Replace require with import

lib/cli.js

@@ -4,17 +4,15 @@ import which from 'which'
 import parseArgs from 'minimist'
 import semver from 'semver'
 import path from 'path'
+import { exec } from 'child_process'
+import phantom from 'phantomjs'
 
-var exec = require('child_process').exec
+import pkg from '../package.json'
 
-var PHANTOM_VERSION = '^2.1.0'
+var PHANTOM_VERSION = '^2.1.15'
 
 var info = chalk.blue.bold
 
-module.exports = (function () {
-  return new Cli()
-}())
-
 function Cli (options) {
   this.options = {
     alias: {
@@ -63,9 +61,7 @@ function Cli (options) {
 Cli.prototype.parse = function (argv, next) {
   this.errors = [] // clear errors
   var options = parseArgs(argv, this.options)
-
   if (options.version) {
-    var pkg = require('../package.json')
     this.message = '' + pkg.version
     next(null, this.message)
   } else if (options.help) {
@@ -151,10 +147,8 @@ function createCheckPhantom (_phantomPath) {
   return function checkPhantom (_next) {
     var next = _next || function () { }
     var err
-
     if (typeof phantomPath === 'undefined') {
       try {
-        var phantom = require('phantomjs')
         phantomPath = phantom.path
       } catch (e) {
         try {
@@ -195,3 +189,9 @@ function createCheckPhantom (_phantomPath) {
     })
   }
 }
+
+const cli = (function () {
+  return new Cli()
+}())
+
+export default cli