@jest/core

Features

• jest-circus, jest-snapshot: Add support for snapshot matchers in concurrent tests

• jest-cli: Include type definitions to generated config files

• jest-snapshot: Support arrays as property matchers

• [jest-core, jest-circus, jest-reporter, jest-runner] Added support for reporting about start individual test cases using jest-circus

Fixes

• jest-circus: Prevent false test failures caused by promise rejections handled asynchronously

• jest-config: Handle frozen config object

• jest-config: Allow coverageDirectory and collectCoverageFrom in project config

• jest-core: Always use workers in watch mode to avoid crashes (#14059).

• jest-environment-jsdom, jest-environment-node: Fix assignment of customExportConditions via testEnvironmentOptions when custom env subclass defines a default value

• jest-matcher-utils: Fix copying value of inherited getters

• jest-mock: Tweak typings to allow jest.replaceProperty() replace methods

• jest-mock: Improve user input validation and error messages of spyOn and replaceProperty methods

• jest-runtime: Bind jest.isolateModulesAsync to this

• jest-runtime: Forward wrapperLength to the Script constructor as columnOffset for accurate debugging

• jest-runtime: Guard _isMockFunction access with in

• jest-snapshot: Fix a potential bug when not using prettier and improve performance

• @jest/transform: Do not instrument .json modules

• jest-worker: Restart a shut down worker before sending it a task

Chore & Maintenance

• security

  *: Update semver dependency to get vulnerability fix