refactor: simplify init target by removing cache cleanup and adding pre-commit hook (#8590)

* build: add pyyaml dependency

* refactor: simplify init command by removing cache cleaning and langflow run call

* refactor: simplify init target by removing cache cleanup and adding pre-commit hook

* refactor: update langchain_core.prompts import paths to use specific modules

---------

Co-authored-by: Edwin Jose <edwin.jose@datastax.com>

Makefile

@@ -75,12 +75,11 @@ build_frontend: ## build the frontend static files
 	@cp -r src/frontend/build/. src/backend/base/langflow/frontend
 	@echo '==== Frontend build complete ===='
 
-init: check_tools clean_python_cache clean_npm_cache ## initialize the project
+init: check_tools ## initialize the project
 	@make install_backend
 	@make install_frontend
-	@make build_frontend
+	@uvx pre-commit install
 	@echo "$(GREEN)All requirements are installed.$(NC)"
-	@uv run langflow run
 
 ######################
 # CLEAN PROJECT

pyproject.toml

@@ -173,6 +173,7 @@ dev = [
     'elevenlabs>=1.52.0; python_version != "3.12"',
     "faker>=37.0.0",
     "pytest-timeout>=2.3.1",
+    "pyyaml>=6.0.2",
 ]
 
 [tool.uv.sources]

src/backend/base/langflow/schema/message.py

@@ -12,7 +12,8 @@ from uuid import UUID
 from fastapi.encoders import jsonable_encoder
 from langchain_core.load import load
 from langchain_core.messages import AIMessage, BaseMessage, HumanMessage, SystemMessage
-from langchain_core.prompts import BaseChatPromptTemplate, ChatPromptTemplate, PromptTemplate
+from langchain_core.prompts.chat import BaseChatPromptTemplate, ChatPromptTemplate
+from langchain_core.prompts.prompt import PromptTemplate
 from loguru import logger
 from pydantic import BaseModel, ConfigDict, Field, ValidationError, field_serializer, field_validator
 

uv.lock

@@ -4774,6 +4774,7 @@ dev = [
     { name = "pytest-sugar" },
     { name = "pytest-timeout" },
     { name = "pytest-xdist" },
+    { name = "pyyaml" },
     { name = "requests" },
     { name = "respx" },
     { name = "ruff" },
@@ -4946,6 +4947,7 @@ dev = [
     { name = "pytest-sugar", specifier = ">=1.0.0" },
     { name = "pytest-timeout", specifier = ">=2.3.1" },
     { name = "pytest-xdist", specifier = ">=3.6.0" },
+    { name = "pyyaml", specifier = ">=6.0.2" },
     { name = "requests", specifier = ">=2.32.0" },
     { name = "respx", specifier = ">=0.21.1" },
     { name = "ruff", specifier = ">=0.9.7,<0.10" },