DocblockVarFromParamDocblockInConstructorRector

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Add @var array docblock to a property based on @param of constructor assign

 class SomeClass
 {
+    /**
+     * @var string[]
+     */
     private array $items;

     /**
      * @param string[] $items
      */
     public function __construct(array $items)
     {
         $this->items = $items;
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclarationDocblocks\Rector\Class_\DocblockVarFromParamDocblockInConstructorRector;

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