refactor: code

Author: snitin315

lib/Server.js

@@ -751,13 +751,10 @@ class Server {
   }
 
   listen(port, hostname, fn) {
-    if (hostname === 'local-ip') {
-      this.options.host =
-        internalIp.v4.sync() || internalIp.v6.sync() || '0.0.0.0';
-    } else if (hostname === 'local-ipv4') {
-      this.options.host = internalIp.v4.sync() || '0.0.0.0';
-    } else if (hostname === 'local-ipv6') {
-      this.options.host = internalIp.v6.sync() || '::';
+    if (typeof hostname !== 'undefined' && hostname !== this.options.host) {
+      throw new Error(
+        'The host specified in options is different from the host passed as an argument.'
+      );
     }
 
     if (typeof port !== 'undefined' && port !== this.options.port) {
@@ -766,10 +763,15 @@ class Server {
       );
     }
 
-    if (typeof hostname !== 'undefined' && hostname !== this.options.host) {
-      throw new Error(
-        'The host specified in options is different from the host passed as an argument.'
-      );
+    if (hostname === 'local-ip') {
+      this.options.host =
+        internalIp.v4.sync() || internalIp.v6.sync() || '0.0.0.0';
+    } else if (hostname === 'local-ipv4') {
+      this.options.host = internalIp.v4.sync() || '0.0.0.0';
+    } else if (hostname === 'local-ipv6') {
+      this.options.host = internalIp.v6.sync() || '::';
+    } else {
+      this.options.host = hostname;
     }
 
     return (