[Nexus]

Пробовали так?

const emailFieldValidationScheme = Yup.string()
    .required('Required')
    .email('Invalid email address');

const ValidationScheme = Yup.object().shape({
  email: emailFieldValidationScheme,
  password: Yup.string()
    .required('Required'),
  code: Yup.number()
    .integer()
    .positive()
    .typeError('You must specify a number')
    .required('Required'),
});

emailFieldValidationScheme.validateSync('test');