model BlockAddedEvent {
  action_type: 'block-added';
  index: number;
}

model BlockRemovedEvent {
  action_type: 'block-removed';
  index: number;
}

model BlockMovedEvent {
  action_type: 'block-moved';
  from_index: number;
  to_index: number;
}

model BlockChangedEvent {
  action_type: 'block-changed';
  index: number;
}

model BlockData<T> {
    id: string;
    tool: string;
    data: T;
}