ci: use the native libcst parser

noxfile.py

@@ -95,17 +95,32 @@ def slotscheck(session: nox.Session):
 @nox.session(name="codemod")
 def codemod(session: nox.Session):
     """Run libcst codemods."""
+    env = {"LIBCST_PARSER_TYPE": "native"}
     session.run_always("pdm", "install", "-dG", "codemod", external=True)
     if session.posargs and session.posargs[0] == "run-all" or not session.interactive:
         # run all of the transformers on disnake
         session.log("Running all transformers.")
-        res: str = session.run("python", "-m", "libcst.tool", "list", silent=True)  # type: ignore
+        res: str = session.run(
+            "python",
+            "-m",
+            "libcst.tool",
+            "list",
+            silent=True,
+            env=env,
+        )  # type: ignore
         transformers = [line.split("-")[0].strip() for line in res.splitlines()]
         session.log("Transformers: " + ", ".join(transformers))
 
         for trans in transformers:
             session.run(
-                "python", "-m", "libcst.tool", "codemod", trans, "disnake", "--hide-progress"
+                "python",
+                "-m",
+                "libcst.tool",
+                "codemod",
+                trans,
+                "disnake",
+                "--hide-progress",
+                env=env,
             )
         session.log("Finished running all transformers.")
     else:
@@ -118,9 +133,16 @@ def codemod(session: nox.Session):
                 "libcst.tool",
                 "codemod",
                 *session.posargs,
+                env=env,
             )
         else:
-            session.run("python", "-m", "libcst.tool", "list")
+            session.run(
+                "python",
+                "-m",
+                "libcst.tool",
+                "list",
+                env=env,
+            )
 
 
 @nox.session()