What changed in Vitest from 4 to 5

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 https://github.com/vitest-dev/vitest/issues/9609 (3f802)
• Remove quotes from string values in test.for/each title $ variable (take 2)  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10170 (04d37)
• Default attachmentsDir from .vitest-attachements/ to .vitest/attachments/  -  by @MdSadiqMd in https://github.com/vitest-dev/vitest/issues/10186 (1ba73)
• Remove sequential test/suite options in favor of concurrent  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10198 (9229f)
• Represent locator as an object instead of a string  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10212 (80f07)
• Inline expect package  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10221 (ad162)
• Remove deprecated entry points  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10222 (994c6)
• Require Node.js 22 and Vite 6.4  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10178 (38762)
• Fail expect.poll when function didn't resolve in time  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10233 (4df04)
• Throw an error if hoistable methods are outside the top level scope  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10460 (d0b4f)
• toHaveTextContent is strict, add toMatchTextContent as alternative  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10473 (18f30)
• Don't lookup config file from ancestor directories  -  by @hi-ogawa, OpenAI Codex and Hiroshi Ogawa in https://github.com/vitest-dev/vitest/issues/10428 (945d9)
• Inline @vitest/runner package, do not publish it anymore  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10511 (6d6e4)
• Allow mutating happy-dom/jsdom window object  -  by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10373 (206e8)
• Expose concurrencyId/workerId on TestModule's diagnostics, make id 1-based  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10516 (bdd98)
• Add screenshotDirectory config to browser.expect.toMatchScreenshot  -  by @macarie in https://github.com/vitest-dev/vitest/issues/10592 (a60de)
• Update @sinonjs/fake-timers and support mocking Temporal  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10654 (f8b15)
• Remove webdriverio package  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10675 (5fed6)
• Clear mocks by default before each test  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10613 (0f646)
• Don't emit localStorage warnings on Node 26, fail gracefully when worker fails to start  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10293 (334ed)
• Separate config resolution from the server creation  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10554 (1c0ec)
• Inline projects extend the root config by default  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10750 (fec00)
• Enable mocking Temporal without fake timers  -  by @fabon-f, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10757 (ac2d4)
• Support nested projects  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10846 (ec367)
• Use > as separator in -t, calculate only once  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10686 (a0b20)
• Fail the test when an asynchronous assertion is not awaited  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10868 (86d4a)
• Share the Vite server between inline projects  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10848 (d87c9)
• Parse files statically in vitest list by default  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11088 (51e94)
• benchmark:
  • Rewrite the public API  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10113 (19f6e)
• browser:
  • Iframe scale  -  by @macarie in https://github.com/vitest-dev/vitest/issues/9745 (b6398)
  • Enable locators.exact by default  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10430 (e2032)
  • Require sessionId for orchestrator html request  -  by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10522 (79b7d)
  • Save failure screenshots in attachmentsDir  -  by @macarie in https://github.com/vitest-dev/vitest/issues/10917 (3b5bb)
• coverage:
  • include/exclude globs too eager  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/9818 (edacb)
  • Allow thresholds.perFile to accept an object  -  by @vladlenskiy and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10190 (13b78)
• expect:
  • Fix toThrow("") behavior by reverting #6710  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/9643 and https://github.com/vitest-dev/vitest/issues/6710 (6c3e4)
• mocker:
  • Deserialize automock as automock  -  by @nami8824 in https://github.com/vitest-dev/vitest/issues/10192 (2f892)
• reporters:
  • blob reporter and --merge-reports default to .vitest/blob/  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/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 https://github.com/vitest-dev/vitest/issues/10621 (58577)
• spy:
  • Preserve class mock prototype methods on instances  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10910 (6093d)
• types:
  • Add better promise support in expects and matchers  -  by @samchungy and @sheremet-va in https://github.com/vitest-dev/vitest/issues/8266 (41f55)
• ui:
  • Harden UI API access  -  by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10583 (4c26d)
  • Change html reporter default output to .vitest  -  by @hi-ogawa and Hiroshi Ogawa in https://github.com/vitest-dev/vitest/issues/10620 (29c36)

   🚀 Features

• Add createReport and .vitest report directory convention  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/9993 (72a6d)
