p5.js-web-editor/webpack/config.babel.js

const ExtractTextPlugin = require('extract-text-webpack-plugin');
const cssnext = require('postcss-cssnext');
const postcssFocus = require('postcss-focus');
const postcssReporter = require('postcss-reporter');

module.exports = {
  output: {
    publicPath: '/',
    libraryTarget: 'commonjs2',
  },
  resolve: {
    extensions: ['', '.js', '.jsx'],
    modules: [
      'client',
      'node_modules',
    ],
  },
  module: {
    loaders: [
      {
        test: /main\.scss$/,
        exclude: /node_modules/,
        loader: ExtractTextPlugin.extract({
            fallback: 'style-loader',
            use: 'css-loader!sass-loader!postcss-loader'
        })
      },
      {
        test: /\.jpe?g$|\.gif$|\.png$|\.svg$|\.mp3$|\.eot$|\.ttf$|\.woff$|\.woff2$/i,
        loader: 'url-loader?limit=10000',
      },
    ],
  },
  postcss: () => [
    postcssFocus(),
    cssnext({
      browsers: ['last 2 versions', 'IE > 10'],
    }),
    postcssReporter({
      clearMessages: true,
    }),
  ],
};