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

const applyWriteConcern = require('../utils').applyWriteConcern;
const ObjectID = require('mongodb-core').BSON.ObjectID;
const BSON = require('mongodb-core').BSON;

// Error codes
const UNKNOWN_ERROR = 8;
const INVALID_BSON_ERROR = 22;
const WRITE_CONCERN_ERROR = 64;
const MULTIPLE_ERROR = 65;

// Insert types
const INSERT = 1;
const UPDATE = 2;
const REMOVE = 3;

const bson = new BSON([
  BSON.Binary,
  BSON.Code,
  BSON.DBRef,
  BSON.Decimal128,
  BSON.Double,
  BSON.Int32,
  BSON.Long,
  BSON.Map,
  BSON.MaxKey,
  BSON.MinKey,
  BSON.ObjectId,
  BSON.BSONRegExp,
  BSON.Symbol,
  BSON.Timestamp
]);

const toError = require('../utils').toError;
const handleCallback = require('../utils').handleCallback;
const applyRetryableWrites = require('../utils').applyRetryableWrites;
const applyWriteConcern = require('../utils').applyWriteConcern;
const executeOperation = require('../utils').executeOperation;
const isPromiseLike = require('../utils').isPromiseLike;

// Error codes
const WRITE_CONCERN_ERROR = 64;

// Insert types
const INSERT = 1;
const UPDATE = 2;
const REMOVE = 3;

const bson = new BSON([
  BSON.Binary,
  BSON.Code,
  BSON.DBRef,
  BSON.Decimal128,
  BSON.Double,
  BSON.Int32,
  BSON.Long,
  BSON.Map,
  BSON.MaxKey,
  BSON.MinKey,
  BSON.ObjectId,
  BSON.BSONRegExp,
  BSON.Symbol,
  BSON.Timestamp
]);

var common = require('./common'),
  utils = require('../utils'),
  toError = require('../utils').toError,
  handleCallback = require('../utils').handleCallback,
  shallowClone = utils.shallowClone,
  BulkWriteResult = common.BulkWriteResult,
  ObjectID = require('mongodb-core').BSON.ObjectID,
  Define = require('../metadata'),
  BSON = require('mongodb-core').BSON,
  Batch = common.Batch,
  mergeBatchResults = common.mergeBatchResults,
  executeOperation = require('../utils').executeOperation,
  BulkWriteError = require('./common').BulkWriteError;

var bson = new BSON([
  BSON.Binary,
  BSON.Code,
  BSON.DBRef,
  BSON.Decimal128,
  BSON.Double,
  BSON.Int32,
  BSON.Long,
  BSON.Map,
  BSON.MaxKey,
  BSON.MinKey,
  BSON.ObjectId,
  BSON.BSONRegExp,
  BSON.Symbol,
  BSON.Timestamp
]);

const utils = require('../utils');
const toError = require('../utils').toError;
const handleCallback = require('../utils').handleCallback;
const shallowClone = utils.shallowClone;
const BulkWriteResult = common.BulkWriteResult;
const ObjectID = require('mongodb-core').BSON.ObjectID;
const BSON = require('mongodb-core').BSON;
const Batch = common.Batch;
const mergeBatchResults = common.mergeBatchResults;
const executeOperation = utils.executeOperation;
const BulkWriteError = require('./common').BulkWriteError;
const applyWriteConcern = utils.applyWriteConcern;
const MongoWriteConcernError = require('mongodb-core').MongoWriteConcernError;
const handleMongoWriteConcernError = require('./common').handleMongoWriteConcernError;

var bson = new BSON([
  BSON.Binary,
  BSON.Code,
  BSON.DBRef,
  BSON.Decimal128,
  BSON.Double,
  BSON.Int32,
  BSON.Long,
  BSON.Map,
  BSON.MaxKey,
  BSON.MinKey,
  BSON.ObjectId,
  BSON.BSONRegExp,
  BSON.Symbol,
  BSON.Timestamp
]);

const utils = require('../utils');
const toError = require('../utils').toError;
const handleCallback = require('../utils').handleCallback;
const shallowClone = utils.shallowClone;
const BulkWriteResult = common.BulkWriteResult;
const ObjectID = require('mongodb-core').BSON.ObjectID;
const BSON = require('mongodb-core').BSON;
const Batch = common.Batch;
const mergeBatchResults = common.mergeBatchResults;
const executeOperation = utils.executeOperation;
const BulkWriteError = require('./common').BulkWriteError;
const applyWriteConcern = utils.applyWriteConcern;
const MongoWriteConcernError = require('mongodb-core').MongoWriteConcernError;
const handleMongoWriteConcernError = require('./common').handleMongoWriteConcernError;

var bson = new BSON([
  BSON.Binary,
  BSON.Code,
  BSON.DBRef,
  BSON.Decimal128,
  BSON.Double,
  BSON.Int32,
  BSON.Long,
  BSON.Map,
  BSON.MaxKey,
  BSON.MinKey,
  BSON.ObjectId,
  BSON.BSONRegExp,
  BSON.Symbol,
  BSON.Timestamp
]);