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

Author: F3n67u

lib/dns.js

@@ -386,8 +386,6 @@ ObjectDefineProperties(module.exports,{
 get(){
 if(promises===null){
 promises=require('internal/dns/promises');
-promises.setServers=defaultResolverSetServers;
-promises.setDefaultResultOrder=setDefaultResultOrder;
 }
 returnpromises;
 }

lib/dns/promises.js

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

lib/internal/dns/promises.js

@@ -16,6 +16,8 @@ const{
  validateTries,
  emitInvalidHostnameWarning,
  getDefaultVerbatim,
+ setDefaultResultOrder,
+ setDefaultResolver,
 }=require('internal/dns/utils');
 const{ codes, dnsException }=require('internal/errors');
 const{ toASCII }=require('internal/idna');
@@ -312,6 +314,19 @@ Resolver.prototype.resolve = function resolve(hostname, rrtype){
 returnReflectApply(resolver,this,[hostname]);
 };
 
+functiondefaultResolverSetServers(servers){
+constresolver=newResolver();
 
-module.exports={ lookup, lookupService, Resolver };
+resolver.setServers(servers);
+setDefaultResolver(resolver);
+bindDefaultResolver(module.exports,Resolver.prototype);
+}
+
+module.exports={
+ lookup,
+ lookupService,
+ Resolver,
+ setDefaultResultOrder,
+setServers: defaultResolverSetServers,
+};
 bindDefaultResolver(module.exports,Resolver.prototype);