Method doTransaction

packages/firebase-database/index.android.ts:513–517

(data: any)

				applyLocally,
				new org.nativescript.firebase.database.FirebaseDatabase.TransactionCallback({
					doTransaction(data: any): any {
						const newData = transactionUpdate(deserialize(data));
						// TODO improve
						return serializeItems(newData, true);
					},
					onComplete(error: com.google.firebase.database.DatabaseError, commited: boolean, snapshot: com.google.firebase.database.DataSnapshot): void {
						const ss = DataSnapshot.fromNative(snapshot);
						if (error) {