rollup.config.js

const { babel } = require('@rollup/plugin-babel');
const { nodeResolve } = require('@rollup/plugin-node-resolve');
const { default: typescript } = require('@rollup/plugin-typescript');
const { default: dotenv } = require('rollup-plugin-dotenv');

const extensions = ['.ts', '.js'];

const preventThreeShakingPlugin = () => {
  return {
    name: 'no-threeshaking',
    resolveId(id, importer) {
      // let's not theeshake entry points, as we're not exporting anything in App Scripts
      if (!importer) return { id, moduleSideEffects: 'no-treeshake' };
    },
  };
};

module.exports = {
  input: 'src/index.ts',
  output: [
    {
      dir: 'build',
      format: 'cjs',
    },
  ],
  plugins: [
    typescript({ tsconfig: './tsconfig.build.json' }),
    preventThreeShakingPlugin(),
    nodeResolve({
      extensions,
      mainFields: ['jsnext:main', 'main'],
    }),
    babel({
      extensions,
      babelHelpers: 'runtime',
      comments: false,
    }),
    dotenv(),
  ],
};