diff --git a/lib/class-argument-data.php b/lib/class-argument-data.php
new file mode 100644
index 0000000..c725d1e
--- /dev/null
+++ b/lib/class-argument-data.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace WP_Parser;
+
+final readonly class ArgumentData extends DTO {
+	/**
+	 * @param array<int, mixed> $tags
+	 */
+	public function __construct(
+		public string $name,
+		public ?string $default,
+		public string $type,
+	) {}
+}
diff --git a/lib/runner.php b/lib/runner.php
index 64fbb66..0e7bd9f 100644
--- a/lib/runner.php
+++ b/lib/runner.php
@@ -137,16 +137,16 @@ function export_docblock( Property|Method|Hook|File|Function_|Class_ $element )
 /**
  * @param \phpDocumentor\Reflection\Php\Argument[] $arguments
  *
- * @return array
+ * @return array<int, ArgumentData>
  */
-function export_arguments( array $arguments ) {
+function export_arguments( array $arguments ) : array {
 	$output = array();
 
 	foreach ( $arguments as $argument ) {
-		$output[] = array(
-			'name'    => '$' . $argument->getName(),
-			'default' => $argument->getDefault(),
-			'type'    => (string) $argument->getType(),
+		$output[] = new ArgumentData(
+			'$' . $argument->getName(),
+			$argument->getDefault(),
+			(string) $argument->getType(),
 		);
 	}