a

backend/node_modules/mongoose/lib/helpers/topology/allServersUnknown.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const getConstructorName = require('../getConstructorName');
+
+module.exports = function allServersUnknown(topologyDescription) {
+  if (getConstructorName(topologyDescription) !== 'TopologyDescription') {
+    return false;
+  }
+
+  const servers = Array.from(topologyDescription.servers.values());
+  return servers.length > 0 && servers.every(server => server.type === 'Unknown');
+};