Breaking changes in version 6 mean Jose can no longer be tested with Jest

[Bazzer588]

Using NodeJS v22.14.0, server side application

Jose works fine, but Jest complains

SyntaxError: Unexpected token 'export'

({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){export class JOSEError extends Error {
                                                                                      ^^^^^^

Unfortunately we have a lot of tests written in Jest
Can you suggest a way forward?

[panva]

It is likely your build/bundle/preprocess/test process configuration is expecting only CJS modules. I cannot advise with these kinds of issues, please follow up in jest's issue tracker. ESM modules are fairly standard and Jest surely supports it, if not, time to get off this horrible test runner (which is not made for Node.js server side testing and frequently messes up exposed process globals).

[panva]

FWIW following what seems like outdated guidance allows me to test ESM with jest (including jose), confirming this to be a setup/tooling issue.

gh gist clone 703317cf3816111ca9cf4e6b93755bd2 example
cd example
npm install
npm run jest

 PASS  ./sign.test.js
  ✓ signs a JWT (4 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        0.089 s
Ran all test suites.

[Bazzer588]

Many thanks panva will try this out