npm jest 30.4.0
v30.4.0
on Node.js NPM

5 hours ago

Big release! 😀

Main feature is a rewrite of our custom runtime in preparation for stabilisation of native support of ESM. As part of that work require(esm) module is now supported (still requires --experimental-vm-modules like before).

In addition we now support fake timers for the recently released Temporal API in Node v26.

React 19 is also supported properly in pretty-format, meaning snapshots of React components now work like they should.

Full list of changes below

Features

  • [babel-jest] Support collecting coverage from .mts, .cts (and other) files (#15994)
  • [jest-circus, jest-cli, jest-config, jest-core, jest-jasmine2, jest-types] Add --collect-tests flag to discover and list tests without executing them (#16006)
  • [jest-config, jest-runner, jest-worker] Add workerGracefulExitTimeout config option to control how long workers are given to exit before being force-killed (#15984)
  • [jest-config] Add support for jest.config.mts as a valid configuration file (#16005)
  • [jest-config, jest-core, jest-reporters, jest-runner] verbose and silent can now be set per-project; the project-level value overrides the global value for that project's tests (#16133)
  • [@jest/fake-timers] Accept Temporal.Duration in jest.advanceTimersByTime() and jest.advanceTimersByTimeAsync() (#16128)
  • [@jest/fake-timers] Accept Temporal.Instant and Temporal.ZonedDateTime in jest.setSystemTime() and useFakeTimers({now}) (#16128)
  • [@jest/fake-timers] Support faking Temporal.Now.* (#16131)
  • [jest-mock] Add clearMocksOnScope(scope) on ModuleMocker for clearing every mock function exposed on a scope object (#16088)
  • [jest-resolve] Add canResolveSync() on Resolver so callers can detect when a user-configured resolver only exports an async hook (#16064)
  • [jest-runtime] Use synchronous evaluate() for ES modules without top-level await on Node versions that support it (v24.9+), and prefer the synchronous transform path when a sync transformer is configured (#16062)
  • [jest-runtime] Support require() of ES modules on Node v24.9+ (#16074)
  • [jest-runtime] Validate TC39 import attributes (with { type: 'json' }) on ESM imports (#16127)
  • [@jest/transform] Add canTransformSync(filename) on ScriptTransformer so callers can pick the sync vs async transform path (#16062)
  • [jest-util] Add isError helper (#16076)
  • [pretty-format] Support React 19 (#16123)

Fixes

  • [expect-utils] Fix toStrictEqual failing on structuredClone results due to cross-realm constructor mismatch (#15959)
  • [@jest/expect-utils] Prevent toMatchObject/subset matching from throwing when encountering exotic iterables (#15952)
  • [fake-timers] Convert Date to milliseconds before passing to @sinonjs/fake-timers (#16029)
  • [jest] Export GlobalConfig and ProjectConfig TypeScript types (#16132)
  • [jest-circus] Prevent crash when asyncError is undefined for non-Error throws (#16003)
  • [jest-circus, jest-jasmine2] Include Error.cause in JSON failureMessages output (#15967)
  • [jest-config] Fix preset path resolution on Windows when the preset uses subpath exports (#15961)
  • [jest-config] Allow collectCoverage and coverageProvider in project config without a validation warning (#16132)
  • [jest-config] Project config validator now emits "is not supported in an individual project configuration" instead of "probably a typing mistake" for known global-only options (#16132)
  • [jest-environment-node] Fix --localstorage-file warning on Node 25+ (#16086)
  • [jest-reporters] Apply global coverage threshold to unmatched pattern files in addition to glob/path thresholds (#16137)
  • [jest-reporters, jest-runner, jest-runtime, jest-transform] Fix coverage report not showing correct code coverage when using projects config option (#16140)
  • [jest-runtime] Resolve expect and @jest/expect from the internal module registry so test-file imports share the same JestAssertionError as the global expect (#16130)
  • [jest-runtime] Improve CJS-from-ESM interop: __esModule/Babel default unwrap, broader named-export coverage, and shared CJS singleton across importers (#16050)
  • [jest-runtime] Load .js files with ESM syntax but no "type":"module" marker as native ESM (#16050)
  • [jest-runtime] Extend the .js-with-ESM-syntax fallback to require() on Node v24.9+ - falls back to require(esm) when the CJS parser rejects ESM syntax (#16078)
  • [jest-runtime] Fix deadlocks and double-evaluation in concurrent ESM and wasm imports (#16050)
  • [jest-runtime] Fix error when require() is called after the Jest environment has been torn down (#15951)
  • [jest-runtime] Fix missing error when import() is called after the Jest environment has been torn down (#16080)
  • [jest-runtime] Fix virtual unstable_mockModule registrations not respected in ESM (#16081)
  • [jest-runtime] Apply moduleNameMapper when resolving modules with require.resolve() and the paths option (#16135)

Chore & Maintenance

  • [@jest/fake-timers] Upgrade @sinonjs/fake-timers (#16139)
  • [jest-runtime] Use synchronous linkRequests / instantiate for ESM linking on Node v24.9+ (#16063)

New Contributors

Full Changelog: v30.3.0...v30.4.0

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