Vitest Release Notes

🐞 Bug Fixes

Isolate result.status between repeats runs - by @hi-ogawa, Hiroshi Ogawa and Codex (GPT-6) in #11218 (5dbeb)

Don't print an interceptor warning in browser mode - by @sheremet-va in #11377 (15cc0)

Don't retry when test.fails expectedly failed - by @hi-ogawa, Hiroshi Ogawa and Codex (GPT-6) in #11219 (b2458)

Scope cache key generators to projects - by @ecoyoung in #11281 and #11301 (92ba7)

browser:

Delay server listen until tests start running - by @sheremet-va in #11366 (7d8ed)

Check mock path boundaries - by @saryn17, Ryosei Sato and @sheremet-va in #11361 and #11362 (1c388)

Keep config of browser-consumed environments - by @kasperpeulen and Claude in #11378 (aafc0)

Ignore page crash while cancelling - by @sheremet-va in #11386 (7c367)

toMatchScreenshot uses wrong reference on retried tests - by @macarie in #11393 (c22ab)

cache:

Revalidate imports of cached modules - by @sheremet-va in #11381 (38f98)

deps:

Pin why-is-node-running to 3.2.1 to avoid users running into ERR_PNPM_TRUST_DOWNGRADE - by @AriPerkkio in #11403 (f6c9a)

expect:

Pass current equality testers to expect.extend asymmetric matchers - by @hi-ogawa, Hiroshi Ogawa and Claude in #11401 (3e794)

jsdom:

Support Blob on jsdom 30.1 - by @sheremet-va in #11379 (6c49b)

pool:

Preserve unique pool ids when groupOrder is set - by @mtorp in #11392 (50312)

ui:

Split-pane handle overlapping iframe - by @macarie in #11221 (f91db)

vitest:

Remove root temp dir on close - by @abhinav-phi in #11248 (7c711)

vm:

Do not optimize deps from index.html - by @ezefernandezyf, Hiroshi Ogawa and Codex (GPT-6) in #11329 and #11360 (caf28)

Don't reuse scripts across vite environments - by @MO2k4, Martin Oehlert and Claude in #11395 (346d3)

View changes on GitHub

Original source

🐞 Bug Fixes

Bind process in case global is overwritten - by @AriPerkkio in #11343 (0b792)

detect-async-leaks:

Ignore process.stdio handles - by @AriPerkkio in #11333 (0fd6b)

expect:

Fix toMatchObject with asymmetric matchers - by @ShreeBohara, Claude Opus 5, @hi-ogawa, Hiroshi Ogawa and Codex (GPT-5) in #11100 (42523)

jsdom:

Fix Request with Blob body on jsdom 28+ - by @harshit-d3v in #11295 (d1c3e)

reporter:

agent to respect --silent - by @Raj4478 and @AriPerkkio in #11271 (5b95e)

reporters:

Handle concurrent createReport calls - by @7rulnik in #11278 (e8e55)

hanging-process to use ESM entrypoint - by @AriPerkkio in #11316 (4e91e)

spy:

Fix stack overflow when spying Set.prototype.add - by @fengmk2 in #11299 (a0a93)

ui:

Persist authentication cookie beyond current browser session - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11066 (f8819)

View changes on GitHub

Original source

Features

ui

Move trace attempts selector to viewer header - by @hi-ogawa, Hiroshi Ogawa and Codex in #11189 (5dc4b)

Add focused trace view layout mode - by @hi-ogawa, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and Codex in #11190 (376dc)

Bug Fixes

Exit 1 when vitest list fails collection - by @hamed-bavar in #11145 and #11146 (6108b)

Keep parse error details in static collection - by @hamed-bavar in #11150 and #11151 (7c818)

Avoid recursive prototype in automocking - by @sheremet-va in #11195 (99fc5)

Prevent false Vitest import resolution - by @sheremet-va in #11196 (b426c)

Keep metadata file when clearing the cache - by @sheremet-va in #11199 (73614)

Correct typos in error message and comments - by @shinji00222 and Shinji in #11187 (115c3)

Resolve ResolvedConfig exactOptionalPropertyTypes errors - by @LukeAbby in #11175 (498fb)

Share the server on self-referencing extends - by @sheremet-va in #11034 (23dda)

Warn when deprecated deps.optimizer.web is used - by @im10furry in #11214 (2ce29)

browser

Avoid double quotes in config.define - by @sheremet-va in #11198 (972e2)

doctor

Measure vm pools for custom environments - by @sheremet-va in #11212 (91ab1)

expect

Correct return value in toMatchAriaSnapshot - by @sheremet-va in #11208 (c119b)

fakeTimers

Force queueMicrotask and nextTick in toNotFake - by @kingmakeruix, kingmakeruix, Hiroshi Ogawa, Codex and @hi-ogawa in #11261 (a47d7)

snapshot

Report obsolete keys next to skipped tests - by @hamed-bavar, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11157 and #11158 (17e2b)

types

Make public declarations self-contained - by @ZoeySigel in #11141 (45546)

ui

Fix collapse/expand suite with file name search - by @hi-ogawa, Hiroshi Ogawa and Codex in #11260 (0a712)

Fix explorer file summary count - by @hi-ogawa, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and Codex in #11125 (05982)

utils

Fix deepMerge to handle prototype - by @hi-ogawa, Hiroshi Ogawa and Codex in #11215 (4944c)

View changes on GitHub

Original source

Vitest 5 is officially out!

