sortcomments

Example module to change the sort order of comments in Drupal 8 using function hook_query_TAG_alter. It is possible to configure sort order (newer or older first) per comment field, using the "comment field configuration" in "manage fields and settings" for your content type.

Corresponding issue for Drupal 7:

=> https://www.drupal.org/node/1095656

Drupal 8.2.x database.api.php / Perform alterations to a structured query for a given tag:

=> https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Database%21database.api.php/function/hook_query_TAG_alter/8.2.x