Relevant code for https://github.com/realm/realm-js/issues/1161#issuecomment-318772191

gistfile1.txt

'use strict'

const moment = require('moment');
const Realm = require('realm');

// these two lines were copied and pasted from the email sent me after registering for the free trial
var token = "***"; 
Realm.Sync.setAccessToken(token);

// TODO: make this admin key an environmental variable
const adminUser = Realm.Sync.User.adminUser('**');

const AppointmentSchema = {
    name: 'Appointment',
    primaryKey: 'id',
    properties: {
        id: 'string',
        phoneNumber: 'string',
        message: 'string',
        time: {type: 'date', indexed: true}
    }
};

// Appointment schema
class Appointment {
    static sendNotifications() {
        // set up realm. ********** IF USING THE REALM-JS LIB AND NOT realm-professional.tgz, IT FAILS HERE **************
        let appointmentRealm = new Realm({ 
            sync:  {
                user: adminUser, 
                url: "realm://***/appointments"
            }, 
            schema: [AppointmentSchema] 
        });
      
      // ...more irrelevant code below....
    }
}

Appointment.schema = AppointmentSchema;

module.exports = Appointment;