Which keys Laravel \Illuminate\Routing\Route::$action array could contains ( undocumented - inferred from source )

route-actions-member-allowed-keys.php

<?php

namespace Illuminate\Routing;

class Route
{
  
  /**
   * The route action array.
   *
   * @var array
   */
  public $action = [
    // Types: <string>
    'prefix' => '', // es: admin
    // Types: <string>:name of a function, <string>:"Class@method" style callback , Closure
    'uses' => '',
    'domain'=>'',
    'as'=>'',
    'controller'=>'',
    'middleware'=>'',
    
  ];

  /**
   * Create a new Route instance.
   *
   * @param  array|string  $methods
   * @param  string  $uri
   * @param  \Closure|array  $action  ------>> You can pass these keys like an array
   * @return void
   */
  public function __construct($methods, $uri, $action)
  {

  }
  // ...
}