[Error [TurbopackInternalError]: Expected to find module

[pamartn]

Hi,

I just installed yak version 4.1.1 with NextJS 15.1.7.

I got an error while running npm run dev.

Does someone know how to fix it ?

My best guess is that there is dependency version problem.
Maybe because my NextJS or React version is too new ?

I also tried npm run ci.

Thanks !

The error :

> [email protected] dev
> next dev --turbopack

 ⚠ Port 3000 is in use, trying 3001 instead.
   ▲ Next.js 15.1.7 (Turbopack)
   - Local:        http://localhost:3001
   - Network:      http://192.168.1.243:3001
   - Experiments (use with caution):
     · turbo
     · swcPlugins

 ✓ Starting...
[Error [TurbopackInternalError]: Expected to find module

Debug info:
- Execution of *get_written_endpoint_with_issues failed
- Execution of *MiddlewareEndpoint::new failed
- Execution of Project::middleware_context failed
- Execution of *NextEcmascriptClientReferenceTransition::new failed
- Execution of *FullContextTransition::new failed
- Execution of *ModuleAssetContext::new failed
- Execution of get_client_module_options_context failed
- Expected to find module]

My next config :

import type { NextConfig } from "next";
import { withYak } from "next-yak/withYak";

const nextConfig: NextConfig = {
  webpack: (config) => {
    config.module.rules.push({
      test: /\.po$/,
      type: 'json',
      use: [
        {
          loader: '@lingui/loader',
          options: {
            sourceLocale: 'en'
          }
        }
      ]
    });
    return config;
  },
  experimental: {
    swcPlugins: [['@lingui/swc-plugin', {}]],
    turbo: {
      rules: {
        '*.po': {
          loaders: ['@lingui/loader'],
          as: '*.js'
        }
      }
    }
  }
}
export default withYak(nextConfig);

My package.json :

 "dependencies": {
    "@lingui/core": "^5.2.0",
    "@lingui/loader": "^5.2.0",
    "@lingui/macro": "^5.2.0",
    "@lingui/react": "^5.2.0",
    "negotiator": "^0.6.3",
    "next": "15.1.7",
    "next-yak": "^4.1.1",
    "react": "^19.0.0",
    "react-dom": "^19.0.0"
  },
  "devDependencies": {
    "@eslint/eslintrc": "^3",
    "@lingui/cli": "^5.2.0",
    "@lingui/swc-plugin": "^5.1.0",
    "@types/negotiator": "^0.6.3",
    "@types/node": "^20",
    "@types/react": "^19",
    "@types/react-dom": "^19",
    "eslint": "^9",
    "eslint-config-next": "15.1.7",
    "typescript": "^5"
  }

[Mad-Kat]

Hey @pamartn

Thanks for opening this issue. Is it right that you use turbopack?

Unfortunately at the moment this only works for next.js without turbopack, but we're trying our best to make it possible. See for example here

[pamartn]

Hi @Mad-Kat

I disabled turbopack and it works, awesome, thank you so much !!

[Mad-Kat]

Thank you for the update. If you have any other problems or question feel free to ask and open issues. We're always happy to help

[jantimon]

currently we are blocked by this issue - once vercel adds virtual modules to turbopack we will try once again:

vercel/next.js#74825

[Mad-Kat]

We've created a tracking issue for turbopack

#336

Feel free to watch it in order to get notified when we're able to support turbopack