Force strict type.

Author: tannguyen04

phpcs.xml

@@ -9,6 +9,7 @@
   <rule ref="DrupalPractice"/>
   <rule ref="Generic.Debug.ESLint"/>
   <rule ref="PHPCompatibility"/>
+  <rule ref="Generic.PHP.RequireStrictTypes" />
 
   <arg name="extensions" value="inc,info,install,module,php,profile,test,theme,js,css"/>
   <arg name="colors"/>

rector.php

@@ -18,6 +18,7 @@
 use DrupalRector\Set\Drupal9SetList;
 use Rector\Config\RectorConfig;
 use Rector\Set\ValueObject\SetList;
+use Rector\TypeDeclaration\Rector\StmtsAwareInterface\DeclareStrictTypesRector;
 
 return static function (RectorConfig $rectorConfig): void {
   $rectorConfig->sets([
@@ -29,6 +30,8 @@
     Drupal10SetList::DRUPAL_10,
   ]);
 
+  $rectorConfig->rule(DeclareStrictTypesRector::class);
+
   $drupalFinder = new DrupalFinder();
   $drupalFinder->locateRoot(__DIR__);
   $drupalRoot = $drupalFinder->getDrupalRoot();