how to run a task after sync completes

[ralyodio]

//build app into ./dist directory
gulp.task('build:dist', gulpsync.sync([
  'clean:dist',
  'build:less',
  'copy:dist'
]));

I want to run a task after copy:dist completes.

[kaminaly]

//build app into ./dist directory
gulp.task('build:dist', gulpsync.sync([
  'clean:dist',
  'build:less',
  'copy:dist',
  'some:task'
]));

Is this not work?