/**
 * Transport Factory
 *
 * Creates MCP transports (Stdio, SSE, or Streamable HTTP) based on configuration.
 * Handles authentication, PATH setup, and runtime detection.
 *
 * Transport Types:
 * - Stdio: Local process communication (command-based)
 * - SSE: Legacy HTTP+SSE transport (deprecated but widely supported)
 * - Streamable HTTP: Modern HTTP transport with streaming (MCP 2025-03-26+)
 */
import { MCPOAuthProvider } from '../../auth/mcp-oauth-provider.js';
import type { MCPConfig, MCPTransport } from '../types/connection.js';
import type { TransportFactory } from './connection-pool.js';
/**
 * Auth token provider function type
 */
export type AuthTokenProvider = (config: MCPConfig) => Promise<string>;
/**
 * Default Transport Factory implementation
 *
 * Creates appropriate transports based on MCP configuration.
 */
export declare class DefaultTransportFactory implements TransportFactory {
    private authTokenProvider?;
    private oauthProviders;
    constructor(authTokenProvider?: AuthTokenProvider);
    /**
     * Get or create an OAuth provider for a server
     * Reuses existing providers to preserve token state
     */
    getOAuthProvider(config: MCPConfig): MCPOAuthProvider;
    /**
     * Set the auth token provider
     */
    setAuthTokenProvider(provider: AuthTokenProvider): void;
    /**
     * Create a transport based on config
     */
    createTransport(config: MCPConfig, env?: Record<string, string>): Promise<MCPTransport>;
    /**
     * Create SSE transport for HTTP-based MCPs (legacy)
     */
    private createSSETransport;
    /**
     * Create Streamable HTTP transport for modern MCP servers
     *
     * Features:
     * - Single endpoint for bidirectional messaging
     * - Automatic SSE upgrade for streaming responses
     * - Session management with Mcp-Session-Id header
     * - Reconnection with exponential backoff
     * - OAuth 2.1 with PKCE (MCP 2025-03-26 spec)
     */
    private createStreamableHTTPTransport;
    /**
     * Create Stdio transport for local process MCPs
     */
    private createStdioTransport;
    /**
     * Setup environment variables with proper PATH
     */
    private setupEnvironment;
    /**
     * Get authentication token for config
     */
    getAuthToken(config: MCPConfig): Promise<string>;
}
/**
 * Create a default transport factory instance
 */
export declare function createTransportFactory(authTokenProvider?: AuthTokenProvider): DefaultTransportFactory;
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