Function isValidContainer

packages/react-dom-bindings/src/client/ReactDOMContainer.js:19–29

(node: any)

} from './HTMLNodeType';

export function isValidContainer(node: any): boolean {
  return !!(
    node &&
    (node.nodeType === ELEMENT_NODE ||
      node.nodeType === DOCUMENT_NODE ||
      node.nodeType === DOCUMENT_FRAGMENT_NODE ||
      (!disableCommentsAsDOMContainers &&
        node.nodeType === COMMENT_NODE &&
        (node: any).nodeValue === ' react-mount-point-unstable '))
  );
}