Update JupyterLab and mystjs extension

[fperez]

Lab 3.6.1 adds RTC support - if the package update goes smoothly, we'll test the actual RTC functionality next.

The mystjs plugin fixes some pretty critical bugs.

[ryanlovett]

@balajialg This is a minor change in terms of configuration, but it will have major consequences as it will enable support for real-time collaboration between users. Excited to see how it turns out.

@fperez To turn on RTC I think it also needs an alteration to the jupyterhub-singleuser command. Did you just want to update lab for now or also enable RTC?

Previously the hub config specified:

  singleuser:
    cmd:
    - jupyterhub-singleuser
    - --LabApp.collaborative=true

The jupyterlab-links-share extension was also enabled. Should these be added as well? Previous related commits:

• 93336ea
• 6b899a4

[balajialg]

@ryanlovett Yes - super excited about this PR. If @fperez has a good time using RTC this semester then folks who expressed interest to use RTC like this will explore RTC next semester (or maybe even earlier)

[ryanlovett]

CI failed with

Encountered problems while solving.
Problem: package jupyterlab-3.6.1-pyhd8ed1ab_0 requires jupyterlab_server >=2.19,<3, but none of the providers can be installed

I've added jupyterlab_server as an explicit dependency (it is available in conda-forge), but I wonder if that will be sufficient to make mamba happy. Let's see.

[ryanlovett]

@fperez I tracked this down to a few conflicts. In a dev environment, besides jupyterlab needing jupyterlab_server==2.19.0, I found:

• jupyterlab_server needs jsonschema==4.17.3
• jsonschema needs altair==4.2.2, and jupyter-book to be removed

After those updates and removing jupyter-book, mamba was happy with the resulting environment. But I'm not sure how important jupyter-book is to your stack, so I haven't modified the PR further.

[ryanlovett]

Regarding jupyter-book, I think we just need jupyter-book/jupyter-book@48fb2fa so I resolved that by using jupyter-book master.

[fperez]

Thanks for tracking this down @ryanlovett! I pinged the JuptyerBook team to see how viable it would be for them to make a quick release so we can work off an official package rather than a git endpoint.

[fperez]

Note @ryanlovett that @choldgraf kindly made a 0.13.2 release just for us! We should be able to update to that from conda-forge shortly, which is wonderful. Huge, huge ❤️ 🙏 to Chris!!

[ryanlovett]

Ah, even better. This has been merged to staging (so you can test there if you want) but I'll prep a new PR once the release is in conda-forge.

[choldgraf]

Just a note that if anybody on this team would be willing to help with Jupyter Book (and its underlying stack) maintenance, I am happy to give commit rights! Those projects are very under-resourced right now, and I won't be around in a few weeks to make releases just before bedtime (I'm expecting baby 2!)

[balajialg]

Hey @choldgraf Congratulations :) that's awesome news! Curious to know the kind of tasks you are expecting the maintainers to perform? I can help out in the interim but not sure whether I could do the technical wizardry that @ryanlovett exhibits.