transform.js

const transformContact = (contact) => {
  const obj = {};
  [
    Contacts.Fields.Name,
    Contacts.Fields.Nickname,
    Contacts.Fields.MaidenName,
  ].forEach((fieldName) => {
    if (contact[fieldName]) obj[fieldName] = contact[fieldName];
  });
  
  if (contact[Contacts.Fields.Emails])
    obj[Contacts.Fields.Emails] = transformEmails(
      contact[Contacts.Fields.Emails],
    );
  
  if (contact[Contacts.Fields.PhoneNumbers])
    obj[Contacts.Fields.PhoneNumbers] = transformPhoneNumbers(
      contact[Contacts.Fields.PhoneNumbers],
    );
  return obj;
};