• Expose default reporters through configDefaults.reporters  -  by @hi-ogawa and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/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 https://github.com/vitest-dev/vitest/issues/10031 (e60b2)
• Add logger.formatError  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10268 (2c5f3)
• Support typescript build mode  -  by @lishaduck in https://github.com/vitest-dev/vitest/issues/9870 (106da)
• Add toggable injectCjsGlobals option  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10709 (82671)
• Promote fsModuleCache to a top-level option  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10734 (78ed7)
• Support non-ascii characters in for/each title placeholders  -  by @k-yle in https://github.com/vitest-dev/vitest/issues/10773 (15e0a)
• Report the duration breakdown as percentages  -  by @sheremet-va and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10820 (c67d2)
• Promote parseSpecifications out of experimental  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11087 (b628c)
• Promote clearCache out of experimental  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11086 (d4fe1)
• api:
  • Expose logs recorded during the test  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10277 (cba20)
• benchmark:
  • Add pluggable benchmark provider API  -  by @GuillaumeLagrange and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10799 (86c70)
• browser:
  • Export aria tree utils  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10171 (c3423)
  • Support dom snapshot trace view  -  by @hi-ogawa, Claude Opus 5 (1M context) and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10102 (7eddd)
  • Provide project reference in ToMatchScreenshotResolvePath  -  by @macarie and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10138 (16654)
  • Show aria tree on locator element error  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10257 (04f04)
  • Support custom kind in page.mark  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10302 (053e8)
  • Live update trace view on watch UI  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10296 (78c11)
  • Add context.mark for custom command tracing  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10329 (aa514)
  • Show trace view steps in editor panel  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10404 (8c4b6)
  • Display nested mark trace in UI  -  by @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10437 (86ffc)
• cli:
  • Add --repeats CLI option  -  by @todor-a in https://github.com/vitest-dev/vitest/issues/10504 (ee48b)
  • Support -p shorthand for --project  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10826 (1addd)
• coverage:
  • V8 to track node:child_process and node:worker_threads contexts  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/9976 (9baa5)
  • thresholds.autoUpdate to receive previous threshold as argument  -  by @wouterkroes in https://github.com/vitest-dev/vitest/issues/10495 (04f81)
  • Switch to @vitest/istanbuljs packages  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11053 (5f6a5)
• junit-reporter:
  • Add jest-junit-compatible naming options  -  by @neumaennl, neumaennl, Martin Neumann and Copilot in https://github.com/vitest-dev/vitest/issues/10189 (27393)
• reporter:
  • Support html reporter single file output  -  by @hi-ogawa, OpenAI Codex and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/10235 (f757e)
  • Add custom GitHub Actions summary title  -  by @heyJonBray and @macarie in https://github.com/vitest-dev/vitest/issues/10891 (4363c)
• ui:
  • Highlight editor source locations  -  by @sheremet-va, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/11004 (bce2d)
  • Navigate trace steps with keyboard and remove indirect editor focus  -  by @sheremet-va, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/11005 (6816f)
  • Persist trace view selection in URL  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10981 (3069e)
  • Toggle trace target highlight  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/11049 (cd63e)
  • Add link to open playwright trace  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/11059 (58f02)
• vitest:
  • Create vi.when()  -  by @macarie in https://github.com/vitest-dev/vitest/issues/10174 (3900e)
• vm:
  • Support require(esm) in vm pools  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/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 https://github.com/vitest-dev/vitest/issues/10194 (9387f)
• Test tags options should overwrite inherited suite options + inherit suite options in task API  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10216 (457db)
• Udpate optimize deps config  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10223 (95dc6)
• Shell injection safety via github.ref_name in publish workflow  -  by @lloyd-c137 and lloyd-c137 in https://github.com/vitest-dev/vitest/issues/10327 (dd020)
• Make attachmentsDir root only config  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10334 (fab1b)
• Apply cjs interop for truthy __esModule  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10363 (2b135)
• Preserve vi.defineHelper callsite for async error stack  -  by @macayu17 and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10415 (ac697)
• Respect disableConsoleIntercept in browser mode  -  by @Copilot, Hiroshi Ogawa, @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10391 (66110)