This release focuses on performance and brings a lot of new features while fixing long-standing bugs. See our blog post for the official announcement.

🚨 Breaking Changes

• Replace loupe.inspect with pretty-format - by @hi-ogawa, Claude Opus 5 (1M context) and OpenAI Codex in #9609 (3f802)
• Remove quotes from string values in test.for/each title $ variable (take 2) - by @hi-ogawa in #10170 (04d37)
• 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 OpenAI 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)
• 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 OpenAI Codex in #10233 (4df04)
• 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)
• Don't lookup config file from ancestor directories - by @hi-ogawa, OpenAI 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 OpenAI Codex in #10373 (206e8)
• Expose concurrencyId/workerId on TestModule's diagnostics, make id 1-based - by @sheremet-va in #10516 (bdd98)
• 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 (gpt-5.6-sol) 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)
• Separate config resolution from the server creation - by @sheremet-va in #10554 (1c0ec)
• Inline projects extend the root config by default - by @sheremet-va in #10750 (fec00)
• Enable mocking Temporal without fake timers - by @fabon-f, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10757 (ac2d4)
• Support nested projects - by @sheremet-va in #10846 (ec367)
• Use > as separator in -t, calculate only once - by @sheremet-va in #10686 (a0b20)
• Fail the test when an asynchronous assertion is not awaited - by @sheremet-va in #10868 (86d4a)
• Share the Vite server between inline projects - by @sheremet-va in #10848 (d87c9)
• Parse files statically in vitest list by default - by @sheremet-va in #11088 (51e94)

benchmark:

• Rewrite the public API - by @sheremet-va in #10113 (19f6e)

browser:

• Iframe scale - by @macarie in #9745 (b6398)
• Enable locators.exact by default - by @sheremet-va in #10430 (e2032)
• Require sessionId for orchestrator html request - by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in #10522 (79b7d)
• Save failure screenshots in attachmentsDir - by @macarie in #10917 (3b5bb)

coverage:

• include/exclude globs too eager - by @AriPerkkio in #9818 (edacb)
• Allow thresholds.perFile to accept an object - by @vladlenskiy and @AriPerkkio in #10190 (13b78)

expect:

• Fix toThrow("") behavior by reverting #6710 - by @hi-ogawa in #9643 and #6710 (6c3e4)

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)
• Write json and junit reporter output files to .vitest by default - by @hi-ogawa, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @AriPerkkio in #10621 (58577)

spy:

• Preserve class mock prototype methods on instances - by @sheremet-va in #10910 (6093d)

types:

• Add better promise support in expects and matchers - by @samchungy and @sheremet-va in #8266 (41f55)

ui:

• Harden UI API access - by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in #10583 (4c26d)
• Change html reporter default output to .vitest - by @hi-ogawa and Hiroshi Ogawa in #10620 (29c36)

🚀 Features

• Add createReport and .vitest report directory convention - by @AriPerkkio in #9993 (72a6d)
• Expose default reporters through configDefaults.reporters - by @hi-ogawa and Claude Opus 5 (1M context) in #10219 (083f6)
• Support merge reports for non-sharded multi-environment runs (take 2) - by @hi-ogawa, Claude Opus 5 (1M context), OpenAI Codex and @AriPerkkio in #10031 (e60b2)
• Add logger.formatError - by @hi-ogawa and OpenAI Codex in #10268 (2c5f3)
• Support typescript build mode - by @lishaduck in #9870 (106da)
• Add toggable injectCjsGlobals option - by @sheremet-va in #10709 (82671)
• Promote fsModuleCache to a top-level option - by @sheremet-va in #10734 (78ed7)
• Support non-ascii characters in for/each title placeholders - by @k-yle in #10773 (15e0a)
• Report the duration breakdown as percentages - by @sheremet-va and @AriPerkkio in #10820 (c67d2)
• Promote parseSpecifications out of experimental - by @sheremet-va in #11087 (b628c)
• Promote clearCache out of experimental - by @sheremet-va in #11086 (d4fe1)

api:

• Expose logs recorded during the test - by @sheremet-va in #10277 (cba20)

benchmark:

• Add pluggable benchmark provider API - by @GuillaumeLagrange and @sheremet-va in #10799 (86c70)

browser:

• Export aria tree utils - by @hi-ogawa in #10171 (c3423)
• Support dom snapshot trace view - by @hi-ogawa, Claude Opus 5 (1M context) and OpenAI Codex in #10102 (7eddd)
• Provide project reference in ToMatchScreenshotResolvePath - by @macarie and @sheremet-va in #10138 (16654)
• Show aria tree on locator element error - by @hi-ogawa and OpenAI 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 OpenAI Codex in #10296 (78c11)
• Add context.mark for custom command tracing - by @AriPerkkio in #10329 (aa514)
• Show trace view steps in editor panel - by @hi-ogawa and OpenAI Codex in #10404 (8c4b6)
• Display nested mark trace in UI - by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in #10437 (86ffc)

cli:

