def METHOD_NAME(self, runobj: RunObject):
    """
    Return the internal function code.
    """
    task_parameters = runobj.spec.parameters.get("task_parameters", {})
    if "original_handler" in task_parameters:
        original_handler = task_parameters["original_handler"]
    else:
        original_handler = runobj.spec.handler or ""
    encoded_code = (
        self.spec.build.functionSourceCode if hasattr(self.spec, "build") else None
    )
    if not encoded_code:
        return "", original_handler
    decoded_code = b64decode(encoded_code).decode("utf-8")
    code = _databricks_script_code + decoded_code
    if original_handler:
        code += f"\n{original_handler}(**handler_arguments)\n"
    code = b64encode(code.encode("utf-8")).decode("utf-8")
    return code, original_handler