rocket/scripts/update-esm-entrypoints.mjs

import fs from 'fs';
import path from 'path';
import { createRequire } from 'module';
import { packages } from '../workspace-packages.mjs';

const require = createRequire(import.meta.url);

for (const pkg of packages) {
  if (pkg.type === 'ts' && pkg.environment === 'node') {
    const pkgPath = path.join(process.cwd(), 'packages', pkg.name);
    const cjsModule = require(path.join(pkgPath, 'dist', 'index.js'));
    const namedExports = Object.keys(cjsModule)
      .filter(name => name !== 'default' && !name.startsWith('_'))
      .join(', ');
    const esmEntrypoint = `// this file is autogenerated with the update-esm-entrypoints script
import cjsEntrypoint from './dist/index.js';

const { ${namedExports} } = cjsEntrypoint;

export { ${namedExports} }`;
    const esmEntrypointDts = "export * from './dist/index.js'";

    fs.writeFileSync(path.join(pkgPath, 'index.mjs'), esmEntrypoint);
    fs.writeFileSync(path.join(pkgPath, 'index.d.ts'), esmEntrypointDts);
  }
}