• Add --repeats CLI option - by @todor-a in #10504 (ee48b)
• Support -p shorthand for --project - by @sheremet-va in #10826 (1addd)

coverage:

• V8 to track node:child_process and node:worker_threads contexts - by @AriPerkkio in #9976 (9baa5)
• thresholds.autoUpdate to receive previous threshold as argument - by @wouterkroes in #10495 (04f81)
• Switch to @vitest/istanbuljs packages - by @AriPerkkio in #11053 (5f6a5)

junit-reporter:

• Add jest-junit-compatible naming options - by @neumaennl, neumaennl, Martin Neumann and Copilot in #10189 (27393)

reporter:

• Support html reporter single file output - by @hi-ogawa, OpenAI Codex and Claude Opus 5 (1M context) in #10235 (f757e)
• Add custom GitHub Actions summary title - by @heyJonBray and @macarie in #10891 (4363c)

ui:

• Highlight editor source locations - by @sheremet-va, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11004 (bce2d)
• Navigate trace steps with keyboard and remove indirect editor focus - by @sheremet-va, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11005 (6816f)
• Persist trace view selection in URL - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10981 (3069e)
• Toggle trace target highlight - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11049 (cd63e)
• Add link to open playwright trace - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11059 (58f02)

vitest:

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

vm:

• Support require(esm) in vm pools - by @sheremet-va in #10829 (01298)

🐞 Bug Fixes

• Global sequence.concurrent: true with top-level test(..., { concurrent: false }) + depreacte sequential test API and options - by @hi-ogawa, OpenAI 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 OpenAI Codex in #10216 (457db)
• Udpate optimize deps config - by @sheremet-va in #10223 (95dc6)
• 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 OpenAI Codex in #10334 (fab1b)
• Apply cjs interop for truthy __esModule - by @hi-ogawa in #10363 (2b135)
• Preserve vi.defineHelper callsite for async error stack - by @macayu17 and @hi-ogawa in #10415 (ac697)
• Respect disableConsoleIntercept in browser mode - by @Copilot, Hiroshi Ogawa, @hi-ogawa and OpenAI 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)
• 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 @davidxharris, David Harris, @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in #10469 (6a3bb)
• Correct transform time calculation in merged report - by @potatomatoooo and @hi-ogawa in #10570 and #10578 (b7897)
• 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 (gpt-5.6-sol) 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)
• Disable server HMR before plugins read it in their config hook - by @sheremet-va in #10731 (e060b)
• Close the pool before the Vite servers - by @sheremet-va in #10725 (96fa6)
• Remove listeners in the typecheck worker's off - by @sheremet-va in #10741 (d758b)
• Keep per-file isolation in vm pools when maxWorkers is 1 - by @sheremet-va in #10743 (83ab9)
• Node.js 20 deprecation warning for ci.yml - by @hirehamir in #10759 (2127f)
• Prevent node builtins double prefix - by @malobre in #10630 and #10767 (22d35)
• Set non-zero exit code when teardown throws during close - by @zakcutner and @AriPerkkio in #10794 (22116)
• Don't race the typechecker spawn grace period on windows - by @xevrion in #10814 (b19e5)
• Coalesce concurrent watch-mode restarts, deflake the pool stderr fixture - by @sheremet-va in #10822 (a31f8)
• Prevent vitest --typecheck from reporting a false success when the tsc process crashes - by @hitenkalda and Hiten Kalda in #10705 (a1b05)
• Collect in-source tests when the module is cached - by @koutaro-masaki in #10577 and #10589 (a7bf2)
• Swap replace() arguments so timeout error stack shows the real message - by @lazerg in #10875 (aba0f)
• Stale mock metadata breaks automocking with isolate:false - by @kade-robertson in #10145 and #10541 (8e210)
• Don't lose worker output on teardown, deflake timing-sensitive tests - by @sheremet-va in #10842 (1216b)
• Revive global concurrency limit for test lifecycle - by @hi-ogawa, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @sheremet-va in #10928 (cf917)
• Own the post-restart rerun, keep process.exit disabled in workers - by @sheremet-va in #10963 (5e69a)
• Preserve correct root during resolve config - by @AriPerkkio and @sheremet-va in #10909 (210ba)
• Combine multiple --project filters correctly - by @sheremet-va in #10988 (66c1c)
• Fix recordArtifact location with vi.defineHelper - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11047 (c2186)
• Invalidate resolved setup files - by @sheremet-va in #11073 and #11081 (488c0)
• Accept awaited value in vi.when thenResolve - by @sheremet-va in #11084 (c10a1)
• Ignore computed member calls in static collection - by @sheremet-va in #11085 (130f7)
• Don't duplicte oxc.target if user provides a custom array - by @sheremet-va in #11095 (848d7)
• Propagate --maxWorkers to projects - by @Gaurav1112 in #11102 (2122f)
• Apply queued mocks from doMock() in queue order - by @juliandescottes and Claude Opus 5 (1M context) in #10706 and #11127 (f08ce)
• Add a warning if inline project has duplicate plugins due to unexpected extends: true - by @sheremet-va in #11120 (584cf)
• Treat test.describe as a suite during static collection - by @sheremet-va in #11128 (d46a7)

browser:

