webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');

const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
  template: __dirname + '/app/index.html',
  filename: 'index.html',
  inject: 'body'
});

const ExtractTextPluginConfig = new ExtractTextPlugin('style.css');

const entrypoint = process.env.npm_lifecycle_event === 'dev' ?
  'webpack-dev-server/client?http://localhost:8080' :
  './app/index.js';

module.exports = {
  devtool: 'source-map',
  entry: entrypoint,
  output: {
    path: __dirname + '/dist',
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        include: __dirname + '/app',
        loader: 'babel-loader',
        query: {
          presets: ['es2015', 'stage-0']
        }
      },
      {
        test: /\.scss$/,
        include: __dirname + '/app',
        loader: ExtractTextPlugin.extract('css-loader!sass-loader')
      },
      {
        test: /\.wasm$/,
        loaders: ['wasm-loader']
      }
    ]
  },
  plugins: [
    HtmlWebpackPluginConfig,
    ExtractTextPluginConfig,
    // Need to copy some wasm files as we import the JS file from the emcc MODULARIZE setting
    new CopyWebpackPlugin([{
      from: 'app/wasm/*.wasm',
      to: 'wasm/[name].wasm'
    }])
  ],
  node: {
    fs: 'empty'
  }
};