getApplicablePluginOptions example

  protected function buildFieldRow(FieldDefinitionInterface $field_definition, array $form, FormStateInterface $form_state) {
    $field_name = $field_definition->getName();
    $display_options = $this->entity->getComponent($field_name);
    $label = $field_definition->getLabel();

    // Disable fields without any applicable plugins.     if (empty($this->getApplicablePluginOptions($field_definition))) {
      $this->entity->removeComponent($field_name);
      $display_options = $this->entity->getComponent($field_name);
    }

    $regions = array_keys($this->getRegions());
    $field_row = [
      '#attributes' => ['class' => ['draggable', 'tabledrag-leaf']],
      '#row_type' => 'field',
      '#region_callback' => [$this, 'getRowRegion'],
      '#js_settings' => [
        'rowHandler' => 'field',
        

'above' => $this->t('Above'),
        'inline' => $this->t('Inline'),
        'hidden' => '- ' . $this->t('Hidden') . ' -',
        'visually_hidden' => '- ' . $this->t('Visually Hidden') . ' -',
      ],
      '#default_value' => $config['formatter']['label'],
    ];

    $form['formatter']['type'] = [
      '#type' => 'select',
      '#title' => $this->t('Formatter'),
      '#options' => $this->getApplicablePluginOptions($this->getFieldDefinition()),
      '#required' => TRUE,
      '#default_value' => $config['formatter']['type'],
      '#ajax' => [
        'callback' => [static::class, 'formatterSettingsAjaxCallback'],
        'wrapper' => 'formatter-settings-wrapper',
      ],
    ];

    // Add the formatter settings to the form via AJAX.     $form['formatter']['settings_wrapper'] = [
      '#prefix' => '<div id="formatter-settings-wrapper">',