'use strict';
  
const mongodb = require('mongodb');

run().catch(error => console.log('Caught', error));

async function run() {
  const uri = 'mongodb://localhost:27017,localhost:27018,localhost:27019/test?replicaSet=rs';
  const client = await mongodb.MongoClient.connect(uri, { useNewUrlParser: true, useUnifiedTopology: true });
  console.log('Connected');
  
  await client.db().collection('test').findOne({});
  console.log('done');
}

$ node gh-8209-2.js 
Caught { Error: connect ECONNREFUSED 127.0.0.1:27019
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
  name: 'MongoNetworkError',
  errorLabels: [ 'TransientTransactionError' ],
  [Symbol(mongoErrorContextSymbol)]: {} }
^C
$ 

{
	"set" : "rs",
	"date" : ISODate("2019-10-07T20:02:58.119Z"),
	"myState" : 1,
	"term" : NumberLong(1),
	"syncingTo" : "",
	"syncSourceHost" : "",
	"syncSourceId" : -1,
	"heartbeatIntervalMillis" : NumberLong(2000),
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(1570478572, 1),
			"t" : NumberLong(1)
		},
		"readConcernMajorityOpTime" : {
			"ts" : Timestamp(1570478572, 1),
			"t" : NumberLong(1)
		},
		"appliedOpTime" : {
			"ts" : Timestamp(1570478572, 1),
			"t" : NumberLong(1)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1570478572, 1),
			"t" : NumberLong(1)
		}
	},
	"lastStableCheckpointTimestamp" : Timestamp(1570478542, 1),
	"members" : [
		{
			"_id" : 1,
			"name" : "localhost:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 51,
			"optime" : {
				"ts" : Timestamp(1570478572, 1),
				"t" : NumberLong(1)
			},
			"optimeDate" : ISODate("2019-10-07T20:02:52Z"),
			"syncingTo" : "",
			"syncSourceHost" : "",
			"syncSourceId" : -1,
			"infoMessage" : "could not find member to sync from",
			"electionTime" : Timestamp(1570478540, 1),
			"electionDate" : ISODate("2019-10-07T20:02:20Z"),
			"configVersion" : 1,
			"self" : true,
			"lastHeartbeatMessage" : ""
		},
		{
			"_id" : 2,
			"name" : "localhost:27018",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 47,
			"optime" : {
				"ts" : Timestamp(1570478572, 1),
				"t" : NumberLong(1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1570478572, 1),
				"t" : NumberLong(1)
			},
			"optimeDate" : ISODate("2019-10-07T20:02:52Z"),
			"optimeDurableDate" : ISODate("2019-10-07T20:02:52Z"),
			"lastHeartbeat" : ISODate("2019-10-07T20:02:56.458Z"),
			"lastHeartbeatRecv" : ISODate("2019-10-07T20:02:57.459Z"),
			"pingMs" : NumberLong(0),
			"lastHeartbeatMessage" : "",
			"syncingTo" : "localhost:27017",
			"syncSourceHost" : "localhost:27017",
			"syncSourceId" : 1,
			"infoMessage" : "",
			"configVersion" : 1
		},
		{
			"_id" : 3,
			"name" : "localhost:27019",
			"health" : 0,
			"state" : 8,
			"stateStr" : "(not reachable/healthy)",
			"uptime" : 0,
			"optime" : {
				"ts" : Timestamp(0, 0),
				"t" : NumberLong(-1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(0, 0),
				"t" : NumberLong(-1)
			},
			"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
			"optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"),
			"lastHeartbeat" : ISODate("2019-10-07T20:02:56.462Z"),
			"lastHeartbeatRecv" : ISODate("2019-10-07T20:02:53.455Z"),
			"pingMs" : NumberLong(0),
			"lastHeartbeatMessage" : "Error connecting to localhost:27019 (127.0.0.1:27019) :: caused by :: Connection refused",
			"syncingTo" : "",
			"syncSourceHost" : "",
			"syncSourceId" : -1,
			"infoMessage" : "",
			"configVersion" : -1
		}
	],
	"ok" : 1,
	"operationTime" : Timestamp(1570478572, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1570478572, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}