etl.js

/**
 * ETL function to gather all person type contacts from device
 * @returns {Promise<{ name: string, nickname: string, maidenName: string, phoneNumbers: string[], emails: string[] }[]>} An promise resolved to an array of 0 or more transformed contacts
 */
export const extractAndTransformContacts = async () =>
  Contacts.getContactsAsync({
    fields: QUERY_FIELDS,
    pageSize: 0,
  }).then(({ data }) => {
    const transformedContacts = produceContacts(data);
    console.log('all contacts:', transformedContacts);
    return transformedContacts;
  });