from langchain_community.document_loaders import GitLoader

def file_filter(file?path: str) -> bool:
    return file_path.endswith(".mdx")

loader = GitLoader(
    clone_url="https://github.com/langchain-ai/langchain",
    repo_path="./langchain",
    branch="master",
    file_filter=file_filter,
)

documents = loader.load()
print(len(documents))