def copyFrom(path_to_copy_from: str):
    """This built-in function returns the value of 'path_to_copy_from' key.
    """

    def transform_function(current_value: object, record: dict, complete_transform_schema: dict,
                           custom_variables: dict):
        composed_key = (path_to_copy_from,)
        return record.get(composed_key, None)

    return transform_function