AddGenericReturnTypeToRelationsRector

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Add generic return type to relations in child of Illuminate\Database\Eloquent\Model

 use App\Account;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;

 class User extends Model
 {
+    /** @return HasMany<Account> */
     public function accounts(): HasMany
     {
         return $this->hasMany(Account::class);
     }
 }

Configure your rector.php:

<?php

use RectorLaravel\Rector\ClassMethod\AddGenericReturnTypeToRelationsRector;
use Rector\Config\RectorConfig;

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