fs error when deploy project in vercel

[FatimaSalman]

Summary

how i solve the problem

Additional information

No response

Example

No response

[icyJoseph]

Likely happening because you are importing from lib/posts into a Client Module (probably a constant string or something like that), aka that'll be bundled for the browser.

The real fix is to refactor your modules, so that client modules do not import from modules that in turn import Node.js native modules.

However, for whatever reason, this is either difficult to do in some projects, and the typical solution has been to silence the error, and tell webpack to load an empty module in place of fs.

It is also possible to do this with Turbopack. In your case I am going to assume you are migrating to Turbopack, so this section of our upgrade guide: https://nextjs.org/docs/app/guides/upgrading/version-16#resolve-alias-fallback is likely going to help.

That being said, this problem should also be happening locally, in your dev environment. Run next build using your package manager, and this error should happen, apply the either of suggested fixes above, and run the build command again, make sure it builds locally before pushing (just to reduce your feedback cycle length).