Upgrading @jest/globals 26 to 27

Uses the modern implementation as the default for fake timers.

Changes the default file extension order by moving json behind ts and tsx.

Removes Node globals setImmediate and clearImmediate from jest-environment-jsdom.

Removes long-deprecated jest.addMatchers, jest.resetModuleRegistry, and jest.runTimersToTime.

Removes the deprecated mapCoverage option.

Removes the enabledTestsMap config in favor of filter.

Removes support for the deprecated ignorePattern option as a function.

Removes the unused options argument from the Env constructor in jest-jasmine2.

Removes the deprecated and unused getSourceMapInfo from Runtime.

Removes the unused isCoreModule option from jest-transformer.

Removes the recursiveBlacklist option in favor of recursiveDenylist in jest-validate.

jest-config defaults to the Node testing environment instead of browser (JSDOM).

jest-config uses jest-circus as the default test runner.

Adds a custom HasteMap class implementation config option.

Runs transforms over the environment in jest-repl and jest-runner.

Runs transforms over runner in jest-runner.

Runs transforms over testRunner in jest-runner.

Makes prettier optional for inline snapshots, falling back to string replacement.

Runs transforms over snapshotResolver in jest-snapshot.

Stops exporting ScriptTransformer class and instead exports async function createScriptTransformer.

requireAndTranspileModule always returns a Promise and its third parameter is now RequireAndTranspileModuleOptions.

createTranspilingRequire now returns a function that returns a Promise.

Revises expect.not.objectContaining() to be the inverse of expect.objectContaining(), as documented.

Makes toContain more strict about the received type.

matcherResult on JestAssertionError is now strings rather than functions.

Uses only named exports in jest-diff.

Ignores excess words in jest-each headings.

Drops support for runScript for test environments.

Converts jest-get-type to an ES Module.

Stops injecting the global variable into the module wrapper.

Refactors the transform API to pass an options bag instead of multiple boolean options.

Refactors transformer API to pass an options bag rather than separate config and other options.

Switches jest-worker to named exports.

Converts pretty-format to ES Modules.

Adds an exports field to all package.json files.

Migrates babel-jest to ESM.

Replaces the TestScheduler export with createTestScheduler.

Moves root into config and makes GlobalConfig a mandatory parameter for getConsoleOutput.

Migrates jest-haste-map to ESM.

Migrates jest-jasmine2 to ESM.

Moves the jest-runtime CLI into jest-repl.

Migrates jest-resolve to ESM.

Migrates jest-resolve-dependencies to ESM.

Makes node-notifier a peer dependency of jest-reporters.

Uses Maps instead of objects for all cached resources in jest-resolve and jest-runtime.

Migrates jest-runner to ESM.

jest-circus now fails tests when multiple done() calls are made.

jest-circus and jest-jasmine2 fail the test instead of warning when describe returns a value.

Sets exit code to 1 if test logs after teardown in jest-runner.

Disallows return values other than a Promise from hooks and tests.

Disallows mixing a done callback and returning a Promise from hooks and tests.

Migrates jest-mock to ESM.

Allows node-notifier@10 as a peer dependency of @jest/reporters.

Drops support for non-LTS Node versions, supporting only Node LTS releases and Node 15.

Marks deprecated configuration options as @deprecated in @jest/types.