export declare namespace XHR {
    class Header {
        header: string;
        data: string;
        constructor(header: string, data: string);
    }
    class Data {
        statusCode: number;
        contentType: string;
        body: JSON | Array<JSON> | any;
        constructor(status: number, contentType: string, body: JSON | Array<JSON> | any);
    }
    class XHRError extends Error {
        statusCode: number;
        errorCode: string;
        headers: Headers;
        message: string;
        constructor(message: string, status: number, errorCode: string, headers: Headers);
    }
    function sendCommand(method: string, url: string, headers: Array<Header> | null, data?: string | any, fetchImpl?: (input: RequestInfo, init?: RequestInit) => Promise<Response>, contentTypeOverride?: "application/json" | "text/plain" | "application/octet-stream"): Promise<Data>;
}