rollup.config.js

import terser from "@rollup/plugin-terser";
import babel from '@rollup/plugin-babel';

const devMode = (process.env.NODE_ENV === 'development');
console.log(`${devMode ? 'development' : 'production'} node bundle`)

export default [
  {
    input: 'src/index.js',
    output: {
      file: 'dist/index.js',
      format: 'es',
      sourcemap: devMode ? 'inline' : false,
      plugins: [
        terser({
          ecma: 2020,
          mangle: { toplevel: true },
          compress: {
            module: true,
            toplevel: true,
            unsafe_arrows: true,
            drop_console: !devMode,
            drop_debugger: !devMode,
          },
          output: {
            quote_style: 1,
          }
        })
      ],
    },
    plugins: [
      babel({
        presets: ['@babel/preset-react'],
        babelHelpers: 'bundled'
      })
    ]
  }
]