+ readonly unref?: () => void
+ /**
+ * Stop all JavaScript execution in the worker thread as soon as possible.
+ * Returns a Promise for the exit code that is fulfilled when the `'exit' event` is emitted.
+ */
+ readonly terminate?: () => Promise<number>
+ /**
+ * Cluster worker disconnect.
+ */
+ readonly disconnect?: () => void
+ /**
+ * Cluster worker kill.
+ */
+ readonly kill?: (signal?: string) => void