bibcite_footnotes_2/footnotes.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Footnotes module.
 */

/**
 * Implements hook_requirements().
 */
function footnotes_requirements($phase) {
  if ($phase != 'runtime') {
    return [];
  }

  // Check if fakeobjects module is enabled and properly configured.
  $fakeobjects_exist = \Drupal::moduleHandler()->moduleExists('fakeobjects');
  if ($fakeobjects_exist) {
    $fakeobjects_requirements = fakeobjects_requirements($phase);
    if ($fakeobjects_requirements['fakeobjects']['severity'] === REQUIREMENT_OK) {
      $requirements['footnotes'] = [
        'title' => t('Footnotes'),
        'value' => t('Footnotes requirements are OK.'),
        'severity' => REQUIREMENT_OK,
      ];
    }
    else {
      $requirements['footnotes'] = [
        'title' => t('Footnotes'),
        'value' => t('Footnotes requirements are not properly configured. Please check Fakeobjects module requirements.'),
        'severity' => REQUIREMENT_ERROR,
      ];
    }
  }
  else {
    $requirements['footnotes'] = [
      'title' => t('Footnotes'),
      'value' => t("<a href=':href'>Fakeobjects module</a> isn't installed/enabled.", [':href' => 'https://www.drupal.org/project/fakeobjects']),
      'severity' => REQUIREMENT_ERROR,
      'description' => t('Footnotes module has a dependency on Fakeobjects module. Ensure that Fakeobjects module is enabled and configured.'),
    ];
  }

  return $requirements;
}