BoolReturnTypeFromBooleanConstReturnsRector

Add return bool, based on direct true/false returns

 class SomeClass
 {
-    public function resolve($value)
+    public function resolve($value): bool
     {
         if ($value) {
             return false;
         }

         return true;
     }
 }

Configure your rector.php:

<?php

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

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