How to use the @here/harp-utils.mergeWithOptions function in @here/harp-utils

mapView = new MapView({
            canvas,
            theme: options.theme,
            preserveDrawingBuffer: true,
            pixelRatio: 1
        });

        const defaultLookAt: LookAtParams = {
            latitute: 53.3,
            longitude: 14.6,
            distance: 200000,
            tilt: 0,
            azimuth: 0
        };

        const lookAt = mergeWithOptions(defaultLookAt, options.lookAt);

        mapView.lookAt(
            new GeoCoordinates(lookAt.latitute, lookAt.longitude),
            lookAt.distance,
            lookAt.tilt,
            lookAt.azimuth
        );
        // Shutdown errors cause by firefox bug
        mapView.renderer.getContext().getShaderInfoLog = (x: any) => {
            return "";
        };

        const geoJsonDataSource = new OmvDataSource({
            decoder: new OmvTileDecoder(),
            dataProvider: new GeoJsonDataProvider(
                "geojson",