Laravel Breeze Tutorial LoginRequest.php -- rules

LoginRequest.php

<?php 
// ...

/**
 * Get the validation rules that apply to the request.
 *
 * @return array
 */
public function rules()
{
  return [
    'email' =>
        'required_without:username|string|email|exists:users,email',
    'username' =>
        'required_without:email|string|exists:users,username',
    'password' => 'required|string',
  ];
}