Cannot define discriminator options on a Schema about mongoose HOT 1 OPEN

const mongoose = require('mongoose');

const eventSchema = new mongoose.Schema({
  name: String
});
const clickedEventSchema = new mongoose.Schema({ element: String }, { discriminatorKey: 'kind' });
eventSchema.discriminator('ClickedEvent', clickedEventSchema, { value: 'click' });
//                                                            ^ this will not be used
const Event = mongoose.model('Event', eventSchema);

const ClickedModel = mongoose.model('Clicked', clickedEventSchema);


async function run() {
  await mongoose.connect('mongodb://localhost:27017');
  await mongoose.connection.dropDatabase();
  const doc = await Event.create({ kind: 'clicked', element: '#hero' });
  doc.element; // '#hero'
  console.log(doc instanceof ClickedModel); // this should be `true`, this will currently be `false`
  console.log('done');
}

run();