/**
 * Embedded SSE Transport
 *
 * Wraps SSE (EventSource) connections as TransportClients so they
 * participate in the gateway's unified transport system. SSE clients
 * get ClientEventBuffer backpressure, appear in gateway.status.clients,
 * and receive DevTools lifecycle events — just like WS or local clients.
 *
 * Used only in embedded mode (handleRequest path).
 */
import type { ServerResponse as NodeResponse } from "http";
import { BaseTransport, type TransportClient } from "./transport.js";
import type { GatewayMessage } from "./transport-protocol.js";
import type { ClientState } from "./types.js";
export declare class EmbeddedSSEClient implements TransportClient {
    private res;
    readonly id: string;
    readonly state: ClientState;
    private heartbeatInterval;
    constructor(id: string, res: NodeResponse);
    send(message: GatewayMessage): void;
    isPressured(): boolean;
    onDrain(callback: () => void): void;
    get isConnected(): boolean;
    close(): void;
    startHeartbeat(intervalMs?: number): void;
    stopHeartbeat(): void;
    onClose(handler: () => void): void;
}
export declare class EmbeddedSSETransport extends BaseTransport {
    readonly type: "sse";
    start(): Promise<void>;
    stop(): Promise<void>;
    registerClient(clientId: string, res: NodeResponse): EmbeddedSSEClient;
}
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