import { SendMessageCommand, ReceiveMessageCommand, DeleteMessageCommand, ChangeMessageVisibilityCommand } from "@aws-sdk/client-sqs";
interface StoredMessage {
    MessageId: string;
    Body: string;
    ReceiptHandle: string;
    MessageAttributes?: Record<string, {
        StringValue: string;
    }>;
    sentAt: Date;
    delaySeconds: number;
    visible: boolean;
    visibilityTimeoutUntil?: Date;
}
export declare class TestSQSClient {
    private messages;
    private nextMessageId;
    private nextReceiptHandle;
    sentMessages: Array<{
        QueueUrl: string;
        MessageBody: string;
        DelaySeconds?: number;
        MessageAttributes?: Record<string, {
            StringValue: string;
            DataType: string;
        }>;
    }>;
    deletedMessages: Array<{
        MessageId: string;
        ReceiptHandle: string;
    }>;
    send(command: SendMessageCommand | ReceiveMessageCommand | DeleteMessageCommand | ChangeMessageVisibilityCommand): Promise<any>;
    private handleSendMessage;
    private handleReceiveMessage;
    private handleDeleteMessage;
    private handleChangeMessageVisibility;
    getAllMessages(): StoredMessage[];
    clear(): void;
}
export {};