function hydrateLayerGroup(layersDef, layerGroup) {
  const hydrated_group = [];
  for (let i = 0, ii = layerGroup.length; i < ii; i++) {
    // hydrateLayer checks for "ref"
    hydrated_group.push(hydrateLayer(layersDef, layerGroup[i]));
  }
  return hydrated_group;
}
function hydrateLayerGroup(layersDef, layerGroup) {
  const hydrated_group = [];
  for (let i = 0, ii = layerGroup.length; i < ii; i++) {
    
    hydrated_group.push(hydrateLayer(layersDef, layerGroup[i]));
  }
  return hydrated_group;
}
function hydrateLayerGroup ( layersDef , layerGroup ) { const hydrated_group = [ ] ; for ( let i = 0 , ii = layerGroup . length ; i < ii ; i ++ ) { // hydrateLayer checks for "ref" hydrated_group . push ( hydrateLayer ( layersDef , layerGroup [ i ] ) ) ; } return hydrated_group ; }
Hydrate a layer group
Normalizes all the ref layers in a group.

@param {Object[]} layersDef All layers defined in the Mapbox GL stylesheet.
@param {Object[]} layerGroup Subset of layers to be rendered as a group.

@returns {Object[]} An array with the ref layers normalized.
Hydrate a layer group Normalizes all the ref layers in a group .