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programmatically enable and disable theme from update hook

I need to programmatically update my default theme and disable bartik on a live site. I know I need to update the config. In Drupal 7 I would have used theme_enable(), but I am not sure how to do this in Drupal 8. Below my function sets ‘mycustomtheme’ by default but it does not enable the theme. Thanks in advance.

  function mysite_deploy_update_8001() {       Drupal::configFactory()       ->getEditable('system.theme')       ->set('default', 'mycustomtheme')       ->save();     }
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programmatically enable and disable theme from update hook

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