readonly id?: number
readonly threadId?: number
/**
- * Register an event listener.
+ * Registers an event listener.
*
* @param event - The event.
* @param handler - The event handler.
((event: 'online', handler: OnlineHandler<this>) => void) &
((event: 'exit', handler: ExitHandler<this>) => void)
/**
- * Register a listener to the exit event that will only be performed once.
+ * Registers a listener to the exit event that will only be performed once.
*
* @param event - `'exit'`.
* @param handler - The exit handler.