Undocumented way to setup route in laravel 5.4 ?

undocumented-laravel-route-setup.php

<?php 

Route::get('/params/{name}', [
    'middleware' => 'App\Http\Middleware\DumpMiddleware',
     function () {
        return view('welcome');
}]);

namespace Illuminate\Routing;

class Route
{
    use RouteDependencyResolverTrait;
    
    /**
     * Create a new Route instance.
     *
     * @param  array|string  $methods
     * @param  string  $uri
     * @param  \Closure|array  $action ---->>> action has been normalize to only Closure or array
     * @return void
     */
    public function __construct($methods, $uri, $action)
    {
        $this->uri = $uri;
        $this->methods = (array) $methods;
        $this->action = $this->parseAction($action);
        
    }
    
}

use LogicException;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use UnexpectedValueException;

class RouteAction
{
    /**
     * Parse the given action into an array.
     *
     * @param  string  $uri
     * @param  mixed  $action
     * @return array
     */
    public static function parse($uri, $action)
    {
        // If no action is passed in right away, we assume the user will make use of
        // fluent routing. In that case, we set a default closure, to be executed
        // if the user never explicitly sets an action to handle the given uri.
        if (is_null($action)) {
            return static::missingAction($uri);
        }

        // If the action is already a Closure instance, we will just set that instance
        // as the "uses" property, because there is nothing else we need to do when
        // it is available. Otherwise we will need to find it in the action list.
        if (is_callable($action)) {
            return ['uses' => $action];
        }

        // If no "uses" property has been set, we will dig through the array to find a
        // Closure instance within this list. We will set the first Closure we come
        // across into the "uses" property that will get fired off by this route.
        elseif (! isset($action['uses'])) {
            $action['uses'] = static::findCallable($action);
        }

        if (is_string($action['uses']) && ! Str::contains($action['uses'], '@')) {
            $action['uses'] = static::makeInvokable($action['uses']);
        }

        return $action;
    }
}


  /**
   * Create a new route instance.
   *
   * @param  array|string  $methods
   * @param  string  $uri
   * @param  mixed  $action ----->> could be an array ????
   * @return \Illuminate\Routing\Route
   */
  // protected function createRoute($methods, $uri, $action)