🚀 Features

• experimental:
  • Tag cache directories with CACHEDIR.TAG  -  by @lifeiscontent in #11461 (a8ea3)
  • Support test.ui.theme option  -  by @sheremet-va in #11499 (1da66)
  • Highlight selector multiple matches in trace view  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11489 (5abba)
  • Print how many tests were affected and a total when running --changed  -  by @sheremet-va in #11424 (a2336)
  • Add an option to cache dependencies instead of statically parsing them  -  by @sheremet-va in #11515 (c0601)
  • Add fit and zoom controls to trace viewer  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11490 (f5dd9)

   🐞 Bug Fixes

• Fail the run on git and location filter errors  -  by @sheremet-va in #11430 (30d03)
• Enable fsModuleCache by default  -  by @sheremet-va in #11435 (ad208)
• Track project files and mocks with --changed  -  by @sheremet-va in #11432 (b0f2b)
• Refactor caching, fix : in project and change the shape of results cache  -  by @sheremet-va in #11453 (9673c)
• Keep full $ string values when taskTitleValueFormatTruncate is 0  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11485 (4f7e1)
• Resolve node builtins in client environments  -  by @sheremet-va in #11417 (56b31)
• Fix module graph builtin externals after #11421  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11491 and #11421 (008e1)
• Wrap module mocks during in-source testing  -  by @sheremet-va in #11505 (36d19)
• Handle line endings in snapshot  -  by @sheremet-va in #11522 (4c468)
• Respect root in projects  -  by @sheremet-va in #11521 (26642)
• Resolve mocks in directories with spaces  -  by @sheremet-va in #11539 (caaef)
• api:
  • Publish the api token atomically  -  by @umairnawaz333 in #11323 (6f990)
• browser:
  • Close the mock route interception race  -  by @cplieger and @sheremet-va in #8339 and #11083 (d6620)
  • Allow toHaveTextContent without arguments  -  by @nomadical in #11425 (8ebcf)
  • Apply API options without browser config  -  by @sheremet-va in #10852 (ad055)
  • Preserve undefined command arguments  -  by @sheremet-va and @AriPerkkio in #11497 (1576d)
  • Wait for setup mocks before importing a test file  -  by @kasperpeulen in #11520 (b61d1)
  • Avoid extra scroll outside the iframe  -  by @sheremet-va in #11523 (662e8)
  • Run browser instances as workers  -  by @sheremet-va in #11525 (bf04b)
    • ⚠️ This can degrade performance if you have a custom maxWorkers setting. Previously, it was applied incorrectly and could lead to Vitest using too many resources. For example, a lower number would still open too many browsers. Fixing it means Vitest opens less instances by default now.
  • Open one cdp session per tester  -  by @sheremet-va in #11542 (69e63)
  • Clean up unmocked and pending mocks  -  by @sheremet-va in #11537 (5c955)
• coverage:
  • V8 browser memory leak between test files  -  by @AriPerkkio in #11466 (2297d)
  • allowExternal fails to include uncovered files  -  by @AriPerkkio in #11513 (4ef00)
  • Filenames containing brackets incorrectly showing as uncovered  -  by @AriPerkkio in #11531 (0fa80)
  • Istanbul coverage wrong when module transform warmups  -  by @AriPerkkio in #11529 (9f61d)
• deps:
  • Update all non-major dependencies  -  by @sheremet-va in #11167 (c74e0)
• expect:
  • Fix Map and Set deep equality in some assertions  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11402 (b4e79)
  • Check value in chai-style returned  -  by @sheremet-va in #11500 (1aca0)
• mocker:
  • Fix native loader mocking edge cases  -  by @sheremet-va in #11540 (cd423)
• pretty-format:
  • Support boxed symbols  -  by @lehni in #11445 and #11446 (eba44)
• reporters:
  • Junit to strip ANSI sequences from all XML attributes  -  by @meganemura and Claude Opus 5.5 in #11407 (e1a73)
• runner:
  • Don't cache failed fixture setups  -  by @hamed-bavar in #11237 and #11238 (4ee66)
• typecheck:
  • Use typescript pool in toTestSpecification  -  by @sheremet-va in #11451 (5f273)
• ui:
  • Remove duplicate browser-open call opening two tabs  -  by @feastyr69 in #11356 and #11358 (d7e13)
  • Simplify explorer filtering + fix nested tests when search matches a suite  -  by @hi-ogawa, Hiroshi Ogawa, Codex and Claude Opus 5.5 in #11262 (a627b)
  • Store module graph once per environment  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11421 (af903)
  • Mount index.html handler on the ui base path  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11517 (1bc24)
  • Center split pane resize handle  -  by @hi-ogawa, Hiroshi Ogawa and Claude Opus 5.5 in #11506 (e658b)
• vm:
  • Bind this to module.exports  -  by @sheremet-va in #11504 (b618a)

   🏎 Performance

• Reuse fsModuleCache when filtering by source  -  by @sheremet-va in #11428 (7ebd9)
• spy: Reset only mocks that were called or reconfigured  -  by @johan-gorter and Claude Opus 5.5 in #11197 (28ef9)

    View changes on GitHub