webpack.config.js

const webpack = require('webpack');
const path = require('path');

module.exports = {
  entry: [
    'react-hot-loader/patch',
    'webpack-dev-server/client?http://localhost:8080',
    'webpack/hot/only-dev-server',
    path.resolve(__dirname, 'src', 'index.js')
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader', 'eslint-loader']
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.(jpe?g|png|gif|ico)$/, loader: 'file-loader?name=[name].[ext]'
      }
    ]
  },
  resolve: {
    modules: [path.resolve(__dirname, 'node_modules')],
    extensions: ['*', '.js', '.jsx']
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
    filename: 'bundle.js'
  },
  devServer: {
    contentBase: path.resolve(__dirname, 'dist'),
    publicPath: '/',
    compress: true,
    hot: true,
    historyApiFallback: true
  },
  plugins: [
    new webpack.NamedModulesPlugin(),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.ProvidePlugin({
      fetch: 'imports-loader?this=>global!exports-loader?global.fetch!whatwg-fetch'
    }),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"development"'
      }
    }),
  ],
  devtool: 'source-map'
};