webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');

const APP_ROOT = 'app';

module.exports = {
  entry: `./${APP_ROOT}/client`,
  devtool: 'inline-source-map',
  devServer: {
    historyApiFallback: true,
    contentBase: './dist',
    hot: true,
    proxy: [{
      context: ['/auth', '/api'],
      target: 'http://localhost:3000',
    }],
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        include: path.resolve(__dirname, APP_ROOT),
        loader: 'babel-loader',
        options: {
          cacheDirectory: true,
        },
      },
      {
        test: /\.scss$/,
        include: path.resolve(__dirname, APP_ROOT),
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: `./${APP_ROOT}/index.html`,
    }),
    new webpack.HotModuleReplacementPlugin(),
  ],
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
  },
};