/**
 * CleanKill hooks the interrupt handler, and provides callbacks for your code
 * to cleanly shut down before the process exits.
 */
/**
 * The type of a cleankill interrupt handler.
 */
export declare type Handler = (doneHandling: () => void) => void;
/**
 * Register a handler to occur on SIGINT. All handlers are passed a callback,
 * and the process will be terminated once all handlers complete.
 */
export declare function onInterrupt(handler: Handler): void;
/**
 * Call all interrupt handlers, and call the callback when they all complete.
 *
 * Removes the list of interrupt handlers.
 */
export declare function close(done: () => void): void;
/**
 * Calls all interrupt handlers, then exits with exit code 0.
 *
 * If called more than once it skips waiting for the interrupt handlers to
 * finish and exits with exit code 1.
 *
 * This function is called when a SIGINT is received.
 */
export declare function interrupt(): void;