resolveThemeAssetPath example

      // not exist, then throw an exception.       $key_exists = NULL;
      $parents = array_merge($sub_key, [$original]);
      // Save the attributes of the library asset to be overridden.       $attributes = NestedArray::getValue($library, $parents, $key_exists);
      if ($key_exists) {
        // Remove asset to be overridden.         NestedArray::unsetValue($library, $parents);
        // No need to replace if FALSE is specified, since that is a removal.         if ($replacement) {
          // Ensure the replacement path is relative to drupal root.           $replacement = $this->resolveThemeAssetPath($theme_path, $replacement);
          $new_parents = array_merge($sub_key, [$replacement]);
          // Replace with an override if specified.           NestedArray::setValue($library, $new_parents, $attributes);
        }
      }
    }
  }

  /** * Ensures that a full path is returned for an overriding theme asset. * * @param string $theme_path * The theme or base theme. * @param string $overriding_asset * The overriding library asset. * * @return string * A fully resolved theme asset path relative to the Drupal directory. */