import { FileStorageBackend, FileData, UploadResult, DeleteResult, FileList, FileMetadata, UploadOptions, DownloadOptions, ListOptions, BackendInfo } from '../types';
export declare class S3StorageBackend implements FileStorageBackend {
    private client;
    private bucketName;
    private region;
    private isConnected;
    constructor();
    private generateFilePath;
    upload(file: FileData, options?: UploadOptions): Promise<UploadResult>;
    download(fileId: string, _options?: DownloadOptions): Promise<FileData>;
    delete(fileId: string): Promise<DeleteResult>;
    list(options?: ListOptions): Promise<FileList>;
    getMetadata(fileId: string): Promise<FileMetadata>;
    getUrl(fileId: string, _expiresIn?: number): Promise<string>;
    testConnection(): Promise<boolean>;
    getBackendInfo(): BackendInfo;
    private ensureConnection;
}
//# sourceMappingURL=s3-storage.d.ts.map