How to use the @turf/points-within-polygon.default function in @turf/points-within-polygon

vertices.features.push({
            type: "Feature",
            properties: {},
            geometry: {
                type: "Point",
                coordinates: [diagram.vertices[i].x, diagram.vertices[i].y]
            }
        })
    }
    vertices.features.push(centroid(polygon));
    //within requires a FeatureCollection for input polygons
    const polygonFeatureCollection = {
        type: "FeatureCollection",
        features: [polygon]
    };
    const ptsWithin = within(vertices, polygonFeatureCollection); //remove any vertices that are not inside the polygon
    if(ptsWithin.features.length === 0) {
        throw new NoPointsInShapeError('Neither the centroid nor any Voronoi vertices intersect the shape.');
    }
    const labelLocation = {
        coordinates: [0,0],
        maxDist: 0
    };
    const polygonBoundaries = {
        type: "FeatureCollection",
        features: []
    };
    let vertexDistance;

    //define borders of polygon and holes as LineStrings
    for(let j = 0; j < polygon.geometry.coordinates.length; j++) {
        polygonBoundaries.features.push({