import type { Identifier } from './Identifier.ts';
export interface IMessage<TPayload = unknown> {
    /** Event or command type */
    type: string;
    /** Target aggregate identifier for commands, originating aggregate identifier for events */
    aggregateId?: Identifier;
    /** Aggregate version at the time of the message */
    aggregateVersion?: number;
    /** Starter event ids of sagas associated with this message, keyed by saga descriptor */
    sagaOrigins?: Record<string, string>;
    /** Business data */
    payload: TPayload;
    /** Optional metadata/context (e.g. auth info, request id); set on commands, copied to events */
    context?: any;
}
export declare const isMessage: (obj: unknown) => obj is IMessage;