Enable ES6 in JSHint

- Also rename `Promise` to `Bluebird` since now JSHint complains that
`Promise` is already defined.

.jshintrc

@@ -19,6 +19,8 @@
     // @author http://michael.haschke.biz/
     // @license http://unlicense.org/
 
+    "esversion"     : 6,
+
     // == Enforcing Options ===============================================
     //
     // These options tell JSHint to be more strict towards your code. Use
@@ -53,8 +55,7 @@
     "boss"          : false,    // Tolerate assignments inside if, for & while. Usually conditions & loops are for comparison, not assignments.
     "debug"         : false,    // Allow debugger statements e.g. browser breakpoints.
     "eqnull"        : false,    // Tolerate use of `== null`.
-    "es5"           : false,    // Allow EcmaScript 5 syntax.
+    "esnext"        : true,     // Allow ES.next specific features such as `const` and `let`.
-    "esnext"        : false,    // Allow ES.next specific features such as `const` and `let`.
     "evil"          : false,    // Tolerate use of `eval`.
     "expr"          : true,     // Tolerate `ExpressionStatement` as Programs.
     "funcscope"     : false,    // Tolerate declarations of variables inside of control structures while accessing them later from the outside.

lib/src/dialog.js

@@ -15,7 +15,7 @@
  */
 
 var electron = require('electron');
-var Promise = require('bluebird');
+var Bluebird = require('bluebird');
 var _ = require('lodash');
 
 /**
@@ -37,7 +37,7 @@ var _ = require('lodash');
 exports.selectImage = function() {
   'use strict';
 
-  return new Promise(function(resolve) {
+  return new Bluebird(function(resolve) {
     electron.dialog.showOpenDialog({
       properties: [ 'openFile' ],
       filters: [

lib/src/drives.js

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-var Promise = require('bluebird');
+var Bluebird = require('bluebird');
-var drivelist = Promise.promisifyAll(require('drivelist'));
+var drivelist = Bluebird.promisifyAll(require('drivelist'));
 
 /**
  * @summary List all available removable drives

lib/src/writer.js

@@ -15,14 +15,14 @@
  */
 
 var imageWrite = require('resin-image-write');
-var Promise = require('bluebird');
+var Bluebird = require('bluebird');
-var umount = Promise.promisifyAll(require('umount'));
+var umount = Bluebird.promisifyAll(require('umount'));
 var fs = require('fs');
 var os = require('os');
 var isWindows = os.platform() === 'win32';
 
 if (isWindows) {
-  var removedrive = Promise.promisifyAll(require('removedrive'));
+  var removedrive = Bluebird.promisifyAll(require('removedrive'));
 }
 
 /**
@@ -79,7 +79,7 @@ exports.writeImage = function(image, drive, onProgress) {
     var stream = exports.getImageStream(image);
     return imageWrite.write(drive.device, stream);
   }).then(function(writer) {
-    return new Promise(function(resolve, reject) {
+    return new Bluebird(function(resolve, reject) {
       writer.on('progress', onProgress);
       writer.on('error', reject);
       writer.on('done', resolve);

tests/src/drives.spec.js

@@ -1,5 +1,5 @@
 var m = require('mochainon');
-var Promise = require('bluebird');
+var Bluebird = require('bluebird');
 var drivelist = require('drivelist');
 var drives = require('../../lib/src/drives');
 
@@ -12,7 +12,7 @@ describe('Drives:', function() {
 
       beforeEach(function() {
         this.drivesListStub = m.sinon.stub(drivelist, 'listAsync');
-        this.drivesListStub.returns(Promise.resolve([]));
+        this.drivesListStub.returns(Bluebird.resolve([]));
       });
 
       afterEach(function() {
@@ -40,7 +40,7 @@ describe('Drives:', function() {
         ];
 
         this.drivesListStub = m.sinon.stub(drivelist, 'listAsync');
-        this.drivesListStub.returns(Promise.resolve(this.drives));
+        this.drivesListStub.returns(Bluebird.resolve(this.drives));
       });
 
       afterEach(function() {
@@ -82,7 +82,7 @@ describe('Drives:', function() {
         ];
 
         this.drivesListStub = m.sinon.stub(drivelist, 'listAsync');
-        this.drivesListStub.returns(Promise.resolve(this.drives));
+        this.drivesListStub.returns(Bluebird.resolve(this.drives));
       });
 
       afterEach(function() {
@@ -115,7 +115,7 @@ describe('Drives:', function() {
 
       beforeEach(function() {
         this.drivesListStub = m.sinon.stub(drivelist, 'listAsync');
-        this.drivesListStub.returns(Promise.reject(new Error('scan error')));
+        this.drivesListStub.returns(Bluebird.reject(new Error('scan error')));
       });
 
       afterEach(function() {