Vitest v5.1.0-beta.1 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

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

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes

📄 .MD

✨ Features 6 ⚡ Improvements 2 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Vitest v5.1.0-beta.1. Source highlight:    🚀 Features

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

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📊 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**, **Hiroshi 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, **Hiroshi Ogawa**, **Codex (GPT-6)** and **Claude Opus 5.5** 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, **Hiroshi Ogawa**, **OpenCode** and **Codex (GPT-6)** in https://github.com/vitest-dev/vitest/issues/10899 <samp>(fbe97)</samp>
Mock modules through an import map  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11534 <samp>(707f8)</samp>

⚡ Performance & Enhancements (2)

Reuse fsModuleCache in static collection  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/11622 <samp>(1766c)</samp>
**browser**: Map only first frame for trace locations  -  by @hi-ogawa, **Hiroshi Ogawa** and **Claude Opus 5.5** in https://github.com/vitest-dev/vitest/issues/11613 <samp>(a967d)</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>
Change default port to 23315  -  by @hi-ogawa, **Hiroshi Ogawa** and **Claude Opus 5.5** in https://github.com/vitest-dev/vitest/issues/11640 <samp>(a2ec4)</samp>
Advance fake timers in actions and expect.element  -  by @julienw, **Hiroshi Ogawa** and **Claude Opus 5.5** in https://github.com/vitest-dev/vitest/issues/11242 <samp>(68190)</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**, **Hiroshi 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, **Hiroshi Ogawa**, **Codex (GPT-6)** and **Claude Opus 5.5** 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, **Hiroshi 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) - **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, **Hiroshi Ogawa** and **Claude Opus 5.5** 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, **Hiroshi Ogawa** and **Claude Opus 5.5** in https://github.com/vitest-dev/vitest/issues/11492 [<samp>(0cc39)</samp>](https://github.com/vitest-dev/vitest/commit/0cc39fb90) ###    🐞 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) - **browser**: - Change default port to 23315  -  by @hi-ogawa, **Hiroshi Ogawa** and **Claude Opus 5.5** 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, **Hiroshi Ogawa** and **Claude Opus 5.5** in https://github.com/vitest-dev/vitest/issues/11242 [<samp>(68190)</samp>](https://github.com/vitest-dev/vitest/commit/6819008ce) - **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) - **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) ###    🏎 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) - **browser**: Map only first frame for trace locations  -  by @hi-ogawa, **Hiroshi Ogawa** and **Claude Opus 5.5** in https://github.com/vitest-dev/vitest/issues/11613 [<samp>(a967d)</samp>](https://github.com/vitest-dev/vitest/commit/a967d8f39) #####     [View changes on GitHub](https://github.com/vitest-dev/vitest/compare/v5.0.5...v5.1.0-beta.1)

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