Basic webpack setup for phoenix project

webpack.config.js

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

module.exports = {
  entry: ["./css/web.css", "./js/web.js"],
  output: {
    path: path.resolve(__dirname, "../priv/static"),
    filename: "js/web.js"
  },
  devtool: 'source-map',
  resolve: {
    modules: [ "node_modules", path.resolve(__dirname, "js") ]
  },
  module: {
    loaders: [{
      test: /\.js$/,
      exclude: /node_modules/,
      loader: "babel-loader",
      include: __dirname,
      query: {
        presets: ["babel-preset-es2015", "babel-preset-env"].map(require.resolve)
      }
    }, {
      test: /\.css$/,
      use: ExtractTextPlugin.extract({
        fallback: "style-loader",
        use: [{
          loader: 'css-loader'
        }, {
          loader: 'sass-loader'
        }]
      }),
    }, {
      test: /\.scss$/,
      use: ExtractTextPlugin.extract({
        fallback: "style-loader",
        use: [{
          loader: 'css-loader'
        }, {
          loader: 'sass-loader'
        }]
      }),
    }]
  },
  plugins: [
    new ExtractTextPlugin("css/web.css"),
    new CopyWebpackPlugin([{ from: "./static" }])
  ]
};