code: def _diff(old_pipeline_definition, new_pipeline_definition):
      '''
      Return string diff of pipeline definitions.
      '''
      old_pipeline_definition.pop('ResponseMetadata', None)
      new_pipeline_definition.pop('ResponseMetadata', None)
  
      diff = salt.utils.data.decode(difflib.unified_diff(
          salt.utils.json.dumps(old_pipeline_definition, indent=4).splitlines(True),
          salt.utils.json.dumps(new_pipeline_definition, indent=4).splitlines(True),
      ))
      return ''.join(difff _diff(old_pipeline_definition, new_pipeline_definition):
      '''
      Return string diff of pipeline definitions.
      '''
      old_pipeline_definition.pop('ResponseMetadata', None)
      new_pipeline_definition.pop('ResponseMetadata', None)
  
      diff = salt.utils.data.decode(difflib.unified_diff(
          salt.utils.json.dumps(old_pipeline_definition, indent=4).splitlines(True),
          salt.utils.json.dumps(new_pipeline_definition, indent=4).splitlines(True),
      ))
      return ''.join(diff)
docs: Return string diff of pipeline definitions.