paragraphs_collection-8.x-1.x-dev/modules/paragraphs_collection_demo/paragraphs_collection_demo.module

<?php

/**
 * @file
 * Contains paragraphs_collection_demo.module
 */

/**
 * Implements hook_theme().
 */
function paragraphs_collection_demo_theme() {
  return [
    // @todo - maybe this should go to paragraphs_demo?
    'field__field_paragraphs_demo' => [
      'base hook' => 'field',
    ],
  ];
}