🚨 Breaking Changes

• Don't lookup config file from ancestor directories  -  by @hi-ogawa, Codex and Hiroshi Ogawa in #10428 (945d9)
• Inline @vitest/runner package, do not publish it anymore  -  by @sheremet-va in #10511 (6d6e4)
• Allow mutating happy-dom/jsdom window object  -  by @hi-ogawa, Hiroshi Ogawa and Codex in #10373 (206e8)
• Expose concurrencyId/workerId on TestModule's diagnostics, make id 1-based  -  by @sheremet-va in #10516 (bdd98)
• browser: Require sessionId for orchestrator html request  -  by @hi-ogawa, Hiroshi Ogawa and Codex in #10522 (79b7d)
• coverage: Allow thresholds.perFile to accept an object  -  by @vladlenskiy and @AriPerkkio in #10190 (13b78)

   🚀 Features

• browser: Display nested mark trace in UI  -  by @hi-ogawa, Hiroshi Ogawa and Codex in #10437 (86ffc)
• cli: Add --repeats CLI option  -  by @todor-a in #10504 (ee48b)
• coverage: thresholds.autoUpdate to receive previous threshold as argument  -  by @wouterkroes in #10495 (04f81)

   🐞 Bug Fixes

• Fix mixed stdout/stderr log timestamps in onUserConsoleLog  -  by @Copilot, Hiroshi Ogawa, @hi-ogawa and @sheremet-va in #10308 (62756)
• Fix importOriginal with optimizer and query import  -  by @davidhwilliams, David Harris, @hi-ogawa, Hiroshi Ogawa and Codex in #10469 (6a3bb)
• Correct transform time calculation in merged report  -  by @potatomatoooo and @hi-ogawa in #10570 and #10578 (b7897)
• browser:
  • Wait for orchestrator readiness before resolving browser sessions  -  by @soconnor-seeq in #10397 (fe5ed)
  • Wait for iframe tester readiness before preparing  -  by @soconnor-seeq in #10497 (f2655)
  • Encode iframeId in tester iframe URL  -  by @Pduhard, Pduhard and Claude Opus 4.8 (1M context) in #10520 and #10521 (c8bf1)
• coverage:
  • Avoid matching sibling project roots  -  by @innoprej, Shin JaeHee and @AriPerkkio in #10311 (e30dd)
• mocker:
  • Hoist vi.mock() for vite-plus/test imports  -  by @Brooooooklyn and Claude Opus 4.8 (1M context) in #10489 (88376)
• pool:
  • Prevent test run hang on worker crash  -  by @jaxalo and @AriPerkkio in #10543 (40878)
• vitest:
  • Strip non-serializable functions from inline diff config  -  by @DucMinhNe in #10573 (5b81a)

    View changes on GitHub

🐞 Bug Fixes

• Fix importOriginal with optimizer and query import [backport to v4] - by Hiroshi Ogawa, David Harris, Codexand Vladimir in #10546 (a5180)
• browser:
  • Wait for orchestrator readiness before resolving browser sessions [backport to v4] - by Vladimir and Séamus O'Connor in #10555 (7fb29)
  • Wait for iframe tester readiness before preparing [backport to v4] - by Vladimir and Séamus O'Connor in #10497 and #10556 (fbc62)
• mocker:
  • Hoist vi.mock() for vite-plus/test imports [backport to v4] - by Hiroshi Ogawa, LongYinan, Claude Opus 4.8 and Vladimir in #10548 (2c955)
• pool:
  • Prevent test run hang on worker crash [backport to v4] - by Ari Perkkiö and Jattioui Ismail in #10543 and #10564 (934b0)

View changes on GitHub

   🚨 Breaking Changes

• Throw an error if hoistable methods are outside the top level scope  -  by @sheremet-va in #10460 (d0b4f)
• toHaveTextContent is strict, add toMatchTextContent as alternative  -  by @sheremet-va in #10473 (18f30)
• benchmark: Rewrite the public API  -  by @sheremet-va in #10113 (19f6e)
• browser: Enable locators.exact by default  -  by @sheremet-va in #10430 (e2032)

   🚀 Features

• browser: Show trace view steps in editor panel  -  by @hi-ogawa and Codex in #10404 (8c4b6)
• reporter: Support html reporter single file output  -  by @hi-ogawa, Codex and Claude Opus 4.7 (1M context) in #10235 (f757e)

