adrema/app/Providers/AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        JsonResource::withoutWrapping();

        \Inertia::share('search', request()->query('search', ''));

        RedirectResponse::macro('success', function($flash) {
            session()->flash('flash', ['success' => $flash]);

            return $this;
        });

    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }
}