validator.js

const event = {
  domain: User,
  eventName: UserCreatedSuccess,
  eventData: {
    username: 'newUserName',
    email: 'test@test.com',
    originalImageUrl: 'some url',
  }
};
const { schemas, supportedEvents
} = await loadRegistry();

// Step 1: check if event domain is defined and event is defined in it
const supportedEventStatus = supportedEvents[event.domain
][event.eventName
];
if (supportedEventStatus === undefined) {
  // oops, event is not defined. Throw error
  throw new Error('event is not defined in the registry');
}
// if you sent the schema over the wire using describe, recreate a joi object
const joiSchema = Joi.build(schemas[event.domain
][event.eventName
]);
const { error
} = joiSchema.validate(event);
if (error === undefined) {
  // event is valid, raise the event
} else {
  // event is invalid. raise error
}