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I'm trying to attach a js file to a form using hook_form_alter() but I don't want to js to be loaded on the administration template.

How can I achieve something like this? With what do I need to replace the THEME != ADMINTHEME part in the following code snippet?

/**
 * Implements hook_form_alter().
 */
function MYMODULE_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  if (($form_id == 'node_CUSTOM_edit_form' || $form_id == 'node_CUSTOM_form') && THEME !== ADMINTHEME) {
    $form['#attached']['library'][] = 'MYMODULE/myLib';
  }
}
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    Does this answer your question? How to test if current page is an admin page? – leymannx Apr 29 at 14:26
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    Just add an not-operator in front of \Drupal::service('router.admin_context')->isAdminRoute(). Like if (!\Drupal::service('router.admin_context')->isAdminRoute()) { ... }. – leymannx Apr 29 at 14:28
  • (You also need to pay attention to your if-request. I edited your question to wrap the two form ID parts in an extra set of brackets to make sense. You could also use in_array() for that.) – leymannx Apr 29 at 14:34
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    If this is for the public facing theme, why not do it in the theme itself rather than a module? – Alfred Armstrong Apr 29 at 16:02
  • Thank you leymannx for your suggestion. I've seen that answer and tried to make it work but it only obliges to one condition or the other (it doesn't work when I check for both my node form && not the admin theme). Alfred Armstrong - thanks. This solved my issue but did not necessarily answer the question in the first place. – Florin Simion Apr 30 at 8:31
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To answer your question, you can get the active theme name using below code in module file.

$activeTheme = \Drupal::service('theme.manager')->getActiveTheme()->getName()

and check if $activeTheme !== 'Your admin theme'.

Recommended way:

In your case as you want to add library specific to theme, it should be added in theme file and not module file.

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