def add(mode_id: str) -> list:
    """
    Adds the specified mode identifier to the list of active modes and returns
    a copy of the currently active modes list.
    """

    if not has(mode_id):
        _current_modes.append(mode_id)
    return _current_modes.copy()
def add ( mode_id : str ) -> list : if not has ( mode_id ) : _current_modes . append ( mode_id ) return _current_modes . copy ( )
Adds the specified mode identifier to the list of active modes and returns
    a copy of the currently active modes list.