Extra fields in sign up

const emailDataSchema = z.object({
  email: z.string(),
  fullname: z.string(),
})

export const getEmailUserFields = defineUserSignupFields({
  email: data => {
    const emailData = emailDataSchema.parse(data)
    return emailData.email
  },
  username: data => {
    const emailData = emailDataSchema.parse(data)
    return emailData.email
  },
  isAdmin: data => {
    const emailData = emailDataSchema.parse(data)
    return adminEmails.includes(emailData.email)
  },
  fullname: data => {
    const emailData = emailDataSchema.parse(data)
    return emailData.fullname
  },
})

const signupSchema = z
  .object({
    fullname: z.string().min(1, 'Name is required'),
    email: z
      .string()
      .min(1, 'Email is required')
      .email('Please enter a valid email'),
    password: z
      .string()
      .min(1, 'Password is required')
      .min(8, 'Password must be at least 8 characters'),
    confirmPassword: z.string().min(1, 'Please confirm your password'),
  })
  .refine(data => data.password === data.confirmPassword, {
    message: 'Passwords do not match',
    path: ['confirmPassword'],
  })

export function Signup() {
  const [showLinkSentView, setShowLinkSentView] = useState<boolean>(false)
  const [signupError, setSignupError] = useState<Error | null>(null)
  const {
    formData,
    errors,
    isSubmitting,
    showPassword,
    changeShowPassword,
    handleInputChange,
    handleSubmit,
  } = useFormHandler(signupSchema, async data => {
    setSignupError(null)
    try {
      await signup({ email: data.email, password: data.password })
      setShowLinkSentView(true)
    } catch (error: unknown) {
      setSignupError(error as Error)
    }
  })