Laravel Breeze Tutorial -- LoginRequest -- authenticate

LoginRequest.php

<?php
/**
 * Attempt to authenticate the request's credentials.
 * @return void
 *
 * @throws \Illuminate\Validation\ValidationException
 */
public function authenticate()
{
  $this->ensureIsNotRateLimited();
  if (!Auth::attempt(
        $this->only($this->loginField, 'password'), 
        $this->boolean('remember')
     )) 
  {
    RateLimiter::hit($this->throttleKey());
    throw ValidationException::withMessages([
      'login' => __('auth.failed')
    ]);
  }
  RateLimiter::clear($this->throttleKey());
}