webpack.config.js

const HtmlWebPackPlugin = require("html-webpack-plugin");
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const path = require('path');

module.exports = {
  entry: './src/app.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, './public')
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      }, {
        test: /\.(s*)css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader', 'sass-loader']
        })
      }, {
        test: /\.html$/,
        use: [
          {
            loader: "html-loader",
            options: {
              minimize: true
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebPackPlugin({template: "./src/index.html"}),
    new ExtractTextPlugin({filename: 'app.bundle.css'})
  ]
};