🔧 fix(utils.py): import CustomComponent class and add import_custom_component function

🔧 fix(types.py): process field_type to convert "Prompt" to "prompt"
The `utils.py` file was missing an import statement for the `CustomComponent` class from the `langflow.interface.custom.custom` module. This import statement has been added to the top of the file. Additionally, a new function `import_custom_component` has been added to import a custom component based on its name.

In the `types.py` file, a new function `process_type` has been added to convert the field_type "Prompt" to "prompt". This is done to ensure consistency in the field types used throughout the codebase.

src/backend/langflow/interface/importing/utils.py

@@ -9,6 +9,7 @@ from langchain.base_language import BaseLanguageModel
 from langchain.chains.base import Chain
 from langchain.chat_models.base import BaseChatModel
 from langchain.tools import BaseTool
+from langflow.interface.custom.custom import CustomComponent
 from langflow.utils import validate
 
 
@@ -46,6 +47,7 @@ def import_by_type(_type: str, name: str) -> Any:
         "utilities": import_utility,
         "output_parsers": import_output_parser,
         "retrievers": import_retriever,
+        "custom_components": import_custom_component,
     }
     if _type == "llms":
         key = "chat" if "chat" in name.lower() else "llm"
@@ -56,6 +58,11 @@ def import_by_type(_type: str, name: str) -> Any:
     return loaded_func(name)
 
 
+def import_custom_component(custom_component: str) -> CustomComponent:
+    """Import custom component from custom component name"""
+    return import_class(f"langflow.interface.custom.custom.{custom_component}")
+
+
 def import_output_parser(output_parser: str) -> Any:
     """Import output parser from output parser name"""
     return import_module(f"from langchain.output_parsers import {output_parser}")

src/backend/langflow/interface/types.py

@@ -72,6 +72,10 @@ def build_langchain_types_dict():  # sourcery skip: dict-assign-update-to-union
     return all_types
 
 
+def process_type(field_type: str):
+    return "prompt" if field_type == "Prompt" else field_type
+
+
 # TODO: Move to correct place
 def add_new_custom_field(
     template, field_name: str, field_type: str, field_config: dict
@@ -80,6 +84,8 @@ def add_new_custom_field(
     # if it is, update the value
     name = field_config.pop("name", field_name)
     field_type = field_config.pop("field_type", field_type)
+    field_type = process_type(field_type)
+
     required = field_config.pop("required", True)
     placeholder = field_config.pop("placeholder", "")