jest-util

Blog post: jestjs.io/blog/2022/08/25/jest-29

Features

• breaking

  expect: Differentiate between MatcherContext MatcherUtils and MatcherState types

• jest-circus: Add support for test.failing.each

• breaking

  jest-config: Make snapshotFormat default to escapeString: false and printBasicPrototype: false

• breaking

  jest-config: Remove undocumented collectCoverageOnlyFrom option

• breaking

  jest-environment-jsdom: Upgrade to jsdom@20 (#13037, #13058)

• @jest/globals: Add jest.Mocked, jest.MockedClass, jest.MockedFunction and jest.MockedObject utility types

• breaking

  jest-mock: Refactor Mocked* utility types. MaybeMockedDeep and MaybeMocked became Mocked and MockedShallow respectively; only deep mocked variants of MockedClass, MockedFunction and MockedObject are exported (#13123, #13124)

• breaking

  jest-mock: Change the default jest.mocked helper’s behavior to deep mocked

• breaking

  jest-snapshot: Let babel find config when updating inline snapshots

• breaking

  @jest/test-result, @jest/types: Replace Bytes and Milliseconds types with number

• 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, #13105, #13106, #13107)

• breaking

  pretty-format: Remove ConvertAnsi plugin in favour of jest-serializer-ansi-escapes

• pretty-format: Allow to opt out from sorting object keys with compareKeys: null

Fixes

• jest-config: Fix testing multiple projects with TypeScript config files

• @jest/expect-utils: Fix deep equality of ImmutableJS Record

• jest-haste-map: Increase the maximum possible file size that jest-haste-map can handle

• jest-runtime: Properly support CJS re-exports from dual packages

• jest-snapshot: Make prettierPath optional in SnapshotState

• jest-snapshot: Fix parsing error from inline snapshot files with JSX

• jest-worker: When a process runs out of memory worker exits correctly and doesn't spin indefinitely

Chore & Maintenance

• breaking

  *: Drop support for Node v12 and v17

• breaking

  jest-snapshot: Require rootDir as argument to SnapshotState