How to use the focus-lock.getFocusabledIn function in focus-lock

if (document && !lastActiveFocus && activeElement && !autoFocus) {
              activeElement.blur();
              document.body.focus();
            } else {
              result = moveFocusInside(workingArea, lastActiveFocus);
              lastPortaledElement = {};
            }
          }
          focusWasOutsideWindow = false;
          lastActiveFocus = document && document.activeElement;
        }
      }

      if (document) {
        const newActiveElement = document && document.activeElement;
        const allNodes = getFocusabledIn(workingArea);
        const focusedItem = allNodes.find(({ node }) => node === newActiveElement);
        if (focusedItem) {
          // remove old focus
          allNodes
            .filter(({ guard, node }) => guard && node.dataset.focusAutoGuard)
            .forEach(({ node }) => node.removeAttribute('tabIndex'));

          const focusedIndex = allNodes.indexOf(focusedItem);
          autoGuard(focusedIndex, allNodes.length, +1, allNodes);
          autoGuard(focusedIndex, -1, -1, allNodes);
        }
      }
    }
  }
  return result;
};