Use Buffer.allocUnsafe() in enviroments that support it

lib/copy-sync/copy-file-sync.js

@@ -3,7 +3,7 @@
 const fs = require('graceful-fs')
 
 const BUF_LENGTH = 64 * 1024
-const _buff = new Buffer(BUF_LENGTH)
+const _buff = require('../util/buffer')(BUF_LENGTH)
 
 function copyFileSync (srcFile, destFile, options) {
   const overwrite = options.overwrite

lib/move-sync/index.js

@@ -5,6 +5,7 @@ const path = require('path')
 const copySync = require('../copy-sync').copySync
 const removeSync = require('../remove').removeSync
 const mkdirpSync = require('../mkdirs').mkdirsSync
+const buffer = require('../util/buffer')
 
 function moveSync (src, dest, options) {
   options = options || {}
@@ -60,7 +61,7 @@ function moveSyncAcrossDevice (src, dest, overwrite) {
 
 function moveFileSyncAcrossDevice (src, dest, overwrite) {
   const BUF_LENGTH = 64 * 1024
-  const _buff = new Buffer(BUF_LENGTH)
+  const _buff = buffer(BUF_LENGTH)
 
   const flags = overwrite ? 'w' : 'wx'
 

lib/util/buffer.js

@@ -0,0 +1,10 @@
+module.exports = function (size) {
+  if (typeof Buffer.allocUnsafe === 'function') {
+    try {
+      return Buffer.allocUnsafe(size)
+    } catch (e) {
+      return new Buffer(size)
+    }
+  }
+  return new Buffer(size)
+}