import type { BridgeMessage, BridgeTransport } from '../types/agent-bridge.js';
/**
 * In-memory pub/sub transport for agent-to-agent messaging.
 * Subscribers register by agentId and receive messages via callback.
 */
export declare class InMemoryBridgeTransport implements BridgeTransport {
    private readonly subs;
    send(msg: BridgeMessage, to: string): Promise<void>;
    subscribe(agentId: string, handler: (msg: BridgeMessage) => void): () => void;
    close(agentId: string): Promise<void>;
}
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