InertiaJS and SSR

Hello,

I never used SSR and I don't understand the documentation about SSR.

https://inertiajs.com/docs/v3/advanced/server-side-rendering#manual-setup

The Vite plugin reuses your app.js entry point for SSR by default, so no separate file is needed. Most customizations may be handled using the withApp callback.

=> no need to add another file than the base app.js file

https://inertiajs.com/docs/v3/advanced/server-side-rendering#deployment

When deploying your SSR enabled app to production, you’ll need to build both the client-side (app.js) and server-side bundles (ssr.js), and then run the SSR server as a background process, typically using a process monitoring tool such as Supervisor.

=> need to add the SSR file

It's contradictory.

What is really needed ?

Can you help me please ?

Thanks for your help.

V