Laravel默认帮助方法和外观不适用于自定义包

I am developing a custom package where I need an access to the config data. I was able to pull data from config through my blade files, however, when I tried to call it from any custom classes I made, it's throwing an error:

Error: Call to undefined function Acme\Package\config()

What's interesting though, is that, when I tried using the facade Illuminate\Support\Facades\Config, it cannot find the class.

Is there any way I could retrieve data from the config (from the package and/or the app)?

<?php

namespace Acme\Package;

class MyClass {
    public function test() {
        config('app.name');
    }
}

UPDATE: It works when running in the browser (package installed in a Laravel project) but fails when running package's test

UPDATE: If this helps, my package can be found here

Call to the config() is from here

And the test case that fails can be found here

<?php

namespace Acme\Package;

class MyClass {
    public function test() {
        \Illuminate\Support\Facades\Config::get('app.name');
    }
}

Try like this, to use the full namespace to the Config Facade. You could also make a use statement under your namespace to inject the facade and then use Config::get('app.name). The reason it is not working is that your package cannot resolve the namespace of that facade as it is outside of the IoC container

You should try this:

<?php

    namespace Acme\Package;
    use Config;

    class MyClass {
        public function test() {
            Config::get('app.name');

        }
    }

Updated answer

Please add below line in config/app.php in aliases section

'Config' => Illuminate\Support\Facades\Config::class,

then run below command

php artisan config:cache
php artisan cache:clear