NewClient creates a new instance of the Firebase Database Client.

Client is the interface for the Firebase Realtime Database service.

Query represents a complex query that can be executed on a Ref.

Ref represents a node in the Firebase Realtime Database.

QueryNode represents a data node retrieved from an ordered query.

TransactionNode represents the value of a node within the scope of a transaction.

UpdateFn represents a function type that can be passed into Transaction().