Vitest v5.1.0 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: vitest · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-02.

Compatibility not verified — check source notes

📄 .MD

✨ Features 6 ⚡ Improvements 6 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Vitest v5.1.0. Source highlight:    🚀 Features

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

✨ New Features & Capabilities (6)

Add `--last-failed` to run only failed tests  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11558 <samp>(82f63)</samp>
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 https://github.com/vitest-dev/vitest/issues/11321 <samp>(f150f)</samp>
Introduce `--since-last-run` flag  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11516 <samp>(08bd9)</samp>
Expose per-retry/repeat attempt result  -  by @hi-ogawa, **Codex (GPT-6)** and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11232 <samp>(21be4)</samp>
Support fake timers for `node:timers` and `node:timers/promise`  -  by @hi-ogawa, **OpenCode** and **Codex (GPT-6)** in https://github.com/vitest-dev/vitest/issues/10899 <samp>(fbe97)</samp>
Allow coverage providers to store data in fs module cache  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11747 <samp>(54a2b)</samp>

⚡ Performance & Enhancements (6)

Reuse fsModuleCache in static collection  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11622 <samp>(1766c)</samp>
Cache setup/mock resolves in reused workers  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11760 <samp>(5de10)</samp>
Don't refetch warm modules in reused runners  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11761 <samp>(4f135)</samp>
Map only first frame for trace locations  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11613 <samp>(a967d)</samp>
Disable WebSocketServer's allowSynchronousEvents  -  by @nstepien in https://github.com/vitest-dev/vitest/issues/11794 <samp>(d4572)</samp>
Istanbul to use `magic-string`+`rolldown` for instrumentation  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11648 <samp>(2470b)</samp>

🔧 Bug Fixes & Patches (6)

Rerun setup files after `--changed` filtering  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11621 <samp>(3a39c)</samp>
Return the mock to concurrent imports  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11623 <samp>(1453b)</samp>
Don't fail on console log pending at teardown  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11619 <samp>(a60b8)</samp>
Reference chai types in every d.ts chunk  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11618 <samp>(fb150)</samp>
Detect mock factory cycles that form later  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11642 <samp>(e9554)</samp>
Skip fs module cache for typed import.meta.glob  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11666 <samp>(79501)</samp>

📄 View Raw Release Notes (Original Developer Log)

