addFeature(feature, projectionTransform) {
    let geometry = feature.getGeometry();
    if (!geometry) {
      return;
    }
    if (projectionTransform) {
      geometry = geometry.clone();
      geometry.applyTransform(projectionTransform);
    }
    this.addGeometry_(geometry, feature);
  }
@param {Feature|RenderFeature} feature Feature to add to the batch
@param {import("../../proj.js").TransformFunction} [projectionTransform] Projection transform.