import { EventEmitter } from 'events';
export declare class IdempotencyStore extends EventEmitter {
    private processedMessages;
    private readonly TTL_MS;
    private cleanupInterval?;
    constructor();
    private startCleanupInterval;
    dispose(): void;
    markAsProcessed(messageId: string, result?: any): Promise<void>;
    hasBeenProcessed(messageId: string): Promise<{
        processed: boolean;
        result?: any;
    }>;
    private cleanup;
}