Make providers work with type annotations (#286)

Author: SatwikcoolAgrawal

injector/__init__.py

@@ -1390,7 +1390,7 @@ def provide_strs_also(self) -> List[str]:
 def _mark_provider_function(function: Callable, *, allow_multi: bool) -> None:
     scope_ = getattr(function, '__scope__', None)
     try:
-        annotations = get_type_hints(function)
+        annotations = get_type_hints(function, include_extras=True)
     except NameError:
         return_type = '__deferred__'
     else:

injector_test.py

@@ -2032,3 +2032,19 @@ class MyClass:
     injector = Injector([configure])
     instance = injector.get(MyClass)
     assert instance.foo == 123
+
+
+def test_module_provider_with_annotated():
+    class MyModule(Module):
+        @provider
+        def provide_first(self) -> Annotated[str, 'first']:
+            return 'Bob'
+
+        @provider
+        def provide_second(self) -> Annotated[str, 'second']:
+            return 'Iger'
+
+    module = MyModule()
+    injector = Injector(module)
+    assert injector.get(Annotated[str, 'first']) == 'Bob'
+    assert injector.get(Annotated[str, 'second']) == 'Iger'