Function getRootNode

src/cdk/drag-drop/dom/root-node.ts:15–25

(viewRef: EmbeddedViewRef<any>, _document: Document)

 * If the root is not an HTML element it gets wrapped in one.
 */
export function getRootNode(viewRef: EmbeddedViewRef<any>, _document: Document): HTMLElement {
  const rootNodes: Node[] = viewRef.rootNodes;

  if (rootNodes.length === 1 && rootNodes[0].nodeType === _document.ELEMENT_NODE) {
    return rootNodes[0] as HTMLElement;
  }

  const wrapper = _document.createElement('div');
  rootNodes.forEach(node => wrapper.appendChild(node));
  return wrapper;
}