esm/cjs module bootstrap

entry.ts

async function main() {
  console.log('main');
}

(async function () {
  if ('undefined' !== typeof module) {
    return require.main === module && main();
  }
  // eslint-disable-next-line no-new-func
  const meta: ImportMeta = new Function('import.meta')();
  const process = await import('process');
  const { createRequire } = (await import('module')).Module;
  const scriptPath = createRequire(meta.url).resolve(process.argv[1]);

  const modulePath = (await import('url')).fileURLToPath(meta.url);

  const { extname } = await import('path');
  const extension = extname(scriptPath);
  let isMain: boolean;
  if (extension) {
    isMain = modulePath === scriptPath;
  } else {
    const moduleExt = extname(modulePath);
    isMain = modulePath.slice(0, -moduleExt.length) === scriptPath;
  }
  return isMain && main();
})();