One BusServiceProvider is enough

src/Bus/BusServiceProvider.php

@@ -12,17 +12,27 @@
 namespace Flarum\Bus;
 
 use Flarum\Foundation\AbstractServiceProvider;
-use Illuminate\Contracts\Bus\Dispatcher as BusContract;
+use Illuminate\Bus\Dispatcher as BaseDispatcher;
+use Illuminate\Contracts\Bus\Dispatcher as DispatcherContract;
+use Illuminate\Contracts\Bus\QueueingDispatcher as QueueingDispatcherContract;
 use Illuminate\Contracts\Queue\Factory as QueueFactoryContract;
 
 class BusServiceProvider extends AbstractServiceProvider
 {
     public function register()
     {
-        $this->app->bind(BusContract::class, function ($app) {
+        $this->app->bind(BaseDispatcher::class, function ($app) {
             return new Dispatcher($app, function ($connection = null) use ($app) {
                 return $app[QueueFactoryContract::class]->connection($connection);
             });
         });
+
+        $this->app->alias(
+            BaseDispatcher::class, DispatcherContract::class
+        );
+
+        $this->app->alias(
+            BaseDispatcher::class, QueueingDispatcherContract::class
+        );
     }
 }