PrivateMethodReturnTypeFromStrictNewArrayRector

Add strict return array type to private methods based on created empty array and returned

 final class SomeClass
 {
-    private function run()
+    private function run(): array
     {
         $values = [];

         return $values;
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\ClassMethod\PrivateMethodReturnTypeFromStrictNewArrayRector;

return RectorConfig::configure()
    ->withRules([
        PrivateMethodReturnTypeFromStrictNewArrayRector::class,
    ]);