reactionsToObservable

  implicit class TextFieldOps(field: TextField) {

    /** Returns a stream of text field values entered in the given text field.
      *
      * @param field the text field
      * @return an observable with a stream of text field updates
      */
    def textValues: Observable[String] = Observable {
      observer => {
        val reaction: Reaction = {
          case ..
        }

        field subscribe reaction

        Subscription { /* do something on unsubscribe */ }
      }
    }

  }