Version

Node >=v19

Steps to reproduce

1. Clone enisdenjo/jest-fetch-leak repo
2. Read its readme for local repro
3. Check out the GitHub Actions for CI repo

Expected behavior

Doesn't leak ever.

Actual behavior

Leaks in Node >=v19 when test is repeated enough times.

Additional context

⚠️ Not really sure whether this issue belongs here or on Jest's repo. But, I have a hunch that it belongs here given that we're experiencing memory spikes with Node >=v19 in production. Nevertheless, I've opened an issue there too.

If a test, which uses native fetch, is iterated enough times in Node >=v19, Jest's --detectLeaks will report a memory leak.

This behaviour does not happen on Node <=v18.

Please check the leak detector tests in the CI.

Environment

ubuntu-latest from GitHub Actions