import { SNSSQSSubscriber, SNSSQSSubscriberConfig } from './sns_sqs_subscriber';
import { SNSMessage } from './sqs_queue';
import { MessageSource } from './';
/**
 * Acts as a message source from an SQS queue that is subscribed to an SNS topic. This class will ensure that
 * the queue is subscribed to the topic, and then hand off SQS operations to an SQSQueue.
 */
export declare class SNSSQSQueue extends SNSSQSSubscriber implements MessageSource<SNSMessage> {
    private sqsQueue;
    constructor(config: SNSSQSSubscriberConfig);
    initialize(): Promise<void>;
    getNext(): Promise<SNSMessage>;
    complete(message: SNSMessage): Promise<void>;
    backoff(message: SNSMessage): Promise<number>;
    delay(message: SNSMessage, delaySecs: number): Promise<number>;
    isReady(): boolean;
}