post request results in timeout when providing body, header, or both

Prerequisites

• I confirm my issue is not in the opened issues
• I confirm the Frequently Asked Questions didn’t contain the answer to my issue

Environment check

• I’m using the latest msw version
• I’m using Node.js version 14 or higher

Node.js version

14 / 16

Reproduction repository

https://codesandbox.io/s/laughing-ully-x4wt2w

Reproduction steps

open provided CodeSandbox and run npm test; only the test case executing a POST request with neither body nor header provided succeeds, the others fail

Current behavior

When providing data (i.e. body) to a POST request, the test ends in a timeout. A breakpoint within the request handler of the ‘mocked server’ is not even reached.

The exact same request when used against a ‘real’ nodeJS server (express)

Expected behavior

The tests should not result in a timeout and instead get processed by the handler.

I can not rule out, that my set up is wrong, however i followed the instructions to the best of my knowledge and understanding

[josuevalrob]

oh fck, same issue for me

[mbastian93]

Okay i just noticed: when using jest/babel-jest v^26.0.0 it works as expect. Therefore there must be an issue with v27 of those libaries