AddReturnDocblockForJsonArrayRector

Find another rule

Add @return docblock for array based on return of json_decode() return array

 final class SomeClass
 {
+    /**
+     * @return array<string, mixed>
+     */
     public function provide(string $contents): array
     {
         return json_decode($contents, true);
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclarationDocblocks\Rector\ClassMethod\AddReturnDocblockForJsonArrayRector;

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