• Fix trace highlight of shadow dom on webdriverio - by @hi-ogawa in #10227 (b01af)
• 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)
• Fix stale source map on watch mode - by @hi-ogawa in #10389 (6d772)
• Escape inline orchestrator scripts - by @hi-ogawa and OpenAI Codex in #10412 (c22cf)
• Disable client cdp API when allowWrite/allowExec: false - by @hi-ogawa and OpenAI Codex in #10444 (63e3b)
• 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 5 (1M context) in #10520 and #10521 (c8bf1)
• 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 (gpt-5.6-sol) in #10674 (33f96)
• Preserve pre-transform request defaults - by @sheremet-va in #10748 (b6060)
• Fix error stacktrace location off-by-one - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10724 (62b8d)
• Inlined awaited import should not trigger syntax error after transform - by @smeng9, Shaoyu Meng and Claude Opus 5 (1M context) in #10784 (51acd)
• Mock window.print to avoid hanging - by @aaravjaichand in #7375 and #10798 (66d95)
• Ignore channel events in a tester opened as a top-level window - by @simshanith in #9379 and #9381 (46a3c)
• Resolve connectTimeout from the project config - by @lazerg in #10879 and #10880 (62c79)
• Prebundle vite module runner with vitest - by @lebovvskii and @sheremet-va in #10836 and #10856 (37c24)
• Restore dependency reload warning - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10913 (90d69)
• Configure internal optimizer dependencies - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10915 (a72f4)
• Trigger playwright/chromium gc on lower disk availability - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10912 (032d3)
• Disallow filter-only options in getBy* locators - by Arjun in #10295 and #10933 (9b4df)
• Fail instead of hanging when the browser stops responding - by @sheremet-va in #10956 (c496c)
• Exit gracefully when the browser disconnects during cancellation - by @sheremet-va in #10962 (67e84)
• Don't redirect vitest in client environment - by @sheremet-va in #10975 (aeb67)
• Don't hang when ui: true in projects - by @AriPerkkio in #10994 (9f710)
• Preserve trace popover state - by @liuluochen6-af, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @hi-ogawa in #10906 and #11021 (1bbc2)
• Report the action error when a task times out - by @sheremet-va in #11101 (dc10f)

cache:

• Improve fsModuleCache resiliency during external modifications - by @jszumski in #10869 (5eb35)

cli:

• Respect FORCE_COLOR over agent detection - by @dokson in #10272 (7e66b)
• Exit on CTRL+c even when globalSetup runs blocked code - by @AriPerkkio in #10863 (d568f)

coverage:

• exclude to not inherit negation globs from test.include - by @AriPerkkio in #10299 (28685)
• Avoid matching sibling project roots - by @innoprej, Shin JaeHee and @AriPerkkio in #10311 (e30dd)
• 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)
• V8 to ignore Vite SSR's generated import bindings - by @AriPerkkio in #11023 (c6174)
• Prevent crash on /@fs/ prepended virtual files - by @AriPerkkio in #11119 (c4473)

deps:

• Update ivya to fix empty aria tree snapshot - by @hi-ogawa in #10218 (f7822)
• Update fake-timers to 15.3.2. support toNotFake - by @BPScott, @hi-ogawa and OpenAI Codex in #10043 (bbf2f)
• Update all non-major dependencies - by @sheremet-va in #9958 (7faa7)
• Update all non-major dependencies - by @sheremet-va in #10861 (0188c)
• Update all non-major dependencies - by @sheremet-va in #10898 (61c4b)
• Update all non-major dependencies - in #10966 (65263)
• Update all non-major dependencies - in #11043 (732df)

expect:

• Allow readonly arrays and sets in toBeOneOf - by @YBJ0000 in #10264 and #10374 (fed11)
• Handle nullish toHaveProperty values - by @liyimil in #10735 and #10811 (99e59)

junit:

• Include unhandled errors in JUnit XML report - by @gbleu and Claude Opus 5 (1M context) in #10244 (6f74e)

mocker:

• Skip hoist transform without ast mock calls - by @hi-ogawa and OpenAI Codex in #10410 (0468e)
• Hoist vi.mock() for vite-plus/test imports - by @Brooooooklyn and Claude Opus 5 (1M context) in #10489 (88376)
• Restrict redirect mocks to the fs allowlist - by @sheremet-va in #10972 (8ff9b)

pool:

