buildVisibilityInterface example

public function form(array $form, FormStateInterface $form_state) {
    $entity = $this->entity;

    // Store the gathered contexts in the form state for other objects to use     // during form building.     $form_state->setTemporaryValue('gathered_contexts', $this->contextRepository->getAvailableContexts());

    $form['#tree'] = TRUE;
    $form['settings'] = [];
    $subform_state = SubformState::createForSubform($form['settings'], $form, $form_state);
    $form['settings'] = $this->getPluginForm($entity->getPlugin())->buildConfigurationForm($form['settings'], $subform_state);
    $form['visibility'] = $this->buildVisibilityInterface([], $form_state);

    // If creating a new block, calculate a safe default machine name.     $form['id'] = [
      '#type' => 'machine_name',
      '#maxlength' => 64,
      '#description' => $this->t('A unique name for this block instance. Must be alpha-numeric and underscore separated.'),
      '#default_value' => !$entity->isNew() ? $entity->id() : $this->getUniqueMachineName($entity),
      '#machine_name' => [
        'exists' => '\Drupal\block\Entity\Block::load',
        'replace_pattern' => '[^a-z0-9_.]+',
        'source' => ['settings', 'label'],
      ],