TypeDoesNotContainType: 'Closure' cannot be identical to class-string<callable-object>

[XedinUnknown]

Hi!

Getting this:

TypeDoesNotContainType : 'Closure' cannot be identical to class-string<callable-object>

How so? Closure is a class-string. And an instance of Closure is a callable and an object.

Or no?

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/35903eb1ed

<?php

function isWhatever (callable $callable): bool
{
 	   return is_object($callable) && get_class($callable) === 'Closure';
}

Psalm output (using commit 08afc45):

ERROR: TypeDoesNotContainType - 5:37 - 'Closure' cannot be identical to class-string<callable-object>

[ghostwriter]

Hey @XedinUnknown,

Closure is a not a class-string in this case, because it is written as a string 'Closure’.

You can use \Closure::class instead.

https://psalm.dev/r/276a6dafc9

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/276a6dafc9

<?php

function isWhatever (callable $callable): bool
{
 	   return is_object($callable) && $callable instanceof Closure;
}


function isWhatever2(callable $callable): bool
{
 	   return is_object($callable) && get_class($callable) === \Closure::class;
}

Psalm output (using commit 08afc45):

No issues!