feat: Add TypeScript typings (#66)

package.json

@@ -3,6 +3,7 @@
   "version": "2.2.1",
   "description": "Splits an url into sub-domain, domain and effective top-level-domain",
   "main": "./lib/parseDomain.js",
+  "types": "./lib/index.d.ts",
   "scripts": {
     "build": "run-s build:lib build:tries",
     "build:lib": "run-s build:lib:clean build:lib:babel",

src/index.d.ts

@@ -0,0 +1,18 @@
+export as namespace parseDomain;
+
+declare namespace parseDomain {
+  interface IParseOptions {
+    customTlds?: RegExp | string[];
+    privateTlds?: boolean;
+  }
+
+  interface IParsedDomain {
+    domain?: string;
+    subdomain?: string;
+    tld?: string;
+  }
+}
+
+declare function parseDomain (url: string, options?: parseDomain.IParseOptions): parseDomain.IParsedDomain;
+
+export = parseDomain;