Vitest v0.34.5 — 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

✨ Features 5 ⚡ Improvements 1 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Vitest v0.34.5. 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 (5)

Add `diff` option  -  by @fenghan34 and @sheremet-va in https://github.com/vitest-dev/vitest/issues/4063 <samp>(b50cf)</samp>
Add `coverage['100']` to istanbul provider  -  by @marcelobotega in https://github.com/vitest-dev/vitest/issues/4109 <samp>(a7e09)</samp>
Support `vi.waitFor` method  -  by @Dunqing and @sheremet-va in https://github.com/vitest-dev/vitest/issues/4113 <samp>(d79cb)</samp>
Allow using unprocessed environment files  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4098 <samp>(1aee1)</samp>
Support `vi.waitUntil` method  -  by @Dunqing and @sheremet-va in https://github.com/vitest-dev/vitest/issues/4129 <samp>(e0ac9)</samp>

⚡ Performance & Enhancements (1)

Use lazy require in vm pool  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4136 <samp>(21ba4)</samp>

🔧 Bug Fixes & Patches (6)

Update HappyDOMOptions to be compatible with v12  -  by @anthonyblond in https://github.com/vitest-dev/vitest/issues/4135 <samp>(e8797)</samp>
Print value shape when .resolves and .rejects fails  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4137 <samp>(e649d)</samp>
Fix lint errors on onConsoleLog example  -  by @marcelobotega in https://github.com/vitest-dev/vitest/issues/4116 <samp>(ba1e7)</samp>
Improve the error message when nothing is thrown when testing `toThrow`  -  by @Dunqing in https://github.com/vitest-dev/vitest/issues/3979 <samp>(725a0)</samp>
Catch errors in happy-dom  -  by @capricorn86 in https://github.com/vitest-dev/vitest/issues/4140 <samp>(c21c0)</samp>
Restore leading space in `testNamePattern`  -  by @segrey in https://github.com/vitest-dev/vitest/issues/4103 and https://github.com/vitest-dev/vitest/issues/4104 <samp>(3c305)</samp>

📄 View Raw Release Notes (Original Developer Log)

###    🚀 Features - **config**: - Add `diff` option  -  by @fenghan34 and @sheremet-va in https://github.com/vitest-dev/vitest/issues/4063 [<samp>(b50cf)</samp>](https://github.com/vitest-dev/vitest/commit/b50cf7ad) - **coverage**: - Add `coverage['100']` to istanbul provider  -  by @marcelobotega in https://github.com/vitest-dev/vitest/issues/4109 [<samp>(a7e09)</samp>](https://github.com/vitest-dev/vitest/commit/a7e09939) - **vitest**: - Support `vi.waitFor` method  -  by @Dunqing and @sheremet-va in https://github.com/vitest-dev/vitest/issues/4113 [<samp>(d79cb)</samp>](https://github.com/vitest-dev/vitest/commit/d79cb44b) - Allow using unprocessed environment files  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4098 [<samp>(1aee1)</samp>](https://github.com/vitest-dev/vitest/commit/1aee13af) - Support `vi.waitUntil` method  -  by @Dunqing and @sheremet-va in https://github.com/vitest-dev/vitest/issues/4129 [<samp>(e0ac9)</samp>](https://github.com/vitest-dev/vitest/commit/e0ac97cf) ###    🐞 Bug Fixes - Update HappyDOMOptions to be compatible with v12  -  by @anthonyblond in https://github.com/vitest-dev/vitest/issues/4135 [<samp>(e8797)</samp>](https://github.com/vitest-dev/vitest/commit/e8797534) - Print value shape when .resolves and .rejects fails  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4137 [<samp>(e649d)</samp>](https://github.com/vitest-dev/vitest/commit/e649d78f) - **docs**: - Fix lint errors on onConsoleLog example  -  by @marcelobotega in https://github.com/vitest-dev/vitest/issues/4116 [<samp>(ba1e7)</samp>](https://github.com/vitest-dev/vitest/commit/ba1e7335) - **expect**: - Improve the error message when nothing is thrown when testing `toThrow`  -  by @Dunqing in https://github.com/vitest-dev/vitest/issues/3979 [<samp>(725a0)</samp>](https://github.com/vitest-dev/vitest/commit/725a0146) - **happy-dom**: - Catch errors in happy-dom  -  by @capricorn86 in https://github.com/vitest-dev/vitest/issues/4140 [<samp>(c21c0)</samp>](https://github.com/vitest-dev/vitest/commit/c21c0efa) - **runner**: - Restore leading space in `testNamePattern`  -  by @segrey in https://github.com/vitest-dev/vitest/issues/4103 and https://github.com/vitest-dev/vitest/issues/4104 [<samp>(3c305)</samp>](https://github.com/vitest-dev/vitest/commit/3c305857) - `test.extend` doesn't work in hooks without test  -  by @Dunqing in https://github.com/vitest-dev/vitest/issues/4065 [<samp>(175c7)</samp>](https://github.com/vitest-dev/vitest/commit/175c752d) - **snapshot**: - Support mix of normal/with placeholders snapshots  -  by @RobertPechaCZ in https://github.com/vitest-dev/vitest/issues/4118 [<samp>(01e01)</samp>](https://github.com/vitest-dev/vitest/commit/01e01bfc) - **ui**: - Correctly render ansi diff  -  by @so1ve and @sheremet-va in https://github.com/vitest-dev/vitest/issues/3810 [<samp>(8c315)</samp>](https://github.com/vitest-dev/vitest/commit/8c3152fa) - **vite-node**: - Export `SourceMapInput` to fix CYCLIC_CROSS_CHUNK_REEXPORT  -  by @Dunqing in https://github.com/vitest-dev/vitest/issues/4128 [<samp>(ca70a)</samp>](https://github.com/vitest-dev/vitest/commit/ca70a779) - Align vite dependency version with vitest  -  by @sheremet-va [<samp>(90ff8)</samp>](https://github.com/vitest-dev/vitest/commit/90ff899b) - **vitest**: - Rerun tests if a file loaded with query changes  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4130 [<samp>(a084c)</samp>](https://github.com/vitest-dev/vitest/commit/a084ceaf) - Inject "define" in workspaces  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4096 [<samp>(b4d5a)</samp>](https://github.com/vitest-dev/vitest/commit/b4d5ae23) ###    🏎 Performance - Use lazy require in vm pool  -  by @sheremet-va in https://github.com/vitest-dev/vitest/issues/4136 [<samp>(21ba4)</samp>](https://github.com/vitest-dev/vitest/commit/21ba4935) #####     [View changes on GitHub](https://github.com/vitest-dev/vitest/compare/v0.34.4...v0.34.5)

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