api.js

const Prismic = require('prismic.io');

const endpoint = 'https://yourrepo.prismic.io/api';
const CMS = Prismic.api(endpoint);
const cursor = Prismic.Predicates;

class API {
  query(key, value) {
    return CMS.then((api) => {
      return api.query(cursor.at(key, value));
    }).then((response) => {
      return response;
    });
  }
  queryPaginated(key, value, page, pageSize) {
    return CMS.then((api) => {
      return api.query(cursor.at(key, value), { page: page, pageSize: pageSize });
    }).then((response) => {
      return response;
    });
  }
  queryIds(key, value) {
    return CMS.then((api) => {
      return api.query(cursor.in(key, value));
    }).then((response) => {
      return response;
    })
  }
}

export default API;