chore(jest-runner): Add info regarding timers to forceExited message #12083
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silverwind
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silverwind
changed the title
When a test finishes while a Node.js timer is still active, the worker process will have to be force-killed by jest because the active timer will keep the event loop alive. It is often not immediately clear that such timers are the issue for this message and the suggested method of `--detectOpenHandles` will never detect them. Add a helpful message to point the user to this potential issue. Ref: https://nodejs.org/api/timers.html#timeoutunref
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Summary
When a test finishes while a Node.js timer is still active, the worker process will have to be force-killed by jest because the active timer will keep the event loop alive.
It is often not immediately clear that such timers are the issue for this message and the suggested method of
--detectOpenHandleswill never detect them. Add a helpful message to point the user to this potential issue.Ref: https://nodejs.org/api/timers.html#timeoutunref
Test plan
None, It's just a small addition to a warning message.