//#region src/mcp-client.d.ts
export type McpEra = {
  kind: "modern";
  version: string;
} | {
  kind: "legacy";
  version: string;
};
export declare class McpError extends Error {
  readonly code: number;
  readonly data?: unknown;
  readonly status?: number;
  readonly broken?: "ended" | "reset";
  constructor(message: string, code: number, opts?: {
    data?: unknown;
    status?: number;
    broken?: "ended" | "reset";
  });
}
export type McpClientOptions = {
  url: string;
  headers: () => Promise<Record<string, string>> | Record<string, string>;
  clientInfo?: {
    name: string;
    version: string;
  };
  fetch?: typeof fetch;
};
export declare class McpClient {
  private readonly opts;
  private readonly clientInfo;
  private era;
  private connecting;
  private readonly sessions;
  private nextId;
  constructor(opts: McpClientOptions);
  get negotiated(): McpEra | undefined;
  connect(): Promise<McpEra>;
  request(method: string, params?: Record<string, unknown>, opts?: {
    headers?: () => Promise<Record<string, string>> | Record<string, string>;
    extraHeaders?: Record<string, string>;
  }): Promise<Record<string, unknown>>;
  private probe;
  private handshake;
  private remember;
  private legacyHeaders;
  private legacyRequest;
  private answer;
  private modernBody;
  private modernHeaders;
  private modernOnce;
  private modernRequest;
  private id;
  private post;
  private readMessage;
  private result;
}
//#endregion