Passing string to view() function generates warning that the type should be view-string|null

[robopzet]

• Larastan Version: 2.2.7
• --level used: 9
• Pull request with failing test: -

Description

PHPStan generates this warning for the given code:

Parameter #1 $view of function view expects view-string|null, string given.

The definition of the Laravel view() function describes the first parameter as string|null. The warning says it should be of type view-string|null. I do not understand why passing a string is not valid here.

Laravel code where the issue was found

    /**
     * @param string $fil
     * @param array<string, mixed> $dta
     * @return View
     */
    private function vw (
        string  $fil,
        array   $dta
    ): View {
        return view(sprintf(Settings::VW_BAS_TPL, $fil), $dta);
    }

    // Definition of Settings::VW_BAS_TPL:
    public const VW_BAS_TPL = 'path/to/templates/%s';

[szepeviktor]

Hello @robopzet! 👋🏻
view-string is our specialty :)
https://github.com/nunomaduro/larastan/blob/master/docs/custom-types.md

Please suppress the error. It does not support generated view names.

[szepeviktor]

Or you may force the type.

        /** @var view-string $viewName */
        $viewName = sprintf(Settings::VW_BAS_TPL, $fil);

        return view($viewName, $dta);

[mad-briller]

if this is merged you can use view()->exists($viewName) to check it is a view-string:
#1464

[robopzet]

Thanks for the suggestions, and the quick PR!