@jest/transform

Features

• jest-config: Support ESM config files with .js extension (#9573).

• jest-runtime: Override module.createRequire to return a Jest-compatible require function

• breaking

  jest-haste-map: Remove mapper option

• *: Support array of paths for moduleNameMapper aliases

• jest-reporters: Adds ability to pass options to the istanbul-reporter through coverageReporters

• jest-runtime: Require stack when a module cannot be resolved

• jest-transform: writeCacheFile no longer calls fsync

Fixes

• expect: Handle readonly properties correctly

• jest-cli: Set coverageProvider correctly when provided in config

• jest-cli: Allow specifying .cjs and .mjs config files by --config CLI option

• jest-cli: Update yargs to fix CLI flag overriding

• jest-config: Treat setupFilesAfterEnv like setupFiles when normalizing configs against presets

• jest-config: Support .mjs config files on Windows as well

• jest-config: Verify rootDir and all roots are directories

• jest-config: Ensure pattern of replacePosixSep is a string

• jest-haste-map: Fix crash on unix based systems without find

• jest-jasmine2: Fix --testNamePattern matching with concurrent tests

• jest-matcher-utils: Fix diff highlight of symbol-keyed object.

• @jest/reporters: Notifications should be fire&forget rather than having a timeout

• jest-resolve: Fix module identity preservation with symlinks and browser field resolution

• jest-resolve: Do not confuse directories with files

• jest-resolve: moduleNameMapper should take precedence over Node core modules

• jest-runtime: Reset isolateModules if it fails

• jest-runtime: Yarn PnP errors displayed to the user

• jest-snapshot: Downgrade semver to v6 to support node 8

• jest-snapshot: Properly indent new snapshots in the presences of existing ones

• jest-transform: Correct sourcemap behavior for transformed and instrumented code

• jest-transform: Allow instrumentation of transformed files with weird file extensions

• @jest/types: Make ConfigGlobals an interface to allow for declaration merging.

• pretty-format: Export OldPlugin type

Performance

• jest-haste-map: Reduce number of lstat calls in node crawler