input.graphql

enum UserTypes {
  SuperUser
  Administrator
  Customer
}

enum Gender {
  """
  Men
  """
  Male
  """
  Women
  """
  Female
  NonBinary
}

input Wrapper {
  foo: String
}

input GenderInput {
  """
  the check
  """
  check: Boolean!
  another: ID
  listOfStrings: [String]!
  nullableListOfStrings: [String]
  wrapper: Wrapper!
  gender: Gender
}

type User @bsRecord(type: "User.t") {
  name: String!
  email: String!
  gender: Gender
  listNullable: [String]
  list: [String]!
  getGender(
    """
    Do the check?
    """
    check: GenderInput
  ): Gender!
  self(check: Boolean!): User!
}

type Query {
  user: User
}

output.re

    type userTypes = [ | `SuperUser | `Administrator | `Customer]
    and gender = [
      | `Male /* Men */ /* Women */
      | `Female /* Men */ /* Women */
      | `NonBinary /* Men */ /* Women */
    ]
    and wrapper = {foo: option(string)}
    and genderInput = {
      /* the check */
      check: bool,
      another: option(string),
      listOfStrings: array(string),
      nullableListOfStrings: option(array(string)),
      wrapper,
      gender: option(gender),
    }
    and user = {
      name: string,
      email: string,
      gender: option(gender),
      listNullable: option(array(string)),
      list: array(string),
      getGender:
        /* Do the check? */
        (~check: option(genderInput)=?, unit) =>
        gender,
      self: (~check: bool, unit) => user,
    }
    and query = {user: option(user)};