webpack.config.js

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

module.exports = {
    entry: './app/assets/javascripts/entry.js',
    output: {
        path: __dirname + '/public/compiled',
        filename: 'bundle.js'
    },
    module: {
        loaders: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
                options: {
                    plugins: [
                        [
                            'react-transform',
                            {
                                transforms: [
                                    {
                                        transform: 'react-transform-hmr',
                                        imports: ['react'],
                                        locals: ['module'],
                                    },
                                ],
                            },
                        ],
                    ],
                },
            },
            {
                test: /\.jsx?$/,
                loader: 'babel-loader',
                include: /ui/,
                query: {
                    presets: ['es2015', 'stage-0', 'react']
                }
            },
            {
                test: /\.css$/,
                use: ExtractTextPlugin.extract({
                    fallback: "style-loader",
                    use: "css-loader"
                })
            },
            {
                test: /\.png$/,
                loader: "url-loader?limit=100000"
            },
            {
                test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,
                loader: 'url-loader?limit=10000&mimetype=application/font-woff'
            },
            {
                test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
                loader: 'url-loader?limit=10000&mimetype=application/octet-stream'
            },
            {
                test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,
                loader: 'file-loader'
            },
            {
                test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
                loader: 'url-loader?limit=10000&mimetype=image/svg+xml'
            }
        ]
    },
    plugins: [
        new ExtractTextPlugin("styles.css"),
    ]
};