Completely fails when using preprocessing

[eden-omb]

See this repo for a minimal reproduction, just clone, install, and run tests. Full details for recreating the repo from scratch are included in the README.

The gist of it is, when I use the preprocessing flag, I get the following output:

 FAIL  src/routes/index-dom.spec.js
  ● Test suite failed to run

    TypeError: The "id" argument must be of type string. Received an instance of URL

      at node_modules/.pnpm/svelte-jester@2.1.5_jest@27.4.5+svelte@3.44.3/node_modules/svelte-jester/dist/transformer.cjs:79:118

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        1.534 s, estimated 2 s
Ran all test suites matching /src/i.
 ERROR  Test failed. See above for more details.

[binarious]

I think the problem is NODE_OPTIONS=--experimental-vm-modules when running jest, because the call of svelte-jester in jest.config.js uses the transformer.cjs which uses require and this fails.

My workaround in jest.config.js:

transform: {
  "^.+\\.svelte$": [
    "./node_modules/svelte-jester/dist/transformer.mjs",
    {
      "preprocess": true
    }
  ]
},

[eden-omb]

@binarious Works for me. Leaving this issue open for prosperity until this solution is either unnecessary or documented somewhere more accessible.

[mihar-22]

Should be fixed now 😄 Let us know if you run into any issues.

[binarious]

Maybe that's another bug, but when I change ./node_modules/svelte-jester/dist/transformer.mjs back to svelte-jester I get the following error:

Cannot find module 'file:///home/myuser/projects/myvendor/myapp/svelte.config.js'
Require stack:
- /home/myuser/projects/myvendor/myapp/node_modules/.pnpm/svelte-jester@2.3.1_jest@27.5.0+svelte@3.46.4/node_modules/svelte-jester/dist/transformer.cjs