Added rector

Author: rkrx

.gitignore

@@ -10,4 +10,5 @@
 !/composer.json
 !/phpstan.neon
 !/README.md
+!/rector.php
 !/tests.xml

composer.json

@@ -17,7 +17,8 @@
 	"require-dev": {
 		"phpunit/phpunit": ">= 6.0",
 		"phpstan/phpstan": ">= 0.1",
-		"jetbrains/phpstorm-attributes": "^1.0"
+		"jetbrains/phpstorm-attributes": "^1.0",
+		"rector/rector": "^0.18.13"
 	},
 	"autoload": {
 		"psr-4": {

rector.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
+use Rector\Config\RectorConfig;
+use Rector\DeadCode\Rector\ClassMethod\RemoveUselessParamTagRector;
+use Rector\Php80\Rector\FunctionLike\MixedTypeRector;
+use Rector\Set\ValueObject\LevelSetList;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ]);
+
+    // register a single rule
+    $rectorConfig->rule(InlineConstructorDefaultToPropertyRector::class);
+
+	$rectorConfig->skip([RemoveUselessParamTagRector::class]);
+	$rectorConfig->skip([MixedTypeRector::class]);
+
+	// define sets of rules
+	$rectorConfig->sets([
+		LevelSetList::UP_TO_PHP_80
+	]);
+};