Switch to a federated serverlite extension

[jtpio]

Continue the switch to a federated serverlite extension:

• Support federated serverlite extensions jupyterlite#104
• Scaffolding for loading serverlite extensions jupyterlite#352

TODO

• Switch back to 0.1.0-alpha.x versioning
• Add liteExtension key to the package.json to indicate this is not a regular lab extension
• Fix CI
• Fix releaser config
• Add docs to the readme
• Rename Python package to jupyterlite-p5-kernel?
• Book name on PyPI: https://pypi.org/project/jupyterlite-p5-kernel/

[bollwyvl]

Just thinking out loud: the happy path might be:

• labextension build
  • puts stuff in p5_kernel/labextension
• setup.py sdist bdist_wheel
  • puts stuff in $CRAZYTOWN/share/jupyter/labextensions
• pip install jupyterlite-p5-kernel
  • puts stuff in $PREFIX/share/jupyter/labextensions
• jupyter lite build
  • finds it
    • add to federated_extensions
    • looks in package.json
      • find it's a serverlite_extension
        • add to lite_extensions
• at run-time
  • hand to the JupyterBackEndApplication
  • don't hand to the JupyterFrontentEndApplication

easy, right!?

[bollwyvl]

blearg, how many times have i written this 🤣

[bollwyvl]

import { JavaScriptKernel } from '@jupyterlite/javascript-kernel'

Should we also sharedPackage for @jupyterlite/javascript-kernel, at least for the time being?

[jtpio]

Should we also sharedPackage for @jupyterlite/javascript-kernel, at least for the time being?

Yes sounds good 👍 At least if we continue shipping it by default. Otherwise it would be using its own copy of @jupyterlite/javascript-kernel which should also be fine for now.

[jtpio]

Just thinking out loud: the happy path might be:

Yes, which should almost correspond to the current state of jupyterlite/jupyterlite#352.

I'll finish this PR and cut a first release of p5-kernel-lite to PyPI so we can test on jupyterlite/jupyterlite#352

For the name of the federated kernel, we could go for:

• jupyterlite-p5-kernel
• p5-kernel-lite

The second sounds good, but would be fine with the first one too. Later we can imagine having xeus-lua-lite which might look better than jupyterlite-xeus-lua.

[jtpio]

The second sounds good, but would be fine with the first one too

jupyterlite-p5-kernel is actually similar to what many lab extensions have been using (jupyterlab-myextension). So going with that name would also be fine.

[jtpio]

Should be good to go for a first iteration. We can iterate in follow-up PRs.