feat: Tweak CacheChecker output type (#6719)

* specify cache checker output type

* (de)serialization

* tests

* add default value for type

* reno

* mypy

* feedback

* reduce diff

* reduce diff

* reno

haystack/components/caching/cache_checker.py

@@ -57,7 +57,7 @@ class CacheChecker:
         data["init_parameters"]["document_store"] = docstore
         return default_from_dict(cls, data)
 
-    @component.output_types(hits=List[Document], misses=List[Any])
+    @component.output_types(hits=List[Document], misses=List)
     def run(self, items: List[Any]):
         """
         Checks if any document associated with the specified field is already present in the store. If matching documents

releasenotes/notes/cache_checker_output_type-0b05e75ca41aab61.yaml

@@ -0,0 +1,3 @@
+---
+enhancements:
+  - Modify the output type of `CacheChecker` from `List[Any]` to `List` to make it possible to connect it in a Pipeline.

test/components/caching/test_url_cache_checker.py

@@ -6,7 +6,7 @@ from haystack.document_stores.in_memory import InMemoryDocumentStore
 from haystack.components.caching.cache_checker import CacheChecker
 
 
-class TestUrlCacheChecker:
+class TestCacheChecker:
     def test_to_dict(self):
         mocked_docstore_class = document_store_class("MockedDocumentStore")
         component = CacheChecker(document_store=mocked_docstore_class(), cache_field="url")