error - ReferenceError: Cannot access 'createTRPCRouter' before initialization

Anyone ever experience an error as in title of this Q. src\server\api\root.ts

import { createTRPCRouter } from "./trpc";
import { exampleRouter } from "./routers/example";
import { roleRouter } from "./routers/role";
export const appRouter = createTRPCRouter({
  example: exampleRouter,
  role: roleRouter,
  .....
})

import { createTRPCRouter } from "./trpc";
import { exampleRouter } from "./routers/example";
import { roleRouter } from "./routers/role";
export const appRouter = createTRPCRouter({
  example: exampleRouter,
  role: roleRouter,
  .....
})

If you change import order and move roleRouter import at top, it will throw error at roleRouter in below error description. Error Description:

{"props":{"pageProps":{"statusCode":500}},"page":"/_error","query":{"__NEXT_PAGE":"/api/trpc/auth.getSecretMessage,auth.getAllPermissions"},"buildId":"development","isFallback":false,"err":{"name":"ReferenceError","source":"server","message":"Cannot access 'createTRPCRouter' before initialization","stack":"ReferenceError: Cannot access 'createTRPCRouter' before initialization\n    at Module.createTRPCRouter (webpack-internal:///(api)/./src/server/api/trpc.ts:5:65)\n    at eval (webpack-internal:///(api)/./src/server/api/routers/example.ts:12:61)"},"gip":true,"locales":["en"],"scriptLoader":[]}

{"props":{"pageProps":{"statusCode":500}},"page":"/_error","query":{"__NEXT_PAGE":"/api/trpc/auth.getSecretMessage,auth.getAllPermissions"},"buildId":"development","isFallback":false,"err":{"name":"ReferenceError","source":"server","message":"Cannot access 'createTRPCRouter' before initialization","stack":"ReferenceError: Cannot access 'createTRPCRouter' before initialization\n    at Module.createTRPCRouter (webpack-internal:///(api)/./src/server/api/trpc.ts:5:65)\n    at eval (webpack-internal:///(api)/./src/server/api/routers/example.ts:12:61)"},"gip":true,"locales":["en"],"scriptLoader":[]}

16 Replies

JacobMGEvans•2y ago

The error message "Cannot access 'createTRPCRouter' before initialization" suggests that the function is being called before it has been properly initialized. This could be caused by a variety of issues in the code, such as a missing import statement, a circular dependency, or a lack of proper initialization logic. What have you done to look into this before posting?

vilchy ✓•2y ago

Currently having same problem. It disappears after doing any change in any file and saving it. But when I rerun the project it comes back.

vilchy ✓•2y ago

Here is how browser shows my error

nimeshvaghasiyaOP•2y ago

I have look into https://github.com/trpc/trpc/issues/3081 trpc repo. issue but coudn't figure out exact issue. It returns me 500 error with text/html response. I'm signing in using nextauth discord/google provider, and redirecting user to callbackUrl (dashboard), then calling some trpc routes to get permissioned navigation menu items. but trpc throws 500 with html text response.

GitHub

httpLink/httpBatchLink on fetch redirect · Issue #3081 · trpc/trpc

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JacobMGEvans•2y ago

Not sure how that issue relates. You may need to provide a repro with that error message (the imports dont count as a repro) & the steps to reproduce. https://stackoverflow.com/help/minimal-reproducible-example

Stack Overflow

How to create a Minimal, Reproducible Example - Help Center

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vilchy ✓•2y ago

i found the line that causes the error but idk how else should i tackle this issue. So i wanted only approved accounts to log in so i made a signin callback which calls trpc to check if requesting user is approved (sort of a whitelist).

