Adopt monorepo structure

[jtpio]

Adopt a monorepo structure with lerna to streamline the build process, and align the setup with current practices also used in other repos.

This makes it easier to build the packages with a single streamlined workflow:

jlpm
jlpm run build

This is in preparation for switching to TypeScript for the Voila frontend, and to the lab 3 based frontend later on.

TODO

• Strict null checks
• Lint check on CI
• Simplify setup.py
• Update contributing guide
• Lint packages/voila

[jtpio]

cc @martinRenou if you want to review, since you've also been looking at similar structures and build systems recently.

The idea would be to merge this PR first before migrating to TypeScript for the Voila frontend.

[martinRenou]

Sorry I missed the notification, LGTM 👍🏼

[jtpio]

Reverted back to the commit where CI was passing: 0108d27:

Need to investigate why the Voila tests suddenly started to fail now.

[jtpio]

e0be580 should fix #755

[jtpio]

Recreating an environment from scratch and rerunning the tests locally with python -m pytest seems to work fine:

However, running with VOILA_TEST_DEBUG=1 VOILA_TEST_XEUS_CLING=1 python -m pytest yields similar errors as on CI:

[jtpio]

Looks like this might have to do with the recent 0.6.24 release of xtl published yesterday:

As downgrading to 0.6.23 seems to fix it:

voila-tests-xtl-0-6-24.mp4

[jtpio]

Tests are green again with the pin to xtl=0.6.23 in 1372b45

[JohanMabille]

I think it's fine to pin to xtl=0.6.23 for now. The xeus-cling stack must be rebuilt so it uses the same standard lib as the last xtl

[jtpio]

I think it's fine to pin to xtl=0.6.23 for now. The xeus-cling stack must be rebuilt so it uses the same standard lib as the last xtl

OK sounds good, thanks for the heads-up 👍

We can open a new issue to remember to unpin at some point in the future.

[jtpio]

Thanks Martin and Johan!

Looks good now, so we can merge and iterate in follow-up PRs.

[jtpio]

Opened #812 to keep track of the unpin.