Added Rector.

.gitattributes

@@ -15,3 +15,4 @@
 /phpunit.xml.dist       export-ignore
 /psalm.xml.dist         export-ignore
 /codecov.yml            export-ignore
+/rector.php             export-ignore

Makefile

@@ -31,5 +31,8 @@ code-style-fix: php-info install ## Fix code style
 psalm: php-info install ## Run Psalm check
 	$(PHP) vendor/bin/psalm --config=psalm.xml.dist --threads=4 --show-snippet=true --show-info=true
 
-.PHONY: php-info list install install-force update test test-coverage mutation-test code-style-fix psalm
+rector: php-info install ## Run Rector
+	$(PHP) vendor/bin/rector process --clear-cache --dry-run
+
+.PHONY: php-info list install install-force update test test-coverage mutation-test code-style-fix psalm rector
 .DEFAULT_GOAL := list

composer.json

@@ -62,7 +62,8 @@
         "phpmd/phpmd":                         "^1.5",
         "sebastian/phpcpd":                    "^6.0",
         "phploc/phploc":                       "^7.0",
-        "php-parallel-lint/php-parallel-lint": "^1.3"
+        "php-parallel-lint/php-parallel-lint": "^1.3",
+        "rector/rector": "^1.0"
     },
     "extra": {
         "platform": {

rector.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
+use Rector\Config\RectorConfig;
+use Rector\Set\ValueObject\LevelSetList;
+//use Rector\Set\ValueObject\SetList;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ]);
+
+    $rectorConfig->skip([]);
+
+    $rectorConfig->importNames();
+    $rectorConfig->importShortClasses(false);
+
+    // register a single rule
+    $rectorConfig->rule(InlineConstructorDefaultToPropertyRector::class);
+
+    $rectorConfig->sets([
+        LevelSetList::UP_TO_PHP_81,
+/*        SetList::PHP_81,
+        SetList::CODE_QUALITY,
+        SetList::DEAD_CODE,*/
+    ]);
+};