Vitest coverage for workerthread files

[JrSt2806]

I am working on a uni project and need coverage for my nodeJS project.
When testing code that is only called within a worker thread coverage seems to break.

My tests succeed but when running vitest run --coverage all worker thread files aren't shown in the coverage report.

Does anyone now for a work around for this?
My tests are running inside node v22.15.0 with vitest 4.0.6, and using @vitest/coverage-v8: "4.0.6"

P.S. I have seen some similar issues but non of them gave a solution.

Thanks very much

[AriPerkkio]

This is not yet possible with Vitest. We have some plans how to implement this though.

[JrSt2806]

Thank you very much for the reply!

[AriPerkkio]

This will be fixed by

• feat(coverage): v8 to track node:child_process and node:worker_threads contexts #9976

There is a preview build available in #9976 (comment).