@atlaskit/editor-common/dist/es2019/annotation/index.js

A package that contains common classes and components for editor and renderer

import { EventEmitter } from 'events';
export class AnnotationUpdateEmitter extends EventEmitter {
  on(event, listener) {
    return super.on(event, listener);
  }
  off(event, listener) {
    return super.removeListener(event, listener);
  }
}