How to use the h3-js.h3SetToMultiPolygon function in h3-js

function h3SetToFeature(hexagons, properties = {}) {
    const polygons = h3.h3SetToMultiPolygon(hexagons, true);
    // See if we can unwrap to a simple Polygon.
    const isMultiPolygon = polygons.length > 1;
    const type = isMultiPolygon ? MULTI_POLYGON : POLYGON;
    // MultiPolygon, single polygon, or empty array for an empty hex set
    const coordinates = isMultiPolygon ? polygons : polygons[0] || [];
    return {
        type: FEATURE,
        properties,
        geometry: {
            type,
            coordinates
        }
    };
}

updateState({props, oldProps, changeFlags}) {
    if (
      changeFlags.dataChanged ||
      (changeFlags.updateTriggers && changeFlags.updateTriggers.getHexagons)
    ) {
      const {data, getHexagons} = props;
      const polygons = [];

      const {iterable, objectInfo} = createIterable(data);
      for (const object of iterable) {
        objectInfo.index++;
        const hexagons = getHexagons(object, objectInfo);
        const multiPolygon = h3SetToMultiPolygon(hexagons, true);

        for (const polygon of multiPolygon) {
          polygons.push(this.getSubLayerRow({polygon}, object, objectInfo.index));
        }
      }

      this.setState({polygons});
    }
  }