Vitest v4.1.2 — 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: 2026-11-01.

Compatibility not verified — check source notes

📄 .MD

🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Vitest v4.1.2. Source highlight: This release bumps Vitest's `flatted` version and removes version pinning to resolve `flatted`'s CVE related issues (https://github.com/vitest-dev/vitest/issues/9975).

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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.

🔧 Bug Fixes & Patches (6)

Don't resolve `setupFiles` from parent directory  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/9960 <samp>(7aa93)</samp>
Ensure sequential mock/unmock resolution  -  by @hi-ogawa and **Claude Opus 4.6** in https://github.com/vitest-dev/vitest/issues/9830 <samp>(7c065)</samp>
**browser**: Take failure screenshot if `toMatchScreenshot` can't capture a stable screenshot  -  by @macarie in https://github.com/vitest-dev/vitest/issues/9847 <samp>(faace)</samp>
**coverage**: Correct `coverageConfigDefaults` values and types  -  by @Arthie in https://github.com/vitest-dev/vitest/issues/9940 <samp>(b3c99)</samp>
**pretty-format**: Fix output limit over counting  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/9965 <samp>(d3b7a)</samp>
Disable colors if agent is detected  -  by @sheremet-va and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/9851 <samp>(6f97b)</samp>

📄 View Raw Release Notes (Original Developer Log)

This release bumps Vitest's `flatted` version and removes version pinning to resolve `flatted`'s CVE related issues (https://github.com/vitest-dev/vitest/issues/9975). ###    🐞 Bug Fixes - Don't resolve `setupFiles` from parent directory  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/9960 [<samp>(7aa93)</samp>](https://github.com/vitest-dev/vitest/commit/7aa937776) - Ensure sequential mock/unmock resolution  -  by @hi-ogawa and **Claude Opus 4.6** in https://github.com/vitest-dev/vitest/issues/9830 [<samp>(7c065)</samp>](https://github.com/vitest-dev/vitest/commit/7c06598db) - **browser**: Take failure screenshot if `toMatchScreenshot` can't capture a stable screenshot  -  by @macarie in https://github.com/vitest-dev/vitest/issues/9847 [<samp>(faace)</samp>](https://github.com/vitest-dev/vitest/commit/faace1fbe) - **coverage**: Correct `coverageConfigDefaults` values and types  -  by @Arthie in https://github.com/vitest-dev/vitest/issues/9940 [<samp>(b3c99)</samp>](https://github.com/vitest-dev/vitest/commit/b3c992cb2) - **pretty-format**: Fix output limit over counting  -  by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/9965 [<samp>(d3b7a)</samp>](https://github.com/vitest-dev/vitest/commit/d3b7a40fa) - Disable colors if agent is detected  -  by @sheremet-va and @AriPerkkio in https://github.com/vitest-dev/vitest/issues/9851 [<samp>(6f97b)</samp>](https://github.com/vitest-dev/vitest/commit/6f97b55dd) #####     [View changes on GitHub](https://github.com/vitest-dev/vitest/compare/v4.1.1...v4.1.2)

← Older Version Vitest v4.1.1 Newer Version → Vitest v4.1.3