diff --git a/custtypes.py b/custtypes.py
new file mode 100644
index 0000000..7409f48
--- /dev/null
+++ b/custtypes.py
@@ -0,0 +1,9 @@
+"""
+Library of custom type hints.
+"""
+
+from typing import TypeAlias as Neotype
+from pathlib import PurePosixPath, PureWindowsPath, PosixPath, WindowsPath
+
+ExecutedPath: Neotype = Union[PosixPath, WindowsPath]
+IdlePath: Neotype = Union[PurePosixPath, PureWindowsPath]
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