Heisenbug - hang disappears if I import this library

[kevinburke]

I'm trying to debug an issue where sending SIGINT to the running process results in a hang - the process refuses to exit.

However, the mere act of adding a require for this library causes the issue to disappear.

The actual hang is somewhere in a mess of webpack-serve, webpack-dev-middleware, webpack, and something called thread-loader.

Do you have any hypotheses for why that could happen?

[kevinburke]

Specifically if I import this library - the process always exits with a write EPIPE or "This socket has been ended by the other party," presumably between a thread-loader WorkerPool communicating with its children. If I do not import this library it exits with one of those errors 15% of the time and hangs ~85% of the time.