67.js

var source = require('vinyl-source-stream');
// ...
      .transform(babelifyConfig) // the same as -t command line parameter
      .bundle() // "readable stream with the javascript file contents"
      .pipe(source('bundle.js')) // "conventional text stream at the start of our gulp pipeline", wrapped with "pipe" method
      .pipe(gulp.dest('dist')); // standard gulp way to redirect gulp pipe to directory