rollup-plugin-css-porter/dist/rollup-plugin-css-porter.es.js

import { createFilter } from 'rollup-pluginutils';
import { EOL } from 'os';
import path from 'path';
import fsp from 'fs-promise';
import CleanCss from 'clean-css';

var ext = /\.css$/;

var index = function(options) {
  if ( options === void 0 ) options = {};

  if (!options.include) { options.include = '**/*.css'; }

  var filter = createFilter(options.include, options.exclude);
  var styles = {};
  return {
    name: 'rollup-plugin-css-porter',
    transform: function transform(code, id) {
      if (!ext.test(id)) { return }
      if (!filter(id)) { return }

      // cache all css code
      if (!styles.hasOwnProperty(id) || styles[id] != code) { styles[id] = code; }
      return ''
    },
    onwrite: function onwrite(opts) {
      if (!Object.keys(styles).length) { return } // nothing to output

      var outputRaw = options.raw !== false;
      var outputMinified = options.minified !== false;

      var customRawName = typeof options.raw === 'string';
      var customMinifiedName = typeof options.minified === 'string';

      // the file of output: use this plugin options.dest or `bundle.write()` options.dest
      var dest = options.dest || opts.dest;
      if (!dest && !customRawName && !customMinifiedName) { return } // output nothing if no dest config

      // remove js module extname
      if (dest) {
        dest = dest.slice(0, -1 * path.extname(dest).length);
      }

      // combine all css code
      var cssCode = [];
      Object.keys(styles).forEach(function (key) { return cssCode.push(styles[key]); });
      cssCode = cssCode.join(EOL); // join with platform line break

      var ops = [];

      if (outputRaw) {
        ops.push(fsp.writeFile(customRawName ? options.raw : dest + '.css', cssCode));
      }

      if (outputMinified) {
        ops.push(new Promise(function(resolve, reject) {
          new CleanCss(options.cleanCSSOptions).minify(cssCode, function (err, m) {
            if (err) { reject(err); }
            else { resolve(fsp.writeFile(customMinifiedName ? options.minified : dest + '.min.css', m.styles)); } // output minified css
          });
        }));
      }

      return Promise.all(ops)
    }
  }
};

export default index;