diff --git a/src/dependency_injector/wiring.py b/src/dependency_injector/wiring.py
index f7fd7b61..21b11be5 100644
--- a/src/dependency_injector/wiring.py
+++ b/src/dependency_injector/wiring.py
@@ -91,7 +91,7 @@ Container = Any
 
 class PatchedRegistry:
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._callables: Dict[Callable[..., Any], "PatchedCallable"] = {}
         self._attributes: Set[PatchedAttribute] = set()
 
@@ -110,7 +110,7 @@ class PatchedRegistry:
     def has_callable(self, fn: Callable[..., Any]) -> bool:
         return fn in self._callables
 
-    def register_attribute(self, patched: "PatchedAttribute"):
+    def register_attribute(self, patched: "PatchedAttribute") -> None:
         self._attributes.add(patched)
 
     def get_attributes_from_module(self, module: ModuleType) -> Iterator["PatchedAttribute"]:
@@ -119,7 +119,7 @@ class PatchedRegistry:
                 continue
             yield attribute
 
-    def clear_module_attributes(self, module: ModuleType):
+    def clear_module_attributes(self, module: ModuleType) -> None:
         for attribute in self._attributes.copy():
             if not attribute.is_in_module(module):
                 continue
@@ -143,7 +143,7 @@ class PatchedCallable:
             original: Optional[Callable[..., Any]] = None,
             reference_injections: Optional[Dict[Any, Any]] = None,
             reference_closing: Optional[Dict[Any, Any]] = None,
-    ):
+    ) -> None:
         self.patched = patched
         self.original = original
 
@@ -175,7 +175,7 @@ class PatchedCallable:
 
 class PatchedAttribute:
 
-    def __init__(self, member: Any, name: str, marker: "_Marker"):
+    def __init__(self, member: Any, name: str, marker: "_Marker") -> None:
         self.member = member
         self.name = name
         self.marker = marker
@@ -195,7 +195,7 @@ class ProvidersMap:
 
     CONTAINER_STRING_ID = "<container>"
 
-    def __init__(self, container):
+    def __init__(self, container) -> None:
         self._container = container
         self._map = self._create_providers_map(
             current_container=container,
@@ -629,15 +629,19 @@ def _fetch_modules(package):
     return modules
 
 
-def _is_method(member):
+def _is_method(member) -> bool:
     return inspect.ismethod(member) or inspect.isfunction(member)
 
 
-def _is_marker(member):
+def _is_marker(member) -> bool:
     return isinstance(member, _Marker)
 
 
-def _get_patched(fn, reference_injections, reference_closing):
+def _get_patched(
+        fn: F,
+        reference_injections: Dict[Any, Any],
+        reference_closing: Dict[Any, Any],
+) -> F:
     patched_object = PatchedCallable(
         original=fn,
         reference_injections=reference_injections,
@@ -659,7 +663,7 @@ def _is_fastapi_depends(param: Any) -> bool:
     return fastapi and isinstance(param, fastapi.params.Depends)
 
 
-def _is_patched(fn):
+def _is_patched(fn) -> bool:
     return _patched_registry.has_callable(fn)
 
 
@@ -688,7 +692,7 @@ class Modifier:
 
 class TypeModifier(Modifier):
 
-    def __init__(self, type_: Type):
+    def __init__(self, type_: Type) -> None:
         self.type_ = type_
 
     def modify(
@@ -716,7 +720,7 @@ def as_(type_: Type) -> TypeModifier:
 
 class RequiredModifier(Modifier):
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.type_modifier = None
 
     def as_int(self) -> "RequiredModifier":
@@ -772,7 +776,7 @@ class ProvidedInstance(Modifier):
     TYPE_ITEM = "item"
     TYPE_CALL = "call"
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.segments = []
 
     def __getattr__(self, item):
@@ -857,32 +861,32 @@ class AutoLoader:
     Automatically wire containers when modules are imported.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.containers = []
         self._path_hook = None
 
-    def register_containers(self, *containers):
+    def register_containers(self, *containers) -> None:
         self.containers.extend(containers)
 
         if not self.installed:
             self.install()
 
-    def unregister_containers(self, *containers):
+    def unregister_containers(self, *containers) -> None:
         for container in containers:
             self.containers.remove(container)
 
         if not self.containers:
             self.uninstall()
 
-    def wire_module(self, module):
+    def wire_module(self, module) -> None:
         for container in self.containers:
             container.wire(modules=[module])
 
     @property
-    def installed(self):
+    def installed(self) -> bool:
         return self._path_hook in sys.path_hooks
 
-    def install(self):
+    def install(self) -> None:
         if self.installed:
             return
 
@@ -913,7 +917,7 @@ class AutoLoader:
         sys.path_importer_cache.clear()
         importlib.invalidate_caches()
 
-    def uninstall(self):
+    def uninstall(self) -> None:
         if not self.installed:
             return
 
@@ -958,7 +962,7 @@ from ._cwiring import _async_inject  # noqa
 
 # Wiring uses the following Python wrapper because there is
 # no possibility to compile a first-type citizen coroutine in Cython.
-def _get_async_patched(fn, patched: PatchedCallable):
+def _get_async_patched(fn: F, patched: PatchedCallable) -> F:
     @functools.wraps(fn)
     async def _patched(*args, **kwargs):
         return await _async_inject(