[2.6.0] jest can't resolve lerna dependencies (sym links)

[bitflower]

Stencil version:

 @stencil/core@2.0.3

I'm submitting a:

[x] bug report
[ ] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://stencil-worldwide.herokuapp.com/ or https://forum.ionicframework.com/

Current behavior:
Currently jest has issues resolving internal lerna-sym-linked packages. They work during normal build (both dev and prod). After researching and trying many possible workarounds I wonder if I have to switch to another test runner. However Stencil is closely tied to jest.

Would appreciate any help here!

Findings that make me believe that jest maintainers are not too keen on making sym links work better:
jestjs/jest#1477

Things I have tried:

• custom resolver: https://gist.github.com/gcangussu/af52da296aef829eba15ea626453f031
• moduleNameMapper, e.g.: Paths not being resolved. Cannot find module X from Y kulshekhar/ts-jest#269
• transformIgnorePatterns : https://jaketrent.com/post/jest-on-lerna-repo/
• artificial jest config at the root and inherited folder structure: Guide to use Jest with Lerna jestjs/jest#3112

Expected behavior:
Tests run fine.

Related code:
Repo that re-produces the error scenario: https://github.com/bitflower/stencil-lerna-tests

[bitflower]

Tried -22 quickly, unfortunately not solved:

[bitflower]

Ok, updated the repo to use latest 1.9.1 and --next.

[bitflower]

Also added a branch which directly calls jest as discussed in the contributors chat. It can be found here:
https://github.com/bitflower/stencil-lerna-tests/tree/jest-directly

It returns the same error:

[bitflower]

Just tried this again with Stencil 2.0.3 but it's still uncapable of resolving lerna sym linked packages in my components.

[bitflower]

@rwaskiewicz @splitinfinities Hey guys! This is still a thing in the recent version 2.6.0. Any chance this can be looked at anytime soon? Let me know if I can provide anything more then the above repo. Thanks!

https://github.com/bitflower/stencil-lerna-tests

[bitflower]

Good news: I've fixed the issue with jest not being able to resolve the symlinked lerna packages.

Commit: bitflower/stencil-lerna-tests@56e3b49

Still open: transform of imported sub-packages:

Explanation: pkg2 imports pkg1

[splitinfinities]

Duplicate of #2648

If you can share all their learnings in that issue, I would appreciate it.