Add .initializer attribute to Resource provider

docs/main/changelog.rst

@@ -12,6 +12,7 @@ Development version
 - Add ``.provides`` attribute to ``Singleton`` and its subclasses.
   It's a consistency change to make ``Singleton`` match ``Callable``
   and ``Factory`` interfaces.
+- Add ``.initializer`` attribute to ``Resource`` provider.
 - Update string representation of ``Resource`` provider.
 
 4.13.2

src/dependency_injector/providers.pyi

@@ -319,6 +319,8 @@ class Resource(Provider[T]):
     @overload
     def __init__(self, initializer: _Callable[..., T], *args: Injection, **kwargs: Injection) -> None: ...
     @property
+    def initializer(self) -> _Callable[..., Any]: ...
+    @property
     def args(self) -> Tuple[Injection]: ...
     def add_args(self, *args: Injection) -> Resource[T]: ...
     def set_args(self, *args: Injection) -> Resource[T]: ...

src/dependency_injector/providers.pyx

@@ -2999,6 +2999,11 @@ cdef class Resource(Provider):
         """
         return represent_provider(provider=self, provides=self.__initializer)
 
+    @property
+    def initializer(self):
+        """Return initializer."""
+        return self.__initializer
+
     @property
     def args(self):
         """Return positional argument injections."""