Example GraphQL implementation

authViewModel.swift

class AuthViewModel : BaseViewModel {
  
  func loginUser(email: String, password: String, completion: @escaping (_ success : Bool, _ error : NSError?) -> Void){
        Network.shared.apollo.perform(mutation: BundulAPI.LoginUserMutation(loginInput: NameOfAPI.LoginInput(email: email, password: password))) { result in
            switch result {
            case .success(let graphQLResult):
                print("Success! Result: \(graphQLResult)")
                completion(true, nil)
            case .failure(let error):
                print("Failure! Error: \\(error)")
                completion(false, error)
            }
        }
    }

}