rollup.config.js

'use strict';

let fs = require('fs'),
  json = require('rollup-plugin-json'),
  postcss = require('postcss'),
  buble = require('rollup-plugin-buble'),
  nodeResolve = require('rollup-plugin-node-resolve'),
  commonjs = require('rollup-plugin-commonjs'),
  scss = require('rollup-plugin-scss'),
  //post CSS plugins:
  comments = require('postcss-discard-comments'),
  dupes = require('postcss-discard-duplicates'),
  cssnext = require('postcss-cssnext'),
  replace = require('rollup-plugin-replace');

function getPlugins({
  external
}, withScss = true) {
  const scssPlugins = [scss({
      output(styles, styleNodes) {
        postcss([cssnext, comments, dupes])
          .process(styles)
          .then(result => {
            fs.writeFile('./dist/index.css', result.css);
          });
      }
    })];
  const defaultPlugins = [
    json(),
    buble({
      objectAssign: '_extend',
      exclude: ['./node_modules/**/*']
    }),
    nodeResolve({
      browser: true,
      jsnext: true,
      main: true
    }),
    commonjs(),
    replace({
      'process.env.NODE_ENV': JSON.stringify('production')
    })
  ];

  return withScss
    ? scssPlugins.concat(defaultPlugins)
    : defaultPlugins;
}

function getConfig({
  external = [],
  globals = {},
  input = 'client/index.js'
}, withScss = true) {
  return {
    input,
    external,
    globals,
    plugins: getPlugins({external}, withScss),
  };
}

module.exports = getConfig({
  external: [
    'underscore',
    'react',
    'react-dom',
    'react-router-dom',
    'doctrine-standalone',
    'babel-standalone'
  ],
  globals: {
    'underscore': '_',
    'react': 'React',
    'react-dom': 'ReactDOM',
    'react-router-dom':'ReactRouterDOM',
    'doctrine-standalone': 'doctrine',
    'babel-standalone': 'Babel'
  }
});