webpack.config.js

const path = require('path');
const webpack = require('webpack');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

const config = {
  mode: 'production',
  entry: {
    index: path.resolve(__dirname, 'src/index.js'),
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js',
    libraryTarget: 'umd',
    hashFunction: 'xxhash64',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /(node_modules|webpack)/,
        loader: 'babel-loader',
      },
    ],
  },
  plugins: [new CleanWebpackPlugin()],
  externals: {
    react: {
      commonjs: 'react',
      commonjs2: 'react',
      amd: 'React',
      root: 'React',
    },
    'react-dom': {
      commonjs: 'react-dom',
      commonjs2: 'react-dom',
      amd: 'ReactDOM',
      root: 'ReactDOM',
    },
  },
  resolve: {
    alias: {
      react: path.resolve(__dirname, './node_modules/react'),
      'react-dom': path.resolve(__dirname, './node_modules/react-dom'),
    },
    modules: ['node_modules', path.join(__dirname, 'src')],
    extensions: ['.js', '.jsx'],
  },
};

module.exports = config;