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

[stevechanvii]

Just work around and found a temp solution testing by PlayWright:

Go to node_modules/@auth0>nextjs-auth0/package.json
Add following to "exports":

"./testing/generate-session-cookie": {
      "import": "./dist/testing/generate-session-cookie.js",
      "types": "./dist/testing/generate-session-cookie.d.ts",
      "default": "./dist/testing/generate-session-cookie.js"
    }

Go to node_modules/@auth0>nextjs-auth0/dist/testing/generate-session-cookies.js
replace

import { encrypt } from "../server/cookies";

to

import { encrypt } from "../server/cookies.js";

Then patch-package, a temporary solution and still waiting Auth0 find the root issue.

[RichWK]

Hi @tusharpandey13, do you have an update for us on this generateSessionCookie issue? You mentioned on March 7th that:

We'll fix this in our next release

...but as of v4.2.1 (released on March 24th) I'm still able to reproduce the issue. The workaround you provided doesn't seem to work.

This is blocking us from migrating to 4.x, as we cannot proceed without a functioning test suite.

[frederikprijck]

Sorry for the radio silence here, any chance anyone can share a reproduction?

I tried this in my sample application:

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

console.log('Output:');
console.log(generateSessionCookie);

And the following is output:

Output:
[Function: generateSessionCookie]

If anyone can share a minimal reproduction, we can look in addressing this.

[RichWK]

Thanks @frederikprijck, here's a minimal reproduction of the generateSessionCookie issue:

• Repo: https://github.com/RichWK/auth0-subpath-reproduction
• My commit reproducing the issue: RichWK/auth0-subpath-reproduction@9030e19

You can trigger the error by running npm run cypress:open within the Sample-01 directory:

Full stack trace:

Error: Package subpath './dist/testing' is not defined by "exports" in /Users/redacted/Documents/GitHub/auth0-nextjs-samples/Sample-01/node_modules/@auth0/nextjs-auth0/package.json
    at exportsNotFound (node:internal/modules/esm/resolve:322:10)
    at packageExportsResolve (node:internal/modules/esm/resolve:670:9)
    at resolveExports (node:internal/modules/cjs/loader:634:36)
    at Function.Module._findPath (node:internal/modules/cjs/loader:724:31)
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:1211:27)
    at Function.Module._resolveFilename.sharedData.moduleResolveFilenameHook.installedValue [as _resolveFilename] (/Users/redacted/Library/Caches/Cypress/12.17.4/Cypress.app/Contents/Resources/app/node_modules/@cspotcode/source-map-support/source-map-support.js:811:30)
    at Function.Module._load (node:internal/modules/cjs/loader:1051:27)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at require (node:internal/modules/helpers:179:18)
    at Object. (/Users/redacted/Documents/GitHub/auth0-nextjs-samples/Sample-01/cypress.config.js:2:35)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1548:10)
    at Object.require.extensions. [as .js] (/Users/redacted/Library/Caches/Cypress/12.17.4/Cypress.app/Contents/Resources/app/node_modules/ts-node/dist/index.js:851:20)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Function.Module._load (node:internal/modules/cjs/loader:1104:12)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at require (node:internal/modules/helpers:179:18)
    at loadFile (/Users/redacted/Library/Caches/Cypress/12.17.4/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js:89:14)
    at EventEmitter. (/Users/redacted/Library/Caches/Cypress/12.17.4/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/child/run_require_async_child.js:116:38)
    at EventEmitter.emit (node:events:518:28)
    at EventEmitter.emit (node:domain:489:12)
    at process. (/Users/redacted/Library/Caches/Cypress/12.17.4/Cypress.app/Contents/Resources/app/packages/server/lib/plugins/util.js:33:22)

[frederikprijck]

Thanks for sharing that, I was able to get the reproduction working with the following steps:

• Update cypress to 14.2.1
• Add "type": "module" to Sample-01/package.json
• Add "type": "module" to the SDK's package.json (you can do this in node_modules, to test. But we may need to patch this)
• Migrate the crypress config to use ESM and rename to .mjs.

Doing that, allows me to no longer have the error in question. Can you confirm this would help you as well before we look into this any further?

[RichWK]

@frederikprijck I don't think that will help us as we're not in a position to transition our package to ESM at the moment.

[frederikprijck]

v4 of our SDK only ships an ESM bundle, and cypress seems to not like that, as far as I understand it needs that configuration to make it work with any ESM only package.

The fact that this is only a cypress problem, makes me believe that your application is already using ESM ? But I may be missing something.

[frederikprijck]

We detected a potential issue with the way we publish our SDK, will circle back ASAP with a fix.