ercore-8.x-1.20/modules/ercore_presentation/ercore_presentation.module

<?php

/**
 * @file
 * PHP file {ercore_presentation.module} for use with eightball.
 */

use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_alter().
 */
function ercore_presentation_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if ($form_id === 'node_ercore_presentation_form' || $form_id === 'node_ercore_presentation_edit_form') {
    $form['field_ercore_nsf']['#states'] = [
      'visible' => [
        ':input[name="field_ercore_ps_status"]' => ['value' => '0'],
      ],
      'required' => [
        ':input[name="field_ercore_ps_status"]' => ['value' => '0'],
      ],
    ];
  }
}