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Cannot call addListener when using a ES2015 class as schema

See original GitHub issue

Goals

Use a class as schema (as shown per https://realm.io/docs/javascript/latest/#classes) and be able to use objects the same manner as if the schema was defined as an object.

Expected Results

Be able to call .addListener on an object that is a result of realm.create or realm.objects when the schema was defined using a ES2015 class.

Actual Results

ExceptionsManager.js:86 person.addListener is not a function
handleException @ ExceptionsManager.js:86
handleError @ setUpErrorHandling.js:23
reportFatalError @ error-guard.js:42
guardedLoadModule @ require.js:197
metroRequire @ require.js:122
(anonymous) @ RealmTest2.js:33
executeApplicationScript @ debuggerWorker.js:40
(anonymous) @ debuggerWorker.js:72
RCTLog.js:47 Running application Tripps ({
    initialProps =     {
    };
    rootTag = 11;
})

Code Sample

import Realm from "realm"

class Person {
  get fullName() {
    return this.firstName + " " + this.lastName
  }
}

Person.schema = {
  name: "Person",
  properties: {
    firstName: "string",
    lastName: "string",
  },
}

const realm = new Realm({
  path: "realm-test.realm",
  schema: [Person],
})

realm.write(() => {
  realm.create(Person.schema.name, {
    firstName: "John",
    lastName: "Smith",
  })
})

const persons = realm.objects(Person.schema.name)
const person = persons[persons.length - 1]
console.log(person.fullName)

person.addListener(obj => { // Error: person.addListener is not a function
  if (obj) {
    console.log("Changes Found! " + obj.fullName)
  }
})