Webpack with extract text

webpack.config.js

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

module.exports = {
  entry: "./web/static/app/app.js",

  output: {
    path: "./priv/static/js",
    filename: "app.js"
  },

  module: {
    loaders: [
      { test: /\.coffee$/,   loader: 'coffee-loader' },
      { test: /\.(js|jsx)$/, loader: "babel-loader", exclude: /node_modules/ },
      { test: /\.scss$/,     loader: ExtractTextPlugin.extract("css!autoprefixer!sass?outputStyle=compact") }
    ]
  },

  resolve: {
    extensions: ["", ".js", ".jsx", ".coffee"]
  },

  plugins: [
    new ExtractTextPlugin("../css/app.css", {
      allChunks: true
    })
  ]
};