Follow up on @rickhanlonii's comment: https://github.com/facebook/react/pull/22670#issuecomment-956569098
return `/** @license React v${reactVersion}
 * ${filename}
 *
${license}
 */
(function(){${source}})();`;
  },
  
  [NODE_DEV](source, globalName, filename, moduleType) {
    return `/** @license React v${reactVersion}
 * ${filename}
 *
${license}
 */
'use strict';
if (process.env.NODE_ENV !== "production") {
  (function() {
${source}
  })();
}`;
  },
  
  [NODE_PROD](source, globalName, filename, moduleType) {