import { type JsonRpcMessage } from "../protocol/jsonrpc.js";
export declare const DEFAULT_MAX_MESSAGE_BYTES: number;
export type McpTransportMessageListener = (message: JsonRpcMessage) => void;
export type McpTransportErrorListener = (error: Error) => void;
export type McpTransportCloseListener = () => void;
export interface McpTransportSendOptions {
    signal?: AbortSignal;
}
export interface McpTransport {
    start(): Promise<void>;
    send(message: JsonRpcMessage, options?: McpTransportSendOptions): Promise<void>;
    close(): Promise<void>;
    onMessage(listener: McpTransportMessageListener): () => void;
    onError(listener: McpTransportErrorListener): () => void;
    onClose(listener: McpTransportCloseListener): () => void;
    setProtocolVersion?(version: string): void;
}
/** Listener bookkeeping shared by transports. `emitClose` fires at most once per transport. */
export declare abstract class TransportEvents {
    private messageListeners;
    private errorListeners;
    private closeListeners;
    private closeEmitted;
    onMessage(listener: McpTransportMessageListener): () => void;
    onError(listener: McpTransportErrorListener): () => void;
    onClose(listener: McpTransportCloseListener): () => void;
    protected emitMessage(message: JsonRpcMessage): void;
    protected emitError(error: unknown): void;
    protected emitClose(): void;
}
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