Extension: added abstract CompilerExtension with helper

src/Extension/CompilerExtension.php

@@ -0,0 +1,23 @@
+<?php declare(strict_types = 1);
+
+namespace Contributte\DI\Extension;
+
+use Contributte\DI\Helper\ExtensionDefinitionsHelper;
+use Nette\DI\CompilerExtension as NCompilerExtension;
+
+abstract class CompilerExtension extends NCompilerExtension
+{
+
+	/** @var ExtensionDefinitionsHelper|null */
+	private $helper;
+
+	protected function getHelper(): ExtensionDefinitionsHelper
+	{
+		if ($this->helper === null) {
+			$this->helper = new ExtensionDefinitionsHelper($this->compiler);
+		}
+
+		return $this->helper;
+	}
+
+}