• ForceRerunTriggers uses directory globs against files  -  by @Patrick-Clausen and Patrick Clausen in https://github.com/vitest-dev/vitest/issues/10421 and https://github.com/vitest-dev/vitest/issues/10420 (4fee2)
• Unify typechecking and ast collection  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10449 (af993)
• Don't print typecheck warning more than once  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10461 (15275)
• Correct collumn when parsing tests  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10467 (7c2fc)
• Fix mixed stdout/stderr log timestamps in onUserConsoleLog  -  by @Copilot, Hiroshi Ogawa, @hi-ogawa and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10308 (62756)
• Fix importOriginal with optimizer and query import  -  by @davidxharris, David Harris, @hi-ogawa, Hiroshi Ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10469 (6a3bb)
• Correct transform time calculation in merged report  -  by @potatomatoooo and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10570 and https://github.com/vitest-dev/vitest/issues/10578 (b7897)
• Fix setImmediate await in detect-async-leak  -  by @hi-ogawa and Hiroshi Ogawa in https://github.com/vitest-dev/vitest/issues/10608 (dd62b)
• Fix per-project sequence config  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10659 (40cdc)
• Add handshake timeout to iframe communication  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10656 (3545f)
• Don't print column in test names when includeTaskLocation is enabled  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10681 (bd9cc)
• Disable server HMR before plugins read it in their config hook  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10731 (e060b)
• Close the pool before the Vite servers  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10725 (96fa6)
• Remove listeners in the typecheck worker's off  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10741 (d758b)
• Keep per-file isolation in vm pools when maxWorkers is 1  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10743 (83ab9)
• Node.js 20 deprecation warning for ci.yml  -  by @hirehamir in https://github.com/vitest-dev/vitest/issues/10759 (2127f)
• Prevent node builtins double prefix  -  by @malobre in https://github.com/vitest-dev/vitest/issues/10630 and https://github.com/vitest-dev/vitest/issues/10767 (22d35)
• Set non-zero exit code when teardown throws during close  -  by @zakcutner and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10794 (22116)
• Don't race the typechecker spawn grace period on windows  -  by @xevrion in https://github.com/vitest-dev/vitest/issues/10814 (b19e5)
• Coalesce concurrent watch-mode restarts, deflake the pool stderr fixture  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10822 (a31f8)
• Prevent vitest --typecheck from reporting a false success when the tsc process crashes  -  by @hitenkalda and Hiten Kalda in https://github.com/vitest-dev/vitest/issues/10705 (a1b05)
• Collect in-source tests when the module is cached  -  by @koutaro-masaki in https://github.com/vitest-dev/vitest/issues/10577 and https://github.com/vitest-dev/vitest/issues/10589 (a7bf2)
• Swap replace() arguments so timeout error stack shows the real message  -  by @lazerg in https://github.com/vitest-dev/vitest/issues/10875 (aba0f)
• Stale mock metadata breaks automocking with isolate:false  -  by @kade-robertson in https://github.com/vitest-dev/vitest/issues/10145 and https://github.com/vitest-dev/vitest/issues/10541 (8e210)
• Don't lose worker output on teardown, deflake timing-sensitive tests  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10842 (1216b)
• Revive global concurrency limit for test lifecycle  -  by @hi-ogawa, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10928 (cf917)
• Own the post-restart rerun, keep process.exit disabled in workers  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10963 (5e69a)
• Preserve correct root during resolve config  -  by @AriPerkkio and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10909 (210ba)
• Combine multiple --project filters correctly  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10988 (66c1c)
• Fix recordArtifact location with vi.defineHelper  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/11047 (c2186)
• Invalidate resolved setup files  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11073 and https://github.com/vitest-dev/vitest/issues/11081 (488c0)
• Accept awaited value in vi.when thenResolve  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11084 (c10a1)
• Ignore computed member calls in static collection  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11085 (130f7)
• Don't duplicte oxc.target if user provides a custom array  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11095 (848d7)
• Propagate --maxWorkers to projects  -  by @Gaurav1112 in https://github.com/vitest-dev/vitest/issues/11102 (2122f)
• Apply queued mocks from doMock() in queue order  -  by @juliandescottes and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/10706 and https://github.com/vitest-dev/vitest/issues/11127 (f08ce)
• Add a warning if inline project has duplicate plugins due to unexpected extends: true  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11120 (584cf)
• Treat test.describe as a suite during static collection  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11128 (d46a7)
• browser:
  • Fix trace highlight of shadow dom on webdriverio  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10227 (b01af)
