import { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
import { JSONRPCMessage } from '@modelcontextprotocol/sdk/types.js';
import { Context } from 'hono';
import { SSEStreamingApi } from 'hono/streaming';

/**
 * Hono transport for SSE: this will send messages over an SSE connection and receive messages from HTTP POST requests.
 *
 * This can work in all the environments that support SSE with Hono.
 */
declare class SSEHonoTransport implements Transport {
    private _endpoint;
    private stream;
    private _stream?;
    private _sessionId;
    onclose?: () => void;
    onerror?: (error: Error) => void;
    onmessage?: (message: JSONRPCMessage) => void;
    /**
     * Creates a new SSE server transport, which will direct the client to POST messages to the relative or absolute URL identified by `_endpoint`.
     */
    constructor(_endpoint: string, sessionId?: string);
    connectWithStream(stream: SSEStreamingApi): void;
    /**
     * Handles the initial SSE connection request.
     *
     * This should be called when a GET request is made to establish the SSE stream.
     */
    start(): Promise<void>;
    /**
     * Handles incoming POST messages.
     *
     * This should be called when a POST request is made to send a message to the server.
     */
    handlePostMessage(c: Context, parsedBody?: unknown): Promise<void>;
    /**
     * Handle a client message, regardless of how it arrived. This can be used to inform the server of messages that arrive via a means different than HTTP POST.
     */
    handleMessage(message: unknown): Promise<void>;
    close(): Promise<void>;
    send(message: JSONRPCMessage): Promise<void>;
    /**
     * Returns the session ID for this transport.
     *
     * This can be used to route incoming POST requests.
     */
    get sessionId(): string;
}
declare const streamSSE: (c: Context, cb: (stream: SSEStreamingApi) => Promise<void>, onError?: (e: Error, stream: SSEStreamingApi) => Promise<void>) => Response;

export { SSEHonoTransport, streamSSE };