/**
 * Check if a path is safe (no traversal attempts).
 * Detects:
 * - Directory traversal (../)
 * - Null bytes (\0)
 *
 * @param userPath - Path to validate
 * @returns true if path is safe
 */
export declare function isPathSafe(userPath: string): boolean;
/**
 * Validate an output path for file operations.
 * Throws if the path is invalid or contains traversal attempts.
 *
 * @param filePath - Path to validate
 * @throws Error if path is invalid
 */
export declare function validateOutputPath(filePath: string): void;
/**
 * Safely join paths with traversal protection.
 * The resulting path is validated to not escape the base directory.
 *
 * @param basePath - Base directory (must be absolute)
 * @param userPath - User-provided path component
 * @returns Joined and validated path
 * @throws Error if the result would escape basePath
 */
export declare function safeJoinPath(basePath: string, userPath: string): string;
/**
 * Validate that a path doesn't contain any dangerous characters.
 * This is an additional layer of protection for paths that will be used
 * in contexts where special characters could cause issues.
 *
 * @param filePath - Path to validate
 * @returns true if path contains only safe characters
 */
export declare function hasSafeCharacters(filePath: string): boolean;
/**
 * Sanitize a filename by removing or replacing dangerous characters.
 * Use this for user-provided filenames that need to be safe.
 *
 * @param filename - Filename to sanitize
 * @returns Sanitized filename
 */
export declare function sanitizeFilename(filename: string): string;
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