refactor: Add 'Retriever' type alias to field_typing/constants.py

src/backend/base/langflow/field_typing/__init__.py

@@ -25,6 +25,7 @@ from .constants import (
     TextSplitter,
     Tool,
     VectorStore,
+    Retriever,
 )
 from .range_spec import RangeSpec
 
@@ -82,4 +83,5 @@ __all__ = [
     "Tool",
     "VectorStore",
     "BaseChatModel",
+    "Retriever",
 ]

src/backend/base/langflow/field_typing/constants.py

@@ -1,5 +1,5 @@
-from typing import Callable, Dict, Text, Union
-from langchain_core.language_models.chat_models import BaseChatModel
+from typing import Callable, Dict, Text, TypeAlias, Union
+
 from langchain.agents.agent import AgentExecutor
 from langchain.chains.base import Chain
 from langchain.memory.chat_memory import BaseChatMemory
@@ -7,6 +7,7 @@ from langchain_core.document_loaders import BaseLoader
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
 from langchain_core.language_models import BaseLanguageModel, BaseLLM
+from langchain_core.language_models.chat_models import BaseChatModel
 from langchain_core.memory import BaseMemory
 from langchain_core.output_parsers import BaseOutputParser
 from langchain_core.prompts import BasePromptTemplate, ChatPromptTemplate, PromptTemplate
@@ -16,8 +17,9 @@ from langchain_core.vectorstores import VectorStore
 from langchain_text_splitters import TextSplitter
 
 
-NestedDict = Dict[str, Union[str, Dict]]
-LanguageModel = Union[BaseLanguageModel, BaseLLM, BaseChatModel]
+NestedDict: TypeAlias = Dict[str, Union[str, Dict]]
+LanguageModel: TypeAlias = Union[BaseLanguageModel, BaseLLM, BaseChatModel]
+Retriever: TypeAlias = BaseRetriever
 
 
 class Object:
@@ -61,4 +63,5 @@ CUSTOM_COMPONENT_SUPPORTED_TYPES = {
     "Object": Object,
     "Callable": Callable,
     "LanguageModel": LanguageModel,
+    "Retriever": Retriever,
 }