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sample/dev/talk/bundle/popper-2.11.8/esm/utils/userAgent.js

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+export default function getUAString() {
+  var uaData = navigator.userAgentData;
+
+  if (uaData != null && uaData.brands && Array.isArray(uaData.brands)) {
+    return uaData.brands.map(function (item) {
+      return item.brand + "/" + item.version;
+    }).join(' ');
+  }
+
+  return navigator.userAgent;
+}