webpack.config.build.js

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const common = require('./webpack.config.common');

const ROOT_PATH = path.resolve(__dirname);

module.exports = merge(common, {
  mode: 'production',
  entry: {
    'material-ui-banner': path.resolve(ROOT_PATH, 'src/index.js'),
  },
  externals: [
    {
      react: {
        root: 'React',
        commonjs2: 'react',
        commonjs: 'react',
        amd: 'react',
      },
      'react-dom': {
        root: 'ReactDOM',
        commonjs2: 'react-dom',
        commonjs: 'react-dom',
        amd: 'react-dom',
      },
    },
    "@mui/material",
    /@mui\/material\/*./,
    'clsx',
  ],
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify('production'),
      },
      __DEV__: false,
    }),
  ],
});