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ReturnTypeFromStrictParamRector

Add return type based on strict parameter type

 class SomeClass
 {
-    public function resolve(ParamType $item)
+    public function resolve(ParamType $item): ParamType
     {
         return $item;
     }
 }

Configure your rector.php:

<?php

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

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