nl_tokens: In hindsight we can do without most of ES6 ( str obj ) - > transformStream
pl_tokens: function es2020 ( filename , options ) { if ( / \.json$ / i . test ( filename ) ) return through ( ) const bufs = [ ] const transformStream = through ( write , end ) return transformStream function write ( buf , enc , next ) { bufs . push ( buf ) next ( ) } function end ( ) { const src = Buffer . concat ( bufs ) . toString ( 'utf8' ) try { var res = babel . transform ( src , { plugins : preset . plugins , sourceMaps : options . _flags . debug ? 'inline' : false , filename : filename , compact : false } ) } catch ( err ) { this . emit ( 'error' , err ) return } this . push ( res . <mask> ) this . push ( null ) } }