/**
 * Convert byts to diffirents sizes types.
 * @param {number} bytes
 */
export declare function bytesToSize(bytes: any): string;
/**
 * Get extension file.
 * @param {file} file.
 */
export declare function getFileExtension(file: File): string;
/**
 * Validate by types.
 * @param {file} file .file object.
 * @param {array} allowedFileTypes list allowed types file.
 */
export declare function extensions(file: File, allowedFileTypes: string[]): boolean;
/**
 * Validate by size.
 * @param {file} file .file object.
 * @param {number} maxFileSize max size file.
 */
export declare function maxSize(file: File, maxFileSize: any): boolean;