import { type JSONRPCMessage } from '@modelcontextprotocol/sdk/types.js';
import { Request, Response } from 'express';
/**
 * Server transport for SSE using Express Response type.
 * Adapts the SSEServerTransport functionality to work with Express.
 */
export declare class ExpressSSEServerTransport {
    private _endpoint;
    private _sessionId;
    private _sseResponse?;
    onmessage?: (message: JSONRPCMessage) => void;
    onclose?: () => void;
    onerror?: (error: Error) => void;
    /**
     * Creates a new SSE server transport for Express.
     * @param _endpoint The endpoint where clients should POST messages
     */
    constructor(_endpoint: string);
    /**
     * Sets up the SSE connection using Express Response.
     * This method should be called to handle the initial SSE request.
     */
    handleSSERequest(res: Response): void;
    /**
     * Start the SSE connection - required by McpServer
     */
    start(): Promise<void>;
    /**
     * Handles incoming POST messages.
     */
    handlePostMessage(req: Request, res: Response): Promise<void>;
    /**
     * Handle a client message, regardless of how it arrived.
     */
    handleMessage(message: JSONRPCMessage): Promise<void>;
    /**
     * Close the SSE connection.
     */
    close(): Promise<void>;
    /**
     * Send a message over the SSE connection.
     */
    send(message: JSONRPCMessage): Promise<void>;
    /**
     * Returns the session ID for this transport.
     */
    get sessionId(): string;
}
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