import { Transport } from './transport.js';
import { MCPMessage } from './types.js';
/**
 * HTTP transport implementation for MCP communication (client-side only).
 * Connects OUT to remote HTTP MCP servers (e.g. Python mcp-server-motherduck).
 *
 * Note: This is distinct from the SDK's StreamableHTTPServerTransport which is
 * server-side (accepts incoming connections). An HTTP server mode for
 * DuckDBMCPServer is future work — not needed for S3 scope.
 */
export declare class HTTPTransport extends Transport {
    private url;
    private client;
    private connected;
    private messageQueue;
    private waitingResolvers;
    private sessionId?;
    private pollInterval?;
    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 polling for server-sent messages
     */
    private startPolling;
    /**
     * Wait for the next message
     */
    private waitForMessage;
    /**
     * Resolve waiting iterators when new messages arrive or connection closes
     */
    private resolveWaitingIterators;
    /**
     * Execute a request-response pattern (convenience method)
     */
    request(method: string, params?: unknown): Promise<unknown>;
}
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