update dependencies

app/node_modules/fs-extra/lib/copy-sync/copy-file-sync.js

@@ -1,26 +1,28 @@
-var fs = require('graceful-fs')
+'use strict'
 
-var BUF_LENGTH = 64 * 1024
-var _buff = new Buffer(BUF_LENGTH)
+const fs = require('graceful-fs')
+
+const BUF_LENGTH = 64 * 1024
+const _buff = require('../util/buffer')(BUF_LENGTH)
 
 function copyFileSync (srcFile, destFile, options) {
-  var clobber = options.clobber
-  var preserveTimestamps = options.preserveTimestamps
+  const overwrite = options.overwrite
+  const errorOnExist = options.errorOnExist
+  const preserveTimestamps = options.preserveTimestamps
 
   if (fs.existsSync(destFile)) {
-    if (clobber) {
-      fs.chmodSync(destFile, parseInt('777', 8))
+    if (overwrite) {
       fs.unlinkSync(destFile)
-    } else {
-      throw Error('EEXIST')
-    }
+    } else if (errorOnExist) {
+      throw new Error(`${destFile} already exists`)
+    } else return
   }
 
-  var fdr = fs.openSync(srcFile, 'r')
-  var stat = fs.fstatSync(fdr)
-  var fdw = fs.openSync(destFile, 'w', stat.mode)
-  var bytesRead = 1
-  var pos = 0
+  const fdr = fs.openSync(srcFile, 'r')
+  const stat = fs.fstatSync(fdr)
+  const fdw = fs.openSync(destFile, 'w', stat.mode)
+  let bytesRead = 1
+  let pos = 0
 
   while (bytesRead > 0) {
     bytesRead = fs.readSync(fdr, _buff, 0, BUF_LENGTH, pos)