必ず、useStateのinitをしましょう。非同期がやばかった

client

 const App: ISSRApp = ({ context, path }) => {
  return (
    <BrowserRouter>
      <RouterProvider>{RouteConfig}</RouterProvider>
    </BrowserRouter>
  )
}

server

 const App: ISSRApp = ({ context, path }) => {
  return (
    <StaticRouter location={path}>
      <RouterProvider>{RouteConfig}</RouterProvider>
    </StaticRouter>
  )
}