Function isValidContainer

docs/external/js/react-dom.development.js:24774–24776

(node)

    return new ReactDOMBlockingRoot(container, LegacyRoot, options);
  }
  function isValidContainer(node) {
    return !!(node && (node.nodeType === ELEMENT_NODE || node.nodeType === DOCUMENT_NODE || node.nodeType === DOCUMENT_FRAGMENT_NODE || node.nodeType === COMMENT_NODE && node.nodeValue === ' react-mount-point-unstable '));
  }

  var ReactCurrentOwner$3 = ReactSharedInternals.ReactCurrentOwner;
  var topLevelUpdateWarnings;