Node warnings

[W01fw00d]

Issues that appears on console while running the backend server:

(node:14444) Warning: Accessing non-existent property 'count' of module exports inside circular dependency
(Use node --trace-warnings ... to show where the warning was created)
(node:14444) Warning: Accessing non-existent property 'findOne' of module exports inside circular dependency
(node:14444) Warning: Accessing non-existent property 'remove' of module exports inside circular dependency
(node:14444) Warning: Accessing non-existent property 'updateOne' of module exports inside circular dependency
(node:14444) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
(node:14444) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
(node:14444) DeprecationWarning: collection.remove is deprecated. Use deleteOne, deleteMany, or bulkWrite instead.