/**
 * @description A simple HTTP client for downloading files.
 * @summary This class provides functionality to download files from HTTPS URLs.
 * It uses Node.js built-in https module to make requests.
 *
 * @class
 */
export declare class HttpClient {
    protected static log: import("@decaf-ts/logging").Logger;
    /**
     * @description Downloads a file from a given URL.
     * @summary This method sends a GET request to the specified URL and returns the response body as a string.
     * It handles different scenarios such as non-200 status codes and network errors.
     *
     * @param url - The URL of the file to download.
     * @return A promise that resolves with the file content as a string.
     *
     * @mermaid
     * sequenceDiagram
     *   participant Client
     *   participant HttpClient
     *   participant HTTPS
     *   participant Server
     *   Client->>HttpClient: downloadFile(url)
     *   HttpClient->>HTTPS: get(url)
     *   HTTPS->>Server: GET request
     *   Server-->>HTTPS: Response
     *   HTTPS-->>HttpClient: Response object
     *   alt Status code is 200
     *     loop For each data chunk
     *       HTTPS->>HttpClient: 'data' event
     *       HttpClient->>HttpClient: Accumulate data
     *     end
     *     HTTPS->>HttpClient: 'end' event
     *     HttpClient-->>Client: Resolve with data
     *   else Status code is not 200
     *     HttpClient-->>Client: Reject with error
     *   end
     */
    static downloadFile(url: string): Promise<string>;
}