webpack.config.js

const webpack = require('webpack');

module.exports = {
  entry: [
    'react-hot-loader/patch',
    './src/index.js'
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      },
      {
        test: /\.(scss|sass)$/,
        use: [
          {loader: 'style-loader'},
          {loader: 'css-loader'},
          {
            loader: 'postcss-loader',
            options: {
              plugins: function () {
                return [
                  require('precss'),
                  require('autoprefixer')
                ];
              }
            }
          },
          {loader: 'sass-loader'}
        ]
      }
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  output: {
    path: __dirname + '/dist',
    publicPath: '/',
    filename: 'bundle.js'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin()
  ],
  devtool: 'source-map',
  devServer: {
    contentBase: './dist',
    hot: true
  },
  stats: { warnings: false }
};