Drush PsySH config

config.php

<?php

$config = [];

# If the shell has been booted by drush check for a version file.
if (function_exists('drush_drupal_major_version')) {
  $drupal_version = drush_drupal_major_version();
  $include_path = __DIR__ . '/includes';
  $drupal_version_include = "$include_path/drupal-$drupal_version.php";

  if ($drupal_version && file_exists($drupal_version_include)) {
    $config['defaultIncludes'][] = $drupal_version_include;
  }
}

return $config;

drupal-8.php

<?php

echo sprintf("Drupal version: %s\n", \Drupal::VERSION);

$em = \Drupal::entityManager();
$config_factory = \Drupal::configFactory();
$http_client = \Drupal::httpClient();
$module_handler = \Drupal::moduleHandler();
$token = \Drupal::token();
$csrf = \Drupal::csrfToken();
$url_generator = \Drupal::urlGenerator();
$link_generator = \Drupal::linkGenerator();

// Create an alias with no namespace for each entity type.
// E.g. 'Drupal\node\Entity\Node' gets an alias of 'Node'.
foreach ($em->getDefinitions() as $entity_type) {
  $class = $entity_type->getClass();
  class_alias($class, (new \ReflectionClass($class))->getShortName());
}