Rewrite karma config in ES6

karma.conf.js

@@ -0,0 +1,36 @@
+require('webpack');
+
+var pkg = require('./package.json');
+var ExtractTextPlugin = require('extract-text-webpack-plugin');
+
+module.exports = function (config) {
+  config.set({
+    browsers: ['PhantomJS'],
+    singleRun: true,
+    frameworks: ['mocha'],
+    files: [
+      './node_modules/phantomjs-polyfill/bind-polyfill.js',
+      './node_modules/babel-core/browser-polyfill.js',
+      './node_modules/react/dist/react-with-addons.js',
+      'tests.webpack.js'
+    ],
+    reporters: ['dots'],
+    preprocessors: {'tests.webpack.js': ['webpack']},
+    webpack: {
+      resolve: { extensions: ['', '.jsx', '.cjsx', '.coffee', '.js', '.json', '.styl'] },
+      module: {
+        loaders: [
+          { test: /(\.js|\.jsx)$/, exclude: /(node_modules)/, loader: 'babel'},
+          { test: /\.cjsx$/, loader: 'coffee-jsx-loader'},
+          { test: /\.coffee$/, loader: 'coffee-jsx-loader'},
+          { test: /\.styl$/, loader: ExtractTextPlugin.extract('style-loader', 'css-loader?modules&importLoaders=1&localIdentName=[hash:base64:5]!stylus-loader')}
+        ]
+      },
+      watch: true,
+      plugins: [new ExtractTextPlugin(pkg.name + '.[name].css', {allChunks: false})]
+    },
+    webpackServer: {
+      noInfo: true
+    }
+  });
+};