Returns the libraries that need to be loaded.

For example, with core/a depending on core/c and core/b on core/d:

$assets = new AttachedAssets();
$assets->setLibraries([
  'core/a',
  'core/b',
  'core/c',
]);
$assets->setAlreadyLoadedLibraries([
  'core/c',
]);
$resolver->getLibrariesToLoad($assets) === [
  'core/a',
  'core/b',
  'core/d',
];

Parameters

\Drupal\Core\Asset\AttachedAssetsInterface $assets: The assets attached to the current response.

Return value

string[] A list of libraries and their dependencies, in the order they should be loaded, excluding any libraries that have already been loaded.

3 calls to AssetResolver::getLibrariesToLoad()

AssetResolver::getCssAssets in core/lib/Drupal/Core/Asset/AssetResolver.php

Returns the CSS assets for the current response's libraries.

AssetResolver::getJsAssets in core/lib/Drupal/Core/Asset/AssetResolver.php

Returns the JavaScript assets for the current response's libraries.

AssetResolver::getJsSettingsAssets in core/lib/Drupal/Core/Asset/AssetResolver.php

Returns the JavaScript settings assets for this response's libraries.

File

core/lib/Drupal/Core/Asset/AssetResolver.php, line 104

Class

AssetResolver

The default asset resolver.

Namespace

Drupal\Core\Asset

Code

protected function getLibrariesToLoad(AttachedAssetsInterface $assets) {
  // The order of libraries passed in via assets can differ, so to reduce
  // variation, first normalize the requested libraries to the minimal
  // representative set before then expanding the list to include all
  // dependencies.
  // @see Drupal\FunctionalTests\Core\Asset\AssetOptimizationTestUmami
  // @todo https://www.drupal.org/project/drupal/issues/1945262
  $libraries = $assets->getLibraries();
  if ($libraries) {
    $libraries = $this->libraryDependencyResolver
      ->getMinimalRepresentativeSubset($libraries);
  }
  return array_diff($this->libraryDependencyResolver
    ->getLibrariesWithDependencies($libraries), $this->libraryDependencyResolver
    ->getLibrariesWithDependencies($assets->getAlreadyLoadedLibraries()));
}

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