Rules static helpers

createRulesComponentExample.php

<?php
$rule = \Drupal\rules\Rules::expressionManager()
  ->createRule([
  'context_definitions' => [
    'user' => [
      'type' => 'entity:user',
      'label' => 'User',
      'description' => 'The user whose mail address to print.',
    ],
  ],
]);

$rule->addAction('rules_system_message', \Drupal\rules\Context\ContextConfig::create()
  ->map('message', 'user:mail:value'));

$config_entity = \Drupal\rules\Entity\RulesComponent::create([
  'id' => 'rules_test_default_component'
])->setExpression($rule);
$config_entity->save();

?>