###    🚀 Features - Add `--last-failed` to run only failed tests  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11558 [<samp>(82f63)</samp>](https://github.com/vitest-dev/vitest/commit/82f634220) - 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 https://github.com/vitest-dev/vitest/issues/11321 [<samp>(f150f)</samp>](https://github.com/vitest-dev/vitest/commit/f150f5108) - Introduce `--since-last-run` flag  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11516 [<samp>(08bd9)</samp>](https://github.com/vitest-dev/vitest/commit/08bd93b7e) - Expose per-retry/repeat attempt result  -  by @hi-ogawa, **Codex (GPT-6)** and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11232 [<samp>(21be4)</samp>](https://github.com/vitest-dev/vitest/commit/21be412ed) - Support fake timers for `node:timers` and `node:timers/promise`  -  by @hi-ogawa, **OpenCode** and **Codex (GPT-6)** in https://github.com/vitest-dev/vitest/issues/10899 [<samp>(fbe97)</samp>](https://github.com/vitest-dev/vitest/commit/fbe973cae) - Allow coverage providers to store data in fs module cache  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11747 [<samp>(54a2b)</samp>](https://github.com/vitest-dev/vitest/commit/54a2bdb81) - Interactively review failed snapshots  -  by @macarie and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/11325 [<samp>(54e5b)</samp>](https://github.com/vitest-dev/vitest/commit/54e5b8a8a) - **browser**: - Mock modules through an import map  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11534 [<samp>(707f8)</samp>](https://github.com/vitest-dev/vitest/commit/707f8adf4) - Drop experimental label from trace view  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11518 [<samp>(44c3c)</samp>](https://github.com/vitest-dev/vitest/commit/44c3c2fcf) - Introduce experimental `pointer` API  -  by @macarie in https://github.com/vitest-dev/vitest/issues/10780 [<samp>(5dc09)</samp>](https://github.com/vitest-dev/vitest/commit/5dc09f0ea) - Capture aria snapshot in trace view  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11492 [<samp>(0cc39)</samp>](https://github.com/vitest-dev/vitest/commit/0cc39fb90) - Show trace steps timeline on terminal on test failure  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11594 [<samp>(973dc)</samp>](https://github.com/vitest-dev/vitest/commit/973dc84be) - Add failure-only trace view mode  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11612 [<samp>(d5d7d)</samp>](https://github.com/vitest-dev/vitest/commit/d5d7d2f06) - Enable failure-only trace view by default  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11766 [<samp>(f37b6)</samp>](https://github.com/vitest-dev/vitest/commit/f37b6b707) - **coverage**: - V8 to support `ignoreNode` option  -  by @erickserra and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11688 [<samp>(e02db)</samp>](https://github.com/vitest-dev/vitest/commit/e02db0869) - **experimental**: - Add trace timeline for node  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11753 [<samp>(4e985)</samp>](https://github.com/vitest-dev/vitest/commit/4e9855151) - Add message option to vi.waitFor and vi.waitUntil  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11754 [<samp>(fd145)</samp>](https://github.com/vitest-dev/vitest/commit/fd145d8d6) ###    🐞 Bug Fixes - Rerun setup files after `--changed` filtering  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11621 [<samp>(3a39c)</samp>](https://github.com/vitest-dev/vitest/commit/3a39cfc54) - Return the mock to concurrent imports  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11623 [<samp>(1453b)</samp>](https://github.com/vitest-dev/vitest/commit/1453ba690) - Don't fail on console log pending at teardown  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11619 [<samp>(a60b8)</samp>](https://github.com/vitest-dev/vitest/commit/a60b8e132) - Reference chai types in every d.ts chunk  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11618 [<samp>(fb150)</samp>](https://github.com/vitest-dev/vitest/commit/fb150158b) - Detect mock factory cycles that form later  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11642 [<samp>(e9554)</samp>](https://github.com/vitest-dev/vitest/commit/e95541584) - Skip fs module cache for typed import.meta.glob  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11666 [<samp>(79501)</samp>](https://github.com/vitest-dev/vitest/commit/79501f3a1) - Run tests that import a deleted file  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11669 [<samp>(80aa1)</samp>](https://github.com/vitest-dev/vitest/commit/80aa13dd6) - Keep syntax highlighting in code frames  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11705 [<samp>(d39f5)</samp>](https://github.com/vitest-dev/vitest/commit/d39f51548) - Respect CLI filters when prewarming browsers  -  by @sheremet-va and **Benjamin Tang** in