@jest/transform

Features

• expect: Highlight substring differences when matcher fails, part 1

• expect: Highlight substring differences when matcher fails, part 2

• expect: Improve report when mock-spy matcher fails, part 1

• expect: Improve report when mock-spy matcher fails, part 2

• expect: Improve report when mock-spy matcher fails, part 3

• expect: Improve report when mock-spy matcher fails, part 4

• expect: Throw matcher error when received cannot be jasmine spy

• expect: Improve report when negative CalledWith assertion fails

• expect: Improve report when positive CalledWith assertion fails

• expect: Display equal values for ReturnedWith similar to CalledWith

• expect, jest-snapshot: Change color from green for some args in matcher hints

• jest-snapshot: Highlight substring differences when matcher fails, part 3

• jest-core: Improve report when snapshots are obsolete

• jest-cli: Improve chai support (with detailed output, to match jest exceptions)

• *: Manage the global timeout with --testTimeout command line argument.

• pretty-format: Render custom displayName of memoized components

• jest-validate: Allow maxWorkers as part of the jest.config.js

• jest-runtime: Allow passing configuration objects to transformers

• @jest/core, @jest/test-sequencer: Support async sort in custom testSequencer

• jest-runtime, @jest/fake-timers: Add jest.advanceTimersToNextTimer

• @jest-transform: Extract transforming require logic within jest-core into @jest-transform

• jest-matcher-utils: Add color options to matcherHint

• jest-circus/jest-jasmine2: Give clearer output for Node assert errors

• jest-runner: Export all types in the type signature of jest-runner

Fixes

• jest-cli: Detect side-effect only imports when running --onlyChanged or --changedSince

• jest-cli: Allow --maxWorkers to work with % input again

• babel-plugin-jest-hoist: Expand list of whitelisted globals in global mocks

• jest-core: Make watch plugin initialization errors look nice

• jest-snapshot: Prevent inline snapshots from drifting when inline snapshots are updated

• jest-haste-map: Don't throw on missing mapper in Node crawler

• jest-core: Fix incorrect passWithNoTests warning

• jest-snapshots: Fix test retries that contain snapshots

• jest-mock: Fix incorrect assignments when restoring mocks in instances where they originally didn't exist

• expect: Fix stack overflow when matching objects with circular references

• jest-haste-map: Workaround a node >=12.5.0 bug that causes the process not to exit after tests have completed and cancerous memory growth

Performance

• jest-watcher: Minor optimization for JestHook

• @jest/reporters: Prevent runaway CPU useage with --notify on macOS