Get the node ID value after submit a Webform attached to that node

Get the node ID value after submit a Webform attached to that node

Example how to Get the node ID value after submit a Webform attached to that node.

if ($source_entity = $webform_submission->getSourceEntity()) {
   $nid = $source_entity->id();
}
else {
  $nid = NULL;
}

Example 2:

function MODULE_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  if ($form_id == 'webform_submission_product_add_form') {
    $form['actions']['submit']['#submit'][] = 'custom_submit_handler';
  }
}

function custom_submit_handler(&$form, \Drupal\Core\Form\FormStateInterface $form_state) {
  /** @var \Drupal\webform\WebformSubmissionForm $form_object */
  $form_object = $form_state->getFormObject();
  /** @var \Drupal\webform\WebformSubmissionInterface $webform_submission */
  $webform_submission = $form_object->getEntity();
  $source = $webform_submission->getSourceEntity();
  $nid = $source->id();
  kint($nid);
}