Testing helper generateSessionCookie error: subpath './testing' is not defined by "exports"

[stevechanvii]

Checklist

• The issue can be reproduced in the nextjs-auth0 sample app (or N/A).
• I have looked into the Readme, Examples, and FAQ and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Description

We are using PlayWrite and need to generate a session by generateSessionCookie, this function can be imported in other files but not in testing files, I got this error:
Error: Package subpath './testing' is not defined by "exports" in /Users/......./node_modules/@auth0/nextjs-auth0/package.json

Some other people also face same error: #1857

Reproduction

Follow this example https://github.com/auth0/nextjs-auth0/blob/main/EXAMPLES.md#generatesessioncookie in testing file

Additional context

No response

nextjs-auth0 version

4.0.2

Next.js version

15.1.6

Node.js version

22.13.0

[tusharpandey13]

Thank you for reporting this issue. This is a bug in our exports configuration - the testing utilities aren't properly exposed in the package.json. We'll fix this in our next release.

The fix adds the proper exports configuration:

"exports": {
  "./testing": {
    "types": "./dist/testing/index.d.ts",
    "default": "./dist/testing/index.js"
  },
  // other existing exports
}

As a temporary workaround, you can use a direct import:

import { generateSessionCookie } from '@auth0/nextjs-auth0/dist/testing';

Please let us know if this solution works for your setup!

[brycenrogers]

Using a direct import appears to result in a similar error

Error: Package subpath './dist/testing' is not defined by "exports"

[stevechan-medi]

Using a direct import appears to result in a similar error

Error: Package subpath './dist/testing' is not defined by "exports"

Same error

[stevechan-medi]

Hey @tusharpandey13 the temp solution not working as well, got error Error: Package subpath './dist/testing' is not defined by "exports"
And v4.1.0 still have original error