Refactor ensureLink

lib/ensure/link.js

@@ -1,27 +1,29 @@
-var path = require('path')
-var fs = require('graceful-fs')
-var mkdir = require('../mkdirs')
+'use strict'
+
+const path = require('path')
+const fs = require('graceful-fs')
+const mkdir = require('../mkdirs')
 
 function createLink (srcpath, dstpath, callback) {
   function makeLink (srcpath, dstpath) {
-    fs.link(srcpath, dstpath, function (err) {
+    fs.link(srcpath, dstpath, err => {
       if (err) return callback(err)
       callback(null)
     })
   }
 
-  fs.exists(dstpath, function (destinationExists) {
+  fs.exists(dstpath, destinationExists => {
     if (destinationExists) return callback(null)
-    fs.lstat(srcpath, function (err, stat) {
+    fs.lstat(srcpath, (err, stat) => {
       if (err) {
         err.message = err.message.replace('lstat', 'ensureLink')
         return callback(err)
       }
 
-      var dir = path.dirname(dstpath)
-      fs.exists(dir, function (dirExists) {
+      const dir = path.dirname(dstpath)
+      fs.exists(dir, dirExists => {
         if (dirExists) return makeLink(srcpath, dstpath)
-        mkdir.mkdirs(dir, function (err) {
+        mkdir.mkdirs(dir, err => {
           if (err) return callback(err)
           makeLink(srcpath, dstpath)
         })
@@ -31,7 +33,7 @@ function createLink (srcpath, dstpath, callback) {
 }
 
 function createLinkSync (srcpath, dstpath, callback) {
-  var destinationExists = fs.existsSync(dstpath)
+  const destinationExists = fs.existsSync(dstpath)
   if (destinationExists) return undefined
 
   try {
@@ -41,17 +43,17 @@ function createLinkSync (srcpath, dstpath, callback) {
     throw err
   }
 
-  var dir = path.dirname(dstpath)
-  var dirExists = fs.existsSync(dir)
+  const dir = path.dirname(dstpath)
+  const dirExists = fs.existsSync(dir)
   if (dirExists) return fs.linkSync(srcpath, dstpath)
   mkdir.mkdirsSync(dir)
 
   return fs.linkSync(srcpath, dstpath)
 }
 
 module.exports = {
-  createLink: createLink,
-  createLinkSync: createLinkSync,
+  createLink,
+  createLinkSync,
   // alias
   ensureLink: createLink,
   ensureLinkSync: createLinkSync