drupal/core/modules/breakpoint/breakpoint.install

<?php

/**
 * @file
 * Enable, install, update and uninstall functions for the breakpoint module.
 */

/**
 * Implements hook_enable().
 *
 * Import breakpoints from all enabled themes.
 */
function breakpoint_enable() {
  // Import breakpoints from themes.
  $themes = list_themes();
  _breakpoint_theme_enabled(array_keys($themes));

  // Import breakpoints from modules.
  _breakpoint_modules_enabled(array_keys(Drupal::moduleHandler()->getModuleList()));
}