func configure(with viewModel: ViewModelType) {

        emailTextfield.rx.text.asObservable()
            .ignoreNil()
            .subscribe(viewModel.input.email)
            .disposed(by: disposeBag)

        passwordTextfield.rx.text.asObservable()
            .ignoreNil()
            .subscribe(viewModel.input.password)
            .disposed(by: disposeBag)

        signInButton.rx.tap.asObservable()
            .subscribe(viewModel.input.signInDidTap)
            .disposed(by: disposeBag)

        viewModel.output.errorsObservable
            .subscribe(onNext: { [unowned self] (error) in
                self.presentError(error)
            })
            .disposed(by: disposeBag)

        viewModel.output.loginResultObservable
            .subscribe(onNext: { [unowned self] (user) in
                self.presentMessage("User successfully signed in")
            })
            .disposed(by: disposeBag)

    }