diff --git a/lib/bulk/common.js b/lib/bulk/common.js
index <HASH>..<HASH> 100644
--- a/lib/bulk/common.js
+++ b/lib/bulk/common.js
@@ -13,10 +13,7 @@ const executeOperation = require('../utils').executeOperation;
 const isPromiseLike = require('../utils').isPromiseLike;
 
 // 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;
@@ -1145,20 +1142,8 @@ Object.defineProperty(BulkOperationBase.prototype, 'length', {
 module.exports = {
   Batch,
   BulkOperationBase,
-  BulkWriteError,
-  BulkWriteResult,
   bson,
-  FindOperators,
-  handleMongoWriteConcernError,
-  LegacyOp,
-  mergeBatchResults,
-  INVALID_BSON_ERROR: INVALID_BSON_ERROR,
-  MULTIPLE_ERROR: MULTIPLE_ERROR,
-  UNKNOWN_ERROR: UNKNOWN_ERROR,
-  WRITE_CONCERN_ERROR: WRITE_CONCERN_ERROR,
   INSERT: INSERT,
   UPDATE: UPDATE,
-  REMOVE: REMOVE,
-  WriteError,
-  WriteConcernError
+  REMOVE: REMOVE
 };
refactor(BulkOp): remove code that is not used