   🐞 Bug Fixes

• Preserve vi.defineHelper callsite for async error stack  -  by @macayu17 and @hi-ogawa in #10415 (ac697)
• Respect disableConsoleIntercept in browser mode  -  by @Copilot, hi-ogawa, @hi-ogawa and Codex in #10391 (66110)
• ForceRerunTriggers uses directory globs against files  -  by @Patrick-Clausen and Patrick Clausen in #10421 and #10420 (4fee2)
• Unify typechecking and ast collection  -  by @sheremet-va in #10449 (af993)
• Don't print typecheck warning more than once  -  by @sheremet-va in #10461 (15275)
• Correct collumn when parsing tests  -  by @sheremet-va in #10467 (7c2fc)
• browser:
  • Fix stale source map on watch mode  -  by @hi-ogawa in #10389 (6d772)
  • Escape inline orchestrator scripts  -  by @hi-ogawa and Codex in #10412 (c22cf)
  • Disable client cdp API when allowWrite/allowExec: false  -  by @hi-ogawa and Codex in #10444 (63e3b)
• mocker:
  • Skip hoist transform without ast mock calls  -  by @hi-ogawa and Codex in #10410 (0468e)
• ui:
  • Fix module graph in browser mode with --ui  -  by @hi-ogawa in #10386 (3003c)
  • Render ANSI color codes in editor panel inline error widget  -  by @Copilot, hi-ogawa and @hi-ogawa in #10418 (766b8)
• webdriverio:
  • Allow gpu in headless chrome  -  by @rotempasharel1 in #10376 (f310a)

   🏎 Performance

• Improve performance in hot paths  -  by @sheremet-va in #10446 (03faf)

    View changes on GitHub

   🐞 Bug Fixes

• browser:
  • Disable client cdp API when allowWrite/allowExec: false [backport to v4]  -  by @hi-ogawa and Codex in #10450 (e4067)
  • Remove orphaned Playwright route when same module is mocked via multiple ids [backport to v4]  -  by @toxik and @Zelys-DFKH in #10474 (675b4)

    View changes on GitHub

   🐞 Bug Fixes

• Pin last supported vite-node version  -  by @sheremet-va (16f12)

    View changes on GitHub

   🚀 Features

• api: Add allowWrite and allowExec options to api [backport to v3]  -  by @hi-ogawa and Codex in #10445 (af88b)

   🐞 Bug Fixes

• browser: Disable client cdp API when allowWrite/allowExec: false [backport to v3]  -  by @hi-ogawa and Codex in #10456 (385a1)

    View changes on GitHub

   🚨 Breaking Changes

• Require Node.js 22 and Vite 6.4  -  by @sheremet-va in #10178 (38762)
• Fail expect.poll when function didn't resolve in time  -  by @hi-ogawa and Codex in #10233 (4df04)

   🚀 Features

• Support typescript build mode  -  by @lishaduck in #9870 (106da)
• api:
  • Expose logs recorded during the test  -  by @sheremet-va in #10277 (cba20)
• browser:
  • Show aria tree on locator element error  -  by @hi-ogawa and Codex in #10257 (04f04)
  • Support custom kind in page.mark  -  by @AriPerkkio in #10302 (053e8)
  • Live update trace view on watch UI  -  by @hi-ogawa and Codex in #10296 (78c11)
  • Add context.mark for custom command tracing  -  by @AriPerkkio in #10329 (aa514)

   🐞 Bug Fixes

• Shell injection safety via github.ref_name in publish workflow  -  by @lloyd-c137 and lloyd-c137 in #10327 (dd020)
• Make attachmentsDir root only config  -  by @hi-ogawa and Codex in #10334 (fab1b)
• Apply cjs interop for truthy __esModule  -  by @hi-ogawa in #10363 (2b135)
• browser:
  • Simplify orchestrator otel carrier  -  by @hi-ogawa in #10283 (3514f)
  • Remove orphaned Playwright route when same module is mocked via multiple ids  -  by @Zelys-DFKH in #9957 and #10267 (41db6)
  • Skip wrapDynamicImport transform on ssr environment  -  by @hi-ogawa in #10355 (d3c96)
• cli:
  • Respect FORCE_COLOR over agent detection  -  by @dokson in #10272 (7e66b)
• coverage:
  • exclude to not inherit negation globs from test.include  -  by @AriPerkkio in #10299 (28685)
• deps:
  • Update fake-timers to 15.3.2. support toNotFake  -  by @BPScott, @hi-ogawa and Codex in #10043 (bbf2f)
• expect:
  • Allow readonly arrays and sets in toBeOneOf  -  by @YBJ0000 in #10264 and #10374 (fed11)
• junit:
  • Include unhandled errors in JUnit XML report  -  by @gbleu and Claude Sonnet 4.6 in #10244 (6f74e)
• reporter:
  • Guard against non-finite slowTestThreshold in summary reporter  -  by @OfekDanny, Ofek Danny, Claude Sonnet 4.6 and @AriPerkkio in #10202 (f362f)
  • Fix non-existing import subpath module blob serialization  -  by @hi-ogawa in #10318 (29cb0)
• reporters:
  • Fix blob file name with label  -  by @hi-ogawa in #10346 (c5e2e)
  • summary to intercept logger's streams even when they are not process.std* streams  -  by @AriPerkkio in #10340 (f79e7)
  • Fix missing testModules in onTestRunEnd when merging blobs from different root directory test runs  -  by @hi-ogawa and Codex in #10348 (745b3)
• runner:
  • Remove AbortSignal listener leak in withCancel  -  by @tomohiro86 and @AriPerkkio in #10265 (ab098)
• ui:
  • Fix duplicate colored error message  -  by @hi-ogawa and Codex in #10258 (035e3)
  • Fix missing source code in html reporter metadata when merging blobs with different root directory test runs  -  by @hi-ogawa and Codex in #10338 (4f7c2)

