SafeDeclareStrictTypesRector

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Add declare(strict_types=1) if missing and only if the file is type-safe (no scalar type coercions).

+declare(strict_types=1);
+
 function acceptsInt(int $value): void
 {
 }

 acceptsInt(5);

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\StmtsAwareInterface\SafeDeclareStrictTypesRector;

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