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I've just started to use Drupal 8's Entity Validation API and I'm applying constraints to entities in the following way using hook_entity_bundle_field_info_alter:

MYMODULE_entity_bundle_field_info_alter(&$fields, \Drupal\Core\Entity\EntityTypeInterface $entity_type, $bundle) {

  switch ($bundle) {
    case 'example_content_type':
      $overlay_text = $fields['field_example_text']; 
      $overlay_text->addConstraint('NotNull');
        break;
  }
}

This successfully prevents the an instance of this content type being created if no value is entered in the field_example_text.

However, in this content type, I'm using conditional fields. In this scenario, I would only want to apply the NotNull constraint to field_example_text if another field, field_colors, a text list checkbox field where the user can check any number of options, has a certain value (e.g. 'Green') checked.

Conditional fields is hiding and showing dependent fields nicely based on which values in field_colors are checked, but I need to set these fields as not null via the constraints only when field_colors has a particular value. Is this possible?

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