next-csrf/example/node_modules/ally.js/esm/get/shadow-host.js

CSRF mitigation library for Next.js

import contextToElement from '../util/context-to-element';

export default function () {
  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      context = _ref.context;

  var element = contextToElement({
    label: 'get/shadow-host',
    context: context
  });

  // walk up to the root
  var container = null;

  while (element) {
    container = element;
    element = element.parentNode;
  }

  // https://developer.mozilla.org/en-US/docs/Web/API/Node.nodeType
  // NOTE: Firefox 34 does not expose ShadowRoot.host (but 37 does)
  if (container.nodeType === container.DOCUMENT_FRAGMENT_NODE && container.host) {
    // the root is attached to a fragment node that has a host
    return container.host;
  }

  return null;
}
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