Class BulkOperationBase

const bulkOp = collection.initializeOrderedBulkOp();

// Add an updateOne to the bulkOp
bulkOp.find({ a: 1 }).updateOne({ $set: { b: 2 } });

// Add an updateMany to the bulkOp
bulkOp.find({ c: 3 }).update({ $set: { d: 4 } });

// Add an upsert
bulkOp.find({ e: 5 }).upsert().updateOne({ $set: { f: 6 } });

// Add a deletion
bulkOp.find({ g: 7 }).deleteOne();

// Add a multi deletion
bulkOp.find({ h: 8 }).delete();

// Add a replaceOne
bulkOp.find({ i: 9 }).replaceOne({writeConcern: { j: 10 }});

// Update using a pipeline (requires Mongodb 4.2 or higher)
bulk.find({ k: 11, y: { $exists: true }, z: { $exists: true } }).updateOne([
  { $set: { total: { $sum: [ '$y', '$z' ] } } }
]);

// All of the ops will now be executed
await bulkOp.execute();

const bulkOp = collection.initializeOrderedBulkOp();

// Adds three inserts to the bulkOp.
bulkOp
  .insert({ a: 1 })
  .insert({ b: 2 })
  .insert({ c: 3 });
await bulkOp.execute();