import { FileData, ValidationRules, ValidationResult } from '../types';
export declare class FileValidator {
    private static readonly DEFAULT_MAX_SIZE;
    private static readonly DEFAULT_ALLOWED_TYPES;
    /**
     * Validate a file according to specified rules
     */
    static validateFile(file: FileData, rules?: ValidationRules): Promise<ValidationResult>;
    /**
     * Check if file type is allowed
     */
    private static isAllowedType;
    /**
     * Check if file is an image
     */
    private static isImage;
    /**
     * Get file extension from filename
     */
    private static getFileExtension;
    /**
     * Check if file is executable
     */
    private static isExecutableFile;
    /**
     * Check for suspicious patterns in filename
     */
    private static hasSuspiciousPattern;
    /**
     * Format bytes to human readable string
     */
    private static formatBytes;
    /**
     * Get MIME type from file extension
     */
    static getMimeType(filename: string): string;
    /**
     * Validate file size string (e.g., "10MB", "1GB")
     */
    static parseSizeString(sizeString: string): number;
}
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