  • Simplify orchestrator otel carrier  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10283 (3514f)
  • Remove orphaned Playwright route when same module is mocked via multiple ids  -  by @Zelys-DFKH in https://github.com/vitest-dev/vitest/issues/9957 and https://github.com/vitest-dev/vitest/issues/10267 (41db6)
  • Skip wrapDynamicImport transform on ssr environment  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10355 (d3c96)
  • Fix stale source map on watch mode  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10389 (6d772)
  • Escape inline orchestrator scripts  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10412 (c22cf)
  • Disable client cdp API when allowWrite/allowExec: false  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10444 (63e3b)
  • Wait for orchestrator readiness before resolving browser sessions  -  by @soconnor-seeq in https://github.com/vitest-dev/vitest/issues/10397 (fe5ed)
  • Wait for iframe tester readiness before preparing  -  by @soconnor-seeq in https://github.com/vitest-dev/vitest/issues/10497 (f2655)
  • Encode iframeId in tester iframe URL  -  by @Pduhard, Pduhard and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/10520 and https://github.com/vitest-dev/vitest/issues/10521 (c8bf1)
  • Always derive a positive locator action timeout  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10626 (5b864)
  • Resize the browser ui only if it's not headless  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10662 (b5c61)
  • Check fs access in builtin commands  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10674 (33f96)
  • Preserve pre-transform request defaults  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10748 (b6060)
  • Fix error stacktrace location off-by-one  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10724 (62b8d)
  • Inlined awaited import should not trigger syntax error after transform  -  by @smeng9, Shaoyu Meng and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/10784 (51acd)
  • Mock window.print to avoid hanging  -  by @aaravjaichand in https://github.com/vitest-dev/vitest/issues/7375 and https://github.com/vitest-dev/vitest/issues/10798 (66d95)
  • Ignore channel events in a tester opened as a top-level window  -  by @simshanith in https://github.com/vitest-dev/vitest/issues/9379 and https://github.com/vitest-dev/vitest/issues/9381 (46a3c)
  • Resolve connectTimeout from the project config  -  by @lazerg in https://github.com/vitest-dev/vitest/issues/10879 and https://github.com/vitest-dev/vitest/issues/10880 (62c79)
  • Prebundle vite module runner with vitest  -  by @lebovvskii and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10836 and https://github.com/vitest-dev/vitest/issues/10856 (37c24)
  • Restore dependency reload warning  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10913 (90d69)
  • Configure internal optimizer dependencies  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10915 (a72f4)
  • Trigger playwright/chromium gc on lower disk availability  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10912 (032d3)
  • Disallow filter-only options in getBy* locators  -  by Arjun in https://github.com/vitest-dev/vitest/issues/10295 and https://github.com/vitest-dev/vitest/issues/10933 (9b4df)
  • Fail instead of hanging when the browser stops responding  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10956 (c496c)
  • Exit gracefully when the browser disconnects during cancellation  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10962 (67e84)
  • Don't redirect vitest in client environment  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10975 (aeb67)
  • Don't hang when ui: true in projects  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10994 (9f710)
  • Preserve trace popover state  -  by @liuluochen6-af, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10906 and https://github.com/vitest-dev/vitest/issues/11021 (1bbc2)
  • Report the action error when a task times out  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11101 (dc10f)
• cache:
  • Improve fsModuleCache resiliency during external modifications  -  by @jszumski in https://github.com/vitest-dev/vitest/issues/10869 (5eb35)
• cli:
  • Respect FORCE_COLOR over agent detection  -  by @dokson in https://github.com/vitest-dev/vitest/issues/10272 (7e66b)
  • Exit on CTRL+c even when globalSetup runs blocked code  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10863 (d568f)
• coverage:
  • exclude to not inherit negation globs from test.include  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10299 (28685)
  • Avoid matching sibling project roots  -  by @innoprej, Shin JaeHee and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10311 (e30dd)
  • Non-awaited module imports cause wrong offsets  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10643 (c4090)
  • Fail fast when coverage.reportsDirectory conflicts between concurrent runs  -  by @jgamaraalv and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10466 (833f0)
  • V8 to ignore Vite SSR's generated import bindings  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11023 (c6174)
  • Prevent crash on /@fs/ prepended virtual files  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11119 (c4473)
• deps:
  • Update ivya to fix empty aria tree snapshot  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10218 (f7822)
  • Update fake-timers to 15.3.2. support toNotFake  -  by @BPScott, @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10043 (bbf2f)
