fix: mypy complaints about graphlib-backport (closes #35)

pyproject.toml

@@ -30,11 +30,11 @@ requires-python = ">=3.8"
 dependencies = [
   # app => version pinned exactly
 
-  # TODO 2026-10-04 [3.10 EOL]: remove
-  "tomli==2.0.1; python_version < '3.11'",
-
   # TODO 2024-10-31 [3.8 EOL]: remove
   "graphlib_backport==1.1.0; python_version < '3.9'",
+
+  # TODO 2026-10-04 [3.10 EOL]: remove
+  "tomli==2.0.1; python_version < '3.11'",
 ]
 optional-dependencies = { dev = [
   # dev => version latest

src/ds.py

@@ -18,14 +18,19 @@
 from typing import List
 from typing import Mapping
 from typing import Optional
-import graphlib  # type: ignore
 import json
 import os
 import re
 import shlex
 import sys
 import textwrap
 
+# TODO 2024-10-31 [3.8 EOL]: remove conditional
+if sys.version_info >= (3, 9):  # pragma: no cover
+    import graphlib
+else:  # pragma: no cover
+    import graphlib  # type: ignore
+
 
 # TODO 2026-10-04 [3.10 EOL]: remove conditional
 if sys.version_info >= (3, 11):  # pragma: no cover

test/test_parse.py

@@ -2,7 +2,7 @@
 
 # std
 from pathlib import Path
-from graphlib import CycleError  # type: ignore
+import sys
 
 # lib
 import pytest
@@ -15,6 +15,13 @@
 from ds import Task
 
 
+# TODO 2024-10-31 [3.8 EOL]: remove conditional
+if sys.version_info >= (3, 9):  # pragma: no cover
+    from graphlib import CycleError
+else:  # pragma: no cover
+    from graphlib import CycleError  # type: ignore
+
+
 def test_skipped() -> None:
     """Parse configs that are skipped."""
     # tasks that start with a hash (#) are disabled