webpack config with css, etc.

gistfile1.txt

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

var commonLoaders = [
  {
    test: /\.css$/,
    loader: ExtractTextPlugin.extract('style-loader', 'css-loader!autoprefixer-loader?browsers=last 3 versions')
  }, {
    test: /\.less$/,
    loader: ExtractTextPlugin.extract('style-loader', 'css-loader!autoprefixer-loader?browsers=last 3 versions!less-loader')
  }, {
    test: /\.sass/,
    loader: ExtractTextPlugin.extract('style-loader', 'css-loader!autoprefixer-loader?browsers=last 3 versions!sass-loader')
  }, {
    test: /\.scss/,
    loader: ExtractTextPlugin.extract('style-loader', 'css-loader!autoprefixer-loader?browsers=last 3 versions!sass-loader')
  },
  {
    test: /\.js$/,
    loaders: ['babel-loader'],
    exclude: /node_modules/
  }, {
    test: /\.json$/,
    loaders: ['json-loader']
  }
];

var assetsPath = path.join(__dirname, '/dist');
var publicPath = '/app/webpack/dist/';

module.exports = {
  name: 'browser',
  entry: [
    path.join(__dirname, '/node_modules/babel-core/polyfill.js'),
    path.join(__dirname, '/src/MyApp.js')
  ],
  output: {
    path: assetsPath,
    publicPath: publicPath,
    filename: 'bundle.js'
  },
  module: {
    loaders: commonLoaders.concat([{
      test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/,
      loader: 'url-loader?limit=10000&mimetype=application/font-woff'
    }, {
      test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
      loader: 'file-loader'
    }, {
      test: /\.gif/,
      loader: 'url-loader?limit=10000&mimetype=image/gif'
    }, {
      test: /\.jpg/,
      loader: 'url-loader?limit=10000&mimetype=image/jpg'
    }, {
      test: /\.png/,
      loader: 'url-loader?limit=10000&mimetype=image/png'
    }, {
      test: /\.jsx?$/,
      exclude: /node_modules/,
      loader: 'babel-loader',
      query: {
        cacheDirectory: true
      }
    }])
  },
  plugins: [
    new ExtractTextPlugin('bundle.css', {
      allChunks: true
    })
  ]
};

Thanks for taking the time to put this together! How are you exactly using this with Rails? Or is your front end separated out?