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ReturnTypeFromStrictFluentReturnRector

Add return type from strict return $this

 final class SomeClass
 {
-    public function run()
+    public function run(): self
     {
         return $this;
     }
 }

Configure your rector.php:

<?php

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

return RectorConfig::configure()
    ->withRules([
        ReturnTypeFromStrictFluentReturnRector::class,
    ]);
SETS:  Type Declarations