We have many situations when We need register some ServiceProviders only on development version depends on .env file
Ofcourse You can add entry to config/app.php. But on situation when You don't have Provider on production env it throws errors.
This kind of situation can ocures after adding entry to require-dev sectioncomposer.json file.

The solution is very simple and elegant. It saves our time and many trouble.

---

composer.json

For testing purpose add package to composer.json to section require-dev:

"barryvdh/laravel-debugbar": "2.0.*@dev"

then do composer update

Setup ServiceProvider

Setup new ServiceProvider which handle our conditional registering:

php artisan make:provider LocalEnviromentServiceProvider

Add entry to config/app.php

'App\Providers\LocalEnviromentServiceProvider',

Register own local Service Providers

Create property to store entries:

    /**
     * List of Local Enviroment Providers
     * @var array
     */
    protected $localProviders = [
        'Barryvdh\Debugbar\ServiceProvider',
    ];

and method:

    /**
     * Loda local service providers
     */
    protected function registerServiceProviders()
    {
        foreach ($this->localProviders as $provider)
        {
            $this->app->register($provider);
        }
    }

Finally run it on boot() method:

    /**
     * Bootstrap the application services.
     * @return void
     */
    public function boot()
    {
        if ($this->app->isLocal())
        {
            $this->registerServiceProviders();
        }
    }

Other enviroments

If you like to load Providers on different enviroments change:

$this->app->isLocal()

to

$this->app['env'] == 'local'
// Or
$this->app->environment() == 'local'

After that You can change local to other eg. testing.

Register Facade Aliases

Last step We handle is registering Facade Aliases. It's little more complicated but not impossible.

Create property:

    /**
     * List of only Local Enviroment Facade Aliases
     * @var array
     */
    protected $facadeAliases = [
        'Debugbar' => 'Barryvdh\Debugbar\Facade',
    ];

Method:

    /**
     * Load additional Aliases
     * Base file Alias load is /config/app.php => aliases
     */
    public function registerFacadeAliases()
    {
        $loader = AliasLoader::getInstance();
        foreach ($this->facadeAliases as $alias => $facade)
        {
            $loader->alias($alias, $facade);
        }
    }

and run it on our boot() method adding:

$this->registerFacadeAliases();

Final ServiceProvider code

<?php namespace App\Providers;

use Illuminate\Foundation\AliasLoader;
use Illuminate\Support\ServiceProvider;

class LocalEnviromentServiceProvider extends ServiceProvider
{

    /**
     * List of Local Enviroment Providers
     * @var array
     */
    protected $localProviders = [
        'Barryvdh\Debugbar\ServiceProvider',
    ];

    /**
     * List of only Local Enviroment Facade Aliases
     * @var array
     */
    protected $facadeAliases = [
        'Debugbar' => 'Barryvdh\Debugbar\Facade',
    ];

    /**
     * Bootstrap the application services.
     * @return void
     */
    public function boot()
    {
        if ($this->app->isLocal())
        {
            $this->registerServiceProviders();

            $this->registerFacadeAliases();
        }
    }

    /**
     * Register the application services.
     * @return void
     */
    public function register()
    {
    }

    /**
     * Loda local service providers
     */
    protected function registerServiceProviders()
    {
        foreach ($this->localProviders as $provider)
        {
            $this->app->register($provider);
        }
    }

    /**
     * Load additional Aliases
     * Base file Alias load is /config/app.php => aliases
     */
    public function registerFacadeAliases()
    {
        $loader = AliasLoader::getInstance();
        foreach ($this->facadeAliases as $alias => $facade)
        {
            $loader->alias($alias, $facade);
        }
    }
}