# Copyright 2020 DeepMind Technologies Limited.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Type declaration used in models."""

from typing import Union

from dm_control import mjcf

# Return type of physics.bind()
Binding = Union[mjcf.physics.Binding, mjcf.physics._EmptyBinding]  # pylint: disable=protected-access

# Type of the mjcf elements. This is needed for pytype compatibility because
# mcjf.Element doesn't implement anything and therefor has none of the
# properties that are being access.
MjcfElement = mjcf.element._ElementImpl  # pylint: disable=protected-access
