Gulp, how to execute 2 tasks without intermediate write to disk?

Question

gulp.js

Good afternoon!
Since writing to disk is a time-consuming task. I would like to speed up the execution, due to the flow, but it does not occur to me how this can be done in 1 pass (task). Help out :)

gulp.task('coffee', function() {
  return gulp.src(paths.src.coffee)
  .pipe(coffee())
  .pipe(concat('buildCoffee.js'))
  .pipe(gulp.dest(paths.build.tmp));
});

gulp.task('scripts', ['coffee'], function() {
  gulp.src(paths.src.libsJS) // libsJS включает в себя и файл записанный на диск в таске coffee
  .pipe(concat('all.js'))
  .pipe(gulp.dest(paths.build.scripts));
});

Answer 1

ANSWER :
As an option, there is: event-stream
Or gulp-if:

gulp.task('scripts', function() {
  gulp.src(paths.src.scripts)
  .pipe(gulpif(/[.]coffee$/, coffee()))
  .pipe(concat('all.js'))
  .pipe(gulp.dest(paths.build.scripts));
});