Function getRootNode

src/ink/focus.ts:166–173

(node: DOMElement)

 * the FocusManager — like browser's `node.getRootNode()`.
 */
export function getRootNode(node: DOMElement): DOMElement {
  let current: DOMElement | undefined = node
  while (current) {
    if (current.focusManager) return current
    current = current.parentNode
  }
  throw new Error('Node is not in a tree with a FocusManager')
}

/**
 * Walk up to root and return its FocusManager.