Merge pull request ember-fastboot#201 from SergeAstapov/remove-exists-sync

Remove usage of deprecated exists-sync

Author: rwjblue

package.json

@@ -29,7 +29,6 @@
     "chalk": "^2.0.1",
     "cookie": "^0.3.1",
     "debug": "^3.0.0",
-    "exists-sync": "0.0.4",
     "najax": "^1.0.2",
     "rsvp": "^4.7.0",
     "simple-dom": "^1.0.0",

src/ember-app.js

@@ -6,7 +6,6 @@ const chalk = require('chalk');
 
 const najax = require('najax');
 const SimpleDOM = require('simple-dom');
-const existsSync = require('exists-sync');
 const debug = require('debug')('fastboot:ember-app');
 
 const FastBootInfo = require('./fastboot-info');
@@ -123,7 +122,7 @@ class EmberApp {
       if (whitelist.indexOf(moduleName) > -1) {
         let nodeModulesPath = path.join(distPath, 'node_modules', moduleName);
 
-        if (existsSync(nodeModulesPath)) {
+        if (fs.existsSync(nodeModulesPath)) {
           return require(nodeModulesPath);
         } else {
           // If it's not on disk, assume it's a built-in node package

test/fixtures/custom-sandbox/custom-sandbox.js

@@ -1,8 +1,6 @@
 'use strict';
 
 const vm = require('vm');
-const fs = require('fs');
-const existsSync = require('exists-sync');
 const Sandbox = require('./../../../src/sandbox');
 
 /**