webpack.config.js

const webpack = require('webpack')
const autoprefixer = require('autoprefixer')
const precss = require('precss')
const ExtractTextPlugin = require('extract-text-webpack-plugin')

module.exports = {
  entry: ['react-hot-loader/patch', './src/index.js'],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(scss)$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: 'css-loader'
            },
            {
              loader: 'postcss-loader',
              options: {
                plugins () {
                  return [precss, autoprefixer]
                }
              }
            },
            {
              loader: 'sass-loader'
            }
          ]
        })
      },
      {
        test: /bootstrap\/dist\/js\/umd\//,
        use: 'imports-loader?jQuery=jquery'
      }
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  output: {
    path: __dirname + '/dist',
    publicPath: '/',
    filename: 'bundle.js'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.ProvidePlugin({
      $: 'jquery',
      jQuery: 'jquery',
      Popper: ['popper.js', 'default']
    })
  ],
  devServer: {
    contentBase: './dist',
    host: '127.0.0.1',
    port: 3000,
    hot: true,
    publicPath: '/',
    historyApiFallback: true
  },
  devtool: 'eval-source-map'
}