Second Level Domains

/**
 * Check if domain has a known second-level domain
 * @param domain - Domain to check
 * @returns Boolean indicating SLD presence
 */
SecondLevelDomains.has(domain: string): boolean;

/**
 * Check if domain is a known second-level domain
 * @param domain - Domain to check
 * @returns Boolean indicating if domain is an SLD
 */
SecondLevelDomains.is(domain: string): boolean;

/**
 * Get second-level domain portion of domain
 * @param domain - Domain to extract SLD from
 * @returns SLD portion or null if none
 */
SecondLevelDomains.get(domain: string): string | null;

/**
 * Object containing SLD mappings by top-level domain
 */
SecondLevelDomains.list: object;

/**
 * Restore previous SecondLevelDomains variable
 * @returns Previous SecondLevelDomains variable value
 */
SecondLevelDomains.noConflict(): any;

// Import SecondLevelDomains module
import SecondLevelDomains from 'urijs/src/SecondLevelDomains';

// Check for second-level domains
console.log(SecondLevelDomains.has('bbc.co.uk')); // true
console.log(SecondLevelDomains.has('example.com')); // false

// Check if domain is an SLD
console.log(SecondLevelDomains.is('co.uk')); // true
console.log(SecondLevelDomains.is('com')); // false

// Extract SLD portion
console.log(SecondLevelDomains.get('bbc.co.uk')); // 'co.uk'
console.log(SecondLevelDomains.get('example.com')); // null

// Various country examples
console.log(SecondLevelDomains.get('site.com.au')); // 'com.au'
console.log(SecondLevelDomains.get('blog.gov.uk')); // 'gov.uk'
console.log(SecondLevelDomains.get('shop.co.jp')); // 'co.jp'

// Use with URI.js for domain parsing
const uri = new URI('http://www.bbc.co.uk/news');
console.log(uri.hostname()); // 'www.bbc.co.uk'
console.log(uri.domain()); // 'bbc' (excludes SLD)
console.log(uri.tld()); // 'co.uk' (includes SLD)
console.log(uri.is('sld')); // true

// Access SLD list directly
console.log(SecondLevelDomains.list.uk); // ['co', 'gov', 'ac', ...]
console.log(SecondLevelDomains.list.au); // ['com', 'gov', 'edu', ...]