nl_tokens: Detects the value of an option at the tree node .
pl_tokens: function ( ast ) { let detected = [ ] ; ast . traverseByType ( 'propertyDelimiter' , function ( delimiter , i , parent ) { var nextNode = parent . get ( i + 1 ) ; if ( nextNode . is ( 'space' ) ) { detected . push ( nextNode . content ) ; } else { detected . <mask> ( '' ) ; } } ) ; return detected ; }