class MechanicController extends Controller {
  public function getIndex()
  {
    \AjaxResponse::success();
  }
}

{
  code: "0"
  result: {
  }
}

<?php namespace App\Services;
class AjaxResponse {
  protected function ajaxResponse($code, $message, $data = null)
  {
    $out = [
      'code' => $code,
      'message' => $message,
    ];
    if ($data !== null) {
      $out['result'] = $data;
    }
    return response()->json($out);
  }
  public function success($data = null)
  {
    $code = ResultCode::Success;
    return $this->ajaxResponse(0, '', $data);
  }
  public function fail($message, $extra = [])
  {
    return $this->ajaxResponse(1, $message, $extra);
  }
}

<?php namespace App\Providers;
use Illuminate\Support\ServiceProvider;
class AjaxResponseServiceProvider extends ServiceProvider {
  public function register()
  {
    $this->app->singleton('AjaxResponseService', function () {
      return new \App\Services\AjaxResponse();
    });
  }
}

<?php namespace App\Facades;
use Illuminate\Support\Facades\Facade;
class AjaxResponseFacade extends Facade {
  protected static function getFacadeAccessor() { return 'AjaxResponseService'; }
}

<?php
return [
  ...
  'providers' => [
    ...
    'App\Providers\RouteServiceProvider',
    'App\Providers\AjaxResponseServiceProvider',
  ],
  'aliases' => [
    ...
    'Validator' => 'Illuminate\Support\Facades\Validator',
    'View'   => 'Illuminate\Support\Facades\View',
    'AjaxResponse' => 'App\Facades\AjaxResponseFacade',
  ],
];