ensure to set output bundle name

config/webpack.dev.js

@@ -22,6 +22,9 @@ module.exports = require('./webpack.common')({
   entry: {
     dev: './resource/js/dev',
   },
+  output: {
+    filename: '[name].bundle.js',
+  },
   resolve: {
     // TODO merge in webpack.common.js
     modules: [path.join(process.env.HOME, '.node_modules')],