import type { ConnectRequest, ConnectResponse, DisconnectResponse, DiscoverResponse, SignalingMessage } from "./signaling-types.js";
export type SignalingMessageHandler = (msg: SignalingMessage) => void;
/**
 * Client for the WebRTC signaling server.
 *
 * Encapsulates REST API calls (discover, connect, disconnect) and
 * WebSocket lifecycle (connect, send, message routing, heartbeat).
 */
export declare class SignalingClient {
    private ws;
    private apiUrl;
    private signalingUrl;
    private messageHandler;
    private heartbeatInterval;
    constructor(apiUrl: string, signalingUrl: string);
    discoverRobots(): Promise<DiscoverResponse>;
    requestConnection(robotId: string, request: ConnectRequest): Promise<ConnectResponse>;
    requestDisconnect(robotId: string): Promise<DisconnectResponse>;
    /** Connect to the signaling WebSocket server. */
    connectWs(): Promise<void>;
    /** Set the handler for incoming signaling messages. */
    onMessage(handler: SignalingMessageHandler): void;
    /** Send a signaling message over WebSocket. */
    send(message: SignalingMessage): void;
    /** Send join_room to enter the session room. */
    joinRoom(roomId: string, peerId: string, peerType: "frontend" | "robot", sessionId: string): void;
    /** Send an SDP answer back to the peer. */
    sendAnswer(sdp: string, roomId: string, peerId: string, targetPeerId?: string): void;
    /** Send an ICE candidate to the peer. */
    sendIceCandidate(candidate: string, sdpMid: string | null, sdpMLineIndex: number | null, targetPeerId?: string): void;
    /** Close the signaling WebSocket. */
    close(): void;
    /** Whether the WebSocket is currently connected. */
    get isConnected(): boolean;
    private startHeartbeat;
    private stopHeartbeat;
}
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