PavidR•4mo ago

Correct tRPC implementation (NextJS AppDir)

Hello ! I'm a little bit lost on the tRPC examples, especially on "examples-next-app-dir" When should I use this : https://github.com/trpc/examples-next-app-dir/blob/main/src/trpc/server-http.ts over this ? https://github.com/trpc/examples-next-app-dir/blob/main/src/trpc/server-invoker.ts and this ? https://github.com/trpc/examples-next-app-dir/blob/main/src/trpc/rq-server.ts

GitHub

examples-next-app-dir/src/trpc/server-http.ts at main · trpc/exampl...

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GitHub

examples-next-app-dir/src/trpc/server-invoker.ts at main · trpc/exa...

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GitHub

examples-next-app-dir/src/trpc/rq-server.ts at main · trpc/examples...

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26 Replies

Hobbs•3mo ago

Hey @PavidR I'm in the exact same boat as you - curious if you made a decision/any progress since you posted this 12 hours ago?

PavidR•3mo ago

I went with the T3 app implementation, using the hydration helpers from react-query/rsc package But I’m still wondering how this work. I’m doing queries in RSC, but still experiencing loading times. I’ve seen no difference whatsoever between implementations Let me know what you picked !

Hobbs•3mo ago

Awesome, thank you for sharing! I can probably help with the loading times if you want to minimize or simulate it being instantaneous. Curious - do you have to do a trpc server / client implementation? Meaning a separate procedure/instance if you want to use trpc to make requests on the server side vs client?

PavidR•3mo ago

Yes, there are 2 different way to use tRPC depending if RSC/server or client If I got your question right :kekw2:

Hobbs•3mo ago

Yeah that's my understand I guess just figuring out which pattern to use is the tricky part

PavidR•3mo ago

for RSC/server there are 3 different ways ...That's...Confusing, not to say the least

Hobbs•3mo ago

What's confusing to me is in the pages router you'd have a withTRPC that wraps the app router / App itself In app directory from what I understand is we create that kind of psuedo provider and combine it with a query provider to wrap the application and both of those use local state for the queryClient/trpcClient

PavidR•3mo ago

yeah that's it I've never looked into the withTRPC hoc code

Hobbs•3mo ago

So i'm basically importing my trpc from /utils/trpc.ts then using that to make my requests however I have no clue how you would differentiate this from a server vs client (i'm using the createTRPCNext method , does this handle if it's client vs server on it's own or did you by any chance go down the rabbit hole of setting up a createCallerFactory? haha I haven't even gone down the ssr/ssg options yet. I have requests working I just feel it's pretty verbose on distinguishing which caller to use depending on server/client

PavidR•3mo ago

Honestly all of this is so not documented that, you should trust maintainers implementations, like in T3 and be as flexible as possible in case of API changes

Hobbs•3mo ago

agreed yup

PavidR•3mo ago

honestly, 50% of the time I feel bad to use TRPC

Hobbs•3mo ago

Are you familiar with react query?

PavidR•3mo ago

because I don't understand half of it I get the broad picture, but not the fine details

Hobbs•3mo ago

For the loading times it sounds like it has to do with your refetchInterval/staleTime If you are using the hydration pattern you can preFetch/PreHydrate your data as well and that can make it appear quicker

PavidR•3mo ago

I think yeah, that's what I've to do but its not really documented

Hobbs•3mo ago

I can help you out with that stuff if you want to have more granularity on when you are fetching/populating Yeah I really recommend the ui.dev react query course, its a little expensive but it helped me out heaps

PavidR•3mo ago

I display a list of questions, when clicking the question I'm redirected to a page where I display the single question and the loading happens the

app/questions/[id]/page.tsx

app/questions/[id]/page.tsx

is doing the RSC tRPC call and I pass down the initialData to my <Question /> component and inside the Question component, I use the tRPC CLIENT stuff, passing initialData from props so when I'm doing mutations etc, I benefit of the ReactQuery stuff, like optimistic UI etc

Hobbs•3mo ago

Yeah that sounds like a good pattern to use. Maybe think about if you want the fetch to occur on the parent level and then render the component conditionally or if you want to render the component Another thing to note is that if you are using server actions that those can't run in parallel (you might want to double check to confirm) but I recall that being the case. So basically I try to stick to using server actions only for mutations also keep in mind that RSC are different than a server action

PavidR•3mo ago

nah I don't use server actions because I need every part of my API to be usable on a React Native app, later on 👍

Hobbs•3mo ago

oh great then hmm, im not sure why the load times would be exagerated with trpc

PavidR•3mo ago

and I don't want to maintain : an API + bunch of server actions that do the same thing

Hobbs•3mo ago

if anything you should see some optimizations what with the batching/deduping and stuff that rq has out of the box for trpc to leverage

PavidR•3mo ago

I mean, maybe the little loading times are normal/OK is there a way to see the timeline of a RSC ? from call to render, times etc ?

Hobbs•3mo ago

This has been a big trip for me, its too easy for duplicate actions to exist. It's too easy to fall into the pattern of creating a hook, to make a trpc call, to use a server action Yup do you have the tanstack devtools installed? If your layout/provider looks like this, you can add it in like so:

  return (
    <trpc.Provider client={trpcClient} queryClient={queryClient}>
      <QueryClientProvider client={queryClient}>
        <ReactQueryDevtools initialIsOpen={false} />
        {children}
      </QueryClientProvider>
    </trpc.Provider>
  );

  return (
    <trpc.Provider client={trpcClient} queryClient={queryClient}>
      <QueryClientProvider client={queryClient}>
        <ReactQueryDevtools initialIsOpen={false} />
        {children}
      </QueryClientProvider>
    </trpc.Provider>
  );

PavidR•3mo ago

Yeah OK thanks, but that doesn't exist for RSC but its late here in EU, gonna sleep and see this tomorrow ! thanks have a good one well @Hobbs I opted for prefetching in server components and leveraging useSuspenseQuery hook in client components + HydrateClient does wonders, for now