Changelog

Version 1 of the Workers Vitest integration is published as @cloudflare/vitest-plugin ↗. The package was formerly named @cloudflare/vitest-pool-workers.

The Vitest configuration API is unchanged. Existing projects must update the dependency name, package imports, and TypeScript types entries.

To migrate automatically, run:

npx @cloudflare/codemods vitest:pool-workers-to-vitest-plugin

yarn @cloudflare/codemods vitest:pool-workers-to-vitest-plugin

pnpm @cloudflare/codemods vitest:pool-workers-to-vitest-plugin

The codemod updates your dependency, imports, and test TypeScript configuration. For manual migration steps, refer to Migrate to Vitest plugin.

For outbound request mocks in Workers tests, use the @msw/cloudflare ↗ integration. Refer to Mock outbound requests.