import { type SoloLogger } from './logging.js';
export declare class PackageDownloader {
    readonly logger?: SoloLogger;
    constructor(logger?: SoloLogger);
    isValidURL(url: string): boolean;
    urlExists(url: string): Promise<boolean>;
    /**
     * Fetch data from a URL and save the output to a file
     *
     * @param url - source file URL
     * @param destPath - destination path for the downloaded file
     */
    fetchFile(url: string, destPath: string): Promise<string>;
    /**
     * Compute hash of the file contents
     * @param filePath - path of the file
     * @param [algo] - hash algorithm
     * @returns hex digest of the computed hash
     * @throws {Error} - if the file cannot be read
     */
    computeFileHash(this: any, filePath: string, algo?: string): Promise<string>;
    /**
     * Verifies that the checksum of the sourceFile matches with the contents of the checksumFile
     *
     * It throws error if the checksum doesn't match.
     *
     * @param sourceFile - path to the file for which checksum to be computed
     * @param checksum - expected checksum
     * @param [algo] - hash algorithm to be used to compute checksum
     * @returns
     * @throws {DataValidationError} - if the checksum doesn't match
     */
    verifyChecksum(sourceFile: string, checksum: string, algo?: string): Promise<void>;
    /**
     * Fetch a remote package
     * @param packageURL
     * @param checksumURL - package checksum URL
     * @param destDir - a directory where the files should be downloaded to
     * @param [algo] - checksum algo
     * @param [force] - force download even if the file exists in the destDir
     */
    fetchPackage(packageURL: string, checksumURL: string, destDir: string, algo?: string, force?: boolean): Promise<string>;
    /**
     * Fetch Hedera platform release artifact
     *
     * It fetches the build.zip file containing the release from a URL like: https://builds.hedera.com/node/software/v0.40/build-v0.40.4.zip
     *
     * @param tag - full semantic version e.g. v0.40.4
     * @param destDir - directory where the artifact needs to be saved
     * @param [force] - whether to download even if the file exists
     * @returns full path to the downloaded file
     */
    fetchPlatform(tag: string, destDir: string, force?: boolean): Promise<string>;
}