Ensure webpack config is valid

package.json

@@ -54,6 +54,7 @@
     "node-sass": "^3.4.2",
     "nodemon": "^1.9.1",
     "nyc": "^11.0.3",
+    "open": "0.0.5",
     "opn-cli": "^3.1.0",
     "postcss-cli": "^2.5.1",
     "sinon": "^2.4.0",
@@ -66,6 +67,7 @@
   "dependencies": {
     "classnames": "^2.2.5",
     "fuse.js": "^3.1.0",
+    "opn": "^5.1.0",
     "redux": "^3.3.1"
   },
   "npmName": "choices.js",

webpack.config.dev.js

@@ -1,14 +1,15 @@
-var path = require('path');
-var webpack = require('webpack');
-var Dashboard = require('webpack-dashboard');
-var DashboardPlugin = require('webpack-dashboard/plugin');
-var dashboard = new Dashboard();
+const path = require('path');
+const webpack = require('webpack');
+const Dashboard = require('webpack-dashboard');
+const DashboardPlugin = require('webpack-dashboard/plugin');
+
+const dashboard = new Dashboard();
 
 module.exports = {
   devtool: 'eval',
   entry: [
     'webpack-dev-server/client?http://localhost:3000',
-    './src/scripts/src/choices'
+    './src/scripts/src/choices',
   ],
   output: {
     path: path.join(__dirname, 'dist'),
@@ -17,24 +18,33 @@ module.exports = {
     library: 'Choices',
     libraryTarget: 'umd',
   },
-  eslint: {
-    configFile: '.eslintrc'
-  },
   plugins: [
     new DashboardPlugin(dashboard.setData),
     new webpack.HotModuleReplacementPlugin(),
     new webpack.DefinePlugin({
       'process.env': {
-        'NODE_ENV': JSON.stringify('development')
-      }
-    })
+        NODE_ENV: JSON.stringify('development'),
+      },
+    }),
   ],
   module: {
-    loaders: [{
-      test: /\.js$/,
-      exclude: /(node_modules|bower_components)/,
-      loaders: ['babel', 'eslint-loader'],
-      include: path.join(__dirname, 'src/scripts/src')
-    }]
-  }
+    rules: [
+      {
+        enforce: 'pre',
+        test: /\.js?$/,
+        include: path.join(__dirname, 'src/scripts/src'),
+        exclude: /(node_modules|bower_components)/,
+        loader: 'eslint-loader',
+        query: {
+          configFile: '.eslintrc',
+        },
+      },
+      {
+        test: /\.js?$/,
+        include: path.join(__dirname, 'src/scripts/src'),
+        exclude: /(node_modules|bower_components)/,
+        loader: 'babel-loader',
+      },
+    ],
+  },
 };