code: function observeOn(scheduler, delay) {
      if (delay === void 0) {
          delay = 0;
      }
      return function observeOnOperatorFunction(source) {
          return source.lift(new ObserveOnOperator(scheduler, delay));
      };
  }
docs: PURE_IMPORTS_START tslib,_Subscriber,_Notification PURE_IMPORTS_END