import { Transport } from './transport.js';
import { MCPMessage } from './types.js';
/**
 * WebSocket transport implementation for real-time MCP communication
 * Compatible with Python mcp-server-motherduck WebSocket mode
 */
export declare class WebSocketTransport extends Transport {
    private url;
    private ws?;
    private connected;
    private messageQueue;
    private waitingResolvers;
    private reconnectAttempts;
    private maxReconnectAttempts;
    private reconnectDelay;
    private pingInterval?;
    private headers;
    constructor(url: string, headers?: Record<string, string>);
    connect(): Promise<void>;
    disconnect(): Promise<void>;
    send(message: MCPMessage): Promise<void>;
    receive(): AsyncIterator<MCPMessage>;
    isConnected(): boolean;
    /**
     * Start sending periodic ping messages to keep connection alive
     */
    private startPingInterval;
    /**
     * Stop the ping interval
     */
    private stopPingInterval;
    /**
     * Attempt to reconnect with exponential backoff
     */
    private attemptReconnect;
    /**
     * Wait for the next message
     */
    private waitForMessage;
    /**
     * Resolve waiting iterators when new messages arrive or connection closes
     */
    private resolveWaitingIterators;
    /**
     * Get WebSocket ready state (for debugging)
     */
    getReadyState(): string;
}
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