class FreeConfigContext

ConfigImporter.php in drupal/core/lib/Drupal/Core/Config/ConfigImporter.php

Contains \Drupal\Core\Config\ConfigImporter.

core.services.yml in drupal/core/core.services.yml

drupal/core/core.services.yml

class FreeConfigContext extends ConfigContext {

  /**
   * Implements \Drupal\Core\Config\Context\ContextInterface::getOverrides().
   */
  public function getOverrides($config_name) {

    // Do nothing as this is override free.
    return FALSE;
  }

  /**
   * Implements \Drupal\Core\Config\Context\ContextInterface::setOverride().
   */
  public function setOverrides($config_name, $data) {

    // Do nothing as this is override free.
  }

}