addFeatures(features, projectionTransform) {
    for (let i = 0; i < features.length; i++) {
      this.addFeature(features[i], projectionTransform);
    }
  }
@param {Array<Feature|RenderFeature>} features Array of features to add to the batch
@param {import("../../proj.js").TransformFunction} [projectionTransform] Projection transform.