refactor: arrow functions

Author: brettz9

lib/node-static.js

@@ -194,12 +194,11 @@ class Server {
     }
 
     serve (req, res, callback) {
-        const that    = this,
-            promise = new(events.EventEmitter);
+        const promise = new(events.EventEmitter);
         let pathname;
 
-        const finish = function (status, headers, streaming) {
-            that.finish(status, headers, req, res, promise, callback, streaming);
+        const finish = (status, headers, streaming) => {
+            this.finish(status, headers, req, res, promise, callback, streaming);
         };
 
         try {
@@ -211,8 +210,8 @@ class Server {
             });
         }
 
-        process.nextTick(function () {
-            that.servePath(pathname, 200, {}, req, res, finish).on('success', function (result) {
+        process.nextTick(() => {
+            this.servePath(pathname, 200, {}, req, res, finish).on('success', function (result) {
                 promise.emit('success', result);
             }).on('error', function (err) {
                 promise.emit('error');