Do we have an option to change/override the drupalsettings variable which is defined by some other module through our custom module?

Question

What is the best approach to change/override the drupalsettings variable which is defined by some other module (basically core) through our custom module ? If I follow the same hooks then how to call it at very last in Drupal 8?

Here: by drupalsettings, I am asking about the Drupal behaviors variable.

The question is updated as suggested by @leymannx.

Answer 1

You can alter the drupalSettings with the hook "hook_js_settings_alter":

function hook_js_settings_alter(array &$settings, \Drupal\Core\Asset\AttachedAssetsInterface $assets) {

  // Add settings.
  $settings['user']['uid'] = \Drupal::currentUser();

  // Manipulate settings.
  if (isset($settings['dialog'])) {
    $settings['dialog']['autoResize'] = FALSE;
  }
}

For more information see: https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!theme.api.php/function/hook_js_settings_alter/8.9.x

I checked the code and the theme hook is run after the module hook. So if you really want to be last. Add the hook to your theme.

web/core/lib/Drupal/Core/Asset/AssetResolver.php:

$this->moduleHandler->alter('js_settings', $settings, $assets);
$this->themeManager->alter('js_settings', $settings, $assets);