diff --git a/src/antsibull_core/test.yml b/src/antsibull_core/test.yml
new file mode 100644
index 0000000..e69de29
diff --git a/src/antsibull_core/utils/io.py b/src/antsibull_core/utils/io.py
index 8ec2aa6..6a0d864 100644
--- a/src/antsibull_core/utils/io.py
+++ b/src/antsibull_core/utils/io.py
@@ -7,6 +7,7 @@
 
 import os
 import os.path
+import typing as t
 
 import aiofiles
 
@@ -14,10 +15,15 @@
 from ..logging import log
 
 
+if t.TYPE_CHECKING:
+    # TODO PY3.8: Use __future__.annotations instead of quoting annotations
+    # pylint:disable=unused-import
+    from _typeshed import StrOrBytesPath
+
 mlog = log.fields(mod=__name__)
 
 
-async def copy_file(source_path: str, dest_path: str) -> None:
+async def copy_file(source_path: "StrOrBytesPath", dest_path: "StrOrBytesPath") -> None:
     """
     Copy content from one file to another.
 
@@ -64,7 +70,7 @@ async def copy_file(source_path: str, dest_path: str) -> None:
     flog.debug('Leave')
 
 
-async def write_file(filename: str, content: str) -> None:
+async def write_file(filename: "StrOrBytesPath", content: str) -> None:
     flog = mlog.fields(func='write_file')
     flog.debug('Enter')
 
@@ -93,7 +99,7 @@ async def write_file(filename: str, content: str) -> None:
     flog.debug('Leave')
 
 
-async def read_file(filename: str, encoding: str = 'utf-8') -> str:
+async def read_file(filename: "StrOrBytesPath", encoding: str = 'utf-8') -> str:
     flog = mlog.fields(func='read_file')
     flog.debug('Enter')
 
diff --git a/src/antsibull_core/yaml.py b/src/antsibull_core/yaml.py
index 35099f3..ad22da5 100644
--- a/src/antsibull_core/yaml.py
+++ b/src/antsibull_core/yaml.py
@@ -22,6 +22,11 @@
     from yaml import SafeLoader as _SafeLoader
     from yaml import SafeDumper as _SafeDumper
 
+if t.TYPE_CHECKING:
+    # TODO PY3.8: Use __future__.annotations instead of quoting annotations
+    # pylint:disable=unused-import
+    from _typeshed import StrOrBytesPath
+
 
 def load_yaml_bytes(data: bytes) -> t.Any:
     """
@@ -30,7 +35,7 @@ def load_yaml_bytes(data: bytes) -> t.Any:
     return yaml.load(data, Loader=_SafeLoader)
 
 
-def load_yaml_file(path: str) -> t.Any:
+def load_yaml_file(path: "StrOrBytesPath") -> t.Any:
     """
     Load and parse YAML file ``path``.
     """
@@ -38,7 +43,7 @@ def load_yaml_file(path: str) -> t.Any:
         return yaml.load(stream, Loader=_SafeLoader)
 
 
-def store_yaml_file(path: str, content: t.Any) -> None:
+def store_yaml_file(path: "StrOrBytesPath", content: t.Any) -> None:
     """
     Store ``content`` as YAML file under ``path``.
     """