Laravel application fails when using "config" helper function

I'm trying to load different middleware for differents environments. Something like:

Enable global middleware only for one environment in Laravel 5

I was trying to access to the config params using the config helper function. Code in App/Http/Kernel.php

public function __construct(Application $app, Router $router)
{
    $env = 'devel' ;
    $env = config('app.env');

    if ( $env == 'devel' ) {
        $this->prependMiddleware('\App\Http\Middleware\GlobalConfigDevel');
    }

    parent::__construct($app, $router);
}

but it throws the following exception:

Fatal error: Uncaught exception 'ReflectionException' with message 'Class config does not exist' 

If I comment the line:

//$env=config('app.env');

It works without problem, loading the GlobalConfigDevel middleware. In fact, when using the following route in routes/wep.php (which is using the config helper function), it shows the environment param!!

Route::get('/', function () {
    return dd(config('app.env'));
});

Is there any reason for not using helpers functions inside a constructor??

note: a workaround for this problem is using:

$env = env('APP_ENV', 'devel');

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