How to use the mongodb-core.Logger function in mongodb-core

options.promiseLibrary = promiseLibrary;

  // var self = this;  // Internal state of the db object
  this.s = {
    // Database name
      databaseName: databaseName
    // DbCache
    , dbCache: {}
    // Children db's
    , children: []
    // Topology
    , topology: topology
    // Options
    , options: options
    // Logger instance
    , logger: Logger('Db', options)
    // Get the bson parser
    , bson: topology ? topology.bson : null
    // Authsource if any
    , authSource: options.authSource
    // Unpack read preference
    , readPreference: options.readPreference
    // Set buffermaxEntries
    , bufferMaxEntries: typeof options.bufferMaxEntries == 'number' ? options.bufferMaxEntries : -1
    // Parent db (if chained)
    , parentDb: options.parentDb || null
    // Set up the primary key factory or fallback to ObjectID
    , pkFactory: options.pkFactory || ObjectID
    // Get native parser
    , nativeParser: options.nativeParser || options.native_parser
    // Promise library
    , promiseLibrary: promiseLibrary

options.promiseLibrary = promiseLibrary;

  // var self = this;  // Internal state of the db object
  this.s = {
    // Database name
      databaseName: databaseName
    // DbCache
    , dbCache: {}
    // Children db's
    , children: []
    // Topology
    , topology: topology
    // Options
    , options: options
    // Logger instance
    , logger: Logger('Db', options)
    // Get the bson parser
    , bson: topology ? topology.bson : null
    // Authsource if any
    , authSource: options.authSource
    // Unpack read preference
    , readPreference: options.readPreference
    // Set buffermaxEntries
    , bufferMaxEntries: typeof options.bufferMaxEntries == 'number' ? options.bufferMaxEntries : -1
    // Parent db (if chained)
    , parentDb: options.parentDb || null
    // Set up the primary key factory or fallback to ObjectID
    , pkFactory: options.pkFactory || ObjectID
    // Get native parser
    , nativeParser: options.nativeParser || options.native_parser
    // Promise library
    , promiseLibrary: promiseLibrary

var connect = function(self, url, options, callback) {
  options = options || {};
  options = shallowClone(options);

  // If callback is null throw an exception
  if(callback == null) {
    throw new Error("no callback function provided");
  }

  // Get a logger for MongoClient
  var logger = Logger('MongoClient', options);

  // Parse the string
  var object = parse(url, options);
  var _finalOptions = createUnifiedOptions({}, object);
  _finalOptions = mergeOptions(_finalOptions, object, false);
  _finalOptions = createUnifiedOptions(_finalOptions, options);

  // Check if we have connection and socket timeout set
  if(_finalOptions.socketTimeoutMS == null) _finalOptions.socketTimeoutMS = 360000;
  if(_finalOptions.connectTimeoutMS == null) _finalOptions.connectTimeoutMS = 30000;

  if (_finalOptions.db_options && _finalOptions.db_options.auth) {
    delete _finalOptions.db_options.auth;
  }

  // Failure modes

options.promiseLibrary = promiseLibrary;

  // var self = this;  // Internal state of the db object
  this.s = {
    // Database name
      databaseName: databaseName
    // DbCache
    , dbCache: {}
    // Children db's
    , children: []
    // Topology
    , topology: topology
    // Options
    , options: options
    // Logger instance
    , logger: Logger('Db', options)
    // Get the bson parser
    , bson: topology ? topology.bson : null
    // Authsource if any
    , authSource: options.authSource
    // Unpack read preference
    , readPreference: options.readPreference
    // Set buffermaxEntries
    , bufferMaxEntries: typeof options.bufferMaxEntries == 'number' ? options.bufferMaxEntries : -1
    // Parent db (if chained)
    , parentDb: options.parentDb || null
    // Set up the primary key factory or fallback to ObjectID
    , pkFactory: options.pkFactory || ObjectID
    // Get native parser
    , nativeParser: options.nativeParser || options.native_parser
    // Promise library
    , promiseLibrary: promiseLibrary

var connect = function(self, url, options, callback) {
  options = options || {};
  options = shallowClone(options);

  // If callback is null throw an exception
  if(callback == null) {
    throw new Error("no callback function provided");
  }

  // Get a logger for MongoClient
  var logger = Logger('MongoClient', options);

  // Parse the string
  var object = parse(url, options);
  var _finalOptions = createUnifiedOptions({}, object);
  _finalOptions = mergeOptions(_finalOptions, object, false);
  _finalOptions = createUnifiedOptions(_finalOptions, options);

