better geoip-lite lookup type (#43575)

types/geoip-lite/index.d.ts

@@ -3,14 +3,34 @@
 // Definitions by: Yuce Tekol <http://yuce.me/>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-
 declare namespace mod {
+    /**
+     * https://github.com/bluesmoon/node-geoip#looking-up-an-ip-address
+     */
     export interface Lookup {
-        range: Array<number>; // range start, end
+        /** [ <low bound of IP block>, <high bound of IP block> ] */
+        range: [number, number];
+        /** 2 letter ISO-3166-1 country code https://www.iban.com/country-codes */
         country: string;
+        /**
+         * Up to 3 alphanumeric variable length characters as ISO 3166-2 code
+         * For US states this is the 2 letter state
+         * For the United Kingdom this could be ENG as a country like “England
+         * FIPS 10-4 subcountry code
+         */
         region: string;
+        /** 1 if the country is a member state of the European Union, 0 otherwise. */
+        eu: '1' | '0';
+        /** "Country/Zone" Timezone from IANA Time Zone Database */
+        timezone: string;
+        /** This is the full city name */
         city: string;
-        ll: Array<number>; // latitude, longitude
+        /** The latitude and longitude of the city */
+        ll: [number, number];
+        /** Metro code */
+        metro: number;
+        /** The approximate accuracy radius (km), around the latitude and longitude */
+        area: number;
     }
 
     export function lookup(ip: string): null | Lookup;