Support loadPyodide options

[bollwyvl]

references

• for Investigate new micropip features #40
• part of intent Add Pyodide lockFileURL option #49

code changes

• adds the schema for a subset of loadPyodide(options)
  • some typing for the two initial interesting fields, lockFileURL and packages
• only piplite.install packages that weren't preloaded by loadPyodideOptions.packages
• update example to show use of this for e.g. ssl, matplotlib, etc.

user-facing changes

• site owners will be able to further control the JSON-compatible parts of loadPyodide
• it's possible preloading the packages makes things faster, as they are downloaded while the pyodide VM is starting up

[github-actions]

👈 Try it on ReadTheDocs

[bollwyvl]

Up on RTD, it does indeed look like it preloads packages from the pyodide distribution e.g. matplotlib.

This leads to an (apparently) slower start of the first interactive use of the kernel, so may not desirable for heavyweight packages on general purpose sites, but probably will improve start time when we can skip micropip resolution for all of the ipython deps from a fully-locked environment provided in loadPyodideOptions.lockFileURL.

[jtpio]

Thanks!

[tomjakubowski]

This is awesome! Is it expected to make it in the upcoming 0.3.0 kernel release?

[jtpio]

0.3.0 is now available: https://github.com/jupyterlite/pyodide-kernel/releases/tag/v0.3.0