Meteor Session similar in ES2015

es2015_meteor_session.js

SessionHandler = {
  _deps: new Tracker.Dependency,
  get(target, name){
    this._deps.depend();
    
    return target[name];
  },
  set(target, name, value){
    target[name] = value;
    this._deps.changed();
  }
}

Session = new Proxy({}, SessionHandler);