sector-8.x-2.0-alpha4/modules/sector_blocks/sector_blocks.module

<?php

/**
 * Implements hook_theme().
 */
function sector_blocks_theme($existing, $type, $theme, $path) {
  return [
    'responsive_menu_control_block' => [
      'render element' => 'element',
    ],
    'search_desktop_fly_out_control_block' => [
      'render element' => 'element',
    ],
  ];
}