How to use the @here/harp-mapview.Tile function in @here/harp-mapview

getTile(tileKey: TileKey): Tile | undefined {
            // Create a new tile.
            const tile = new Tile(this, tileKey);

            // add a red circle
            tile.objects.push(new THREE.Mesh(this.geometry, this.material));

            // and finally return it
            return tile;
        }
        // end:vislib_datasource_hello_5.ts

getTile(tileKey: TileKey): Tile {
        const tile = new Tile(this, tileKey);

        const column = tileKey.column;
        const row = tileKey.row;
        const level = tileKey.level;
        const { appId, appCode } = this.m_options;
        const quadKey = tileKey.toQuadKey();
        const server = parseInt(quadKey[quadKey.length - 1], 10) + 1;
        let url =
            `https://${server}.${this.m_tileBaseAddress}/` +
            `${level}/${column}/${row}/${this.m_resolution}/png8` +
            `?app_id=${appId}&app_code=${appCode}` +
            getOptionValue(this.m_options.additionalRequestParameters, "");

        if (this.m_ppi !== WebTileDataSource.ppiValue.ppi72) {
            // because ppi=72 is default, we do not include it in the request
            url += `&ppi=${this.m_ppi}`;

getTile(tileKey: TileKey): Tile | undefined {
            // Create a new tile.
            const tile = new Tile(this, tileKey);

            // Add a THREE.Mesh created from the geometry and material factories
            tile.objects.push(
                new THREE.Mesh(
                    this.createGeometry(tile.boundingBox.clone(), tile.center),
                    this.createMaterial(tile.tileKey)
                )
            );

            return tile;
        }
        // end:vislib_datasource_simple_5.ts

getTile(tileKey: TileKey): Tile | undefined {
        return new Tile(this, tileKey);
    }
}