Heimdall/vendor/laravel/tinker/config/tinker.php

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Alias Blacklist
    |--------------------------------------------------------------------------
    |
    | Typically, Tinker automatically aliases classes as you require them in
    | Tinker. However, you may wish to never alias certain classes, which
    | you may accomplish by listing the classes in the following array.
    |
    */

    'dont_alias' => [],

];