• Prevent test run hang on worker crash - by @jaxalo and @AriPerkkio in #10543 (40878)
• Improve error message when worker exits unexpectedly - by @filmaj and @AriPerkkio in #10587 (76139)
• Vm pools to respect cgroupsv2 memory limit - by @milas in #10721 (3923c)
• Worker init to handle queued synchronous messages - by @lazerg and @AriPerkkio in #10932 (76096)
• Report the worker exit instead of a pipe error that raced it - by @sheremet-va in #10964 (59a03)

reporter:

• Guard against non-finite slowTestThreshold in summary reporter - by @OfekDanny, Ofek Danny, Claude Opus 5 (1M context) 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 OpenAI Codex in #10348 (745b3)
• Print parent describe suites when the passed-test list is hidden - by @ChihebBENCHEIKH1, Chiheb Bencheikh and @sheremet-va in #10606 and #10768 (658af)
• Display test.name in GitHub Actions reporter summary header - by @macarie in #10887 (49e24)

runner:

• Propagate chainable flags in describe.for - by @DoriAlagem, 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)
• Remove AbortSignal listener leak in withCancel - by @tomohiro86 and @AriPerkkio in #10265 (ab098)
• Don't fail collection when accessing error.stack throws - by @sheremet-va in #10839 (202e2)

snapshot:

• Fail test when snapshot assertion is used with test.fails - by @hi-ogawa in #10090 (e1aa7)
• Treat empty string as valid snapshot - by @mayrang and @hi-ogawa in #10188 (e145d)
• Support no-unsafe-eval CSP by evaluating snapshot files on server - by @hi-ogawa in #10665 (667c1)
• Reject when toMatchFileSnapshot uses same snapshot file as toMatchSnapshot - by @hi-ogawa, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @sheremet-va in #10978 (17646)

spy:

• Support private method spy types - by @cyphercodes in #10172 and #10213 (628ab)
• Point ESM namespace spy error to module mocking docs - by @ryandiginomad and Ryan Tang in #10707 (d6cec)

typecheck:

• Report a checker crash on Windows instead of a spawn failure - by @sheremet-va in #10907 (77aac)

types:

• Allow changed in configuration options - by @AriPerkkio in #10651 (0da12)

ui:

• Fix duplicate colored error message - by @hi-ogawa and OpenAI 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 OpenAI Codex in #10338 (4f7c2)
• 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, Hiroshi Ogawa and @hi-ogawa in #10418 (766b8)
• Fix code editor error and annotations gadgets layout shifts - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10969 (438ed)
• Synchronize watch-run UI state on file removal - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10941 (30c21)
• Require auth for coverage report and all UI subtree requests - by @sheremet-va in #10971 (5622f)
• Improve suite interaction and layout in explorer tree - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10970 (91231)
• Reveal explorer virtual scroller on resize - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #10998 (1f4fc)
• Persist trace step-iframe split pane sizes - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11027 (3cd01)
• Add suite level report view - by @dvmhmdsd, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @hi-ogawa in #11038 (602d2)
• Hide running count in static reports - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11123 (73d72)

utils:

• Don't crash on a malformed inline source map - by @lazerg, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @hi-ogawa in #10892 and #10893 (fe790)

vitest:

• Strip non-serializable functions from inline diff config - by @DucMinhNe in #10573 (5b81a)
• Remove broken "./src/*" export from package.json - by @sheremet-va in #10918 (2e5df)
• Render non-Error causes from env setup so the actual diagnostic is not dropped - by @spokodev in #10567 (b298d)

vm:

• Fix external module resolve error with deps optimizer query for encoded URI - by @SveLil in #10658 (90c4e)
• Stop retaining every finished test file in vm pool workers - by @sheremet-va in #10854 (38503)
• Fall back to compiling from source when a module's code cache is rejected - by @MarshallOfSound in #11031 (c3ba1)
• Link module graphs one at a time - by @sheremet-va in #11096 (3f2dd)

webdriverio:

• Allow gpu in headless chrome - by @rotempasharel1 in #10376 (f310a)

worker:

• Bind stdio's early in case overriden - by @AriPerkkio in #11020 (67ef7)

🏎 Performance

• Stringify diff objects only once - by @sheremet-va in #10276 (d006a)
• Improve performance in hot paths - by @sheremet-va in #10446 (03faf)
• Serve warm modules to workers in one round-trip, enable the node compile cache - by @sheremet-va in #10708 (b144a)
• Make the Node compile cache opt-in, persist worker caches on teardown - by @sheremet-va in #10742 (941bc)
• Reuse compiled code across vm pool contexts and prewarm the module graph - by @sheremet-va in #10744 (d8b04)
• Bundle vitest's own dependencies - by @sheremet-va in #10685 (c0508)
• Lowers peak memory usage when using --changed on a large graph - by @jszumski in #10866 (9f23f)
• Initialize trace view in the orchestrator once per worker - by @sheremet-va in #10984 (fad26)

browser:

