- Convert class references from strings to static ::class constants built-in to PHP for improved code completion and static analysis.

- Replace Facade references using the global namespace with their FQCN for improved code completion and static analysis.
- delete database\factories\PageFactory.php and app\services\Registrar.php

app/Providers/DoiServiceProvider.php

@@ -33,7 +33,7 @@ class DoiServiceProvider extends ServiceProvider
     public function register()
     {
         //
-        $this->app->singleton('App\Interfaces\DoiInterface', function ($app) {
+        $this->app->singleton(\App\Interfaces\DoiInterface::class, function ($app) {
             return new DoiClient();
         });
     }

app/Providers/EventServiceProvider.php

@@ -11,8 +11,8 @@ class EventServiceProvider extends ServiceProvider
      * @var array
      */
     protected $listen = [
-        'App\Events\Event' => [
-            'App\Listeners\EventListener',
+        \App\Events\Event::class => [
+            \App\Listeners\EventListener::class,
         ],
         \App\Events\Dataset\DatasetUpdated::class => [
             \App\Listeners\DatasetUpdated::class,