  // Check if we have connection and socket timeout set
  if(_finalOptions.socketTimeoutMS == null) _finalOptions.socketTimeoutMS = 30000;
  if(_finalOptions.connectTimeoutMS == null) _finalOptions.connectTimeoutMS = 30000;

  // Failure modes
  if(object.servers.length == 0) {
    throw new Error("connection string must contain at least one seed host");
  }

options.promiseLibrary = promiseLibrary;

  // var self = this;  // Internal state of the db object
  this.s = {
    // Database name
      databaseName: databaseName
    // DbCache
    , dbCache: {}
    // Children db's
    , children: []
    // Topology
    , topology: topology
    // Options
    , options: options
    // Logger instance
    , logger: Logger('Db', options)
    // Get the bson parser
    , bson: topology ? topology.bson : null
    // Authsource if any
    , authSource: options.authSource
    // Unpack read preference
    , readPreference: options.readPreference
    // Set buffermaxEntries
    , bufferMaxEntries: typeof options.bufferMaxEntries == 'number' ? options.bufferMaxEntries : -1
    // Parent db (if chained)
    , parentDb: options.parentDb || null
    // Set up the primary key factory or fallback to ObjectID
    , pkFactory: options.pkFactory || ObjectID
    // Get native parser
    , nativeParser: options.nativeParser || options.native_parser
    // Promise library
    , promiseLibrary: promiseLibrary

var connect = function(url, options, callback) {
  options = options || {};
  options = shallowClone(options);

  // If callback is null throw an exception
  if(callback == null) {
    throw new Error("no callback function provided");
  }

  // Get a logger for MongoClient
  var logger = Logger('MongoClient', options);

  // Parse the string
  var object = parse(url, options);
  var _finalOptions = createUnifiedOptions({}, object);
  _finalOptions = mergeOptions(_finalOptions, object, false);
  _finalOptions = createUnifiedOptions(_finalOptions, options);

  // Check if we have connection and socket timeout set
  if(_finalOptions.socketTimeoutMS == null) _finalOptions.socketTimeoutMS = 30000;
  if(_finalOptions.connectTimeoutMS == null) _finalOptions.connectTimeoutMS = 30000;

  // Failure modes
  if(object.servers.length == 0) {
    throw new Error("connection string must contain at least one seed host");
  }

options.promiseLibrary = promiseLibrary;

  // var self = this;  // Internal state of the db object
  this.s = {
    // Database name
      databaseName: databaseName
    // DbCache
    , dbCache: {}
    // Children db's
    , children: []
    // Topology
    , topology: topology
    // Options
    , options: options
    // Logger instance
    , logger: Logger('Db', options)
    // Get the bson parser
    , bson: topology ? topology.bson : null
    // Authsource if any
    , authSource: options.authSource
    // Unpack read preference
    , readPreference: options.readPreference
    // Set buffermaxEntries
    , bufferMaxEntries: typeof options.bufferMaxEntries == 'number' ? options.bufferMaxEntries : -1
    // Parent db (if chained)
    , parentDb: options.parentDb || null
    // Set up the primary key factory or fallback to ObjectID
    , pkFactory: options.pkFactory || ObjectID
    // Get native parser
    , nativeParser: options.nativeParser || options.native_parser
    // Promise library
    , promiseLibrary: promiseLibrary

options.promiseLibrary = promiseLibrary;

  // Internal state of the db object
  this.s = {
    // Database name
    databaseName: databaseName,
    // DbCache
    dbCache: {},
    // Children db's
    children: [],
    // Topology
    topology: topology,
    // Options
    options: options,
    // Logger instance
    logger: Logger('Db', options),
    // Get the bson parser
    bson: topology ? topology.bson : null,
    // Unpack read preference
    readPreference: options.readPreference,
    // Set buffermaxEntries
    bufferMaxEntries: typeof options.bufferMaxEntries === 'number' ? options.bufferMaxEntries : -1,
    // Parent db (if chained)
    parentDb: options.parentDb || null,
    // Set up the primary key factory or fallback to ObjectID
    pkFactory: options.pkFactory || ObjectID,
    // Get native parser
    nativeParser: options.nativeParser || options.native_parser,
    // Promise library
    promiseLibrary: promiseLibrary,
    // No listener
    noListener: typeof options.noListener === 'boolean' ? options.noListener : false,