domains.ts

function extractDomainFromURL(url: string, onlyDomain?: boolean): string | undefined {
  const hostname = new URL(url).hostname

  const parts = hostname.split('.').slice(-3)

  const tld = parts.at(1)

  if(tld && tld === "com") return onlyDomain ? parts.shift() : parts.join('.')

  if(tld && tld.length > 2) {
    const parsed = parts.slice(-2)

    return onlyDomain ? parsed.shift() : parsed.join('.')
  }

  return onlyDomain ? parts.shift() : parts.join('.')
}