Heimdall/app/Http/Middleware/RedirectIfAuthenticated.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class RedirectIfAuthenticated
{
    /**
     * Handle an incoming request.
     *
     * @param Request $request
     * @param  Closure  $next
     * @param string|null $guard
     * @return mixed
     */
    public function handle(Request $request, Closure $next, string $guard = null)
    {
        if (Auth::guard($guard)->check()) {
            return redirect()->intended();
        }

        return $next($request);
    }
}