Require promoted properties

build/rector-downgrade.php

@@ -7,7 +7,9 @@
 use Rector\DowngradePhp74\Rector\ArrowFunction\ArrowFunctionToAnonymousFunctionRector;
 use Rector\DowngradePhp74\Rector\Property\DowngradeTypedPropertyRector;
 use Rector\DowngradePhp80\Rector\Catch_\DowngradeNonCapturingCatchesRector;
+use Rector\DowngradePhp80\Rector\Class_\DowngradePropertyPromotionRector;
 use Rector\DowngradePhp80\Rector\ClassMethod\DowngradeTrailingCommasInParamUseRector;
+use Rector\DowngradePhp80\Rector\FunctionLike\DowngradeUnionTypeDeclarationRector;
 use Rector\DowngradePhp80\Rector\Property\DowngradeUnionTypeTypedPropertyRector;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
 
@@ -41,6 +43,8 @@
 		$services->set(DowngradeTrailingCommasInParamUseRector::class);
 		$services->set(DowngradeNonCapturingCatchesRector::class);
 		$services->set(DowngradeUnionTypeTypedPropertyRector::class);
+		$services->set(DowngradePropertyPromotionRector::class);
+		$services->set(DowngradeUnionTypeDeclarationRector::class);
 	}
 
 	if ($targetPhpVersionId < 70400) {

phpcs.xml

@@ -165,6 +165,11 @@
 			<property name="nullPosition" value="last"/>
 		</properties>
 	</rule>
+	<rule ref="SlevomatCodingStandard.Classes.RequireConstructorPropertyPromotion">
+		<properties>
+			<property name="enable" value="true"/>
+		</properties>
+	</rule>
 	<exclude-pattern>tests/*/data</exclude-pattern>
 	<exclude-pattern>tests/*/Fixture</exclude-pattern>
 	<exclude-pattern>tests/e2e/resultCache_1.php</exclude-pattern>