Auto create content inside main collection for new pages in Neos CMS

Package.php

<?php
namespace Acme\Demo;

use TYPO3\Flow\Package\Package as BasePackage;
use TYPO3\TYPO3CR\Domain\Model\NodeInterface;

class Package extends BasePackage {

	/**
	 * @var \TYPO3\TYPO3CR\Domain\Service\NodeTypeManager nodeTypeManager
	 */
	protected $nodeTypeManager;

	/**
	 * @param \TYPO3\Flow\Core\Bootstrap $bootstrap The current bootstrap
	 * @return void
	 */
	public function boot(\TYPO3\Flow\Core\Bootstrap $bootstrap) {
		$dispatcher = $bootstrap->getSignalSlotDispatcher();
		$dispatcher->connect('TYPO3\TYPO3CR\Domain\Model\Node', 'nodeAdded', function(NodeInterface $node) use($bootstrap) {
			/** @var \TYPO3\TYPO3CR\Domain\Service\NodeTypeManager nodeTypeManager */
			$this->nodeTypeManager = $bootstrap->getObjectManager()->get('TYPO3\TYPO3CR\Domain\Service\NodeTypeManager');
			// if we currently created ContentCollection "main" inside parent "Page" ...
			if ($node->getName() === 'main'
			  && $node->getNodeType()->getName() === 'TYPO3.Neos:ContentCollection'
				&& $node->getParent()
				&& $node->getParent()->getNodeType()->getName() === 'Acme:Page') {
				$node->createNode(uniqid('node'), $this->nodeTypeManager->getNodeType('Acme.Demo:Teaser'));
			}
		});
	}
}