Error importing rdfjs with jest

MMesch commented 3 weeks ago

I'm running into a problem using rdfjs types together with the jest testing framework. The jest resolver can't find "@rdfjs/types" when it's imported in some library. When I edit the @rdfjs/types/package.json file adding "main" : "index.d.ts", it can then find the package but it throws an error when importing the relative imports within that package.

Disclaimer: I'm not super experienced with typescript.

The error I am running into is:

➜ npm test

> minimal-rdfjs-jest@1.0.0 test
> node --experimental-vm-modules node_modules/jest/bin/jest.js

 FAIL  src/index.test.ts
  ● Test suite failed to run

    Cannot find module '@rdfjs/types' from 'src/index.ts'

      at Resolver._throwModNotFoundError (node_modules/jest-resolve/build/resolver.js:427:11)

I uploaded a minimal example to reproduce here: https://github.com/MMesch/minimal-rdfjs-jest

Any ideas what could cause this and how to fix or workaround?

MMesch commented 3 weeks ago

Importing other packages seems to work fine (I added chalk in the example to demonstrate).

tpluscode commented 3 weeks ago

No code exists in the package @rdfjs/types. Try type-only import

import type * as rdfjs from '@rdfjs/types';

MMesch commented 3 weeks ago

Great that works! Thank you very much for the quick help.

I exchanged: import {type Quad, type ResultStream} from '@rdfjs/types'; with import type {Quad, ResultStream} from '@rdfjs/types'; and that did the trick.

I was extra confused because building, the language server and everything else worked well otherwise. Only jest bugged.

rdfjs / types

Error importing rdfjs with jest #43