[5.7] Add Facade::resolved() method to register pending callback until the service is available.

[crynobone]

Laravel by default shipped with Illuminate\Foundation\Application::registerConfiguredProviders() to ensure Illuminate namespace service provider will be loaded first before package discovery, however if a developer for example override Illuminate\Auth\AuthServiceProvider and then include laravel/passport which uses Auth::extend() the developer will faced the following error:

Unresolvable dependency resolving [Parameter #0 [ <required> $app ]] in class Illuminate\Support\Manager

This can be avoided if package discovery wait until the requested service is be resolved before trying to do anything with it, so I'm proposing the following to be implemented:

Before

    /**
     * Register the token guard.
     *
     * @return void
     */
    protected function registerGuard()
    {
        Auth::extend('passport', function ($app, $name, array $config) {
            return tap($this->makeGuard($config), function ($guard) {
                $this->app->refresh('request', $guard, 'setRequest');
            });
        });
    }

After

    /**
     * Register the token guard.
     *
     * @return void
     */
    protected function registerGuard()
    {
        Auth::resolved(function ($auth) {
            $auth->extend('passport', function ($app, $name, array $config) {
                return tap($this->makeGuard($config), function ($guard) {
                    $this->app->refresh('request', $guard, 'setRequest');
                });
            });
        });
    }

Signed-off-by: Mior Muhammad Zaki crynobone@gmail.com