How to use the @here/harp-geoutils.webMercatorTilingScheme.getGeoBox function in @here/harp-geoutils

private processLineFeatures(
        data: ArrayBufferLike | {},
        tileKey: TileKey,
        styleSetEvaluator: StyleSetEvaluator,
        projection: Projection,
        geometries: Geometry[]
    ) {
        // Setup an environment for this "layer". This does normaly come from the data and should
        // contain all the attributes of a specific feature, so that it can be styled properly.
        const env = new MapEnv({ layer: "line-layer" });

        const techniques = styleSetEvaluator.getMatchingTechniques(env);

        const geoCenter = webMercatorTilingScheme.getGeoBox(tileKey).center;
        const worldCenter = projection.projectPoint(geoCenter, new Vector3());

        // Convert the input coordinates to local world coord coordinates (i.e. projected world
        // coordinates relative to the tile center in world coordinates)
        const worldPoints = this.convertToLocalWorldCoordinates(
            data,
            geoCenter,
            projection,
            worldCenter
        );

        // Create actual line-geometry out of the data.
        const lineGroup = new LineGroup();
        lineGroup.add(worldCenter, worldPoints);

        for (const technique of techniques) {

extendedTile,
            center,
            projection,
            styleSetEvaluator,
            buffers
        );

        const geometries: GeoJsonTileGeometries = {
            geometries: [],
            poiGeometries: [],
            textGeometries: [],
            textPathGeometries: []
        };

        const tileWorldBounds = new THREE.Box3();
        const geoBox = webMercatorTilingScheme.getGeoBox(extendedTile.info.tileKey);
        const tileBounds = projection.projectBox(geoBox, tileWorldBounds);
        const tileCenter = new THREE.Vector3();
        tileBounds.getCenter(tileCenter);
        const tileWorldExtents = tileWorldBounds.max.sub(tileCenter).x;

        buffers.geometryBuffer.forEach((geometryData, techniqueIndex) => {
            switch (geometryData.type) {
                case "point":
                    geometries.geometries.push(
                        this.createPointGeometry(geometryData, techniqueIndex)
                    );
                    break;
                case "solid-line":
                case "dashed-line":
                    geometries.geometries.push(
                        this.createSolidLineGeometry(geometryData, techniqueIndex)

private getTileCenter(tileKey: TileKey) {
        const geoBox = webMercatorTilingScheme.getGeoBox(tileKey);
        const tileBounds = this.m_projection.projectBox(geoBox, new OrientedBox3());
        return tileBounds.position;
    }