NextJs build SSR instead of Static page when tRPC ssr is true

[codart1]

I tried to implement tRPC on my NextJs project. Everything works well except when I try to run next build. It emits:

As you can see, I expect pages like /404, /register, '/test'... to be static but they actually SSR.
I tried to turn off ssr option in: https://trpc.io/docs/nextjs#ssr-boolean-default-false and try to build again, this time NextJs did build static pages as I expected:

Is that a bug or by design?

[KATT]

This is by design. If you use ssr: true you can't have any pages being "actually" static as the magic relies on getInitialProps.

getInitialProps will disable Automatic Static Optimization.

Might be worth mentioning this in the docs! (Feel free to add a PR!)

Worth noting though is that even if you use getInitialProps you can statically cache your page in Vercel - in tRPC you can read how to achieve that in this section. There's also a reference example here, which is the source code of typescript.careers.

If you still prefer "real" SSG - you have to omit ssr: true and prefetch data manually - see docs here.

[mmkal]

This discussion might be of interest. Seems like a long shot but maybe one day SSR + SSG will be possible: vercel/next.js#11424