RenameVariableToMatchMethodCallReturnTypeRector

Rename variable to match method return type

 class SomeClass
 {
     public function run()
     {
-        $a = $this->getRunner();
+        $runner = $this->getRunner();
     }

     public function getRunner(): Runner
     {
         return new Runner();
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Naming\Rector\Assign\RenameVariableToMatchMethodCallReturnTypeRector;

return RectorConfig::configure()
    ->withRules([
        RenameVariableToMatchMethodCallReturnTypeRector::class,
    ]);
SETS:  Naming