lowlevel: add type hints

Signed-off-by: Benjamin Gilbert <bgilbert@cs.cmu.edu>

Author: bgilbert

.pre-commit-config.yaml

@@ -58,8 +58,8 @@ repos:
     hooks:
       - id: mypy
         name: Check Python types
-        additional_dependencies: [types-setuptools]
-        exclude: "^(doc/.*|openslide/(__init__|deepzoom|lowlevel)\\.py|tests/.*|examples/deepzoom/.*)$"
+        additional_dependencies: [openslide-bin, pillow, types-setuptools]
+        exclude: "^(doc/.*|openslide/(__init__|deepzoom)\\.py|tests/.*|examples/deepzoom/.*)$"
 
   - repo: https://github.com/rstcheck/rstcheck
     rev: v6.2.4