Function getStyleHost

packages/core/src/render3/component_ref.ts:502–514

(node: RNode, doc: () => Document)

}

function getStyleHost(node: RNode, doc: () => Document): Node {
  const rootNode = node.getRootNode?.();

  if (documentSupported && rootNode instanceof Document) {
    return rootNode.head; // Connected to document.
  } else if (!rootNode) {
    return doc().head; // `getRootNode` not supported, Node.js use case.
  } else if (shadowRootSupported && rootNode instanceof ShadowRoot) {
    return rootNode; // Shadow root
  } else {
    return doc().head; // Disconnected element, use fallback document.
  }
}

function getRootTViewTemplate(
  creationBindings: Binding[] | null,