🐛 BUG: jest-image-snapshot is not work with the new vitest integration

[ducan-ne]

Which Cloudflare product(s) does this pertain to?

Workers Vitest Integration

What version(s) of the tool(s) are you using?

"@cloudflare/vitest-pool-workers": "^0.1.19", "wrangler": "3.37.0"

What version of Node are you using?

20.12.1

What operating system and version are you using?

Mac Sonoma 14

Describe the Bug

Observed behavior

I want to test if my image response from worker is valid or not but couldn't make it work with jest-image-snapshot, AFAIK it's the only solution for image snapshot https://vitest.dev/guide/snapshot#image-snapshots

The error I got

Error: No such module "node:child_process".

Expected behavior

It should works like the default setting of vitest

Steps to reproduce

Please provide the following:

• A simple worker return image
• install jest-image-snapshot
• extend the matcher with expect.extend({ toMatchImageSnapshot })
• Run test

Please provide a link to a minimal reproduction

No response

Please provide any relevant error logs

No response

[vladinator1000]

I encountered a similar bug when importing stuff from zx:

import { glob, fs, path } from 'zx'

Error: No such module "node:child_process".
  imported from "home/vlady/code/yupty/api/node_modules/zx/build/core.js"

[DerZade]

Might be fixed by this:
https://github.com/cloudflare/workers-sdk/releases/tag/%40cloudflare%2Fvitest-pool-workers%400.6.14

[penalosa]

Closing this, since jest-image-snapshot is not compatible with Workers. The node:child_process import error you hit indicates that jest-image-snapshot spawns subprocesses to perform diffing, which isn't (and won't be) supported in Workers. It's also since been removed from the Vitest docs.

That said, #13091 bumps the RTTI compatibility date used by vitest-pool-workers so that node:child_process (and other recently-added Node.js module stubs) are now correctly recognized as workerd builtins. This means libraries that import child_process but don't actually call exec/spawn in their codepath will no longer crash at import time.

I've also opened cloudflare/cloudflare-docs#29395 to document this as a known issue.