Vitest v4.0.2 — 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 4

⚡ Executive Summary (TL;DR)

Vitest v4.0.2. Source highlight:    🐞 Bug Fixes

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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 (4)

Don't print the deprecation notice in node_modules  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8779 <samp>(588f7)</samp>
Assign envs before running tests to keep in sync with process.env  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8769 <samp>(26ce8)</samp>
Properly inherit implementation's `length`  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8778 <samp>(d4c2b)</samp>
Reset spies if both `restoreMocks` and `mockReset` are set in the config  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8781 <samp>(2eedb)</samp>

📄 View Raw Release Notes (Original Developer Log)

###    🐞 Bug Fixes - **browser**: - Don't print the deprecation notice in node_modules  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8779 [<samp>(588f7)</samp>](https://github.com/vitest-dev/vitest/commit/588f76858) - **pool**: - Assign envs before running tests to keep in sync with process.env  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8769 [<samp>(26ce8)</samp>](https://github.com/vitest-dev/vitest/commit/26ce88db6) - **spy**: - Properly inherit implementation's `length`  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8778 [<samp>(d4c2b)</samp>](https://github.com/vitest-dev/vitest/commit/d4c2b280b) - Reset spies if both `restoreMocks` and `mockReset` are set in the config  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/8781 [<samp>(2eedb)</samp>](https://github.com/vitest-dev/vitest/commit/2eedbce76) #####     [View changes on GitHub](https://github.com/vitest-dev/vitest/compare/v4.0.1...v4.0.2)

← Older Version Vitest v4.0.1 Newer Version → Vitest v4.0.3