James HopgoodJ
tRPC•4mo ago•
1 reply
James Hopgood

TS error regarding inferred type of 'appRouter'

Hey there,

I've been running into this issue with my turborepo. I have an api (hono) backend and a nextjs frontend and both rely on tRPC in order to function/make calls. I believe this is an issue with trpc/server and zod? But honestly everything I find online isn't quite right.

I have a pretty standard setup that I think I have used before with no issues. I use Zod in multiple places in my repo but I make sure that they are all the same version. I'm not 100% sure of which code to show so please do ask for anything you need to see in the comments.

- Node 22
- Bun
- Turborepo
- @trpc/server 11.5.1
- zod 4.1.5

The inferred type of 'appRouter' cannot be named without a reference to '../../../../node_modules/zod/v4/core/util.d.cts'. This is likely not portable. A type annotation is necessary.ts(2742)


import type { inferRouterInputs, inferRouterOutputs } from "@trpc/server";
import { router } from "../alt";

export const appRouter = router({...})


import { TRPCError, initTRPC } from "@trpc/server";
import superjson from "superjson";
import type { Context } from "./context";

const t = initTRPC.context<Context>().create({
  transformer: superjson,
  errorFormatter({ shape }) {
    return shape;
  },
});

const isAuthed = t.middleware(({ next, ctx }) => {
  if (!ctx.auth?.userId) {
    throw new TRPCError({ code: "UNAUTHORIZED", message: "Not authenticated" });
  }
  return next({
    ctx: {
      ...ctx,
      auth: ctx.auth,
    },
  });
});

export const router = t.router;
export const publicProcedure = t.procedure;
export const protectedProcedure = t.procedure.use(isAuthed);
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