How to use the @zendeskgarden/container-utilities.KEY_CODES.BACKSPACE function in @zendeskgarden/container-utilities

onKeyDown: (e: KeyboardEvent) => {
                  if (!inputValue) {
                    if (isRtl(props) && e.keyCode === KEY_CODES.RIGHT && selectedItems.length > 0) {
                      setFocusedItem(selectedItems[selectedItems.length - 1]);
                    } else if (
                      !isRtl(props) &&
                      e.keyCode === KEY_CODES.LEFT &&
                      selectedItems.length > 0
                    ) {
                      setFocusedItem(selectedItems[selectedItems.length - 1]);
                    } else if (e.keyCode === KEY_CODES.BACKSPACE && selectedItems.length > 0) {
                      (setDownshiftState as any)({
                        type: REMOVE_ITEM_STATE_TYPE,
                        selectedItem: selectedItems[selectedItems.length - 1]
                      });
                      (e as any).nativeEvent.preventDownshiftDefault = true;
                      e.preventDefault();
                      e.stopPropagation();
                    }
                  }
                },
                isVisible: isFocused || inputValue || selectedItems.length === 0,