• Reduce matching screenshot overhead - by @kasperpeulen in #10278 (511c0)
• Open browser sessions adaptively instead of maxWorkers upfront - by @sheremet-va in #10726 (6db8d)
• Cut per-file round trips - by @sheremet-va in #10730 (3feef)
• Stop serving framework sourcemaps in headless runs - by @sheremet-va in #10728 (6aefb)
• Prewarm the browser while the Vite server starts - by @sheremet-va in #10727 (c1767)
• Pre-bundle the vitest runtime in optimizeDeps - by @sheremet-va in #10713 (de631)
• Serve framework assets as immutable - by @sheremet-va in #10729 (7af87)

cache:

• Hash the environment-invariant part of the fs module cache key once - by @MarshallOfSound in #11029 (1d365)

coverage:

• Speed up v8 report generation (bounded-memory merge + precompiled globs) - by @toxik, Claude Opus 5 (1M context) and @AriPerkkio in #10506 (b05e5)
• Reduce RPC data and unnecessary serializations - by @AriPerkkio in #10781 (7e7e3)

expect:

• Avoid redefining matcher state - by @scttcper and OpenAI Codex in #11048 (58e71)
• Lazily format spy matcher failures - by @scttcper and OpenAI Codex in #11090 (e08c4)

spy:

• Avoid scanning cleared mocks - by @scttcper and OpenAI Codex in #11092 (2451e)

vm:

• Don't prewarm modules the worker never requests - by @MarshallOfSound and @sheremet-va in #11033 (1e9f8)
• Let environments opt out of the module graph prewarm - by @sheremet-va in #11078 (a6d5e)

View changes on GitHub

Original source

Breaking Changes

Parse files statically in vitest list by default - by @sheremet-va in #11088 (51e94)

Features

Promote clearCache out of experimental - by @sheremet-va in #11086 (d4fe1)

ui: Add link to open playwright trace - by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in #11059 (58f02)

Bug Fixes

Don't duplicte oxc.target if user provides a custom array - by @sheremet-va in #11095 (848d7)

Propagate --maxWorkers to projects - by @Gaurav1112 in #11102 (2122f)

browser: Report the action error when a task times out - by @sheremet-va in #11101 (dc10f)

ui: Add suite level report view - by @dvmhmdsd, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @hi-ogawa in #11038 (602d2)

vm: Link module graphs one at a time - by @sheremet-va in #11096 (3f2dd)

Performance

expect: Lazily format spy matcher failures - by @scttcper and Codex in #11090 (e08c4)

View changes on GitHub

Original source

Features

Promote parseSpecifications out of experimental - by @sheremet-va in #11087 (b628c)

coverage:

Switch to @vitest/istanbuljs packages - by @AriPerkkio in #11053 (5f6a5)

ui:

Highlight editor source locations - by @sheremet-va, Hiroshi Ogawa and OpenCode in #11004 (bce2d)

Navigate trace steps with keyboard and remove indirect editor focus - by @sheremet-va, Hiroshi Ogawa and OpenCode in #11005 (6816f)

Persist trace view selection in URL - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10981 (3069e)

Toggle trace target highlight - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #11049 (cd63e)

Bug Fixes

Combine multiple --project filters correctly - by @sheremet-va in #10988 (66c1c)

Fix recordArtifact location with vi.defineHelper - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #11047 (c2186)

Invalidate resolved setup files - by @sheremet-va in #11073 and #11081 (488c0)

Accept awaited value in vi.when thenResolve - by @sheremet-va in #11084 (c10a1)

Ignore computed member calls in static collection - by @sheremet-va in #11085 (130f7)

browser:

Don't hang when ui: true in projects - by @AriPerkkio in #10994 (9f710)

Preserve trace popover state - by @liuluochen6-af, Hiroshi Ogawa, OpenCode and @hi-ogawa in #10906 and #11021 (1bbc2)

coverage:

V8 to ignore Vite SSR's generated import bindings - by @AriPerkkio in #11023 (c6174)

deps:

Update all non-major dependencies - in #11043 (732df)

snapshot:

Reject when toMatchFileSnapshot uses same snapshot file as toMatchSnapshot - by @hi-ogawa, Hiroshi Ogawa, OpenCode and @sheremet-va in #10978 (17646)

ui:

Improve suite interaction and layout in explorer tree - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10970 (91231)

Reveal explorer virtual scroller on resize - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10998 (1f4fc)

Persist trace step-iframe split pane sizes - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #11027 (3cd01)

vm:

Fall back to compiling from source when a module's code cache is rejected - by @MarshallOfSound in #11031 (c3ba1)

worker:

Bind stdio's early in case overriden - by @AriPerkkio in #11020 (67ef7)

Performance

Initialize trace view in the orchestrator once per worker - by @sheremet-va in #10984 (fad26)

cache:

Hash the environment-invariant part of the fs module cache key once - by @MarshallOfSound in #11029 (1d365)

expect:

Avoid redefining matcher state - by @scttcper and Codex in #11048 (58e71)

vm:

Don't prewarm modules the worker never requests - by @MarshallOfSound and @sheremet-va in #11033 (1e9f8)

Let environments opt out of the module graph prewarm - by @sheremet-va in #11078 (a6d5e)

