v28.0.0-alpha.1

Features

• [babel-jest] Export createTransformer function (#12399)
• [expect] Expose AsymmetricMatchers, MatcherFunction and MatcherFunctionWithState interfaces (#12363, #12376)
• [jest-config, @jest/types] Add ci to GlobalConfig (#12378)
• [@jest/schemas] New module for JSON schemas for Jest's config (#12384)

Fixes

• [jest-config] Correctly detect CI environment and update snapshots accordingly (#12378)
• [jest-config] Pass moduleTypes to ts-node to enforce CJS when transpiling (#12397)

Chore & Maintenance

• [docs, examples] Update React examples to match with the new React guidelines for code examples (#12217)
• [docs] Add note about not mixing done() with Promises (#11077)
• [jest-serializer] [BREAKING] Deprecate package in favour of using v8 APIs directly (#12391)

New Contributors

• @marcelltoth made their first contribution in #12290
• @soryy708 made their first contribution in #12010
• @dmitryvinn-fb made their first contribution in #12379
• @cola119 made their first contribution in #12375
• @holylander made their first contribution in #12257
• @jsjoeio made their first contribution in #11077

Full Changelog: v28.0.0-alpha.0...v28.0.0-alpha.1