// rollup.config.js
import css from 'rollup-plugin-css-only'

export default {
  entry: 'entry.js',
  dest: 'bundle.js',
  plugins: [
    css({ output: 'bundle.css' })
  ]
}

// entry.js
import './reset.css'
import './layout.css'

import Vue from 'vue'

css({
  // Filename to write all styles to
  output: 'bundle.css',

  // Callback that will be called ongenerate with two arguments:
  // - styles: the contents of all style tags combined: 'body { color: green }'
  // - styleNodes: an array of style objects: [{lang: 'css', content: 'body { color: green }'}]
  output: function (styles, styleNodes) {
    writeFileSync('bundle.css', styles)
  },

  // Disable any style output or callbacks
  output: false,

  // Default behaviour is to write all styles to the bundle destination where .js is replaced by .css
  output: null
})