FalseType

[brandonkelly]

It seems there is currently no support for the false pseudo type that can be used in union types as of PHP 8.0.

Would be great if a FalseType was added that could be used within UnionType.

[samsonasik]

The false in multiple types in Union Type is supported since 16 days ago rectorphp/rector-src#1804, eg:

/**
 *@var null|false|\stdClass
 */
private $unionValue;

will be converted to:

private \stdClass|false|null $unionValue = null;

 class Test4
 {
-    /**
-     *@var null|false|\stdClass
-    */
-    private $unionValue;
+    private \stdClass|false|null $unionValue = null;

with TypedPropertyRector with configure:

<?php

declare(strict_types=1);

use Rector\Core\Configuration\Option;
use Rector\Core\ValueObject\PhpVersionFeature;
use Rector\Php74\Rector\Property\TypedPropertyRector;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

return static function (ContainerConfigurator $containerConfigurator): void {
    $services = $containerConfigurator->services();
    $services->set(TypedPropertyRector::class);

    $parameters = $containerConfigurator->parameters();
    $parameters->set(Option::PHP_VERSION_FEATURES, PhpVersionFeature::UNION_TYPES);
};

It seems it still in dev-main, you can use:

composer config minimum-stability dev
composer config prefer-stable true
composer update rector/rector:dev-main

is that works for you?

[brandonkelly]

I specifically need to use it with AddReturnTypeDeclarationRector, e.g.

return static function(ContainerConfigurator $containerConfigurator): void {
    $services = $containerConfigurator->services();

    $services->set(AddReturnTypeDeclarationRector::class)
        ->configure([
            new AddReturnTypeDeclaration('my\\class', 'myMethod', new UnionType([
                new IntegerType(),
                new FalseType(),
            ]))
        ]);
};

[samsonasik]

@brandonkelly you can use PHPStan\Type\Constant\ConstantBooleanType(false) for that:

return static function(ContainerConfigurator $containerConfigurator): void {
    $services = $containerConfigurator->services();

    $services->set(AddReturnTypeDeclarationRector::class)
        ->configure([
            new AddReturnTypeDeclaration('my\\class', 'myMethod', new UnionType([
                new \PHPStan\Type\IntegerType(),
                new \PHPStan\Type\Constant\ConstantBooleanType(false)(),
            ]))
        ]);
};

[brandonkelly]

Oh wonderful, thank you!