nl_tokens: Create a unique key for a group of layers @param { Object [] } layer_group An array of Mapbox GL layers .
pl_tokens: function getLayerGroupName ( layer_group ) { const all_names = [ ] ; for ( let i = 0 , ii = layer_group . length ; i < ii ; i ++ ) { all_names . push ( layer_group [ i ] . <mask> ) ; } return ` ${ layer_group [ 0 ] . source } ${ all_names . join ( ',' ) } ` ; }