webpack.config.js

const path = require('path');
const TerserPlugin = require('terser-webpack-plugin');
const DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');

module.exports = (env, argv) => ({
  mode: argv.mode,
  devtool: 'none',
  module: {
    rules: [
      {
        test: /node_modules\/(micromark-util-sanitize-uri|micromark-util-decode-numeric-character-reference)/,
        include: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              plugins: ['@babel/plugin-transform-numeric-separator'],
            },
          },
        ],
      },
    ],
  },
  output: {
    path: path.resolve(process.cwd(), 'dist'),
    filename: process.env.ROOT_FILE_NAME,
    globalObject: 'this',
    library: process.env.LIBRARY_NAME,
    // libraryExport: process.env.LIBRARY_NAME,
    libraryTarget: 'umd',
  },

  optimization: {
    minimizer: [
          new TerserPlugin({
            terserOptions: {
              ecma: 5,
              compress: {
                warnings: false,
                comparisons: false,
                inline: 2,
              },
              mangle: {
                safari10: true,
              },
              output: {
                ecma: 5,
                comments: false,
                ascii_only: true,
              },
            },
            parallel: true,
            cache: true,
            sourceMap: true,
          }),
        ],
  },

  plugins: [
    new CaseSensitivePathsPlugin(),
    new DuplicatePackageCheckerPlugin(),
  ],
})