   🏎 Performance

• Stringify diff objects only once  -  by @sheremet-va in #10276 (d006a)
• browser: Reduce matching screenshot overhead  -  by @kasperpeulen in #10278 (511c0)

    View changes on GitHub

   🐞 Bug Fixes

• runner: Limit concurrency per task branch in addition to per leaf callbacks (backport)  -  by @hi-ogawa in #10384 (4f0f2)

    View changes on GitHub

   🐞 Bug Fixes

• browser: Provide project reference in ToMatchScreenshotResolvePath  -  by @macarie and @sheremet-va in #10138 (31882)
• Global sequence.concurrent: true with top-level test(..., { concurrent: false }) + depreacte sequential test API and options  -  by @hi-ogawa, Codex and @sheremet-va in #10196 (2847d)
• browser: Simplify orchestrator otel carrier  -  by @hi-ogawa in #10285 (18af9)

   🏎 Performance

• Stringify diff objects only once  -  by @sheremet-va in #10276 (9f7b1)

    View changes on GitHub

   🚨 Breaking Changes

• Default attachmentsDir from .vitest-attachements/ to .vitest/attachments/  -  by @MdSadiqMd in #10186 (1ba73)
• Remove sequential test/suite options in favor of concurrent  -  by @hi-ogawa and Codex in #10198 (9229f)
• Represent locator as an object instead of a string  -  by @sheremet-va in #10212 (80f07)
• Inline expect package  -  by @sheremet-va in #10221 (ad162)
• Remove deprecated entry points  -  by @sheremet-va in #10222 (994c6)
• mocker: Deserialize automock as automock  -  by @nami8824 in #10192 (2f892)
• reporters: blob reporter and --merge-reports default to .vitest/blob/  -  by @AriPerkkio in #10232 (d22b0)

   🚀 Features

• Expose default reporters through configDefaults.reporters  -  by @hi-ogawa and Claude Sonnet 4.6 in #10219 (083f6)
• Support merge reports for non-sharded multi-environment runs (take 2)  -  by @hi-ogawa, Claude Sonnet 4.6, Codex and @AriPerkkio in #10031 (e60b2)
• Add logger.formatError  -  by @hi-ogawa and Codex in #10268 (2c5f3)
• browser: Provide project reference in ToMatchScreenshotResolvePath  -  by @macarie and @sheremet-va in #10138 (16654)
• coverage: V8 to track node:child_process and node:worker_threads contexts  -  by @AriPerkkio in #9976 (9baa5)
• junit-reporter: Add jest-junit-compatible naming options  -  by @neumaennl, neumaennl, @neumann4soft and Copilot in #10189 (27393)

   🐞 Bug Fixes

• Global sequence.concurrent: true with top-level test(..., { concurrent: false }) + depreacte sequential test API and options  -  by @hi-ogawa, Codex and @sheremet-va in #10194 (9387f)
• Test tags options should overwrite inherited suite options + inherit suite options in task API  -  by @hi-ogawa and Codex in #10216 (457db)
• Udpate optimize deps config  -  by @sheremet-va in #10223 (95dc6)
• browser:
  • Fix trace highlight of shadow dom on webdriverio  -  by @hi-ogawa in #10227 (b01af)
• deps:
  • Update ivya to fix empty aria tree snapshot  -  by @hi-ogawa in #10218 (f7822)
• runner:
  • Propagate chainable flags in describe.for  -  by @DORI2001, Dor Alagem and @hi-ogawa in #10187 (db678)
  • Limit concurrency per task branch in addition to per leaf callbacks  -  by @hi-ogawa in #10179 (3112a)
• snapshot:
  • Treat empty string as valid snapshot  -  by @mayrang and @hi-ogawa in #10188 (e145d)
• spy:
  • Support private method spy types  -  by @cyphercodes in #10172 and #10213 (628ab)

    View changes on GitHub