code: function readRawFeature(pbf, layer, i) {
    pbf.pos = layer.features[i];
    const end = pbf.readVarint() + pbf.pos;
  
    const feature = {
      layer: layer,
      type: 0,
      properties: {}
    };
    pbf.readFields(featurePBFReader, feature, end);
    return feature;
  }
docs: Read a raw feature from the pbf offset stored at index `i` in the raw layer.
  @param {PBF} pbf PBF.
  @param {Object} layer Raw layer.
  @param {number} i Index of the feature in the raw layer's `features` array.
  @return {Object} Raw feature.