⚠️ Breaking Change
Impact Score: 7/10
Vitest v0.14.0 — 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: 2026-11-01.
Breaking-change evidence from the source
Breaking Changes * **vite-node:** use `.mjs` for esm build ([692ad34](https://github.com/vitest-dev/vitest/commit/692ad34))
⚡ Executive Summary (TL;DR)
Vitest v0.14.0. Source highlight: **vite-node:** use `.mjs` for esm build (692ad34)
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.
⚠️ Breaking Changes & Deprecations (1)
- Breaking Changes * **vite-node:** use `.mjs` for esm build ([692ad34](https://github.com/vitest-dev/vitest/commit/692ad34))
✨ New Features & Capabilities (1)
- improve watcher performance, add forceRerunTriggers option, `watchIgnore` is renamed to `watchExclude` and now accepts only glob patterns (#1424) (3f5ff5b)
🔧 Bug Fixes & Patches (5)
- repair TestFunction return type. (#1408) (f169f5a)
- don't escape quotes for objects in difference view (#1435) (1560417)
- **types:** add callable type to vi.spyOn (#1432) (17dfd39)
- **types:** add explicit extension for ESM compatibility (#1417) (4b54aed)
- **vite-node:** Prevent crash when passing single module as options (#1406) (ab8f004)
📄 View Raw Release Notes (Original Developer Log)
## Breaking Changes
* **vite-node:** use `.mjs` for esm build ([692ad34](https://github.com/vitest-dev/vitest/commit/692ad34))
* remove `"type": "module"` from vitest/package.json ([#1411](https://github.com/vitest-dev/vitest/issues/1411)) ([b4a9b0b](https://github.com/vitest-dev/vitest/commit/b4a9b0b)), closes [#325](https://github.com/vitest-dev/vitest/issues/325)
* **vite-node:** respect ssr field, allow inlining everything ([#1434](https://github.com/vitest-dev/vitest/issues/1434)) ([fd57b0e](https://github.com/vitest-dev/vitest/commit/fd57b0e))
* improve watcher performance, add forceRerunTriggers option, `watchIgnore` is renamed to `watchExclude` and now accepts only glob patterns ([#1424](https://github.com/vitest-dev/vitest/issues/1424)) ([3f5ff5b](https://github.com/vitest-dev/vitest/commit/3f5ff5b))
### Bug Fixes
* repair TestFunction return type. ([#1408](https://github.com/vitest-dev/vitest/issues/1408)) ([f169f5a](https://github.com/vitest-dev/vitest/commit/f169f5a))
* don't escape quotes for objects in difference view ([#1435](https://github.com/vitest-dev/vitest/issues/1435)) ([1560417](https://github.com/vitest-dev/vitest/commit/1560417))
* **types:** add callable type to vi.spyOn ([#1432](https://github.com/vitest-dev/vitest/issues/1432)) ([17dfd39](https://github.com/vitest-dev/vitest/commit/17dfd39))
* **types:** add explicit extension for ESM compatibility ([#1417](https://github.com/vitest-dev/vitest/issues/1417)) ([4b54aed](https://github.com/vitest-dev/vitest/commit/4b54aed))
* **vite-node:** Prevent crash when passing single module as options ([#1406](https://github.com/vitest-dev/vitest/issues/1406)) ([ab8f004](https://github.com/vitest-dev/vitest/commit/ab8f004))