import { FileData, UploadResult, DeleteResult, FileList, FileMetadata, UploadOptions, DownloadOptions, ListOptions, FileHandlerConfig, BackendInfo, ValidationRules, ValidationResult, ImageProcessOptions, ScanResult, FileOperationResult } from './types';
/**
 * Core file handling class providing unified file operations across multiple storage backends
 */
export declare class FileHandler {
    private backend;
    private config;
    private backendSelector;
    private initialized;
    constructor(config?: FileHandlerConfig);
    /**
     * Initialize the file handler with backend
     */
    initialize(): Promise<FileOperationResult<void>>;
    /**
     * Upload a file with optional processing
     */
    uploadFile(file: FileData, options?: UploadOptions): Promise<FileOperationResult<UploadResult>>;
    /**
     * Download a file
     */
    downloadFile(fileId: string, options?: DownloadOptions): Promise<FileOperationResult<FileData>>;
    /**
     * Delete a file
     */
    deleteFile(fileId: string): Promise<FileOperationResult<DeleteResult>>;
    /**
     * List files
     */
    listFiles(options?: ListOptions): Promise<FileOperationResult<FileList>>;
    /**
     * Get file metadata
     */
    getFileMetadata(fileId: string): Promise<FileOperationResult<FileMetadata>>;
    /**
     * Get file URL
     */
    getFileUrl(fileId: string, expiresIn?: number | undefined): Promise<FileOperationResult<string>>;
    /**
     * Process an image
     */
    processImage(buffer: Buffer, options: ImageProcessOptions): Promise<FileOperationResult<Buffer>>;
    /**
     * Validate a file
     */
    validateFile(file: FileData, rules?: ValidationRules | undefined): Promise<ValidationResult>;
    /**
     * Scan file for viruses (placeholder - would integrate with actual virus scanner)
     */
    scanForVirus(buffer: Buffer): Promise<ScanResult>;
    /**
     * Get backend information
     */
    getBackendInfo(): BackendInfo | undefined;
    /**
     * Test backend connection
     */
    testConnection(): Promise<boolean>;
    /**
     * Check if file is an image
     */
    private isImage;
    /**
     * Get configuration
     */
    getConfig(): FileHandlerConfig;
    /**
     * Update configuration
     */
    updateConfig(newConfig: Partial<FileHandlerConfig>): void;
    /**
     * Check if handler is initialized
     */
    isInitialized(): boolean;
}
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