# Vitest v4.0.0 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v4.0.0
- **Released:** Oct 22, 2025
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v4.0.0/
## Executive Summary (TL;DR)
Vitest v4.0.0. Source highlight: To stay updated, read our blog post and check the migration guide.
## Breaking Changes & Deprecations
- 🚨 Breaking Changes - Remove `'basic'` reporter - by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/7884 [(82fcf)](https://github.com/vitest-dev/vitest/commit/82fcf5d53)
## New Features
- Verbose reporter prints tests in a list, introduce `tree` reporter - by @sheremet-va and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/8500 (25fd3)
- Provide entity to onConsoleLog - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8159 (437d4)
- Add `onUnhandledError` callback - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8162 (924cb)
- Add spy option to vi.mockObject - by @rChaoz in https://github.com/vitest-dev/vitest/issues/8285 (81d76)
- Don't use vite-node in coverage packages - by @sheremet-va (ffdb4)
- Clickable dashboard numbers - by @shairez in https://github.com/vitest-dev/vitest/issues/7406 (2344c)
## Improvements
- Avoid spawning extra workers if no tests will run there - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8446 (3fb3e)
- Don't set `process.title` - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8453 (0a766)
- Remove chai as a direct dependency, keep it in `@vitest/expect` - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8461 (cc98c)
- Reduce the amount of dynamic imports - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8465 (db6cd)
- Delay populating node-globals - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8506 (41cbc)
- Get `workerId` from a global object - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8507 (46b13)
## Bug Fixes
- Allow overriding globals in types - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8215 (2248b)
- Remove unused dependencies - by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/8184 (feadc)
- Distribute test files to shards more evenly - by @Shinyaigeek and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/8288 (7b489)
- Use suite's timeout when `test.extend` - by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/8278 (43977)
- Support snapshot with no object key sorting - by @hi-ogawa and @sheremet-va in https://github.com/vitest-dev/vitest/issues/8136 (e85e3)
- Annotation location always points to the test file - by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8315 (88071)