/**
 * Miyabi MCP Bundle - Security Utilities
 *
 * Functions for input sanitization and security validation.
 */
/**
 * Sanitize shell argument to prevent command injection
 * Removes dangerous characters that could be used for injection attacks
 */
export declare function sanitizeShellArg(arg: string): string;
/**
 * Validate and sanitize path to prevent traversal and symlink attacks
 * @throws Error if path traversal or symlink attack detected
 */
export declare function sanitizePath(basePath: string, userPath: string): string;
/**
 * Validate input string length
 * @returns Error message if validation fails, null if valid
 */
export declare function validateInputLength(value: string, maxLength: number, fieldName: string): string | null;
/**
 * Validate query string (length check)
 */
export declare function validateQuery(query: string): string | null;
/**
 * Validate path string (length check)
 */
export declare function validatePath(path: string): string | null;
/**
 * Validate hostname string (length check)
 */
export declare function validateHostnameLength(hostname: string): string | null;
/**
 * Validate hostname format (DNS-compatible)
 * Allows: alphanumeric, hyphens, dots, IPv4 addresses
 */
export declare function isValidHostname(hostname: string): boolean;
/**
 * Validate process ID (PID)
 */
export declare function isValidPid(pid: unknown): boolean;
/**
 * Check if a command exists on the system
 * Uses 'which' on Unix-like systems, 'where' on Windows
 */
export declare function commandExists(cmd: string, execAsync: (cmd: string) => Promise<{
    stdout: string;
}>): Promise<boolean>;
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