import { DeliveryStatus } from '../../enumerations/messaging/deliveryStatus';
import { IMessageMetadata } from '../../interfaces/messaging/messageMetadata';
import { IMessageMetadataStore, MessageQuery, MessageQueryOptions } from '../../interfaces/messaging/messageMetadataStore';
import { MemoryBlockMetadataStore } from '../memoryBlockMetadataStore';
/**
 * In-memory implementation of IMessageMetadataStore.
 *
 * @remarks
 * Extends MemoryBlockMetadataStore with message-specific operations.
 * Uses Map for fast lookups and filtering.
 *
 * @see Requirements 1.3, 9.1, 9.2, 9.3, 9.4, 9.5, 10.2
 */
export declare class MemoryMessageMetadataStore extends MemoryBlockMetadataStore implements IMessageMetadataStore {
    private readonly messageMetadata;
    storeMessageMetadata(metadata: IMessageMetadata): Promise<void>;
    queryMessages(query: MessageQuery): Promise<IMessageMetadata[]>;
    updateDeliveryStatus(messageId: string, recipientId: string, status: DeliveryStatus): Promise<void>;
    recordAcknowledgment(messageId: string, recipientId: string, timestamp: Date): Promise<void>;
    getMessagesByRecipient(recipientId: string, options?: MessageQueryOptions): Promise<IMessageMetadata[]>;
    getMessagesBySender(senderId: string, options?: MessageQueryOptions): Promise<IMessageMetadata[]>;
    private cloneMessageMetadata;
}
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