export declare class FileHelper {
    static downloadBase64(fileName: string, base64: string): void;
    private static dataURIToBlob;
    static getMimeType(fileName: string): "text/plain" | "application/pdf" | "application/json" | "image/jpeg" | "image/png" | "image/gif" | "application/zip";
    static parseBucketUrl(bucketUrl: string): {
        fileName: string;
        fileSize: number;
        uploadedAtUnix: number;
    };
}