code: def dvc_add(self, filenames, commit=None):
      self._require("dvc")
      filenames = _coerce_filenames(filenames)
  
      stages = self.dvc.add(filenames)
      if commit:
          self.commit([s.path for s in stages], msg=commit)
      return stages
  
imports: import os
  import pathlib
  import sys
  from contextlib import contextmanager
  from functools import partialmethod
  from dvc.utils import serialize
label_desc: Use image node_id 13 for calling the TmpDir obj's underlying member method code with example usage: obj.dvc_add(filenames, commit) and returns: stages