Add existing code

webpack.dev.js

@@ -0,0 +1,17 @@
+const path = require('path')
+const HtmlWebpackPlugin = require('html-webpack-plugin')
+
+module.exports = {
+  devtool: '#eval-source-map',
+  entry: './demo/index.js',
+  output: {
+    path: path.resolve(__dirname, './demo')
+  },
+  plugins: [
+    new HtmlWebpackPlugin({
+      filename: 'index.html',
+      template: './demo/index.html'
+    })
+  ]
+}
+