Update mypy configuration to include namespace packages

Makefile

@@ -32,7 +32,7 @@ format:
 
 lint:
 	make install_backend
-	poetry run mypy src/backend
+	poetry run mypy --namespace-packages -p "langflow"
 	poetry run ruff . --fix
 
 install_frontend:

src/backend/base/pyproject.toml

@@ -17,10 +17,11 @@ repository = "https://github.com/logspace-ai/langflow"
 license = "MIT"
 readme = "README.md"
 keywords = ["nlp", "langchain", "openai", "gpt", "gui"]
-packages = [{ include = "langflow" }]
+packages = [{ include = "langflow" }, { include = "py.typed" }]
 include = ["pyproject.toml", "README.md", "langflow/**/*"]
 documentation = "https://docs.langflow.org"
 
+
 [tool.poetry.scripts]
 langflow-base = "langflow.__main__:main"
 
@@ -106,6 +107,11 @@ filterwarnings = ["ignore::DeprecationWarning"]
 log_cli = true
 markers = ["async_test"]
 
+[tool.mypy]
+namespace_packages = true
+mypy_path = "langflow"
+ignore_missing_imports = true
+
 
 [tool.ruff]
 exclude = ["src/backend/langflow/alembic/*"]