  • Update all non-major dependencies  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/9958 (7faa7)
  • Update all non-major dependencies  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10861 (0188c)
  • Update all non-major dependencies  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10898 (61c4b)
  • Update all non-major dependencies  -  in https://github.com/vitest-dev/vitest/issues/10966 (65263)
  • Update all non-major dependencies  -  in https://github.com/vitest-dev/vitest/issues/11043 (732df)
• expect:
  • Allow readonly arrays and sets in toBeOneOf  -  by @YBJ0000 in https://github.com/vitest-dev/vitest/issues/10264 and https://github.com/vitest-dev/vitest/issues/10374 (fed11)
  • Handle nullish toHaveProperty values  -  by @liyimil in https://github.com/vitest-dev/vitest/issues/10735 and https://github.com/vitest-dev/vitest/issues/10811 (99e59)
• junit:
  • Include unhandled errors in JUnit XML report  -  by @gbleu and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/10244 (6f74e)
• mocker:
  • Skip hoist transform without ast mock calls  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10410 (0468e)
  • Hoist vi.mock() for vite-plus/test imports  -  by @Brooooooklyn and Claude Opus 5 (1M context) in https://github.com/vitest-dev/vitest/issues/10489 (88376)
  • Restrict redirect mocks to the fs allowlist  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10972 (8ff9b)
• pool:
  • Prevent test run hang on worker crash  -  by @jaxalo and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10543 (40878)
  • Improve error message when worker exits unexpectedly  -  by @filmaj and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10587 (76139)
  • Vm pools to respect cgroupsv2 memory limit  -  by @milas in https://github.com/vitest-dev/vitest/issues/10721 (3923c)
  • Worker init to handle queued synchronous messages  -  by @lazerg and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10932 (76096)
  • Report the worker exit instead of a pipe error that raced it  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10964 (59a03)
• reporter:
  • Guard against non-finite slowTestThreshold in summary reporter  -  by @OfekDanny, Ofek Danny, Claude Opus 5 (1M context) and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10202 (f362f)
  • Fix non-existing import subpath module blob serialization  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10318 (29cb0)
• reporters:
  • Fix blob file name with label  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10346 (c5e2e)
  • summary to intercept logger's streams even when they are not process.std* streams  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10340 (f79e7)
  • Fix missing testModules in onTestRunEnd when merging blobs from different root directory test runs  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/10348 (745b3)
  • Print parent describe suites when the passed-test list is hidden  -  by @ChihebBENCHEIKH1, Chiheb Bencheikh and @sheremet-va in https://github.com/vitest-dev/vitest/issues/10606 and https://github.com/vitest-dev/vitest/issues/10768 (658af)
  • Display test.name in GitHub Actions reporter summary header  -  by @macarie in https://github.com/vitest-dev/vitest/issues/10887 (49e24)
• runner:
  • Propagate chainable flags in describe.for  -  by @DoriAlagem, Dor Alagem and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10187 (db678)
  • Limit concurrency per task branch in addition to per leaf callbacks  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10179 (3112a)
  • Remove AbortSignal listener leak in withCancel  -  by @tomohiro86 and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10265 (ab098)
  • Don't fail collection when accessing error.stack throws  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10839 (202e2)
• snapshot:
  • Fail test when snapshot assertion is used with test.fails  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10090 (e1aa7)
  • Treat empty string as valid snapshot  -  by @mayrang and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10188 (e145d)
  • Support no-unsafe-eval CSP by evaluating snapshot files on server  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/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 https://github.com/vitest-dev/vitest/issues/10978 (17646)
• spy:
  • Support private method spy types  -  by @cyphercodes in https://github.com/vitest-dev/vitest/issues/10172 and https://github.com/vitest-dev/vitest/issues/10213 (628ab)
  • Point ESM namespace spy error to module mocking docs  -  by @ryandiginomad and Ryan Tang in https://github.com/vitest-dev/vitest/issues/10707 (d6cec)
• typecheck:
  • Report a checker crash on Windows instead of a spawn failure  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10907 (77aac)
• types:
  • Allow changed in configuration options  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10651 (0da12)
• ui:
  • Fix duplicate colored error message  -  by @hi-ogawa and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/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 https://github.com/vitest-dev/vitest/issues/10338 (4f7c2)
  • Fix module graph in browser mode with --ui  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10386 (3003c)
  • Render ANSI color codes in editor panel inline error widget  -  by @Copilot, Hiroshi Ogawa and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10418 (766b8)
