dns: make promise API fully constructed from lib/internal/dns/promises

PR-URL: #43227
Refs: #43198
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>

Author: F3n67u

lib/dns.js

@@ -415,8 +415,6 @@ ObjectDefineProperties(module.exports, {
     get() {
       if (promises === null) {
         promises = require('internal/dns/promises');
-        promises.setServers = defaultResolverSetServers;
-        promises.setDefaultResultOrder = setDefaultResultOrder;
       }
       return promises;
     }

lib/dns/promises.js

@@ -1,5 +1,3 @@
 'use strict';
 
-const dnsPromises = require('internal/dns/promises');
-dnsPromises.setServers = require('dns').setServers;
-module.exports = dnsPromises;
+module.exports = require('internal/dns/promises');

lib/internal/dns/promises.js

@@ -17,6 +17,8 @@ const {
   emitInvalidHostnameWarning,
   getDefaultVerbatim,
   errorCodes: dnsErrorCodes,
+  setDefaultResultOrder,
+  setDefaultResolver,
 } = require('internal/dns/utils');
 const {
   NODATA,
@@ -335,11 +337,20 @@ Resolver.prototype.resolve = function resolve(hostname, rrtype) {
   return ReflectApply(resolver, this, [hostname]);
 };
 
+function defaultResolverSetServers(servers) {
+  const resolver = new Resolver();
+
+  resolver.setServers(servers);
+  setDefaultResolver(resolver);
+  bindDefaultResolver(module.exports, Resolver.prototype);
+}
 
 module.exports = {
   lookup,
   lookupService,
   Resolver,
+  setDefaultResultOrder,
+  setServers: defaultResolverSetServers,
 
   // ERROR CODES
   NODATA,