[rchl]

install_package_control.sh adds the packages listed by name in extra-packages to Package Control's settings with python3 -B -. A script read from stdin gets the current directory at the start of sys.path, and that directory is usually the package checkout. So a module in the package's root that has the name of a standard library module gets imported instead of it.

In sublimelsp/LSP-elm, types.py breaks import json on macOS (Homebrew Python 3.15), since enum imports types:

  File "/Users/runner/work/LSP-elm/LSP-elm/types.py", line 3, in <module>
    from LSP.protocol import DocumentUri
ModuleNotFoundError: No module named 'LSP'

https://github.com/sublimelsp/LSP-elm/actions/runs/40231054004/job/121282672827

Ubuntu and Windows pass, probably because their Python has already imported types at startup.

-I (isolated mode) leaves the current directory and user site-packages off sys.path and ignores PYTHON* environment variables. The helper only needs the standard library. The PowerShell script doesn't run Python here.