/**
 * NATS transport.
 */
export default class NatsTransport {
    private options;
    private client;
    /**
     * Create new NATS transport.
     */
    constructor(options?: any);
    /**
     * Transport listen.
     */
    listen(callback: Function): void;
    /**
     * Publish to a topic.
     */
    publish(topic: string, message: any): void;
    /**
     * Subscribe to a topic.
     */
    subscribe(topic: string, group: string, callback: Function): number;
    /**
    * Unsubscribe from a topic.
    */
    unsubscribe(sid: number, max?: number): void;
    /**
     * Transport handle.
     */
    handle(route: string, group: string, callback: Function): void;
    /**
     * Client request.
     * Nats client implements this pattern out of the box.
     * Publish a request with an implicit inbox listener as the response.
     * This should be treated as a subscription.
     */
    request(route: string, payload: any, callback: Function, timeout?: number): void;
    /**
     * Close connection.
     */
    close(): void;
}