/**
 * Implements hook_library_info_build().
 */
function {{ machine_name }}_library_info_build() {
  $libraries = [];
  // Add a library whose information changes depending on certain conditions.
  $libraries['mymodule.zombie'] = [
    'dependencies' => [
      'core/backbone',
    ],
  ];
  if (Drupal::moduleHandler()->moduleExists('minifyzombies')) {
    $libraries['mymodule.zombie'] += [
      'js' => [
        'mymodule.zombie.min.js' => [],
      ],
      'css' => [
        'base' => [
          'mymodule.zombie.min.css' => [],
        ],
      ],
    ];
  }
  else {
    $libraries['mymodule.zombie'] += [
      'js' => [
        'mymodule.zombie.js' => [],
      ],
      'css' => [
        'base' => [
          'mymodule.zombie.css' => [],
        ],
      ],
    ];
  }

  // Add a library only if a certain condition is met. If code wants to
  // integrate with this library it is safe to (try to) load it unconditionally
  // without reproducing this check. If the library definition does not exist
  // the library (of course) not be loaded but no notices or errors will be
  // triggered.
  if (Drupal::moduleHandler()->moduleExists('vampirize')) {
    $libraries['mymodule.vampire'] = [
      'js' => [
        'js/vampire.js' => [],
      ],
      'css' => [
        'base' => [
          'css/vampire.css',
        ],
      ],
      'dependencies' => [
        'core/jquery',
      ],
    ];
  }
  return $libraries;
}