export declare class ValidationError extends Error {
    constructor(message: string);
}
/**
 * Validate a port number is within safe range and is a valid integer.
 */
export declare function validatePort(port: unknown): number;
/**
 * Validate a libp2p multiaddress format.
 * Must contain /ip4/ or /ip6/ and /p2p/ components.
 */
export declare function validateMultiaddr(addr: string): string;
/**
 * Validate an IPv4 address.
 */
export declare function validateIPv4(ip: string): string;
/**
 * Validate a file path doesn't contain dangerous characters.
 * Prevents path traversal and command injection via paths.
 *
 * Note: Backslashes are allowed for Windows path compatibility.
 * Since we use execFileSync (no shell), backslashes are safe.
 */
export declare function validatePath(filePath: string): string;
/**
 * Validate a CID (Content Identifier) format.
 * Supports both CIDv0 (Qm...) and CIDv1 (bafy...) formats.
 */
export declare function validateCID(cid: string): string;
/**
 * Sanitize a string for display (strip control characters).
 */
export declare function sanitize(input: string): string;
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