Prepare relase 4.0.0

[krassowski]

References

Closes #908, closes #742, workarounds #911.

Code changes

• Bump version of server extension to 2.0
• Require Python 3.8
• Use only Node 16 for development
• Update tests for JupyterLab 3.6
• Only support JupyterLab 3.6

User-facing changes

Backwards-incompatible changes

Chores

• linted
• tested
• documented
• changelog entry

[github-actions]

👈 Launch a binder notebook on branch krassowski/jupyterlab-lsp/maintenance

[bollwyvl]

Only support JupyterLab 3.6

Of note on this: we won't be able to continue "lsp in the browser" work for a while, with a hard dep on lab 3.6, due to the breaking changes from 3.5 (e.g. yjs) (vs jupyterlite/jupyterlite-lsp#1). Probably fine, pretty slammed as it is.

No doubt some time in the 4.x-beta timeline, we'll have something working.

See also:

• factoring out jupyterlite-pyodide-kernel, making it easier to ship "tricky" packages
  • while getting a JSON/YAML/MD LSP working would still be the first goal,
    • getting something running in-kernel (or at least in-loop) would be pretty great, be it jedi or otherwise
      • for now, just shimming out jedi (and a lot of prompt-toolkit) altogether 😿

[krassowski]

Thanks for the note. It is not a hard dep on 3.6 - just a realistic statement that bugs which are specific to older releases are likely to receive no fixes from us. 3.3+ continuous to work for now, without future guarantees (and is no longer tested on CI).

[krassowski]

But yes install_requires would need to be circumvented to install it on <3.6.