View changes on GitHub

Original source

🐞 Bug Fixes

Revive global concurrency limit for test lifecycle [backport to v4] - by @sheremet-va and @hi-ogawa in #10992 (5146d)

browser:

Encode iframeId in tester iframe URL [backport to v4] - by @sheremet-va, Pduhard and Claude Opus 4.8 in #10955 (10b2c)

Trigger playwright/chromium gc on lower disk availability [backport to v4] - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10951 (9851d)

mocker:

Restrict redirect mocks to the fs allowlist [backport to v4] - by @sheremet-va in #10974 (fe5a1)

View changes on GitHub

Original source

🚀 Features

reporter: Add custom GitHub Actions summary title - by @heyJonBray and @macarie in #10891 (4363c)

🐞 Bug Fixes

Revive global concurrency limit for test lifecycle - by @hi-ogawa, Hiroshi Ogawa, OpenCode (claude-opus-4-8) and @sheremet-va in #10928 (cf917)

Own the post-restart rerun, keep process.exit disabled in workers - by @sheremet-va in #10963 (5e69a)

Preserve correct root during resolve config - by @AriPerkkio and @sheremet-va in #10909 (210ba)

browser:

Trigger playwright/chromium gc on lower disk availability - by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10912 (032d3)

Disallow filter-only options in getBy* locators - by @arjun2075 in #10295 and #10933 (9b4df)

Fail instead of hanging when the browser stops responding - by @sheremet-va in #10956 (c496c)

Exit gracefully when the browser disconnects during cancellation - by @sheremet-va in #10962 (67e84)

Don't redirect vitest in client environment - by @sheremet-va in #10975 (aeb67)

deps:

Update all non-major dependencies - in #10966 (65263)

mocker:

Restrict redirect mocks to the fs allowlist - by @sheremet-va in #10972 (8ff9b)

pool:

Worker init to handle queued synchronous messages - by @lazerg and @AriPerkkio in #10932 (76096)

Report the worker exit instead of a pipe error that raced it - by @sheremet-va in #10964 (59a03)

reporters:

Display test.name in GitHub Actions reporter summary header - by @macarie in #10887 (49e24)

snapshot:

Support no-unsafe-eval CSP by evaluating snapshot files on server - by @hi-ogawa in #10665 (667c1)

ui:

Fix code editor error and annotations gadgets layout shifts - by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10969 (438ed)

Synchronize watch-run UI state on file removal - by @hi-ogawa, Hiroshi Ogawa and OpenCode (claude-opus-4-8) in #10941 (30c21)

Require auth for coverage report and all UI subtree requests - by @sheremet-va in #10971 (5622f)

utils:

Don't crash on a malformed inline source map - by @lazerg, Hiroshi Ogawa, OpenCode (claude-opus-4-8) and @hi-ogawa in #10892 and #10893 (fe790)

vitest:

Render non-Error causes from env setup so the actual diagnostic is not dropped - by @spokodev in #10567 (b298d)

View changes on GitHub

Original source

🚨 Breaking Changes

Inline projects extend the root config by default - by @sheremet-va in #10750 (fec00)

Enable mocking Temporal without fake timers - by @fabon-f, Hiroshi Ogawa and OpenCode in #10757 (ac2d4)

Support nested projects - by @sheremet-va in #10846 (ec367)

Use > as separator in -t, calculate only once - by @sheremet-va in #10686 (a0b20)

Fail the test when an asynchronous assertion is not awaited - by @sheremet-va in #10868 (86d4a)

Share the Vite server between inline projects - by @sheremet-va in #10848 (d87c9)

browser: Save failure screenshots in attachmentsDir - by @macarie in #10917 (3b5bb)

spy: Preserve class mock prototype methods on instances - by @sheremet-va in #10910 (6093d)

types: Add better promise support in expects and matchers - by @samchungy and @sheremet-va in #8266 (41f55)

🚀 Features

Report the duration breakdown as percentages - by @sheremet-va and @AriPerkkio in #10820 (c67d2)

cli: Support -p shorthand for --project - by @sheremet-va in #10826 (1addd)

vm: Support require(esm) in vm pools - by @sheremet-va in #10829 (01298)

🐞 Bug Fixes

Coalesce concurrent watch-mode restarts, deflake the pool stderr fixture - by @sheremet-va in #10822 (a31f8)

Prevent vitest --typecheck from reporting a false success when the tsc process crashes - by @hitenkalda and Hiten Kalda in #10705 (a1b05)

Collect in-source tests when the module is cached - by @koutaro-masaki in #10577 and #10589 (a7bf2)

Swap replace() arguments so timeout error stack shows the real message - by @lazerg in #10875 (aba0f)

Stale mock metadata breaks automocking with isolate:false - by @kade-robertson in #10145 and #10541 (8e210)

Don't lose worker output on teardown, deflake timing-sensitive tests - by @sheremet-va in #10842 (1216b)

browser:

Ignore channel events in a tester opened as a top-level window - by @simshanith in #9379 and #9381 (46a3c)

Resolve connectTimeout from the project config - by @lazerg in #10879 and #10880 (62c79)