https://github.com/vitest-dev/vitest/issues/11706 [<samp>(10947)</samp>](https://github.com/vitest-dev/vitest/commit/109474892) - Read cached source as utf-8  -  by @juan-fernandez in https://github.com/vitest-dev/vitest/issues/11682 and https://github.com/vitest-dev/vitest/issues/11709 [<samp>(867a5)</samp>](https://github.com/vitest-dev/vitest/commit/867a5e41c) - Inherit `watch` from the root config in projects  -  by @nstepien and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11724 [<samp>(77c12)</samp>](https://github.com/vitest-dev/vitest/commit/77c122c6b) - Prefix expect.poll message to all errors  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11756 [<samp>(cab58)</samp>](https://github.com/vitest-dev/vitest/commit/cab5877db) - Support api.port 0  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11641 [<samp>(3667c)</samp>](https://github.com/vitest-dev/vitest/commit/3667cf8a3) - Show attempts in test error logs of retried tests  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11696 [<samp>(77a94)</samp>](https://github.com/vitest-dev/vitest/commit/77a94328a) - Preserve rootDir in project paths  -  by @btea in https://github.com/vitest-dev/vitest/issues/11816 [<samp>(bf96d)</samp>](https://github.com/vitest-dev/vitest/commit/bf96dad6a) - **browser**: - Change default port to 23315  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11640 [<samp>(a2ec4)</samp>](https://github.com/vitest-dev/vitest/commit/a2ec4166d) - Advance fake timers in actions and expect.element  -  by @julienw, @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11242 [<samp>(68190)</samp>](https://github.com/vitest-dev/vitest/commit/6819008ce) - Drop trace view warning without html reporter  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11665 [<samp>(e6407)</samp>](https://github.com/vitest-dev/vitest/commit/e64075ef5) - Detect shared chunks via the optimizer  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11661 [<samp>(e2e9c)</samp>](https://github.com/vitest-dev/vitest/commit/e2e9c64b0) - Clear screenshot stability timeout  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11659 [<samp>(fbe37)</samp>](https://github.com/vitest-dev/vitest/commit/fbe37c083) - Measure prepare duration with one clock  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11667 [<samp>(a3ed4)</samp>](https://github.com/vitest-dev/vitest/commit/a3ed42a14) - Keep failure screenshot per attempt  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11694 [<samp>(a5022)</samp>](https://github.com/vitest-dev/vitest/commit/a5022655d) - Print trace timeline of each attempt  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11695 [<samp>(27229)</samp>](https://github.com/vitest-dev/vitest/commit/272296e5d) - Don't hang in `page.viewport()`  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11738 [<samp>(49ff4)</samp>](https://github.com/vitest-dev/vitest/commit/49ff4420c) - Skip trace entries after their attempt ended  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11771 [<samp>(7a56f)</samp>](https://github.com/vitest-dev/vitest/commit/7a56fea53) - Focus the iframe before clicking in playwright  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11798 [<samp>(eb20a)</samp>](https://github.com/vitest-dev/vitest/commit/eb20a3af1) - Fail the run when a tester cannot connect  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11802 [<samp>(605bf)</samp>](https://github.com/vitest-dev/vitest/commit/605bf22b7) - Treat edge as chromium in toHaveStyle  -  by @aliamanatali in https://github.com/vitest-dev/vitest/issues/11813 [<samp>(f4dd9)</samp>](https://github.com/vitest-dev/vitest/commit/f4dd97652) - **cache**: - Handle concurrent cache clearing  -  by @7rulnik in https://github.com/vitest-dev/vitest/issues/11697 [<samp>(09076)</samp>](https://github.com/vitest-dev/vitest/commit/090766a42) - Key module cache on the deps optimizer  -  by @MO2k4 and **Martin Oehlert** in https://github.com/vitest-dev/vitest/issues/11775 [<samp>(52485)</samp>](https://github.com/vitest-dev/vitest/commit/524856ed0) - Do not fail when the cache dir is unwritable  -  by @ezefernandezyf in https://github.com/vitest-dev/vitest/issues/11781 [<samp>(274ab)</samp>](https://github.com/vitest-dev/vitest/commit/274ab70c4) - **cli**: - Use camelCase for sinceLastRun help  -  by @fengmk2 in https://github.com/vitest-dev/vitest/issues/11707 [<samp>(5c674)</samp>](https://github.com/vitest-dev/vitest/commit/5c674859b) - **coverage**: - V8 `autoAttachSubprocess` to use `.tmp` directory  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11632 [<samp>(de5af)</samp>](https://github.com/vitest-dev/vitest/commit/de5af2939) - V8 to ignore Vite's generated CJS namespace import helper  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11676 [<samp>(5901f)</samp>](https://github.com/vitest-dev/vitest/commit/5901fb458) - **deps**: - Update all non-major dependencies  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11637 [<samp>(2b18e)</samp>](https://github.com/vitest-dev/vitest/commit/2b18e3724) - **expect**: - Keep soft .resolves/.rejects error location  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11792 [<samp>(42770)</samp>](https://github.com/vitest-dev/vitest/commit/42770759f) - **mocker**: - Don't change the original prototype chain  -  by @sheremet-va and **Max Schwenk** in https://github.com/vitest-dev/vitest/issues/11737 [<samp>(cca42)</samp>](https://github.com/vitest-dev/vitest/commit/cca423de9) - Use root __mocks__ for linked packages  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/7708 and https://github.com/vitest-dev/vitest/issues/11739 [<samp>(810ec)</samp>](https://github.com/vitest-dev/vitest/commit/810ec66e1) - **runner**: - Don't drop throttled task updates  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11795 [<samp>(8e837)</samp>](https://github.com/vitest-dev/vitest/commit/8e837b87a) - **ui**: - Escape search text in explorer highlight  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11672 [<samp>(3c6d6)</samp>](https://github.com/vitest-dev/vitest/commit/3c6d6dd24) - Fix html reporter crash when --bail cancels files  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11693 [<samp>(36a5f)</samp>](https://github.com/vitest-dev/vitest/commit/36a5fa132) - Fix quirks mode in trace view replay  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11744 [<samp>(b9b73)</samp>](https://github.com/vitest-dev/vitest/commit/b9b73596c) - Let coverage report follow UI color scheme  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11765 [<samp>(59c2d)</samp>](https://github.com/vitest-dev/vitest/commit/59c2dd3a7) - Open trace view only for tests with a trace  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11770 [<samp>(c022d)</samp>](https://github.com/vitest-dev/vitest/commit/c022d630f) - **vm**: - Strip hashbang before compiling CommonJS dependencies  -  by @cwoebker in https://github.com/vitest-dev/vitest/issues/11731 [<samp>(1a77c)</samp>](https://github.com/vitest-dev/vitest/commit/1a77c6cbc) - Keep node globals after teardown  -  by @francesco-agnoletto in https://github.com/vitest-dev/vitest/issues/11380 and https://github.com/vitest-dev/vitest/issues/11681 [<samp>(a57b4)</samp>](https://github.com/vitest-dev/vitest/commit/a57b4d8a3) - Reset fake timers after each test file  -  by @francesco-agnoletto in https://github.com/vitest-dev/vitest/issues/11679 and https://github.com/vitest-dev/vitest/issues/11779 [<samp>(78c46)</samp>](https://github.com/vitest-dev/vitest/commit/78c46acdf) - Keep assignable accessor globals writable in node environment  -  by @MO2k4 and **Martin Oehlert** in https://github.com/vitest-dev/vitest/issues/11834 [<samp>(a5ec3)</samp>](https://github.com/vitest-dev/vitest/commit/a5ec316f8) ###    🏎 Performance - Reuse fsModuleCache in static collection  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11622 [<samp>(1766c)</samp>](https://github.com/vitest-dev/vitest/commit/1766c257d) - Cache setup/mock resolves in reused workers  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11760 [<samp>(5de10)</samp>](https://github.com/vitest-dev/vitest/commit/5de103a9c) - Don't refetch warm modules in reused runners  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11761 [<samp>(4f135)</samp>](https://github.com/vitest-dev/vitest/commit/4f135cc1d) - **browser**: - Map only first frame for trace locations  -  by @hi-ogawa and **Claude Opus 5.5 (1M context)** in https://github.com/vitest-dev/vitest/issues/11613 [<samp>(a967d)</samp>](https://github.com/vitest-dev/vitest/commit/a967d8f39) - Disable WebSocketServer's allowSynchronousEvents  -  by @nstepien in https://github.com/vitest-dev/vitest/issues/11794 [<samp>(d4572)</samp>](https://github.com/vitest-dev/vitest/commit/d4572032f) - **coverage**: - Istanbul to use `magic-string`+`rolldown` for instrumentation  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11648 [<samp>(2470b)</samp>](https://github.com/vitest-dev/vitest/commit/2470befec) - Istanbul to collect uncovered files in `Promise.all`  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11713 [<samp>(f1092)</samp>](https://github.com/vitest-dev/vitest/commit/f1092b34b) - Istanbul to not store input source maps in coverage data  -  by @AriPerkkio in https://github.com/vitest-dev/vitest/issues/11686 [<samp>(2debb)</samp>](https://github.com/vitest-dev/vitest/commit/2debb4e51) - **expect**: - Compare typed arrays in one loop  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11658 [<samp>(908eb)</samp>](https://github.com/vitest-dev/vitest/commit/908eb573f) #####     [View changes on GitHub](https://github.com/vitest-dev/vitest/compare/v5.0.5...v5.1.0)

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