webpack.config.js

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

module.exports = {
  entry: {
    src: './client/main.js',
  },
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'build'),
    publicPath: '/',
  },
  mode: 'development',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: {
          presets: ['@babel/env', '@babel/react'],
        },
      },
      {
        test: /\.s?css$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: 'Development',
      template: 'index.html',
    }),
  ],
  devServer: {
    static: {
      publicPath: '/',
      directory: path.resolve(__dirname, 'build'),
    },
    port: 8080,
    proxy: [
      {
        context: ['/'],
        target: 'http://localhost:3000',
      },
    ],
  },
};