-record(system, {
    model :: dnd@groups:model(),
    update :: fun((dnd@groups:dnd_msg(), dnd@groups:model(), list(any())) -> {dnd@groups:model(),
        list(any())}),
    drag_events :: fun((integer(), binary()) -> list(lustre@vdom@vattr:attribute(any()))),
    drop_events :: fun((integer(), binary()) -> list(lustre@vdom@vattr:attribute(any()))),
    ghost_styles :: fun((dnd@groups:model()) -> list(lustre@vdom@vattr:attribute(any()))),
    info :: fun((dnd@groups:model()) -> gleam@option:option(dnd@groups:info())),
    update_with_effect :: fun((dnd@groups:dnd_msg(), dnd@groups:model(), list(any())) -> {dnd@groups:model(),
        list(any()),
        lustre@effect:effect(any())}),
    touch_grip_events :: fun((integer(), binary()) -> list(lustre@vdom@vattr:attribute(any()))),
    touch_drop_zone_events :: fun((integer()) -> list(lustre@vdom@vattr:attribute(any()))),
    cancel_events :: fun(() -> list(lustre@vdom@vattr:attribute(any()))),
    is_touch_selecting :: fun((dnd@groups:model()) -> boolean()),
    selected_index :: fun((dnd@groups:model()) -> gleam@option:option(integer())),
    touch_selected_styles :: fun((dnd@groups:model(), integer()) -> list(lustre@vdom@vattr:attribute(any())))
}).