How to use the @uifabric/variants.VariantThemeType.Neutral function in @uifabric/variants

const tempJSXList: JSX.Element[] = [];
      for (let i = 0; i < slotNames.length; i++) {
        let slot = slotNames[i];
        let currSlotJSX = semanticSlotWidget(currVariantSemanticSlots[slot as keyof ISemanticColors], mapping[slot]);
        tempJSXList.push(currSlotJSX);
      }
      return tempJSXList;
    } else {
      return [];
    }
  };

  let semanticSlotsNone = props.theme.semanticColors;
  slotNames = trimSemanticSlotsOrNames(Object.keys(semanticSlotsNone)) as ISlotNames;
  noneSlots = fillVariantSlotsList(VariantThemeType.None);
  neutralSlots = fillVariantSlotsList(VariantThemeType.Neutral);
  softSlots = fillVariantSlotsList(VariantThemeType.Soft);
  strongSlots = fillVariantSlotsList(VariantThemeType.Strong);

  return (
    <div>
      
    </div>
  );
};