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AST based V8 code coverage is finally here! I thought of this feature first time over 2 years ago, but knew it would require so much work that I couldn't finish it by working on Vitest just on weekends. Ever since @stackblitz.com hired me to work on Vitest I knew I could finish features like this.

Vitest@vitest.dev

Vitest 3.2 is out! - New Annotations API - Scoped Fixtures - Custom Browser Locators API - Test Signal - Better V8 Coverage Result And many more features! vitest.dev/blog/vitest-...

2/6/25, 5:37 pm7 reposts64 likes

Goat.

Please give this feature a try by enabling `coverage.experimentalAstAwareRemapping` and leave feedback at github.com/vitest-dev/v....

github.comEnable V8 coverage's `experimentalAstAwareRemapping` by default and remove old remapping mode · Issue #7928 · vitest-dev/vitestNoteFeel free to comment your experience with coverage.experimentalAstAwareRemapping option. We are especially interested to hear about bad experiences. You can also leave a 👍 reaction to indicate ...

AriPerkkio

@ariperkkio.dev

2 June 2025

For this feature we needed completely new way to process V8 code coverage results. The final library is built in a way that it can be utilized by other test runners too - there is nothing Vitest specific! github.com/AriPerkkio/a...

github.comGitHub - AriPerkkio/ast-v8-to-istanbul: AST-aware v8-to-istanbulAST-aware v8-to-istanbul. Contribute to AriPerkkio/ast-v8-to-istanbul development by creating an account on GitHub.

StackBlitz

@stackblitz.com

2 June 2025

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