nl_tokens: Detects the value of an option at the tree node .
pl_tokens: function ( ast ) { let detected = [ ] ; ast . traverseByType ( 'string' , function ( string ) { if ( string . content [ 0 ] === '"' ) { detected . push ( 'double' ) ; } else if ( string . content [ 0 ] === '\'' ) { detected . <mask> ( 'single' ) ; } } ) ; return detected ; }