export declare type TJsonRpcResponse<T> = {
    code: number;
    message: string;
    content: T;
    details?: string;
};
export declare class JsonRpc {
    endpoint: string;
    fetchBuiltin: (input?: Request | string, init?: RequestInit) => Promise<Response>;
    constructor(endpoint: string, args?: {
        fetch?: (input?: string | Request, init?: RequestInit) => Promise<Response>;
    });
    fetch(path: string, body: any): Promise<any>;
}