/**
 * Extract files from a file input change event
 *
 * @param event - The file input change event
 *
 * @returns The files from the event
 */
export declare function getFilesFromEvent(event: React.ChangeEvent<HTMLInputElement>): File[];
/**
 * Format file size in human-readable format
 *
 * @param bytes - The size in bytes
 *
 * @returns The formatted file size
 */
export declare function formatFileSize(bytes: number): string;
/**
 * Get file extension from filename
 *
 * @param filename - The name of the file
 *
 * @returns The file extension including the dot
 */
export declare function getFileExtension(filename: string): string;
/**
 * Check if file matches a MIME type pattern
 *
 * @param file - The file to check
 *
 * @param pattern - The MIME type pattern
 *
 * @returns True if the file matches the pattern
 */
export declare function matchesMimeType(file: File, pattern: string): boolean;
/**
 * Check if file has specific extension
 *
 * @param file - The file to check
 *
 * @param extension - The extension to check
 *
 * @returns True if the file has the extension
 */
export declare function hasExtension(file: File, extension: string): boolean;
/**
 * Get total size of multiple files
 *
 * @param files - The files to get the total size of
 *
 * @returns The total size of the files
 */
export declare function getTotalFileSize(files: File[]): number;
/**
 * Simple validation result type
 *
 * @property isValid - Whether the file is valid
 *
 * @property error - The error message
 */
export type FileValidationResult = {
    isValid: boolean;
    error?: string;
};
/**
 * Helper to create validation results
 *
 * @param isValid - Whether the file is valid
 *
 * @param error - The error message
 *
 * @returns The validation result
 */
export declare function createValidationResult(isValid: boolean, error?: string): FileValidationResult;
/**
 * Common file type groups
 *
 * @property IMAGES - The image file types
 *
 * @property DOCUMENTS - The document file types
 *
 * @property ARCHIVES - The archive file types
 */
export declare const FILE_TYPES: {
    readonly IMAGES: readonly ["image/jpeg", "image/png", "image/gif", "image/webp", "image/svg+xml"];
    readonly DOCUMENTS: readonly ["application/pdf", "application/msword", "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "application/vnd.ms-excel", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "text/plain"];
    readonly ARCHIVES: readonly ["application/zip", "application/x-rar-compressed", "application/x-tar"];
};