Post
AriPerkkio
ariperkkio.dev
did:plc:byf3ophennvornfu775fvm42
Latest work on Vitest's istanbuljs fork removed Babel from coverage-istanbul. Instrumentation is now done with packages that Vitest dep graphs already have: magic-string and rolldown, similar to Vite's own SSR transform. Surprisingly this dep trim improved instrumentation speed 5-10x.
https://github.com/vitest-dev/istanbuljs/releases/tag/v2.0.0
2026-10-19T17:31:21.158Z