Rector\TypeDeclaration\Rector\Property\TypedPropertyFromStrictConstructorRector

TypedPropertyFromStrictConstructorRector

Add typed properties based only on strict constructor types

 class SomeObject
 {
-    private $name;
+    private string $name;

     public function __construct(string $name)
     {
         $this->name = $name;
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromStrictConstructorRector;

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

SETS: Type Declarations