/**
 * Fire-and-forget
 *
 * Runs a callback without blocking the caller. Used for hooks that must
 * never affect the response Twilio (or the caller) is waiting on -
 * `onMessage` and `onMessageStatus` both fire this way.
 */
export declare function fireAndForget(run: () => void | Promise<void>, onError: (error: unknown) => void): void;