fix fs.exists bug

Author: yibuyisheng

lib/copy.js

@@ -59,7 +59,7 @@ function copySync(src, dest, filter, recursive) {
 
   var stats = recursive ? fs.lstatSync(src) : fs.statSync(src)
   var destFolder = path.dirname(dest)
-  var destFolderExists = fs.exists(destFolder) //<-- changing this to existsSync causes tests to fail despite the fact that existsSync is correct
+  var destFolderExists = fs.existsSync(destFolder)
   var performCopy = false
 
   if (stats.isFile()) {
@@ -72,7 +72,7 @@ function copySync(src, dest, filter, recursive) {
     }
   }
   else if (stats.isDirectory()) {
-    if (!destFolderExists) mkdir.mkdirsSync(dest)
+    if (!fs.existsSync(dest)) mkdir.mkdirsSync(dest)
     var contents = fs.readdirSync(src)
     contents.forEach(function(content) {
       copySync(path.join(src, content), path.join(dest, content), filter, true)