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Have a look at Sapper, which is a framework built around Svelte that makes the server-side rendering pretty easy. I worked with a next.js SSR project recently and that was an absolute trainwreck, but Svelte/Sapper, while not perfect, is pretty nice.

You have to be a little careful about the interactions if you really care about it working with no JS (e.g. have an on:submit for a form and then also have a server-side route that it can POST to) but it's not too bad really.