How to infer type from array item?

[cawa-93]

I have the following code

class AdminAssets
{

    public const ASSETS = [
        'js' => [
            'foo-script' => [
                'src' => 'file.js',
            ],
            'bar-script' => [
                'src' => 'file.js',
            ],
        ],
    ];

    public static function show(string $key)
    {
    }
}

How can I declare that method show can accept string union from ASSETS['js'] keys ('foo-script'|'bar-script')?

I'm tired to use @param key-of<ASSETS['js']> $key but got error [InvalidDocblock](https://psalm.dev/008) - 18:15 - Unrecognised template param 'js' in docblock for AdminAssets::show