Form Factory Kits
Dependencies
Form Factory Kits
$checkboxes = $k->checkboxes('foo')
  ->setTitle($this->t('Foo'))
  ->setDescription($this->t('Foo description.'))
  ->appendOption('bar', $this->t('Bar')),
  ->appendOption('baz', $this->t('Baz')),
  ->appendOption('qux', $this->t('Qux')),
  ->setDefaultValue(['baz']);