@jest/fake-timers

Features

• jest-circus: Bind to Circus events via an optional event handler on any custom env

• expect: Improve report when matcher fails, part 15

• jest-cli: Update --forceExit and "did not exit for one second" message colors

• expect: Improve report when matcher fails, part 16

• jest-runner: Pass docblock pragmas to TestEnvironment constructor

• expect: Improve report when matcher fails, part 17

• expect: Improve report when matcher fails, part 18

• expect: Improve report when matcher fails, part 19

Fixes

• jest-each: Fix bug with placeholder values

• jest-snapshot: Inline snapshots: do not indent empty lines

• @jest/runtime, @jest/transform: Allow custom transforms for JSON dependencies

• jest-core: Make detectOpenHandles imply runInBand

• jest-haste-map: Fix the mapper option which was incorrectly ignored

• jest-jasmine2: Fix describe return value warning being shown if the describe function throws

• jest-environment-jsdom: Re-declare global prototype of JSDOMEnvironment

• jest-snapshot: Handle arrays when merging snapshots

• expect: Extract names of async and generator functions

• jest-runtime: Fix virtual mocks not being unmockable after previously being mocked

• jest-transform: Replace special characters in transform cache filenames to support Windows

• jest-config: Allow exactly one project

Performance

• jest-runtime: Fix module registry memory leak

• jest-resolve: Optimize resolve module path

• jest-resolve: Cache current directory

• jest-get-type: Simplify checking for primitive