jest 19.0.0

• Breaking Change: Added a version for snapshots.
• Breaking Change: Removed the mocksPattern configuration option, it never worked correctly.
• Breaking Change: Renamed testPathDirs to roots to avoid confusion when configuring Jest.
• Breaking Change: Updated printing of React elements to cause fewer changes when props change.
• Breaking Change: Updated snapshot format to properly escape data.
• Fixed --color to be recognized correctly again.
• Fixed babel-plugin-jest-hoist to work properly with type annotations in tests.
• Fixed behavior for console.log calls and fixed a memory leak (#2539).
• Fixed cache directory path for Jest to avoid ENAMETOOLONG errors.
• Fixed change events to be emitted in jest-haste-map's watch mode. This fixes issues with Jest's new watch mode and react-native-packager.
• Fixed cli arguments to be used when loading the config from file, they were previously ignored.
• Fixed Jest to load json files that include a BOM.
• Fixed Jest to throw errors instead of ignoring invalid cli options.
• Fixed mocking behavior for virtual modules.
• Fixed mocking behavior with transitive dependencies.
• Fixed support for asymmetric matchers in toMatchObject.
• Fixed test interruption and --bail behavior.
• Fixed watch mode to clean up worker processes when a test run gets interrupted.
• Fixed whitespace to be highlighted in snapshots and assertion errors.
• Improved babel-jest plugin: babel is loaded lazily, istanbul comments are only added when coverage is used.
• Improved error for invalid transform config.
• Improved moduleNameMapper to not overwrite mocks when many patterns map to the same file.
• Improved printing of skipped tests in verbose mode.
• Improved resolution code in jest-resolve.
• Improved to only show patch marks in assertion errors when the comparison results in large objects.
• New --collectCoverageFrom cli argument.
• New --coverageDirectory cli argument.
• New expect.addSnapshotSerializer to add custom snapshot serializers for tests.
• New jest.spyOn.
• New testMatch configuration option that accepts glob patterns.
• New eslint-plugin-jest with no-disabled-tests, no-focuses-tests and no-identical-title rules and default configuration and globals.
• New expect.stringContaining asymmetric matcher.
• New feature to make manual mocks with nested folders work. For example __mocks__/react-native/Library/Text.js will now work as expected.
• New feature to re-run tests through the notification when using --notify.
• New jest-phabricator package to integrate Jest code coverage in phabriactor.
• New jest-validate package to improve configuration errors, help with suggestions of correct configuration and to be adopted in other libraries.
• New pretty-printing for asymmetric matchers.
• New RSS feed for Jest's blog.
• New way to provide a reducer to extract haste module ids.
• New website, new documentation, new color scheme and new homepage.
• Rewritten watch mode for instant feedback, better code quality and to build new features on top of it (#2362).

jest 18.1.0

• Fixed console.log and fake timer behavior in node 7.3.
• Updated istanbul-api.
• Updated jest-diff equality error message.
• Disabled arrow keys when entering a pattern in watch mode to prevent broken behavior. Will be improved in a future release.
• Moved asymmetric matchers and equality functionality from Jasmine into jest-matchers.
• Removed jasmine and jest-snapshot dependency from jest-matchers.
• Removed unused global context variable.
• Show a better error message if the config is invalid JSON.
• Highlight trailing whitespace in assertion diffs and snapshots.
• Jest now uses micromatch instead of minimatch.
• Added -h as alias for --help.

jest 18.0.0

See https://jestjs.io/blog/2016/12/15/2016-in-jest

• The testResultsProcessor function is now required to return the modified results.
• Removed pit and mockImpl. Use it or mockImplementation instead.
• Fixed re-running tests when --bail is used together with --watch.
• pretty-format is now merged into Jest.
• require('v8') now works properly in a test context.
• Jest now clears the entire scrollback in watch mode.
• Added expect.any, expect.anything, expect.objectContaining, expect.arrayContaining, expect.stringMatching.
• Properly resolve snapshotSerializers, setupFiles, transform, testRunner and testResultsProcessor instead of using path.resolve.
• --testResultsProcessor is now exposed through the cli.
• Renamed --jsonOutputFile to --outputFile.
• Added jest-editor-support for vscode and Nuclide integration.
• Fixed test.concurrent unhandled promise rejections.
• The Jest website is now auto-deployed when merging into main.
• Updated testRegex to include test.js and spec.js files.
• Fixes for babel-plugin-jest-hoist when using jest.mock with three arguments.
• The JSON global in jest-environment-node now comes from the vm context instead of the parent context.
• Jest does not print stack traces from babel any longer.
• Fake timers are reset when FakeTimers.useTimers() is called.
• Usage of Jest in watch mode can be hidden through JEST_HIDE_USAGE.
• Added expect.assertions(number) which will ensure that a specified amount of assertions is made in one test.
• Added .toMatchSnapshot(?string) feature to give snapshots a name.
• Escape regex in snapshots.
• jest-react-native was deprecated and now forwards react-native.
• Added .toMatchObject matcher.
• Further improve printing of large objects.
• Fixed NaN% Failed in the OS notification when using --notify.
• The first test run without cached timings will now use separate processes instead of running in band.
• Added .toHaveProperty matcher.
• Fixed Map/Set comparisons.
• test.concurrent now works with --testNamePattern.

24.3.1

Fixes

• [jest-cli] export functions compatible with import {default} (#8080)
• [jest-worker]: Fix retries and error notification in workers (#8079)

Chore & Maintenance

• [pretty-format]: Use react-is instead of manual $$typeof checks (#8060)

24.3.0

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

Features

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

Fixes

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

Chore & Maintenance

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

Performance

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