Argument of type '{ from: string; to: string; }' is not assignable to parameter of type 'string | Date'. in enabling dates in flatpickr

I am trying to enable dates in flatpickr calender which is integrated with angular. So when I am trying to push enable date object to enable config option of flatpickr then I am getting Argument of type '{ from: string; to: string; }' is not assignable to parameter of type 'string | Date'.

Here is the code for config. of flatpickr:-

      dateFormat: "d.m.Y",
      minDate: "today",
      maxDate: "",
      onChange: function (selectedDates, dateStr) {
        // console.log('selected date is ', selectedDates);
        console.log('latest selected dates ', dateStr);
        this.selectedDate = selectedDates;
        this.dateSelected = selectedDates;
        console.log('this.dateSelected ', this.dateSelected);
        console.log('this.selectedDate ', this.selectedDates);
      }
    };```

In a function I am using that config object to enable dates:-

``` allAboutDateAndTime(){
    if (this.experienceData.dateRangeList != null && this.experienceData.dateRangeList != undefined && this.experienceData.dateRangeList.length > 0) {
      this.experienceData.dateRangeList.forEach((date: DateRange) => {
        const from = date.startDate.toString();
        const to = date.endDate.toString();
        const enable = {
          from: from,
          to: to
        };
        this.exampleOptions.enable.push(enable); // GETTING ERROR HERE
      });
    }```

This is the error I am getting ```Argument of type '{ from: string; to: string; }' is not assignable to parameter of type 'string | Date'.
  Type '{ from: string; to: string; }' is missing the following properties from type 'Date': toDateString, toTimeString, toLocaleDateString, toLocaleTimeString, and 38 more```

I am expecting it to enable the assigned dates as given in flatpickr [documentaion](https://flatpickr.js.org/examples/)