Fix type annotations for .provides (#491)

* Fix type annotations for .provides

* Fix type hinting for .provides

as @rmk135 suggested

src/dependency_injector/providers.pyi

@@ -84,6 +84,7 @@ class Provider(Generic[T]):
 
 class Object(Provider[T]):
     def __init__(self, provides: Optional[T] = None) -> None: ...
+    @property
     def provides(self) -> Optional[T]: ...
     def set_provides(self, provides: Optional[T]) -> Object: ...
 
@@ -144,7 +145,7 @@ class DependenciesContainer(Object):
 class Callable(Provider[T]):
     def __init__(self, provides: Optional[_Callable[..., T]] = None, *args: Injection, **kwargs: Injection) -> None: ...
     @property
-    def provides(self) -> Optional[T]: ...
+    def provides(self) -> Optional[_Callable[..., T]]: ...
     def set_provides(self, provides: Optional[_Callable[..., T]]) -> Callable[T]: ...
     @property
     def args(self) -> Tuple[Injection]: ...
@@ -249,9 +250,9 @@ class Factory(Provider[T]):
     provided_type: Optional[Type]
     def __init__(self, provides: Optional[_Callable[..., T]] = None, *args: Injection, **kwargs: Injection) -> None: ...
     @property
-    def cls(self) -> T: ...
+    def cls(self) -> Type[T]: ...
     @property
-    def provides(self) -> T: ...
+    def provides(self) -> Optional[_Callable[..., T]]: ...
     def set_provides(self, provides: Optional[_Callable[..., T]]) -> Factory[T]: ...
     @property
     def args(self) -> Tuple[Injection]: ...
@@ -300,9 +301,9 @@ class BaseSingleton(Provider[T]):
     provided_type = Optional[Type]
     def __init__(self, provides: Optional[_Callable[..., T]] = None, *args: Injection, **kwargs: Injection) -> None: ...
     @property
-    def cls(self) -> T: ...
+    def cls(self) -> Type[T]: ...
     @property
-    def provides(self) -> T: ...
+    def provides(self) -> Optional[_Callable[..., T]]: ...
     def set_provides(self, provides: Optional[_Callable[..., T]]) -> BaseSingleton[T]: ...
     @property
     def args(self) -> Tuple[Injection]: ...

tests/typing/callable.py

@@ -1,4 +1,4 @@
-from typing import Tuple, Any, Dict
+from typing import Callable, Optional, Tuple, Any, Dict, Type
 
 from dependency_injector import providers
 
@@ -56,3 +56,13 @@ provider9 = providers.Callable(Cat)
 async def _async9() -> None:
     animal1: Animal = await provider9(1, 2, 3, b='1', c=2, e=0.0)  # type: ignore
     animal2: Animal = await provider9.async_(1, 2, 3, b='1', c=2, e=0.0)
+
+# Test 10: to check the .provides
+provider10 = providers.Callable(Cat)
+provides10: Optional[Callable[..., Cat]] = provider10.provides
+assert provides10 is Cat
+
+# Test 11: to check the .provides for explicit typevar
+provider11 = providers.Callable[Animal](Cat)
+provides11: Optional[Callable[..., Animal]] = provider11.provides
+assert provides11 is Cat

tests/typing/delegate.py

@@ -1,5 +1,6 @@
-from dependency_injector import providers
+from typing import Optional
 
+from dependency_injector import providers
 
 # Test 1: to check the return type
 provider1 = providers.Delegate(providers.Provider())
@@ -10,3 +11,7 @@ provider2 = providers.Delegate(providers.Provider())
 async def _async2() -> None:
     var1: providers.Provider = await provider2()  # type: ignore
     var2: providers.Provider = await provider2.async_()
+
+# Test 3: to check class type from provider
+provider3 = providers.Delegate(providers.Provider())
+provided_provides: Optional[providers.Provider] = provider3.provides

tests/typing/factory.py

@@ -1,4 +1,4 @@
-from typing import Tuple, Any, Dict
+from typing import Callable, Optional, Tuple, Any, Dict, Type
 
 from dependency_injector import providers
 
@@ -72,3 +72,17 @@ provider11 = providers.Factory(Cat)
 async def _async11() -> None:
     animal1: Animal = await provider11(1, 2, 3, b='1', c=2, e=0.0)  # type: ignore
     animal2: Animal = await provider11.async_(1, 2, 3, b='1', c=2, e=0.0)
+
+# Test 12: to check class type from .provides
+provider12 = providers.Factory(Cat)
+provided_cls12: Type[Animal] = provider12.cls
+assert issubclass(provided_cls12, Animal)
+provided_provides12: Optional[Callable[..., Animal]] = provider12.provides
+assert provided_provides12 is not None and provided_provides12() == Cat()
+
+# Test 13: to check class from .provides with explicit typevar
+provider13 = providers.Factory[Animal](Cat)
+provided_cls13: Type[Animal] = provider13.cls
+assert issubclass(provided_cls13, Animal)
+provided_provides13: Optional[Callable[..., Animal]] = provider13.provides
+assert provided_provides13 is not None and provided_provides13() == Cat()

tests/typing/object.py

@@ -1,3 +1,5 @@
+from typing import Type, Optional
+
 from dependency_injector import providers
 
 
@@ -17,3 +19,7 @@ provider3 = providers.Object(int(3))
 async def _async3() -> None:
     var1: int = await provider3()  # type: ignore
     var2: int = await provider3.async_()
+
+# Test 4: to check class type from provider
+provider4 = providers.Object(int('1'))
+provided_provides: Optional[int] = provider4.provides

tests/typing/singleton.py

@@ -1,4 +1,4 @@
-from typing import Tuple, Any, Dict
+from typing import Callable, Optional, Tuple, Any, Dict, Type
 
 from dependency_injector import providers
 
@@ -75,3 +75,17 @@ provider13 = providers.Singleton(Cat)
 async def _async13() -> None:
     animal1: Animal = await provider13(1, 2, 3, b='1', c=2, e=0.0)  # type: ignore
     animal2: Animal = await provider13.async_(1, 2, 3, b='1', c=2, e=0.0)
+
+# Test 14: to check class from .provides
+provider14 = providers.Singleton(Cat)
+provided_cls14: Type[Cat] = provider14.cls
+assert issubclass(provided_cls14, Cat)
+provided_provides14: Optional[Callable[..., Cat]] = provider14.provides
+assert provided_provides14 is not None and provided_provides14() == Cat()
+
+# Test 15: to check class from .provides with explicit typevar
+provider15 = providers.Singleton[Animal](Cat)
+provided_cls15: Type[Animal] = provider15.cls
+assert issubclass(provided_cls15, Animal)
+provided_provides15: Optional[Callable[..., Animal]] = provider15.provides
+assert provided_provides15 is not None and provided_provides15() == Cat()