I'm running a script that check a repo for Diff.indexToWorkdir every interval, like so:

   // runs in interval every 1s
    .then(() => {
        return git.Repository.open('../my_repo_path');
    })
    .then( (repo) => {
      return git.Diff.indexToWorkdir(repo);
    })
    .then((repoDiff) => {
        return repoDiff.toBuf(git.Diff.FORMAT.PATCH);
    })

This generates a memory leak.

I know the repository needs to be freed using repo.free(): (or repo.cleanup())
https://www.nodegit.org/api/repository/#free

According to the docs:
https://libgit2.org/libgit2/#HEAD/group/repository/git_repository_free

Note that after a repository is free'd, all the objects it has spawned will still exist until they are manually closed by the user with git_object_free, but accessing any of the attributes of an object without a backing repository will result in undefined behavior

Which means I also need to free up the Diff object;
Apparently there's a way to free a diff using git_diff_free
https://libgit2.org/libgit2/#HEAD/group/diff/git_diff_free

But from what I understand nodegit doesn't expose this function, see:

EDIT
It seems like I also need to free up the Buf I'm creating using repoDiff.toBuf(git.Diff.FORMAT.PATCH);
https://www.nodegit.org/api/buf/#free
https://libgit2.org/libgit2/#HEAD/group/buf/git_buf_free

But I didn't find a way to do this since repoDiff.toBuf return a Promise which returns a string.
It seems the Buf is only available in the C++ implementation. (see NAN_METHOD(GitDiff::ToBuf) )

Is there another way to do this?
Thanks

BTW, I'm guessing this also relates to: #766