 async signIn({ user }) {
      // If the user is not verified, don't let them sign in
       const ctx =  createInnerTRPCContext({ session: null });
       const caller = usersRouter.createCaller(ctx);
      const data = await caller.isApproved({ id: user.id });
      if (!data?.verified) {
        return false;
      } else {
        return true;
      }
    },

 async signIn({ user }) {
      // If the user is not verified, don't let them sign in
       const ctx =  createInnerTRPCContext({ session: null });
       const caller = usersRouter.createCaller(ctx);
      const data = await caller.isApproved({ id: user.id });
      if (!data?.verified) {
        return false;
      } else {
        return true;
      }
    },

JacobMGEvans•2y ago

If you change import order and move roleRouter import at top, it will throw error at roleRouter in below error description.

import { createTRPCRouter } from "./trpc"; Likely needs to be first to initialize the Router, import order can matter.

vilchy ✓•2y ago

const caller = usersRouter.createCaller(ctx);

const caller = usersRouter.createCaller(ctx);

JacobMGEvans•2y ago

I am getting a feeling this is a different issue

vilchy ✓•2y ago

without this line, it works I needed to put import of createInnerTRPCContext above import of usersRouter in [...nextauth].ts now it works form me thanks for guiding me on the badly ordered imports trope

JacobMGEvans•2y ago

lol

nimeshvaghasiyaOP•2y ago

I have found exact issue which is causing an error. you can't use "createTRPCContext" inside next auth signIn callback even if you wrap auth options to access NextApiRequest and NextApiResponse, I need to wrap it because i need some cookie values. Using "createInnerTRPCContext" does fix an error:
const ctx = await createInnerTRPCContext({ session: null }); const caller = appRouter.createCaller(ctx);
const ctx = await createInnerTRPCContext({ session: null }); const caller = appRouter.createCaller(ctx);
Code (signIn callback lines produce unusual error as mentioned in title):

export const authOptions = (req: NextApiRequest | undefined = undefined, res: NextApiResponse | undefined = undefined): NextAuthOptions => {
  return {
    callbacks: {
      async signIn({ user, account, profile, email, credentials }) {
         const ctx = await createTRPCContext({ req, res });
         const caller = appRouter.createCaller(ctx);
         caller.role.getAllPermissions({...})
         ...
      }
    }
    ...
  }
};

// export default NextAuth(authOptions);
export default (req: NextApiRequest, res: NextApiResponse) => {
  return NextAuth(req, res, authOptions(req, res))
}

export const authOptions = (req: NextApiRequest | undefined = undefined, res: NextApiResponse | undefined = undefined): NextAuthOptions => {
  return {
    callbacks: {
      async signIn({ user, account, profile, email, credentials }) {
         const ctx = await createTRPCContext({ req, res });
         const caller = appRouter.createCaller(ctx);
         caller.role.getAllPermissions({...})
         ...
      }
    }
    ...
  }
};

// export default NextAuth(authOptions);
export default (req: NextApiRequest, res: NextApiResponse) => {
  return NextAuth(req, res, authOptions(req, res))
}

@0𝙚𝙪𝙚 ✓ @JacobMGEvans Do you think using "createTRPCContext" anywhere should not cause any issue?

nimeshvaghasiyaOP•2y ago

I have created latest create t3 app: https://github.com/nimeshvaghasiya/t3routererror Steps to reproduce error: - Clone above repository, do npm install then npm run dev - Click on "Roles" - Click on "Sign in" button : throws error - If you comment out signin callback, there will be no error. @JacobMGEvans @0𝙚𝙪𝙚 ✓ I would like to open an issue to t3app github repo, if someone can confirm this is a real issue.

GitHub

GitHub - nimeshvaghasiya/t3routererror

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JacobMGEvans•2y ago

Just open an issue, if its not an issue to them they will tell you.

Stivo•2y ago

Any updates? I'm having the same issue

nimeshvaghasiyaOP•2y ago

@Stivo please refer this: https://github.com/t3-oss/create-t3-app/issues/1093

GitHub

bug: error - ReferenceError: Cannot access 'createTRPCRouter' befor...

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error - ReferenceError: Cannot access 'createTRPCRouter' before initialization