Prebundle vite module runner with vitest - by @lebovvskii and @sheremet-va in #10836 and #10856 (37c24)

Restore dependency reload warning - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10913 (90d69)

Configure internal optimizer dependencies - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10915 (a72f4)

cache:

Improve fsModuleCache resiliency during external modifications - by @jszumski in #10869 (5eb35)

cli:

Exit on CTRL+c even when globalSetup runs blocked code - by @AriPerkkio in #10863 (d568f)

deps:

Update all non-major dependencies - by @sheremet-va in #9958 (7faa7)

Update all non-major dependencies - by @sheremet-va in #10861 (0188c)

Update all non-major dependencies - by @sheremet-va in #10898 (61c4b)

expect:

Handle nullish toHaveProperty values - by @liyimil in #10735 and #10811 (99e59)

reporters:

Print parent describe suites when the passed-test list is hidden - by @ChihebBENCHEIKH1, Chiheb Bencheikh and @sheremet-va in #10606 and #10768 (658af)

runner:

Don't fail collection when accessing error.stack throws - by @sheremet-va in #10839 (202e2)

spy:

Point ESM namespace spy error to module mocking docs - by @ryandiginomad and Ryan Tang in #10707 (d6cec)

typecheck:

Report a checker crash on Windows instead of a spawn failure - by @sheremet-va in #10907 (77aac)

vitest:

Remove broken "./src/*" export from package.json - by @sheremet-va in #10918 (2e5df)

vm:

Stop retaining every finished test file in vm pool workers - by @sheremet-va in #10854 (38503)

🏎 Performance

Lowers peak memory usage when using --changed on a large graph - by @jszumski in #10866 (9f23f)

browser: Serve framework assets as immutable - by @sheremet-va in #10729 (7af87)

View changes on GitHub

Original source

🚨 Breaking Changes

Separate config resolution from the server creation - by @sheremet-va in #10554 (1c0ec)

🚀 Features

Add toggable injectCjsGlobals option - by @sheremet-va in #10709 (82671)

Promote fsModuleCache to a top-level option - by @sheremet-va in #10734 (78ed7)

Support non-ascii characters in for/each title placeholders - by @k-yle in #10773 (15e0a)

benchmark: Add pluggable benchmark provider API - by @GuillaumeLagrange and @sheremet-va in #10799 (86c70)

🐞 Bug Fixes

Disable server HMR before plugins read it in their config hook - by @sheremet-va in #10731 (e060b)

Close the pool before the Vite servers - by @sheremet-va in #10725 (96fa6)

Remove listeners in the typecheck worker's off - by @sheremet-va in #10741 (d758b)

Keep per-file isolation in vm pools when maxWorkers is 1 - by @sheremet-va in #10743 (83ab9)

Node.js 20 deprecation warning for ci.yml - by @hirehamir in #10759 (2127f)

Prevent node builtins double prefix - by @malobre in #10630 and #10767 (22d35)

Set non-zero exit code when teardown throws during close - by @zakcutner and @AriPerkkio in #10794 (22116)

Don't race the typechecker spawn grace period on windows - by @xevrion in #10814 (b19e5)

browser:

Preserve pre-transform request defaults - by @sheremet-va in #10748 (b6060)

Fix error stacktrace location off-by-one - by @hi-ogawa, Hiroshi Ogawa and OpenCode in #10724 (62b8d)

Inlined awaited import should not trigger syntax error after transform - by @smeng9, Shaoyu Meng and Claude Opus 4.8 (1M context) in #10784 (51acd)

Mock window.print to avoid hanging - by @aaravjaichand in #7375 and #10798 (66d95)

pool:

Vm pools to respect cgroupsv2 memory limit - by @milas in #10721 (3923c)

🏎 Performance

Serve warm modules to workers in one round-trip, enable the node compile cache - by @sheremet-va in #10708 (b144a)

Make the Node compile cache opt-in, persist worker caches on teardown - by @sheremet-va in #10742 (941bc)

Reuse compiled code across vm pool contexts and prewarm the module graph - by @sheremet-va in #10744 (d8b04)

Bundle vitest's own dependencies - by @sheremet-va in #10685 (c0508)

browser:

Open browser sessions adaptively instead of maxWorkers upfront - by @sheremet-va in #10726 (6db8d)

Cut per-file round trips - by @sheremet-va in #10730 (3feef)

Stop serving framework sourcemaps in headless runs - by @sheremet-va in #10728 (6aefb)

Prewarm the browser while the Vite server starts - by @sheremet-va in #10727 (c1767)

Pre-bundle the vitest runtime in optimizeDeps - by @sheremet-va in #10713 (de631)

coverage:

Speed up v8 report generation (bounded-memory merge + precompiled globs) - by @toxik, Claude Opus 4.8 (1M context) and @AriPerkkio in #10506 (b05e5)

Reduce RPC data and unnecessary serializations - by @AriPerkkio in #10781 (7e7e3)

View changes on GitHub

Original source

🚨 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

Original source

🐞 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

Original source

🚨 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

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