function hasWindow() {
  return typeof window !== 'undefined';
}
function getNodeName(node) {
  if (isNode(node)) {
    return (node.nodeName || '').toLowerCase();
  }
  // Mocked nodes in testing environments may not be instances of Node. By
  // returning `#document` an infinite loop won't occur.
  // https://github.com/floating-ui/floating-ui/issues/2317
  return '#document';
}
function getWindow(node) {
  var _node$ownerDocument;
  return (node == null || (_node$ownerDocument = node.ownerDocument) == null ? void 0 : _node$ownerDocument.defaultView) || window;
}
function getDocumentElement(node) {
  var _ref;
  return (_ref = (isNode(node) ? node.ownerDocument : node.document) || window.document) == null ? void 0 : _ref.documentElement;
}
function isNode(value) {
  if (!hasWindow()) {
    return false;
  }
  return value instanceof Node || value instanceof getWindow(value).Node;
}
function isElement(value) {
  if (!hasWindow()) {
    return false;
  }
  return value instanceof Element || value instanceof getWindow(value).Element;
}
function isHTMLElement(value) {
  if (!hasWindow()) {
    return false;
  }
  return value instanceof HTMLElement || value instanceof getWindow(value).HTMLElement;
}
function isShadowRoot(value) {
  if (!hasWindow() || typeof ShadowRoot === 'undefined') {
    return false;
  }
  return value instanceof ShadowRoot || value instanceof getWindow(value).ShadowRoot;
}
function isOverflowElement(element) {
  const {
    overflow,
    overflowX,
    overflowY,
    display
  } = getComputedStyle(element);
  return /auto|scroll|overlay|hidden|clip/.test(overflow + overflowY + overflowX) && !['inline', 'contents'].includes(display);
}
function isTableElement(element) {
  return ['table', 'td', 'th'].includes(getNodeName(element));
}
function isTopLayer(element) {
  return [':popover-open', ':modal'].some(selector => {
    try {
      return element.matches(selector);
    } catch (e) {
      return false;
    }
  });
}
function isContainingBlock(elementOrCss) {
  const webkit = isWebKit();
  const css = isElement(elementOrCss) ? getComputedStyle(elementOrCss) : elementOrCss;

  // https://developer.mozilla.org/en-US/docs/Web/CSS/Containing_block#identifying_the_containing_block
  return css.transform !== 'none' || css.perspective !== 'none' || (css.containerType ? css.containerType !== 'normal' : false) || !webkit && (css.backdropFilter ? css.backdropFilter !== 'none' : false) || !webkit && (css.filter ? css.filter !== 'none' : false) || ['transform', 'perspective', 'filter'].some(value => (css.willChange || '').includes(value)) || ['paint', 'layout', 'strict', 'content'].some(value => (css.contain || '').includes(value));
}
function getContainingBlock(element) {
  let currentNode = getParentNode(element);
  while (isHTMLElement(currentNode) && !isLastTraversableNode(currentNode)) {
    if (isContainingBlock(currentNode)) {
      return currentNode;
    } else if (isTopLayer(currentNode)) {
      return null;
    }
    currentNode = getParentNode(currentNode);
  }
  return null;
}
function isWebKit() {
  if (typeof CSS === 'undefined' || !CSS.supports) return false;
  return CSS.supports('-webkit-backdrop-filter', 'none');
}
function isLastTraversableNode(node) {
  return ['html', 'body', '#document'].includes(getNodeName(node));
}
function getComputedStyle(element) {
  return getWindow(element).getComputedStyle(element);
}
function getNodeScroll(element) {
  if (isElement(element)) {
    return {
      scrollLeft: element.scrollLeft,
      scrollTop: element.scrollTop
    };
  }
  return {
    scrollLeft: element.scrollX,
    scrollTop: element.scrollY
  };
}
function getParentNode(node) {
  if (getNodeName(node) === 'html') {
    return node;
  }
  const result =
  // Step into the shadow DOM of the parent of a slotted node.
  node.assignedSlot ||
  // DOM Element detected.
  node.parentNode ||
  // ShadowRoot detected.
  isShadowRoot(node) && node.host ||
  // Fallback.
  getDocumentElement(node);
  return isShadowRoot(result) ? result.host : result;
}
function getNearestOverflowAncestor(node) {
  const parentNode = getParentNode(node);
  if (isLastTraversableNode(parentNode)) {
    return node.ownerDocument ? node.ownerDocument.body : node.body;
  }
  if (isHTMLElement(parentNode) && isOverflowElement(parentNode)) {
    return parentNode;
  }
  return getNearestOverflowAncestor(parentNode);
}
function getOverflowAncestors(node, list, traverseIframes) {
  var _node$ownerDocument2;
  if (list === void 0) {
    list = [];
  }
  if (traverseIframes === void 0) {
    traverseIframes = true;
  }
  const scrollableAncestor = getNearestOverflowAncestor(node);
  const isBody = scrollableAncestor === ((_node$ownerDocument2 = node.ownerDocument) == null ? void 0 : _node$ownerDocument2.body);
  const win = getWindow(scrollableAncestor);
  if (isBody) {
    const frameElement = getFrameElement(win);
    return list.concat(win, win.visualViewport || [], isOverflowElement(scrollableAncestor) ? scrollableAncestor : [], frameElement && traverseIframes ? getOverflowAncestors(frameElement) : []);
  }
  return list.concat(scrollableAncestor, getOverflowAncestors(scrollableAncestor, [], traverseIframes));
}
function getFrameElement(win) {
  return win.parent && Object.getPrototypeOf(win.parent) ? win.frameElement : null;
}

export { getComputedStyle, getContainingBlock, getDocumentElement, getFrameElement, getNearestOverflowAncestor, getNodeName, getNodeScroll, getOverflowAncestors, getParentNode, getWindow, isContainingBlock, isElement, isHTMLElement, isLastTraversableNode, isNode, isOverflowElement, isShadowRoot, isTableElement, isTopLayer, isWebKit };