Cannot assign null to property

im learning livewire form

until chrome said Cannot assign null to property App\Livewire\EditProfile::$user of type App\Models\User

the intelephense keep showing and underline the user() and saying undefined method 'user' on $this-> user = auth()->user();

already tried this https://stackoverflow.com/questions/65042816/undefined-functions-methods-intelephense1013-laravel-homestead-vscode

still stuck the browser keep saying

Cannot assign null to property App\Livewire\EditProfile::$user of type App\Models\User

the component EditProfile

<?php

namespace App\Livewire;

use App\Models\User;
use Livewire\Component;

class EditProfile extends Component
{
    public User $user;
    public $username = '';
    public $bio = '';

    public function mount()
    {

        $this-> user = auth()->user();

        $this->username = $this->user->username;
        $this->bio = $this->user->bio;
    }

    public function render()
    {
        return view('livewire.edit-profile');
    }
}
​