Installing with "[debug-server]" requires Rust

[buurro]

Installing Strawberry via pip install 'strawberry-graphql[debug-server]' (or uv) requires the Rust toolchain to be installed because of libcst:

(...)
running build_ext
running build_rust
error: can't find Rust compiler
(...)
ERROR: Failed building wheel for libcst

I was wondering if libcst is actually needed for the debug server to work.

Tested on macOS x86_64, Python 3.12.9

[buurro]

Trying to run the debug server with the other dependencies installed manually throws the following:

Traceback (most recent call last):
  File "/Users/marco/Documents/projects/uniwhy/.venv/lib/python3.12/site-packages/strawberry/cli/__init__.py", line 5, in <module>
    from .commands.schema_codegen import (
  File "/Users/marco/Documents/projects/uniwhy/.venv/lib/python3.12/site-packages/strawberry/cli/commands/schema_codegen.py", line 7, in <module>
    from strawberry.schema_codegen import codegen
  File "/Users/marco/Documents/projects/uniwhy/.venv/lib/python3.12/site-packages/strawberry/schema_codegen/__init__.py", line 10, in <module>
    import libcst as cst
ModuleNotFoundError: No module named 'libcst'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/marco/Documents/projects/uniwhy/.venv/bin/strawberry", line 4, in <module>
    from strawberry.cli import run
  File "/Users/marco/Documents/projects/uniwhy/.venv/lib/python3.12/site-packages/strawberry/cli/__init__.py", line 17, in <module>
    raise MissingOptionalDependenciesError(extras=["cli"]) from exc
strawberry.exceptions.missing_dependencies.MissingOptionalDependenciesError

[amjha]

I had the similar issue with rust v1.61.0. Upgrading it to v1.85 helped me get rid of this issue.

[erikwrede]

@buurro We could probably add some lazy imports to the CLI so that the command .py files are only initialized if the command is actually called. That might require quite a bit of refactoring though.