How to watch object changes with rxjs 5

I would like to watch over an object, so all the subscribers will be informed for any changes of it.

I saw it already been asked before, yet the answer is irrelevant since RXjs verion 5 do not include the ofObjectChanges in it's API anymore.

I've looked at some "hacks" like creating an observer which return a function:

let myObservable =  new Observable((observer) => {
  return (data) => {
    observer.next(data)
  }
}) 
//...
myObservable.subscribe()('someData')

However, I'm sure there is more elegant way of doing it. Any Ideas?