import type DomainEvent from "./DomainEvent";
/**
 * Metadata entry for domain events.
 * Key-value pairs for storing contextual information about events.
 */
export type EventMetadata = Record<string, unknown>;
/**
 * Wrapper for domain events that adds metadata for event sourcing.
 *
 * DomainMessage encapsulates a domain event along with:
 * - Aggregate ID (uuid) - derived from event.aggregateId
 * - Sequence number (playhead)
 * - Occurrence timestamp - derived from event.occurredAt
 * - Idempotency key
 * - Optional metadata
 *
 * The event property accepts both DomainEvent instances and plain objects
 * to support deserialization from event stores where events lose their
 * class prototypes after JSON serialization.
 *
 * Note: uuid and occurred are derived from the event's aggregateId and occurredAt.
 * This ensures consistency between the event and its metadata wrapper.
 *
 * @internal
 */
export default class DomainMessage {
    readonly uuid: string;
    readonly playhead: number;
    readonly event: DomainEvent;
    readonly metadata: EventMetadata[];
    readonly occurred: Date;
    static create(uuid: string, playhead: number, event: DomainEvent, metadata?: EventMetadata[], occurred?: Date, idempotencyKey?: string): DomainMessage;
    readonly eventType: string;
    readonly idempotencyKey: string;
    private constructor();
    private static extractEventType;
}