🚨 Breaking Changes

• Add screenshotDirectory config to browser.expect.toMatchScreenshot  -  by @macarie in #10592 (a60de)
• Update @sinonjs/fake-timers and support mocking Temporal  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10654 (f8b15)
• Remove webdriverio package  -  by @sheremet-va in #10675 (5fed6)
• Clear mocks by default before each test  -  by @sheremet-va in #10613 (0f646)
• Don't emit localStorage warnings on Node 26, fail gracefully when worker fails to start  -  by @sheremet-va in #10293 (334ed)
• reporters:
  • Write json and junit reporter output files to .vitest by default  -  by @hi-ogawa, Hiroshi Ogawa, OpenCode (claude-opus-4-8) and @AriPerkkio in #10621 (58577)
• ui:
  • Harden UI API access  -  by @hi-ogawa, Hiroshi Ogawa and Codex in #10583 (4c26d)
  • Change html reporter default output to .vitest  -  by @hi-ogawa and Hiroshi Ogawa in #10620 (29c36)

   🚀 Features

• vitest: Create vi.when()  -  by @macarie in #10174 (3900e)

   🐞 Bug Fixes

• Fix setImmediate await in detect-async-leak  -  by @hi-ogawa and Hiroshi Ogawa in #10608 (dd62b)
• Fix per-project sequence config  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10659 (40cdc)
• Add handshake timeout to iframe communication  -  by @sheremet-va in #10656 (3545f)
• Don't print column in test names when includeTaskLocation is enabled  -  by @sheremet-va in #10681 (bd9cc)
• browser:
  • Always derive a positive locator action timeout  -  by @sheremet-va in #10626 (5b864)
  • Resize the browser ui only if it's not headless  -  by @sheremet-va in #10662 (b5c61)
  • Check fs access in builtin commands  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10674 (33f96)
• coverage:
  • Non-awaited module imports cause wrong offsets  -  by @AriPerkkio in #10643 (c4090)
  • Fail fast when coverage.reportsDirectory conflicts between concurrent runs  -  by @jgamaraalv and @AriPerkkio in #10466 (833f0)
• pool:
  • Improve error message when worker exits unexpectedly  -  by @filmaj and @AriPerkkio in #10587 (76139)
• types:
  • Allow changed in configuration options  -  by @AriPerkkio in #10651 (0da12)
• vm:
  • Fix external module resolve error with deps optimizer query for encoded URI  -  by @SveLil in #10658 (90c4e)

    View changes on GitHub

   🐞 Bug Fixes

• browser: Check fs access in builtin commands [backport to v4]  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10680 (5c18d)
• vm: Fix external module resolve error with deps optimizer query for encoded URI [backport to v4]  -  by @SveLil and @hi-ogawa in #10661 (bae52)

    View changes on GitHub

   🐞 Bug Fixes

• browser: Check fs access in builtin commands [backport to v3]  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10679 (b795e)

    View changes on GitHub

   🚨 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