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'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');};