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sample/prod/talk/bundle/popper-2.11.8/esm/dom-utils/instanceOf.js

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+import getWindow from "./getWindow.js";
+
+function isElement(node) {
+  var OwnElement = getWindow(node).Element;
+  return node instanceof OwnElement || node instanceof Element;
+}
+
+function isHTMLElement(node) {
+  var OwnElement = getWindow(node).HTMLElement;
+  return node instanceof OwnElement || node instanceof HTMLElement;
+}
+
+function isShadowRoot(node) {
+  // IE 11 has no ShadowRoot
+  if (typeof ShadowRoot === 'undefined') {
+    return false;
+  }
+
+  var OwnElement = getWindow(node).ShadowRoot;
+  return node instanceof OwnElement || node instanceof ShadowRoot;
+}
+
+export { isElement, isHTMLElement, isShadowRoot };