v5.1.0

   🚀 Features

• Add --last-failed to run only failed tests  -  by @sheremet-va in #11558 (82f63)
• Support Temporal.Instant and Temporal.ZonedDateTime in vi.setSystemTime()  -  by @Prajwal2246, Prajwal2246, Claude Opus 5.5 (1M context), @hi-ogawa and Codex (GPT-6) in #11321 (f150f)
• Introduce --since-last-run flag  -  by @sheremet-va in #11516 (08bd9)
• Expose per-retry/repeat attempt result  -  by @hi-ogawa, Codex (GPT-6) and Claude Opus 5.5 (1M context) in #11232 (21be4)
• Support fake timers for node:timers and node:timers/promise  -  by @hi-ogawa, OpenCode and Codex (GPT-6) in #10899 (fbe97)
• Allow coverage providers to store data in fs module cache  -  by @AriPerkkio in #11747 (54a2b)
• Interactively review failed snapshots  -  by @macarie and @hi-ogawa in #11325 (54e5b)
• browser:
  • Mock modules through an import map  -  by @sheremet-va in #11534 (707f8)
  • Drop experimental label from trace view  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11518 (44c3c)
  • Introduce experimental pointer API  -  by @macarie in #10780 (5dc09)
  • Capture aria snapshot in trace view  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11492 (0cc39)
  • Show trace steps timeline on terminal on test failure  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11594 (973dc)
  • Add failure-only trace view mode  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11612 (d5d7d)
  • Enable failure-only trace view by default  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11766 (f37b6)
• coverage:
  • V8 to support ignoreNode option  -  by @erickserra and @AriPerkkio in #11688 (e02db)
• experimental:
  • Add trace timeline for node  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11753 (4e985)
  • Add message option to vi.waitFor and vi.waitUntil  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11754 (fd145)

   🐞 Bug Fixes

• Rerun setup files after --changed filtering  -  by @sheremet-va in #11621 (3a39c)
• Return the mock to concurrent imports  -  by @sheremet-va in #11623 (1453b)
• Don't fail on console log pending at teardown  -  by @sheremet-va in #11619 (a60b8)
• Reference chai types in every d.ts chunk  -  by @sheremet-va in #11618 (fb150)
• Detect mock factory cycles that form later  -  by @sheremet-va in #11642 (e9554)
• Skip fs module cache for typed import.meta.glob  -  by @sheremet-va in #11666 (79501)
• Run tests that import a deleted file  -  by @sheremet-va in #11669 (80aa1)
• Keep syntax highlighting in code frames  -  by @sheremet-va in #11705 (d39f5)
• Respect CLI filters when prewarming browsers  -  by @sheremet-va and Benjamin Tang in #11706 (10947)
• Read cached source as utf-8  -  by @juan-fernandez in #11682 and #11709 (867a5)
• Inherit watch from the root config in projects  -  by @nstepien and Claude Opus 5.5 (1M context) in #11724 (77c12)
• Prefix expect.poll message to all errors  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11756 (cab58)
• Support api.port 0  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11641 (3667c)
• Show attempts in test error logs of retried tests  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11696 (77a94)
• Preserve rootDir in project paths  -  by @btea in #11816 (bf96d)
• browser:
  • Change default port to 23315  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11640 (a2ec4)
  • Advance fake timers in actions and expect.element  -  by @julienw, @hi-ogawa and Claude Opus 5.5 (1M context) in #11242 (68190)
  • Drop trace view warning without html reporter  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11665 (e6407)
  • Detect shared chunks via the optimizer  -  by @sheremet-va in #11661 (e2e9c)
  • Clear screenshot stability timeout  -  by @sheremet-va in #11659 (fbe37)
  • Measure prepare duration with one clock  -  by @sheremet-va in #11667 (a3ed4)
  • Keep failure screenshot per attempt  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11694 (a5022)
  • Print trace timeline of each attempt  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11695 (27229)
  • Don't hang in page.viewport()  -  by @sheremet-va in #11738 (49ff4)
  • Skip trace entries after their attempt ended  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11771 (7a56f)
  • Focus the iframe before clicking in playwright  -  by @sheremet-va in #11798 (eb20a)
  • Fail the run when a tester cannot connect  -  by @sheremet-va in #11802 (605bf)
  • Treat edge as chromium in toHaveStyle  -  by @aliamanatali in #11813 (f4dd9)
• cache:
  • Handle concurrent cache clearing  -  by @7rulnik in #11697 (09076)
  • Key module cache on the deps optimizer  -  by @MO2k4 and Martin Oehlert in #11775 (52485)
  • Do not fail when the cache dir is unwritable  -  by @ezefernandezyf in #11781 (274ab)
• cli:
  • Use camelCase for sinceLastRun help  -  by @fengmk2 in #11707 (5c674)
• coverage:
  • V8 autoAttachSubprocess to use .tmp directory  -  by @AriPerkkio in #11632 (de5af)
  • V8 to ignore Vite's generated CJS namespace import helper  -  by @AriPerkkio in #11676 (5901f)
• deps:
  • Update all non-major dependencies  -  by @sheremet-va in #11637 (2b18e)
• expect:
  • Keep soft .resolves/.rejects error location  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11792 (42770)
• mocker:
  • Don't change the original prototype chain  -  by @sheremet-va and Max Schwenk in #11737 (cca42)
  • Use root mocks for linked packages  -  by @sheremet-va in #7708 and #11739 (810ec)
• runner:
  • Don't drop throttled task updates  -  by @sheremet-va in #11795 (8e837)
• ui:
  • Escape search text in explorer highlight  -  by @sheremet-va in #11672 (3c6d6)
  • Fix html reporter crash when --bail cancels files  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11693 (36a5f)
  • Fix quirks mode in trace view replay  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11744 (b9b73)
  • Let coverage report follow UI color scheme  -  by @AriPerkkio in #11765 (59c2d)
  • Open trace view only for tests with a trace  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11770 (c022d)
• vm:
  • Strip hashbang before compiling CommonJS dependencies  -  by @cwoebker in #11731 (1a77c)
  • Keep node globals after teardown  -  by @francesco-agnoletto in #11380 and #11681 (a57b4)
  • Reset fake timers after each test file  -  by @francesco-agnoletto in #11679 and #11779 (78c46)
  • Keep assignable accessor globals writable in node environment  -  by @MO2k4 and Martin Oehlert in #11834 (a5ec3)

   🏎 Performance

• Reuse fsModuleCache in static collection  -  by @sheremet-va in #11622 (1766c)
• Cache setup/mock resolves in reused workers  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11760 (5de10)
• Don't refetch warm modules in reused runners  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11761 (4f135)
• browser:
  • Map only first frame for trace locations  -  by @hi-ogawa and Claude Opus 5.5 (1M context) in #11613 (a967d)
  • Disable WebSocketServer's allowSynchronousEvents  -  by @nstepien in #11794 (d4572)
• coverage:
  • Istanbul to use magic-string+rolldown for instrumentation  -  by @AriPerkkio in #11648 (2470b)
  • Istanbul to collect uncovered files in Promise.all  -  by @AriPerkkio in #11713 (f1092)
  • Istanbul to not store input source maps in coverage data  -  by @AriPerkkio in #11686 (2debb)
• expect:
  • Compare typed arrays in one loop  -  by @sheremet-va in #11658 (908eb)

    View changes on GitHub