Webpack multiple CSS entrypoints

webpack.config.js

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

module.exports = {
  entry: {
    main: './src/index.js',
    base: './src/css/base.css',
    admin: './src/css/admin.css'
  },

  output: {
    filename: 'bundle-[name].js',
    path: path.resolve('dist')
  },

  module: {
    rules: [{
      test: /\.css$/,
      use: ExtractTextPlugin.extract({
        use: "css-loader"
      })
    }]
  },

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