [jest-cli, jest-core, jest-config, jest-types] Fix --onlyFailures flag to work in non-watch mode (#​10678)
• [jest-config] Fix for the jest.config.ts compiler to not interfere with tsconfig.json files (#​10675)
• [jest-message-util] Update to work properly with Node 15 (#​10660)
• [jest-mock] Allow to mock methods in getters (TypeScript 3.9 export) (#​10156)

v26.6.0

Compare Source

Features

• [jest-cli, jest-config] Add support for the jest.config.ts configuration file (#​10564)

Fixes

• [jest-config] Simplify transform RegExp (#​10207)
• [jest-fake-timers] Lazily instantiate mock timers (#​10551)
• [jest-runtime] require.main is no longer undefined when using jest.resetModules (#​10626)
• [@jest/types] Add missing values for timers (#​10632)

Chore & Maintenance

• [docs] Add step for fetching backers.json file in website setup docs (#​10631)
• [docs] Add page detailing environment variables set by Jest (#​10630)
• [jest-circus] Refactor callAsyncCircusFn parameters (#​10629)