import { Buffer } from 'node:buffer';
import https from 'node:https';
import tls from 'node:tls';
/**
 * Creates a transport instance based on the specified type.
 * Factory function to get the appropriate transport implementation.
 *
 * @param type - The type of transport to create
 * @returns A transport instance implementing the Transport interface
 * @throws {Error} If the transport type is not supported
 *
 * @example
 * ```ts
 * const transport = createTransport(TransportType.UDP)
 * const response = await transport.query('1.1.1.1', dnsPacket)
 * ```
 */
export declare function createTransport(type: TransportType): Transport;
/**
 * Interface for DNS transport implementations.
 * All transport types must implement this interface.
 */
export declare interface Transport {
  query: (nameserver: string, request: Buffer) => Promise<Buffer>
}
/**
 * UDP transport implementation for DNS queries.
 * Uses UDP datagrams for maximum performance with retransmission support.
 *
 * Features:
 * - Automatic port selection (default: 53)
 * - Configurable timeout
 * - Error handling for network issues
 */
declare class UDPTransport implements Transport {
  query(nameserver: string, request: Buffer): Promise<Buffer>;
}
/**
 * TCP transport implementation for DNS queries.
 * Used for larger DNS messages and when reliability is crucial.
 *
 * Features:
 * - Length-prefixed messages (RFC 1035)
 * - Automatic message reassembly
 * - Connection timeout handling
 */
declare class TCPTransport implements Transport {
  query(nameserver: string, request: Buffer): Promise<Buffer>;
}
/**
 * TLS transport implementation for DNS queries (DNS-over-TLS).
 * Provides encrypted DNS communication for enhanced privacy.
 *
 * Features:
 * - TLS 1.2+ encryption
 * - SNI support
 * - Certificate validation
 * - Length-prefixed messages
 */
declare class TLSTransport implements Transport {
  query(nameserver: string, request: Buffer): Promise<Buffer>;
}
/**
 * HTTPS transport implementation for DNS queries (DNS-over-HTTPS).
 * Provides encrypted DNS communication over HTTPS for maximum compatibility.
 *
 * Features:
 * - HTTPS POST requests
 * - Binary DNS wire format
 * - Standard HTTPS port (443)
 * - Compatible with HTTP proxies
 */
declare class HTTPSTransport implements Transport {
  query(nameserver: string, request: Buffer): Promise<Buffer>;
}
/**
 * Available DNS transport protocols.
 * Each transport type represents a different way to send DNS queries.
 */
export declare enum TransportType {
  UDP = 'udp', // Traditional UDP DNS (port 53)
  TCP = 'tcp', // TCP DNS (port 53)
  TLS = 'tls', // DNS-over-TLS (port 853)
  HTTPS = 'https', // DNS-over-HTTPS
}