refactor: imports

Author: snitin315

lib/Server.js

@@ -549,6 +549,9 @@ class Server {
   }
 
   createServer() {
+    const https = require('https');
+    const http = require('http');
+
     if (this.options.https) {
       if (this.options.http2) {
         // TODO: we need to replace spdy with http2 which is an internal module
@@ -562,13 +565,9 @@ class Server {
           this.app
         );
       } else {
-        const https = require('https');
-
         this.server = https.createServer(this.options.https, this.app);
       }
     } else {
-      const http = require('http');
-
       this.server = http.createServer(this.app);
     }