removeFeatures(features) {
    let removed = false;
    for (let i = 0, ii = features.length; i < ii; ++i) {
      removed = this.removeFeatureInternal(features[i]) || removed;
    }
    if (removed) {
      this.changed();
    }
  }
Batch remove features from the source.  If you want to remove all features
at once, use the {@link module:ol/source/Vector~VectorSource#clear #clear()} method
instead.
@param {Array<FeatureType>} features Features to remove.
@api