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Upgrading @vitest/coverage-v8 0.33 to 0.34

Breaking0.33.0 → 0.34.6Breaking7Security2Deprecated1New12Changed3Fixed71Other3

Full comparisonBack to @vitest/coverage-v8
BreakingUpgrade verdict

7 breaking changes and 2 security fixes.

In plain terms
  • Custom test environments can no longer point to TypeScript files or use import paths that Vite would need to process.
  • Coverage reports are no longer generated when tests fail unless you turn the option back on.
  • The old coverage package for c8 is gone; use the v8 coverage package instead.
  • Dependency settings have moved under a new server option, and the old location still works but warns.
Must act Top 5 of 10 that need code or config changes

What you must change

Breaking7
Custom environments must be processed before Vitest consumes them, so TS file paths and Vite-processed import paths no longer work.
0.34.0GitHub ReleaseSummarizedView source
Disables coverage.reportOnFailure by default.
coverage.reportOnFailure
0.34.0GitHub ReleaseSummarizedView source
Removes the @vitest/coverage-c8 package in favor of @vitest/coverage-v8.
@vitest/coverage-c8@vitest/coverage-v8
0.34.0GitHub ReleaseSummarizedView source
Introduces the server option and moves most deps options to server.deps with a deprecation warning.
serverserver.depsdeps.optimizerdeps.inlinedeps.external
0.34.0GitHub ReleaseSummarizedView source
vite-node CLI arguments must now come before the entry point, matching node/tsx/ts-node.
vite-node
0.34.0GitHub ReleaseSummarizedView source
Enables deps.optimizer by default and removes its experimental status.
deps.optimizeroptimizeDepsssr.optimizeDeps
0.34.0GitHub ReleaseSummarizedView source
Transform mode now affects only test files, not regular files; transformMode moves to server.transformMode.
transformModeserver.transformModetestTransformMode
0.34.0GitHub ReleaseSummarizedView source
Security2
Restricts access to the file system via the API.
0.34.2GitHub ReleaseSummarizedView source
Updates istanbul-lib-instrument to v6 to fix a vulnerable dependency.
istanbul-lib-instrument
0.34.0GitHub ReleaseSummarizedView source

Deprecations to plan for

Deprecated1
Deprecates deps.registerNodeLoader in favor of deps.optimizer.web or server.deps.inline.
deps.registerNodeLoaderdeps.optimizer.webserver.deps.inline
0.34.0GitHub ReleaseSummarizedView source