webpack.config.js

const path = require('path')
const ExtractTextPlugin = require('extract-text-webpack-plugin')

module.exports = {
  entry: './_dev/js/app.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'webresources')
  },

  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
      },

      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: 'css-loader'
        })
      },

      {
        test: /\.less$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: 'css-loader!less-loader'
        })
      }
    ]
  },

  plugins: [
    new ExtractTextPlugin('bundle.css')
  ]
}