{
  // ...
  onSubmit: async ({ value, createValidationError }) => {
    const result = await saveUser(value)

    if (!result.ok) {
      return createValidationError(result.error)
    }
  },
}

createValidationError: CreateValidationErrorFn<TFormData>;

{
  // ...
  onSubmit: async ({ value, createValidationError }) => {
    const result = await saveUser(value)

    if (result.status === 409) {
      return createValidationError({
        form: 'A user with this email already exists',
        fields: {},
      })
    }
  },
}

formApi: FormApi<TFormData, TFormErrorTypes>;

parseIssues: ParseSubmitIssuesFn<TFormData>;

{
  // ...
  onSubmit: async ({ value, parseIssues }) => {
    const result = await saveUser(value)

    if (!result.ok) {
      return parseIssues(result.issues)
    }
  },
}

schemaOutputs: TSchemaOutputs;

{
  // ...
  onSubmit: async ({ schemaOutputs }) => {
    const validatedUser = schemaOutputs[0]
    await saveUser(validatedUser)
  },
}

value: TFormData;