Testing with jest and jest-environment-jsdom using undici - error: ReferenceError: ReadableStream is not defined

[Roman-e-prog]

I have installed msw 2.0.2 into a next.js 13.4.10 project that will be tested with jest. I had several errors and followed the instructions from the msw docs. There I was told to build a jest.polyfills.js in the root of the project and that I should install undici. This I have done and coppied the code from the docs. Now I have this error when running a jest test. ReadableStream is not defined. I am not familiar with this undici library, not used polyfills until yet and just starting with msw. So I not know how I should deal with this. I don't want to build a custom test environment. Adding ReadableStream to the polyfill like this not worked:

import { ReadableStream } from 'web-streams-polyfill/ponyfill'
global.ReadableStream = ReadableStream

Is there another solution from msw? Perhaps someone can advice me?

Current error:
Test suite failed to run

ReferenceError: ReadableStream is not defined

  19 | const { Blob } = require('node:buffer')
  20 | const { fetch, Headers, FormData, Request, Response } = require('undici')
> 21 |
     | ^
  22 | Object.defineProperties(globalThis, {
  23 |   fetch: { value: fetch, writable: true },
  24 |   Blob: { value: Blob },

  at Object.<anonymous> (node_modules/undici/lib/fetch/response.js:506:3)       
  at Object.<anonymous> (node_modules/undici/index.js:118:27)
  at Object.<anonymous> (jest.polyfills.js:21:57)

[mattcosta7]

I think there's a change in unidic v6 that we haven't dug into yet, try with v5 instead and let us know if that doesn't help?

[mattcosta7]

#1916 (comment)

this also should work, but the order matters (ReadableStream has to be set earlier than unidici's import