Wrangler crashes with "fileURLToPath undefined" when using uuid@11 (ESM) in Workers

[abrtwcom]

What versions & operating system are you using?

OS: Debian 13 (Linux x86_64)
Node.js: v20.x
npm: v10.x
Wrangler: 4.59.0 (update available 4.59.2)
Workers compatibility date: 2026-01-16 (falls back to 2026-01-11)

Please provide a link to a minimal reproduction

Not yet available. The issue occurs in a Cloudflare Worker using uuid@11 (ESM). I can provide a minimal reproduction repository if required.

Describe the Bug

Description

Running wrangler dev or wrangler deploy crashes during Workers runtime startup
(not during build time) with the following error.

The same code works correctly in a normal Node.js environment.

---

Steps to Reproduce

1. Create a Cloudflare Worker (ESM)
2. Install uuid v11:

   npm install uuid@11
   
   
   
   

Please provide any relevant error logs

Additional note:
This appears related to uuid@11 using Node-specific fileURLToPath logic,
which may not be supported in the Workers runtime environment.
Downgrading uuid or using crypto.randomUUID() may work as a workaround.

[abrtwcom]

Additional context:

This error consistently reproduces with uuid@11.x in a Workers (ESM) environment.
The stack trace points to uuid/dist/esm/native.js calling Node-specific
fileURLToPath, which appears unsupported in the Workers runtime.

As a workaround:

• Downgrading to uuid@9 avoids the crash
• Replacing uuid usage with crypto.randomUUID() also works correctly

Happy to provide a minimal reproduction repository if needed.

[emily-shen]

Hi, that's odd as fileURLToPath should be supported and I don't seem to be able to reproduce this with a worker using uuid@11 (and the latest compat date) - can you provide a link to a github repo with a reproduction?