full-stack-fastapi-template/frontend/src/routes/__root.tsx

import { createRootRoute, Outlet } from '@tanstack/react-router'
import { TanStackRouterDevtools } from '@tanstack/router-devtools'

import NotFound from '../components/Common/NotFound'

export const Route = createRootRoute({
  component: () => (
    <>
      <Outlet />
      <TanStackRouterDevtools />
    </>
  ),
  notFoundComponent: () => <NotFound />,
})