Improve types on routes

[nbayramberdiyev]

My routes are defined as follows: ->get('/', [HomeController::class, 'index']);, which is a valid route definition. However, the latest version of Psalm emits the following error:

Argument 2 of Slim\App::get expects a public static callable, but a non-static callable provided (see https://psalm.dev/004)

This PR addresses this issue by adding the array{class-string, string} type to the route handler definition.

[coveralls]

coverage: 99.523% (+0.001%) from 99.522%
when pulling c23d3c2 on nbayramberdiyev:improve-types-on-routes
into ad56812 on slimphp:4.x.

[odan]

Hi! For Slim, we only use phpstan and not psalm. We also do not intend to support the psalm-specific "syntax" for the docblocks because it would be too much effort to maintain both. Thank you for your understanding.

[nbayramberdiyev]

Hi! For Slim, we only use phpstan and not psalm. We also do not intend to support the psalm-specific "syntax" for the docblocks because it would be too much effort to maintain both. Thank you for your understanding.

I'm having some trouble understanding this. The syntax isn't specific to Psalm, it's also used by PHPStan. That said, the current definition of string|callable for the route handler is incomplete for either static analysis tool. Just to clarify, I'm not trying to introduce any Psalm-specific syntax here.