---
description: The Workers Vitest integration package has been renamed for version 1.
title: "@cloudflare/vitest-pool-workers is now @cloudflare/vitest-plugin"
image: https://developers.cloudflare.com/changelog/post/2026-08-19-vitest-plugin/og.png?v=a0cfef2664a63cca
---

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August 19, 2026

## @cloudflare/vitest-pool-workers is now @cloudflare/vitest-plugin

[Workers](https://developers.cloudflare.com/workers/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-08-19-vitest-plugin/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

Version 1 of the Workers Vitest integration is published as [`@cloudflare/vitest-plugin` ↗︎](https://www.npmjs.com/package/@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:

npmyarnpnpm

```
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](https://developers.cloudflare.com/workers/testing/vitest-integration/migration-guides/migrate-to-vitest-plugin/).

For outbound request mocks in Workers tests, use the [`@msw/cloudflare` ↗︎](https://github.com/mswjs/cloudflare) integration. Refer to [Mock outbound requests](https://developers.cloudflare.com/workers/testing/vitest-integration/mock-outbound-requests/).

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```