"Cannot find module" in yarn monorepo setup

[epicbytes]

Version

5.14.0

Describe the bug

Hi! I ran into a problem when using turborepo, if the module is added to one application, then everything works as it should. But when added to the second, the module starts to give an error when both are started.

Applications are written in NextJS.

Both times the module is connected and initialized according to the instructions.

Reproduction

install module
auto setup module
connected this to one more application in turborepo

Logs

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/Volumes/WORK/website/apps/admin/node_modules/typesafe-i18n/react' imported from /Volumes/WORK/website/apps/admin/.next/server/pages/_app.js
Did you mean to import typesafe-i18n/react/index.cjs?
    at new NodeError (node:internal/errors:387:5)
    at finalizeResolution (node:internal/modules/esm/resolve:404:11)
    at moduleResolve (node:internal/modules/esm/resolve:965:10)
    at defaultResolve (node:internal/modules/esm/resolve:1173:11)
    at nextResolve (node:internal/modules/esm/loader:173:28)
    at ESMLoader.resolve (node:internal/modules/esm/loader:852:30)
    at ESMLoader.getModuleJob (node:internal/modules/esm/loader:439:18)
    at ESMLoader.import (node:internal/modules/esm/loader:536:22)
    at importModuleDynamically (node:internal/modules/cjs/loader:1059:29)
    at importModuleDynamicallyWrapper (node:internal/vm/module:438:21) {
  code: 'ERR_MODULE_NOT_FOUND',
  page: '/'
}

Config

{
   "adapter": "react",
   "$schema": "https://unpkg.com/typesafe-i18n@5.14.0/schema/typesafe-i18n.json",
   "baseLocale": "en"
}

Additional information

No response

[ivanhofer]

Hi @epicbytes can you share the repository?

[epicbytes]

https://github.com/epicbytes/sample-bug

This is a monorepo recreated from scratch.
cd /apps/web and run yarn dev, then try to open it in browser

[ivanhofer]

I tried the example in StackBlitz and it works when adding a default value on this line

https://github.com/epicbytes/sample-bug/blob/main/apps/web/src/pages/index.tsx#L17

-const locale = context.locale as Locales;
+const locale = context.locale as Locales || baseLocale;

[epicbytes]

Unfortunately, this does not solve the problem, the error, as I understand it, is that the module does not find itself in the node_modules folder, which is located next to the application, because turborepo has its own shared directory at the root level of the monorepository. at the same time, typesafe tries to write exactly in node_modules next to the project, but does not see its code in it.

The problem arises precisely in the fact that the module is confused among the directories.

[ivanhofer]

I was now finally able to reproduce your issue.
I don't think this has anything to do with turbo.
It seems like an issue with yarn and how it installs dependencies in a monorepo setup. I haven't looked in detail but it seems that all dependencies are installed at the root node_modules folder. Therefore Next.js is not able to pick up the imports correctly.
I still wonder why other packages can be resolved correctly, but typesafe-i18n not...

Workaround for now: setting the generateOnlyTypes-option to true and manually prefix all typesafe-i18n imports with ../../../../node_modules to the the library where it is actually located.

[ivanhofer]

I have found this issue. It seems the issue is the "hoisting" of packages in yarn.
Changing the workspace config in package.json will fix the issue:

-  "workspaces": [
-    "apps/*",
-    "packages/*"
-  ],
+  "workspaces": {
+    "packages": [
+      "apps/*",
+      "packages/*"
+    ],
+    "nohoist": [
+      "**/typesafe-i18n",
+      "**/typesafe-i18n/**"
+    ]
+  },

[epicbytes]

Thanks, now it works as it should, it would be great to describe it in the documentation.

[ivanhofer]

I'll add a section to the FAQs.

edit: added
https://github.com/ivanhofer/typesafe-i18n#cannot-find-module-in-yarn-monorepo-setup

[ivanhofer]

added: https://github.com/ivanhofer/typesafe-i18n#cannot-find-module-in-yarn-monorepo-setup

[tinwritescode]

@ivanhofer I found the same issue happens on Nx monorepo. Is there anyone have solution?