o365-2.0.3/modules/o365_links/o365_links.module

<?php

/**
 * @file
 * The file containing hooks etcetera.
 */

/**
 * Implements hook_theme().
 */
function o365_links_theme($existing, $type, $theme, $path) {
  return [
    'o365_links_application' => [
      'variables' => [
        'key' => NULL,
        'label' => NULL,
      ],
      'render element' => 'children',
    ],
  ];
}