I built a website and deployed it to firebase and everything was rendered correctly. I changed the project architecture to be Server-Side-Rendering, which means that now I run 'server.js' file and not 'index.html'. Is there any way to host my SSR website on firebase without using 'Functions'? I researched the web but couldn't find any other approach.
Firebase Hosting serves only static assets. It does not in any way interpret the files that it servers.
The only way to get the code in interpreted server-side is by linking Firebase Hosting with Cloud Functions, or Cloud Run. If you don't want to do that, there's no way to get SSR on Firebase Hosting.