InertiaServiceProvider.php

<?php

namespace App\Providers;

use Inertia\ServiceProvider;
use Illuminate\Http\Request;

class InertiaServiceProvider extends ServiceProvider
{
    /**
     * The root template that's loaded on the first page visit.
     *
     * @see https://inertiajs.com/server-side-setup#root-template
     * @var string
     */
    protected $rootView = 'app';

    /**
     * Determines the current asset version.
     *
     * @see https://inertiajs.com/asset-versioning
     *
     * @return string|null
     */
    public function version(Request $request)
    {
        return parent::version($request);
    }

    /**
     * Defines the props that are shared by default.
     *
     * @see https://inertiajs.com/shared-data
     *
     * @return array
     */
    public function share(Request $request)
    {
        return array_merge(parent::share($request), [
            // your data
        ]);
    }
}