nl_tokens: Gathers files that will be modified .
pl_tokens: function getFiles ( config ) { return new Promise ( ( resolve , reject ) => { const src = config . src ; let files = [ ] ; let i = 0 ; ( function proceed ( error , moreFiles ) { if ( <mask> !== null ) { reject ( error ) ; } else { files = files . concat ( moreFiles ) ; if ( i === src . length ) { if ( files . length === 0 ) { reject ( "No input files found" ) ; } else { resolve ( [ config , files ] ) ; } } else { glob ( src [ i ++ ] , proceed ) ; } } } ( null , [ ] ) ) ; } ) ; }