API reference
closeout/signal-exit/signals
Every export of closeout/signal-exit/signals, with its signature and doc comment: signals.
closeout/exit-hook
Every export of closeout/exit-hook, with its signature and doc comment: asyncExitHook, gracefulExit, exitHook, plus 3 types.
FAQ
Short answers about closeout — SIGKILL, process.exit, async handlers, the deadline, exit codes, owning a signal, Windows, CommonJS and the drop-ins — each with where to read more.