import type { DeadLetterMessage } from "./DeadLetterMessage";
import type IDeadLetterQueue from "./IDeadLetterQueue";
/**
 * In-memory implementation of the dead letter queue.
 * Suitable for development and testing purposes.
 */
export default class InMemoryDeadLetterQueue implements IDeadLetterQueue {
    private readonly messages;
    add(message: DeadLetterMessage): Promise<void>;
    get(messageId: string): Promise<DeadLetterMessage | undefined>;
    getAll(): Promise<DeadLetterMessage[]>;
    remove(messageId: string): Promise<void>;
    update(message: DeadLetterMessage): Promise<void>;
    count(): Promise<number>;
    clear(): Promise<void>;
}