webpack.config.js

const path = require('path');
const webpack = require('webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  entry: ['babel-polyfill' ,'./src/index.js'],

  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        enforce: 'pre',
        loader: 'eslint-loader',
        exclude: /node_modules/,
        options: {
          emitWarning: true,
          configFile: './.eslintrc.json'
        }
      },
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      },
      {
        test: /.(css|scss)$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: false,
            },
          },
          'sass-loader'
        ]
      },
      {
        test: /.(jpg|jpeg|png|gif|mp3|svg)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[path][name]-[hash:8].[ext]'
            }
          }
        ]
      }
    ]
  },

  resolve: {
    extensions: ['*', '.js', '.jsx']
  },

  output: {
    path: path.resolve(__dirname, 'dist/'),
    publicPath: '/dist/',
    filename: 'bundle.js'
  },

  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new MiniCssExtractPlugin({
      filename: '[name].css',
      chunkFilename: '[id].css'
    })
  ],

  devServer: {
    contentBase: path.join(__dirname, 'public/'),
    port: 3000,
    publicPath: 'http://localhost:3000/dist/',
    hotOnly: true,
    historyApiFallback: true,
  }
};