title: What does mean "export default {}" without name
body: <p>I found react native module with code like this:</p>
  
  <pre><code>export default {
      activateWithApiKey(apiKey: string) {
          AppMetrica.activateWithApiKey(apiKey);
      },
  };
  </code></pre>
  
  <p>It is strange that "export default" doesn't have name. All of the examples from google search has "export default SomeName".
  Does anybody know what "export default" without name means?
  Thank you for help.</p>