Update Download / Global Hosts

Build/lib/normalize-domain.ts

@@ -0,0 +1,15 @@
+import * as tldts from './cached-tld-parse';
+import { isProbablyIpv4 } from './is-fast-ip';
+export const normalizeDomain = (domain: string) => {
+  if (!domain) return null;
+  if (isProbablyIpv4(domain)) return null;
+
+  const parsed = tldts.parse2(domain);
+  if (parsed.isIp) return null;
+  if (!parsed.isIcann && !parsed.isPrivate) return null;
+
+  const h = parsed.hostname;
+  if (!h) return null;
+
+  return h[0] === '.' ? h.slice(1) : h;
+};