fix(types): check with UHI 0.1.2 (#523)

Author: henryiii

.pre-commit-config.yaml

@@ -73,7 +73,7 @@ repos:
   hooks:
   - id: mypy
     files: src
-    additional_dependencies: [numpy==1.20.1]
+    additional_dependencies: [numpy==1.20.1, uhi==0.1.2]
 
 - repo: https://github.com/mgedmin/check-manifest
   rev: "0.46"

src/boost_histogram/_internal/hist.py

@@ -4,6 +4,7 @@
 import warnings
 from os import cpu_count
 from typing import (
+    TYPE_CHECKING,
     Any,
     Callable,
     Dict,
@@ -1013,3 +1014,11 @@ def counts(self, flow: bool = False) -> np.ndarray:
             return view.count  # type: ignore
         else:
             return view.value  # type: ignore
+
+
+if TYPE_CHECKING:
+    import typing
+
+    from uhi.typing.plottable import PlottableHistogram
+
+    _: PlottableHistogram = typing.cast(Histogram, None)