Function AsyncNoOutput

packages/react-dom/src/__tests__/ReactDOMFizzServer-test.js:5253–5256

()

  it('can emit the preamble even if the head renders asynchronously', async () => {
    function AsyncNoOutput() {
      readText('nooutput');
      return null;
    }
    function AsyncHead() {
      readText('head');
      return (