  • Fix code editor error and annotations gadgets layout shifts  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10969 (438ed)
  • Synchronize watch-run UI state on file removal  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10941 (30c21)
  • Require auth for coverage report and all UI subtree requests  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10971 (5622f)
  • Improve suite interaction and layout in explorer tree  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10970 (91231)
  • Reveal explorer virtual scroller on resize  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/10998 (1f4fc)
  • Persist trace step-iframe split pane sizes  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/11027 (3cd01)
  • Add suite level report view  -  by @dvmhmdsd, Hiroshi Ogawa, OpenCode (gpt-5.6-sol) and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/11038 (602d2)
  • Hide running count in static reports  -  by @hi-ogawa, Hiroshi Ogawa and OpenCode (gpt-5.6-sol) in https://github.com/vitest-dev/vitest/issues/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 https://github.com/vitest-dev/vitest/issues/10892 and https://github.com/vitest-dev/vitest/issues/10893 (fe790)
• vitest:
  • Strip non-serializable functions from inline diff config  -  by @DucMinhNe in https://github.com/vitest-dev/vitest/issues/10573 (5b81a)
  • Remove broken "./src/*" export from package.json  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10918 (2e5df)
  • Render non-Error causes from env setup so the actual diagnostic is not dropped  -  by @spokodev in https://github.com/vitest-dev/vitest/issues/10567 (b298d)
• vm:
  • Fix external module resolve error with deps optimizer query for encoded URI  -  by @SveLil in https://github.com/vitest-dev/vitest/issues/10658 (90c4e)
  • Stop retaining every finished test file in vm pool workers  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10854 (38503)
  • Fall back to compiling from source when a module's code cache is rejected  -  by @MarshallOfSound in https://github.com/vitest-dev/vitest/issues/11031 (c3ba1)
  • Link module graphs one at a time  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11096 (3f2dd)
• webdriverio:
  • Allow gpu in headless chrome  -  by @rotempasharel1 in https://github.com/vitest-dev/vitest/issues/10376 (f310a)
• worker:
  • Bind stdio's early in case overriden  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11020 (67ef7)

   🏎 Performance

• Stringify diff objects only once  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10276 (d006a)
• Improve performance in hot paths  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10446 (03faf)
• Serve warm modules to workers in one round-trip, enable the node compile cache  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10708 (b144a)
• Make the Node compile cache opt-in, persist worker caches on teardown  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10742 (941bc)
• Reuse compiled code across vm pool contexts and prewarm the module graph  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10744 (d8b04)
• Bundle vitest's own dependencies  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10685 (c0508)
• Lowers peak memory usage when using --changed on a large graph  -  by @jszumski in https://github.com/vitest-dev/vitest/issues/10866 (9f23f)
• Initialize trace view in the orchestrator once per worker  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10984 (fad26)
• browser:
  • Reduce matching screenshot overhead  -  by @kasperpeulen in https://github.com/vitest-dev/vitest/issues/10278 (511c0)
  • Open browser sessions adaptively instead of maxWorkers upfront  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10726 (6db8d)
  • Cut per-file round trips  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10730 (3feef)
  • Stop serving framework sourcemaps in headless runs  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10728 (6aefb)
  • Prewarm the browser while the Vite server starts  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10727 (c1767)
  • Pre-bundle the vitest runtime in optimizeDeps  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10713 (de631)
  • Serve framework assets as immutable  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10729 (7af87)
• cache:
  • Hash the environment-invariant part of the fs module cache key once  -  by @MarshallOfSound in https://github.com/vitest-dev/vitest/issues/11029 (1d365)
• coverage:
  • Speed up v8 report generation (bounded-memory merge + precompiled globs)  -  by @toxik, Claude Opus 5 (1M context) and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10506 (b05e5)
  • Reduce RPC data and unnecessary serializations  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/10781 (7e7e3)
• expect:
  • Avoid redefining matcher state  -  by @scttcper and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/11048 (58e71)
  • Lazily format spy matcher failures  -  by @scttcper and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/11090 (e08c4)
• spy:
  • Avoid scanning cleared mocks  -  by @scttcper and OpenAI Codex in https://github.com/vitest-dev/vitest/issues/11092 (2451e)
• vm:
  • Don't prewarm modules the worker never requests  -  by @MarshallOfSound and @sheremet-va in https://github.com/vitest-dev/vitest/issues/11033 (1e9f8)
  • Let environments opt out of the module graph prewarm  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11078 (a6d5e)

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