Adding «@sveltejs/adapter-cloudflare» to a projects makes vitetest hang (even on v5.0.1)

[jornki]

Describe the bug

This can be recreated by setting up a default project using npx sv create.

Steps:

• npx sv create
• Choose SvelteKit minimal
• Use Typescript -> Yes
• What would you like to add to your project?
  • vitest
  • sveltekit-adapter
• Which SvelteKit adapter would you like to use?
  • cloudflare-pages
• Package manager -> pnpm
• cd into the project and run pnpm test

Result

close timed out after 10000ms
Tests closed successfully but something prevents Vite server from exiting

Remove/don't add the «adapter-cloudflare» and the tests run fine.

Reproduction

Repo with reproduction: https://github.com/jornki/cf-adapter-bug

Output from pnpm list

devDependencies:
@sveltejs/adapter-cloudflare 5.0.1
@sveltejs/kit 2.16.1
@sveltejs/vite-plugin-svelte 5.0.3
svelte 5.19.2
svelte-check 4.1.4
typescript 5.7.3
vite 6.0.11
vitest 3.0.4

Logs

System Info

MacOS 15.2
Tested in Terminal

Severity

annoyance

Additional Information

No response