frequent MaxListenersExceededWarnings when running test suite

[boneskull]

TypeScript Version: master

Search Terms: MaxListenersExceededWarning, EventEmitter leak, leak

Code n/a

Expected behavior:

Running gulp runtests-parallel does not result in leak warnings

Actual behavior: Many leaks, e.g.

[Worker 0] (node:98823) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 unhandledRejection listeners added to [process]. Use emitter.setMaxListeners() to increase limit

[Worker 1] (node:98824) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 uncaughtException listeners added to [process]. Use emitter.setMaxListeners() to increase limit

Playground Link: n/a

Related Issues: mochajs/mocha#4329, PR #41403

This may be a duplicate, but I have created it for #41403.

[DanielRosenwasser]

I get this all the time on Codespaces containers...