How to use the @commercetools-uikit/calendar-utils.parseInputToDate function in @commercetools-uikit/calendar-utils

onStateChange={changes => {
          /* eslint-disable no-prototype-builtins */
          if (changes.hasOwnProperty('inputValue')) {
            // input changed because user typed
            if (changes.type === Downshift.stateChangeTypes.changeInput) {
              const date = parseInputToDate(changes.inputValue, intl.locale);
              if (date === '') {
                setSuggestedItems([]);
                setHighlightedIndex(null);
              } else {
                setSuggestedItems([date]);
                setHighlightedIndex(getDateInMonth(date) - 1);
                setCalendarDate(date);
              }
            } else {
              // input changed because user selected a date
              setSuggestedItems([]);
              setHighlightedIndex(null);
            }
          }

          if (changes.hasOwnProperty('highlightedIndex')) {

.map(part => {
      const parsedDate = parseInputToDate(part.trim(), locale);
      return parsedDate === '' ? null : parsedDate;
    })
    .filter(Boolean);