Added drupal_dump function.

composer.json

@@ -0,0 +1,15 @@
+{
+  "name": "drupal/twig_tweak",
+  "type": "drupal-module",
+  "description": "A Twig extension with some useful functions and filters for Drupal development.",
+  "keywords": ["Drupal", "Twig"],
+  "license": "GPL-2.0+",
+  "homepage": "https://www.drupal.org/project/twig_tweak",
+  "suggest": {
+    "symfony/var-dumper": "Provides a better dump() function that can help you debug Twig variables."
+  },
+  "support": {
+    "issues": "https://www.drupal.org/project/issues/twig_tweak",
+    "source": "http://cgit.drupalcode.org/twig_tweak"
+  }
+}

src/TwigExtension.php

@@ -109,6 +109,8 @@ class TwigExtension extends \Twig_Extension {
       new \Twig_SimpleFunction('drupal_field', [$this, 'drupalField']),
       new \Twig_SimpleFunction('drupal_menu', [$this, 'drupalMenu']),
       new \Twig_SimpleFunction('drupal_config', [$this, 'drupalConfig']),
+      new \Twig_SimpleFunction('drupal_dump', [$this, 'drupalDump']),
+      new \Twig_SimpleFunction('dd', [$this, 'drupalDump']),
       // Wrap drupal_set_message() because it returns some value which is not
       // suitable for Twig template.
       new \Twig_SimpleFunction('drupal_set_message', [$this, 'drupalSetMessage']),
@@ -409,4 +411,26 @@ class TwigExtension extends \Twig_Extension {
     return $build;
   }
 
+  /**
+   * Dumps information about variables.
+   */
+  public function drupalDump() {
+    $var_dumper = '\Symfony\Component\VarDumper\VarDumper';
+    if (class_exists($var_dumper)) {
+      call_user_func($var_dumper . '::dump', func_get_args());
+    }
+    else {
+      trigger_error('Could not dump the variable because symfony/var-dumper component is not installed.', E_USER_WARNING);
+    }
+  }
+
+  /**
+   * An alias for self::drupalDump().
+   *
+   * @see \Drupal\twig_tweak\TwigExtension::drupalDump();
+   */
+  public function dd() {
+    $this->drupalDump(func_get_args());
+  }
+
 }