As of time of creation of this ticket the top of master is this commit . D:\workspace\mongodb-master>.\mongo.exe --eval "MongoRunner.dataPath = 'D:/Temp/Data/shell/'; MongoRunner.dataDir = 'D:/Temp/Data/shell/';" --shell --nodb {"t":{"$date":"2020-03-26T13:24:01.175Z"},"s":"I", "c":"NETWORK", "id":4648602,"ctx":"main","msg":"Implicit TCP FastOpen in use."} MongoDB shell version v0.0.0 type "help" for help D:/Temp/Data/shell/ > var st = new ShardingTest({config:1}); Starting new replica set __unknown_name__-rs0 ShardingTest starting replica set for shard: __unknown_name__-rs0 ReplSetTest starting set '__unknown_name__-rs0' ReplSetTest n is : 0 { "useHostName" : true, "oplogSize" : 16, "keyFile" : undefined, "port" : 20000, "replSet" : "__unknown_name__-rs0", "dbpath" : "$set-$node", "useHostname" : true, "shardsvr" : "", "pathOpts" : { "testName" : "__unknown_name__", "shard" : 0, "node" : 0, "set" : "__unknown_name__-rs0" }, "setParameter" : { "migrationLockAcquisitionMaxWaitMS" : 30000, "writePeriodicNoops" : false, "numInitialSyncConnectAttempts" : 60 }, "waitForConnect" : false, "restart" : undefined } ReplSetTest Starting.... Resetting db path 'D:/Temp/Data/shell/__unknown_name__-rs0-0' uncaught exception: TypeError: jsTest.options(...).setParameters is undefined : appendSetParameterArgs@src/mongo/shell/servers.js:1175:21 MongoRunner._startWithArgs@src/mongo/shell/servers.js:1327:16 MongoRunner.runMongod@src/mongo/shell/servers.js:866:18 ReplSetTest/this.start<@src/mongo/shell/replsettest.js:2822:20 _nodeParamToId/<@src/mongo/shell/replsettest.js:231:45 _nodeParamToSingleNode/<@src/mongo/shell/replsettest.js:250:45 ReplSetTest/this.startSetAsync@src/mongo/shell/replsettest.js:631:13 ShardingTest@src/mongo/shell/shardingtest.js:1318:53 @(shell):1:10