pre:

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

const BUILD_DIR = path.resolve(__dirname, 'src/public');
const APP_DIR = path.resolve(__dirname, 'src/app');

const config = {
    entry: APP_DIR + '/index.jsx',
    output: {
        path: BUILD_DIR,
        filename: 'bundle.js'
    },
    module: {
        loaders: [
            {
                test: /\.jsx?/,
                include: APP_DIR,
                loader: 'babel'
            },
            {
                test: /\.css$/,
                loader: ExtractTextPlugin.extract(["style", "css"])
            },
            {
                test: /\.scss$/,
                loader: ExtractTextPlugin.extract(["css", "sass"])
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin('site.css', {
            allChunks: true
        })
    ]
};

module.exports = config;